Additional XML Security Uniform Resource Identifiers (URIs)
draft-eastlake-rfc6931bis-xmlsec-uris-22
| Document | Type | Active Internet-Draft (individual) | |
|---|---|---|---|
| Author | Donald Eastlake | ||
| Last updated | 2022-01-19 (latest revision 2022-01-18) | ||
| Stream | Internet Engineering Task Force (IETF) | ||
| Intended RFC status | Proposed Standard | ||
| Formats | plain text htmlized pdfized bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | IESG Evaluation | |
| Action Holders | |||
| Consensus Boilerplate | Yes | ||
| Telechat date |
On agenda of 2022-01-20 IESG telechat
Has a DISCUSS. Has enough positions to pass once DISCUSS positions are resolved. |
||
| Responsible AD | Roman Danyliw | ||
| Send notices to | (None) | ||
| IANA | IANA review state | IANA - Not OK | |
| IANA expert review state | Issues identified | ||
| IANA expert review comments | Expert response: I reviewed changed in this draft in comparison to RFC 6931 and they mostly look fine to me. (I am generally happy with how errata was addressed and what kind of algorithms were added.) I have concerns/questions about one of the section, which I quote below: Hide quoted text > 2.2.6 XMSS and XMSSMT > > Identifiers: > http://www.w3.org/2021/04/xmldsig-more#xmss-sha2-192 > http://www.w3.org/2021/04/xmldsig-more#xmss-sha2-256 > http://www.w3.org/2021/04/xmldsig-more#xmss-shake256-192 > http://www.w3.org/2021/04/xmldsig-more#xmss-shake256-256 > http://www.w3.org/2021/04/xmldsig-more#xmssmt-sha2-192 > http://www.w3.org/2021/04/xmldsig-more#xmssmt-sha2-256 > http://www.w3.org/2021/04/xmldsig-more#xmssmt-shake256-192 > http://www.w3.org/2021/04/xmldsig-more#xmssmt-shake256-256 I might got this completely wrong, but looking at the IANA registry <https://www.iana.org/assignments/xmss-extended-hash-based-signatures/xmss-extended-hash-based-signatures.xhtml#xmss-signatures> and NIST800-208 document itself I see that it is using identifiers in the form XMSS-SHA2_h_256, where "h" is one of 10/16/20. (There is a similar problem with xmssmt). I am wondering why "h" is not included in the fragment part, as it seems like an important parameter for XMSS/XMSSMT. Or possibly it should be included as an XML element, similar to <Salt>? | ||
INTERNET-DRAFT D. Eastlake
Obsoletes: 6931 Futurewei Technologies
Intended Status: Proposed Standard
Expires: July 17, 2022 January 18, 2022
Additional XML Security Uniform Resource Identifiers (URIs)
<draft-eastlake-rfc6931bis-xmlsec-uris-22.txt>
Abstract
This document updates and corrects the IANA "XML Security URIs"
registry that lists URIs intended for use with XML digital
signatures, encryption, canonicalization, and key management. These
URIs identify algorithms and types of information. This document
also updates, corrects three errata against, and obsoletes RFC 6931.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Distribution of this document is unlimited. Comments should be sent
to the author.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at
https://www.ietf.org/1id-abstracts.html. The list of Internet-Draft
Shadow Directories can be accessed at
https://www.ietf.org/shadow.html.
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Table of Contents
1. Introduction............................................4
1.1 Terminology...........................................5
1.2 Acronyms..............................................5
2. Algorithms..............................................7
2.1 DigestMethod (Hash) Algorithms........................7
2.1.1 MD5.................................................8
2.1.2 SHA-224.............................................8
2.1.3 SHA-384.............................................8
2.1.4 Whirlpool...........................................9
2.1.5 SHA3 Algorithms.....................................9
2.2 SignatureMethod MAC Algorithms........................9
2.2.1 HMAC-MD5...........................................10
2.2.2 HMAC SHA Variations................................10
2.2.3 HMAC-RIPEMD160.....................................11
2.2.4 Poly1305...........................................11
2.2.5 SipHash-2-4........................................11
2.2.6 XMSS and XMSSMT....................................12
2.3 SignatureMethod Public Key Signature Algorithms......12
2.3.1 RSA-MD5............................................12
2.3.2 RSA-SHA256.........................................13
2.3.3 RSA-SHA384.........................................14
2.3.4 RSA-SHA512.........................................14
2.3.5 RSA-RIPEMD160......................................14
2.3.6 ECDSA-SHA*, ECDSA-RIPEMD160, ECDSA-Whirlpool.......15
2.3.7 ESIGN-SHA*.........................................15
2.3.8 RSA-Whirlpool......................................16
2.3.9 RSASSA-PSS with Parameters.........................16
2.3.10 RSASSA-PSS without Parameters.....................18
2.3.11 RSA-SHA224........................................18
2.3.12 Edwards-Curve.....................................19
2.4 Minimal Canonicalization.............................20
2.5 Transform Algorithms.................................20
2.5.1 XPointer...........................................20
2.6 EncryptionMethod Algorithms..........................21
2.6.1 ARCFOUR Encryption Algorithm.......................21
2.6.2 Camellia Block Encryption..........................21
2.6.3 Camellia Key Wrap..................................22
2.6.4 PSEC-KEM, RSAES-KEM, and ECIES-KEM.................22
2.6.5 SEED Block Encryption..............................23
2.6.6 SEED Key Wrap......................................23
2.6.7 ChaCha20...........................................24
2.6.8 ChaCha20+Poly1305..................................24
2.7 Key AgreementMethod Algorithms.......................25
2.7.1 X25519 Key Agreement...............................25
2.7.2 HKDF Key Derivation................................25
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Table of Contents (continued)
3. KeyInfo................................................27
3.1 PKCS #7 Bag of Certificates and CRLs.................27
3.2 Additional RetrievalMethod Type Values...............27
4. Indexes................................................28
4.1 Index by Fragment Index..............................28
4.2 Index by URI.........................................32
5. Allocation Considerations..............................36
5.1 W3C Allocation Considerations........................36
5.2 IANA Considerations..................................36
6. Security Considerations................................38
Acknowledgements..........................................39
Appendix A: Changes from [RFC6931]........................40
Appendix B: Bad URIs......................................41
Appendix Z: Change History................................42
Normative References......................................44
Informational References..................................47
Author's Address..........................................50
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1. Introduction
XML digital signatures, canonicalization, and encryption were
standardized by the W3C and by the joint IETF/W3C XMLDSIG working
group [W3C] [XMLSEC]. These are now W3C Recommendations and some are
also RFCs. They are available as follows:
RFC
Status W3C REC Topic
----------- ------- -----
[RFC3275] [XMLDSIG10] XML Digital Signatures
Draft Standard
[RFC3076] [CANON10] Canonical XML
Informational
- - - - - - [XMLENC10] XML Encryption 1.0
[RFC3741] [XCANON] Exclusive XML Canonicalization 1.0
Informational
These documents and recommendations use URIs [RFC3986] to identify
algorithms and keying information types. The W3C has subsequently
produced updated XML Signature 1.1 [XMLDSIG11], Canonical XML 1.1
[CANON11], and XML Encryption 1.1 [XMLENC11] versions, as well as a
new XML Signature Properties specification [XMLDSIG-PROP].
In addition, the XML Encryption recommendation has been augmented by
[GENERIC] which defines algorithms, XML types, and elements necessary
to use generic hybrid ciphers in XML Security applications. [GENERIC]
also provides a key encapsulation algorithm and a data encapsulation
algorithm (see Section 2.6.4).
All camel-case element names (names with both interior upper and
lower case letters) herein, such as DigestValue, are from these
documents.
This document is an updated convenient reference list of URIs and
corresponding algorithms in which there is expressed interest. This
document fixes Errata [Err3597], [Err3965], [Err4004] against and
obsoletes [RFC6931].
All of the URIs for algorithms and data types herein are listed in
the indexes in Section 4. Of these URIs, those that were added by
earlier RFCs or by this document have a subsection in Section 2 or 3.
A few URIs defined elsewhere also have a subsection in Section 2 or 3
but most such URIs do not. For example, use of SHA-256 as defined in
[XMLENC11] has no subsection here but is included in the indexes in
Section 4.
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Specification in this document of the URI representing an algorithm
does not imply endorsement of the algorithm for any particular
purpose. A protocol specification, which this is not, generally
gives algorithm and implementation requirements for the protocol.
Security considerations for algorithms are constantly evolving, as
documented elsewhere. This specification simply provides some URIs
and relevant formatting when those URIs are used.
This document is not intended to change the algorithm implementation
requirements of any IETF or W3C document. Use of [RFC2119]/[RFC8174]
terminology is intended to be only such as is already stated or
implied by other authoritative documents.
Progressing XML Digital Signature [RFC3275] along the Standards Track
required removal of any algorithms from the original version
[RFC3075] for which there was not demonstrated interoperability.
This required removal of the Minimal Canonicalization algorithm, in
which there was continued interest. The URI for Minimal
Canonicalization was included in [RFC6931] and is included here.
1.1 Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
"camel-case" refers to terms that are mostly lower case but have
internal capital letters.
1.2 Acronyms
The following acronyms are used in this document:
AAD - Additional Authenticated Data
AEAD - Authenticated Encryption with Additional Data
HMAC - Keyed-Hashing MAC [RFC2104]
IETF - Internet Engineering Task Force <https://www.ietf.org>
MAC - Message Authentication Code
MD - Message Digest
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NIST - United States National Institute of Standards and
Technology <https://www.nist.gov>
RC - Rivest Cipher
RSA - Rivest, Shamir, and Adleman
SHA - Secure Hash Algorithm
URI - Uniform Resource Identifier [RFC3986]
W3C - World Wide Web Consortium <https://www.w3.org>
XML - eXtensible Markup Language
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2. Algorithms
The URI [RFC3986] that was dropped from the XML Digital Signature
standard due to the transition from Proposed Standard to Draft
Standard [RFC3275] is included in Section 2.4 below with its original
http://www.w3.org/2000/09/xmldsig#
prefix so as to avoid changing the XMLDSIG standard's namespace.
Additional algorithms in RFC 4051 were given URIs that start with
http://www.w3.org/2001/04/xmldsig-more#
further algorithms added in [RFC6931] were given URIs that start with
http://www.w3.org/2007/05/xmldsig-more#
and algorithms added in this document are given URIs that start with
http://www.w3.org/2021/04/xmldsig-more#
In addition, for ease of reference, this document includes in the
indexes in Section 4 many cryptographic algorithm URIs from XML
security documents using the namespaces with which they are defined
in those documents as follows:
http://www.w3.org/2000/09/xmldsig#
for some URIs specified in [RFC3275],
http://www.w3.org/2001/04/xmlenc#
for some URIs specified in [XMLENC10], and
http://www.w3/org/xmlsec-ghc#
for some URIs specified in [GENERIC].
See also [XMLSECXREF].
2.1 DigestMethod (Hash) Algorithms
These algorithms are usable wherever a DigestMethod element occurs.
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2.1.1 MD5
Identifier:
http://www.w3.org/2001/04/xmldsig-more#md5
The MD5 algorithm [RFC1321] takes no explicit parameters. An example
of an MD5 DigestAlgorithm element is:
<DigestAlgorithm
Algorithm="http://www.w3.org/2001/04/xmldsig-more#md5"/>
An MD5 digest is a 128-bit string. The content of the DigestValue
element SHALL be the base64 [RFC2045] encoding of this bit string
viewed as a 16-octet stream. See [RFC6151] for MD5 security
considerations.
2.1.2 SHA-224
Identifier:
http://www.w3.org/2001/04/xmldsig-more#sha224
The SHA-224 algorithm [FIPS180-4] [RFC6234] takes no explicit
parameters. An example of a SHA-224 DigestAlgorithm element is:
<DigestAlgorithm
Algorithm="http://www.w3.org/2001/04/xmldsig-more#sha224" />
A SHA-224 digest is a 224-bit string. The content of the DigestValue
element SHALL be the base64 [RFC2045] encoding of this string viewed
as a 28-octet stream.
2.1.3 SHA-384
Identifier:
http://www.w3.org/2001/04/xmldsig-more#sha384
The SHA-384 algorithm [FIPS180-4] takes no explicit parameters. An
example of a SHA-384 DigestAlgorithm element is:
<DigestAlgorithm
Algorithm="http://www.w3.org/2001/04/xmldsig-more#sha384" />
A SHA-384 digest is a 384-bit string. The content of the DigestValue
element SHALL be the base64 [RFC2045] encoding of this string viewed
as a 48-octet stream.
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2.1.4 Whirlpool
Identifier:
http://www.w3.org/2007/05/xmldsig-more#whirlpool
The Whirlpool algorithm [10118-3] takes no explicit parameters. An
example of a Whirlpool DigestAlgorithm element is:
<DigestAlgorithm
Algorithm="http://www.w3.org/2007/05/xmldsig-more#whirlpool" />
A Whirlpool digest is a 512-bit string. The content of the
DigestValue element SHALL be the base64 [RFC2045] encoding of this
string viewed as a 64-octet stream.
2.1.5 SHA3 Algorithms
Identifiers:
http://www.w3.org/2007/05/xmldsig-more#sha3-224
http://www.w3.org/2007/05/xmldsig-more#sha3-256
http://www.w3.org/2007/05/xmldsig-more#sha3-384
http://www.w3.org/2007/05/xmldsig-more#sha3-512
NIST conducted a hash function competition for an alternative to the
SHA family. The Keccak-f[1600] algorithm was selected [Keccak].
This hash function is commonly referred to as "SHA-3" [FIPS202].
A SHA-3 224, 256, 384, and 512 digest is a 224-, 256-, 384-, and
512-bit string, respectively. The content of the DigestValue element
SHALL be the base64 [RFC2045] encoding of this string viewed as a
28-, 32-, 48-, and 64-octet stream, respectively. An example of a
SHA3-224 DigestAlgorithm element is:
<DigestAlgorithm
Algorithm="http://www.w3.org/2007/05/xmldsig-more#sha3-224" />
2.2 SignatureMethod MAC Algorithms
This section covers SignatureMethod MAC (Message Authentication Code)
Algorithms.
Note: Some text in this section is duplicated from [RFC3275] for the
convenience of the reader. [RFC3275] is normative in case of
conflict.
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2.2.1 HMAC-MD5
Identifier:
http://www.w3.org/2001/04/xmldsig-more#hmac-md5
The HMAC algorithm [RFC2104] takes the truncation length in bits as a
parameter; if the parameter is not specified, then all the bits of
the hash are output. An example of an HMAC-MD5 SignatureMethod
element is as follows:
<SignatureMethod
Algorithm="http://www.w3.org/2001/04/xmldsig-more#hmac-md5">
<HMACOutputLength>112</HMACOutputLength>
</SignatureMethod>
The output of the HMAC algorithm is the output (possibly truncated)
of the chosen digest algorithm. This value SHALL be base64 [RFC2045]
encoded in the same straightforward fashion as the output of the
digest algorithms. Example: the SignatureValue element for the HMAC-
MD5 digest
9294727A 3638BB1C 13F48EF8 158BFC9D
from the test vectors in [RFC2104] would be
kpRyejY4uxwT9I74FYv8nQ==
Schema Definition:
<simpleType name="HMACOutputLength">
<restriction base="integer"/>
</simpleType>
DTD:
<!ELEMENT HMACOutputLength (#PCDATA) >
The Schema Definition and DTD immediately above are copied from
[RFC3275].
See [RFC6151] for HMAC-MD5 security considerations.
2.2.2 HMAC SHA Variations
Identifiers:
http://www.w3.org/2001/04/xmldsig-more#hmac-sha224
http://www.w3.org/2001/04/xmldsig-more#hmac-sha256
http://www.w3.org/2001/04/xmldsig-more#hmac-sha384
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http://www.w3.org/2001/04/xmldsig-more#hmac-sha512
SHA-224, SHA-256, SHA-384, and SHA-512 [FIPS180-4] [RFC6234] can also
be used in HMAC as described in Section 2.2.1 above for HMAC-MD5.
2.2.3 HMAC-RIPEMD160
Identifier:
http://www.w3.org/2001/04/xmldsig-more#hmac-ripemd160
RIPEMD-160 [10118-3] is a 160-bit hash that is used here in HMAC.
It's output can be optionally truncated. An example is as follows:
<SignatureMethod
Algorithm="http://www.w3.org/2001/04/xmldsig-more#hmac-ripemd160">
<HMACOutputLength>144</HMACOutputLength>
</SignatureMethod>
2.2.4 Poly1305
Identifier:
http://www.w3.org/2021/04/xmldsig-more#poly1305
Poly1305 [RFC8439] [Poly1305] is a high-speed message authentication
code algorithm. It takes a 32-octet one-time key and a message and
produces a 16-octet tag which is used to authenticate the message. An
example of a Poly1305 SigntureMethod element is as follows:
<SignatureMethod
Algorithm="http://www.w3.org/2021/04/xmldsig-more#poly1305"/>
2.2.5 SipHash-2-4
Identifier:
http://www.w3.org/2021/04/xmldsig-more#siphash-2-4
SipHash [SipHash1] [SipHash2] computes a 64-bit MAC from a 128-bit
secret key and a variable length message. An example of a SipHash-2-4
SigntureMethod element is as follows:
<SignatureMethod
Algorithm="http://www.w3.org/2021/04/xmldsig-more#siphash-2-4"/>
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2.2.6 XMSS and XMSSMT
Identifiers:
http://www.w3.org/2021/04/xmldsig-more#xmss-sha2-192
http://www.w3.org/2021/04/xmldsig-more#xmss-sha2-256
http://www.w3.org/2021/04/xmldsig-more#xmss-shake256-192
http://www.w3.org/2021/04/xmldsig-more#xmss-shake256-256
http://www.w3.org/2021/04/xmldsig-more#xmssmt-sha2-192
http://www.w3.org/2021/04/xmldsig-more#xmssmt-sha2-256
http://www.w3.org/2021/04/xmldsig-more#xmssmt-shake256-192
http://www.w3.org/2021/04/xmldsig-more#xmssmt-shake256-256
XMSS (eXtended Merkle Signature Scheme) and XMSSMT (XMSS Multi-Tree)
are stateful hash-based signature schemes [NIST800-208]. According to
NIST, it is believed that the security of these schemes depends only
on the security of the underlying hash functions -- in particular the
infeasibility of finding a preimage or a second preimage -- and it is
believed that the security of these hash functions will not be broken
by the development of large-scale quantum computers.
The hash function used in these signature schemes is SHA-256
[RFC6234] or the SHAKE256 extensible output function [FIPS202] as
indicated by the middle token of the URI extension. Their output is
192 or 256 bits as indicated by the final token of the URI extension.
For further information on the intended usage of these signature
schemes and the careful state management required to maintain their
strength, see [NIST800-208].
An example of an XMSS DigestAlgorithm element is:
<DigestAlgorithm
Algorithm="http://www.w3.org/2021/04/xmldsig-more#xmss-sha2-192"
/>
2.3 SignatureMethod Public Key Signature Algorithms
These algorithms are distinguished from those in Section 2.2 above in
that they use public key methods. That is to say, the verification
key is different from and not feasibly derivable from the signing
key.
2.3.1 RSA-MD5
Identifier:
http://www.w3.org/2001/04/xmldsig-more#rsa-md5
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This implies the PKCS#1 v1.5 padding algorithm described in
[RFC8017]. An example of use is:
<SignatureMethod
Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-md5" />
The SignatureValue content for an RSA-MD5 signature is the base64
[RFC2045] encoding of the octet string computed as per [RFC8017],
Section 8.2.1, signature generation for the RSASSA-PKCS1-v1_5
signature scheme. As specified in the EMSA-PKCS1-V1_5-ENCODE function
in [RFC8017], Section 9.2, the value input to the signature function
MUST contain a prepended algorithm object identifier for the hash
function, but the availability of an ASN.1 parser and recognition of
OIDs is not required of a signature verifier. The PKCS#1 v1.5
representation appears as:
CRYPT (PAD (ASN.1 (OID, DIGEST (data))))
The padded ASN.1 will be of the following form:
01 | FF* | 00 | prefix | hash
Vertical bar ("|") represents concatenation. "01", "FF", and "00" are
fixed octets of the corresponding hexadecimal value, and the asterisk
("*") after "FF" indicates repetition. "hash" is the MD5 digest of
the data. "prefix" is the ASN.1 BER MD5 algorithm designator prefix
required in PKCS #1 [RFC8017], that is,
hex 30 20 30 0c 06 08 2a 86 48 86 f7 0d 02 05 05 00 04 10
This prefix is included to make it easier to use standard
cryptographic libraries. The FF octet MUST be repeated enough times
that the value of the quantity being CRYPTed is exactly one octet
shorter than the RSA modulus.
See [RFC6151] for MD5 security considerations.
2.3.2 RSA-SHA256
Identifier:
http://www.w3.org/2001/04/xmldsig-more#rsa-sha256
This implies the PKCS#1 v1.5 padding algorithm [RFC8017] as described
in Section 2.3.1, but with the ASN.1 BER SHA-256 algorithm designator
prefix. An example of use is:
<SignatureMethod
Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256" />
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2.3.3 RSA-SHA384
Identifier:
http://www.w3.org/2001/04/xmldsig-more#rsa-sha384
This implies the PKCS#1 v1.5 padding algorithm [RFC8017] as described
in Section 2.3.1, but with the ASN.1 BER SHA-384 algorithm designator
prefix. An example of use is:
<SignatureMethod
Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha384" />
Because it takes about the same effort to calculate a SHA-384 message
digest as it does a SHA-512 message digest, it is suggested that RSA-
SHA512 be used in preference to RSA-SHA384 where possible.
2.3.4 RSA-SHA512
Identifier:
http://www.w3.org/2001/04/xmldsig-more#rsa-sha512
This implies the PKCS#1 v1.5 padding algorithm [RFC8017] as described
in Section 2.3.1, but with the ASN.1 BER SHA-512 algorithm designator
prefix. An example of use is:
<SignatureMethod
Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha512" />
2.3.5 RSA-RIPEMD160
Identifier:
http://www.w3.org/2001/04/xmldsig-more#rsa-ripemd160
This implies the PKCS#1 v1.5 padding algorithm [RFC8017] as described
in Section 2.3.1, but with the ASN.1 BER RIPEMD160 algorithm
designator prefix. An example of use is:
<SignatureMethod
Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-ripemd160"
/>
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2.3.6 ECDSA-SHA*, ECDSA-RIPEMD160, ECDSA-Whirlpool
Identifiers:
http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha1
http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha224
http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha256
http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha384
http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha512
http://www.w3.org/2021/04/xmldsig-more#ecdsa-sha3-224
http://www.w3.org/2021/04/xmldsig-more#ecdsa-sha3-256
http://www.w3.org/2021/04/xmldsig-more#ecdsa-sha3-384
http://www.w3.org/2021/04/xmldsig-more#ecdsa-sha3-512
http://www.w3.org/2007/05/xmldsig-more#ecdsa-ripemd160
http://www.w3.org/2007/05/xmldsig-more#ecdsa-whirlpool
The Elliptic Curve Digital Signature Algorithm (ECDSA) [FIPS186-4] is
the elliptic curve analogue of the Digital Signature Algorithm (DSA)
signature method, i.e., the Digital Signature Standard (DSS). It
takes no explicit parameters. For some detailed specifications of how
to use it with SHA hash functions and XML Digital Signature, please
see [X9.62] and [RFC4050]. The #sha3-*, #ecdsa-ripemd160, and
#ecdsa-whirlpool fragments identify a signature method processed in
the same way as specified by the #ecdsa-sha1 fragment, with the
exception that SHA3 (see Section 2.1.5), RIPEMD160, or Whirlpool (see
Section 2.1.4) is used instead of SHA-1.
The output of the ECDSA algorithm consists of a pair of integers
usually referred to by the pair (r, s). The signature value consists
of the base64 encoding of the concatenation of two octet streams that
respectively result from the octet encoding of the values r and s in
that order. Conversion from integer to octet-stream must be done
according to the I2OSP operation defined in the [RFC8017]
specification with the l parameter equal to the size of the base
point order of the curve in octets (e.g., 32 for the P-256 curve and
66 for the P-521 curve [FIPS186-4]).
For an introduction to elliptic curve cryptographic algorithms, see
[RFC6090] and note the errata (Errata ID 2773-2777).
2.3.7 ESIGN-SHA*
Identifiers:
http://www.w3.org/2001/04/xmldsig-more#esign-sha1
http://www.w3.org/2001/04/xmldsig-more#esign-sha224
http://www.w3.org/2001/04/xmldsig-more#esign-sha256
http://www.w3.org/2001/04/xmldsig-more#esign-sha384
http://www.w3.org/2001/04/xmldsig-more#esign-sha512
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The ESIGN algorithm specified in [IEEEP1363a] is a signature scheme
based on the integer factorization problem. It is much faster than
previous digital signature schemes, so ESIGN can be implemented on
smart cards without special co-processors.
An example of use is:
<SignatureMethod
Algorithm="http://www.w3.org/2001/04/xmldsig-more#esign-sha1"
/>
2.3.8 RSA-Whirlpool
Identifier:
http://www.w3.org/2007/05/xmldsig-more#rsa-whirlpool
As in the definition of the RSA-SHA1 algorithm in [XMLDSIG11], the
designator "RSA" means the RSASSA-PKCS1-v1_5 algorithm as defined in
[RFC8017]. When identified through the #rsa-whirlpool fragment
identifier, Whirlpool is used as the hash algorithm instead. Use of
the ASN.1 BER Whirlpool algorithm designator is implied. That
designator is:
hex 30 4e 30 0a 06 06 28 cf 06 03 00 37 05 00 04 40
as an explicit octet sequence. This corresponds to OID
1.0.10118.3.0.55 defined in [10118-3].
An example of use is:
<SignatureMethod
Algorithm="http://www.w3.org/2007/05/xmldsig-more#rsa-whirlpool"
/>
2.3.9 RSASSA-PSS with Parameters
Identifiers:
http://www.w3.org/2007/05/xmldsig-more#rsa-pss
http://www.w3.org/2007/05/xmldsig-more#MGF1
These identifiers use the PKCS#1 EMSA-PSS encoding algorithm
[RFC8017]. The RSASSA-PSS algorithm takes the digest method (hash
function), a mask generation function, the salt length in octets
(SaltLength), and the trailer field as explicit parameters.
Algorithm identifiers for hash functions specified in XML encryption
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[XMLENC11] [XMLDSIG11] and in Section 2.1 are considered to be valid
algorithm identifiers for hash functions. According to [RFC8017],
the default value for the digest function is SHA-1, but due to the
discovered weakness of SHA-1 [RFC6194], it is recommended that
SHA-256 or a stronger hash function be used. Notwithstanding
[RFC8017], SHA-256 is the default to be used with these
SignatureMethod identifiers if no hash function has been specified.
The default salt length for these SignatureMethod identifiers, if the
SaltLength is not specified, SHALL be the number of octets in the
hash value of the digest method, as recommended in [RFC4055]. In a
parameterized RSASSA-PSS signature the ds:DigestMethod and the
SaltLength parameters usually appear. If they do not, the defaults
make this equivalent to http://www.w3.org/2007/05/xmldsig-
more#sha256-rsa-MGF1 (see Section 2.3.10). The TrailerField defaults
to 1 (0xBC) when omitted.
Schema Definition (target namespace
http://www.w3.org/2007/05/xmldsig-more#):
<xs:element name="RSAPSSParams" type="pss:RSAPSSParamsType">
<xs:annotation>
<xs:documentation>
Top level element that can be used in xs:any namespace="#other"
wildcard of ds:SignatureMethod content.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:complexType name="RSAPSSParamsType">
<xs:sequence>
<xs:element ref="ds:DigestMethod" minOccurs="0"/>
<xs:element name="MaskGenerationFunction"
type="pss:MaskGenerationFunctionType" minOccurs="0"/>
<xs:element name="SaltLength" type="xs:int"
minOccurs="0"/>
<xs:element name="TrailerField" type="xs:int"
minOccurs="0"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="MaskGenerationFunctionType">
<xs:sequence>
<xs:element ref="ds:DigestMethod" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="Algorithm" type="xs:anyURI"
default="http://www.w3.org/2007/05/xmldsig-more#MGF1"/>
</xs:complexType>
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2.3.10 RSASSA-PSS without Parameters
[RFC8017] currently specifies only one mask generation function MGF1
based on a hash function. Although [RFC8017] allows for
parameterization, the default is to use the same hash function as the
digest method function. Only this default approach is supported by
this section; therefore, the definition of a mask generation function
type is not needed yet. The same applies to the trailer field. There
is only one value (0xBC) specified in [RFC8017]. Hence, this default
parameter must be used for signature generation. The default salt
length is the length of the hash function.
Identifiers:
http://www.w3.org/2007/05/xmldsig-more#sha3-224-rsa-MGF1
http://www.w3.org/2007/05/xmldsig-more#sha3-256-rsa-MGF1
http://www.w3.org/2007/05/xmldsig-more#sha3-384-rsa-MGF1
http://www.w3.org/2007/05/xmldsig-more#sha3-512-rsa-MGF1
http://www.w3.org/2007/05/xmldsig-more#md2-rsa-MGF1
http://www.w3.org/2007/05/xmldsig-more#md5-rsa-MGF1
http://www.w3.org/2007/05/xmldsig-more#sha1-rsa-MGF1
http://www.w3.org/2007/05/xmldsig-more#sha224-rsa-MGF1
http://www.w3.org/2007/05/xmldsig-more#sha256-rsa-MGF1
http://www.w3.org/2007/05/xmldsig-more#sha384-rsa-MGF1
http://www.w3.org/2007/05/xmldsig-more#sha512-rsa-MGF1
http://www.w3.org/2007/05/xmldsig-more#ripemd128-rsa-MGF1
http://www.w3.org/2007/05/xmldsig-more#ripemd160-rsa-MGF1
http://www.w3.org/2007/05/xmldsig-more#whirlpool-rsa-MGF1
An example of use is:
<SignatureMethod
Algorithm=
"http://www.w3.org/2007/05/xmldsig-more#SHA3-256-rsa-MGF1"
/>
2.3.11 RSA-SHA224
Identifier:
http://www.w3.org/2001/04/xmldsig-more#rsa-sha224
This implies the PKCS#1 v1.5 padding algorithm [RFC8017] as described
in Section 2.3.1 but with the ASN.1 BER SHA-224 algorithm designator
prefix. An example of use is:
<SignatureMethod
Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha224" />
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Because it takes about the same effort to calculate a SHA-224 message
digest as it does a SHA-256 message digest, it is suggested that RSA-
SHA256 be used in preference to RSA-SHA224 where possible.
See also Appendix B concerning an erroneous version of this URI that
appeared in [RFC6931].
2.3.12 Edwards-Curve
The Edwards-curve Digital Signature Algorithm (EdDSA) is a variant of
Schnorr's signature system with Edwards curves. A specification is
provided and some advantages listed in [RFC8032]. The general EdDSA
takes 11 parameters that must be carefully chosen for secure and
efficient operation. Identifiers for two variants, Ed25519 and Ed448,
are given below.
Ed25519 uses 32-octet public keys and produces 64-octet signatures.
It provides about 128 bits of security and uses SHA-512 (see Section
2.2.2) as its hash algorithm.
Ed448 uses 57-octet public keys and produces 114-octet signatures. It
provides about 224 bits of security and uses "SHAKE256" [FIPS202] as
its hash algorithm. (SHAKE256 is specified by NIST as an "Extensible
Output Function" and not specified or approved by NIST as a secure
hash function.)
For further information on the variants of EdDSA identified below,
see [RFC8032].
Identifiers:
http://www.w3.org/2021/04/xmldsig-more#eddsa-ed25519ph
http://www.w3.org/2021/04/xmldsig-more#eddsa-ed25519ctx
http://www.w3.org/2021/04/xmldsig-more#eddsa-ed25519
http://www.w3.org/2021/04/xmldsig-more#eddsa-ed448
http://www.w3.org/2021/04/xmldsig-more#eddsa-ed448ph
An example of use is:
<SignatureMethod Algorithm=
"http://www.w3.org/2021/04/xmldsig-more#eddsa-ed448" />
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2.4 Minimal Canonicalization
Thus far, two independent interoperable implementations of Minimal
Canonicalization have not been announced. Therefore, when XML
Digital Signature was advanced along the Standards Track from
[RFC3075] to [RFC3275], Minimal Canonicalization was dropped.
However, there was still interest. For its definition, see Section
6.5.1 of [RFC3075].
For reference, its identifier remains:
http://www.w3.org/2000/09/xmldsig#minimal
2.5 Transform Algorithms
The XPointer Transform algorithm syntax is described below. All
CanonicalizationMethod algorithms can also be used as Transform
algorithms.
2.5.1 XPointer
Identifier:
http://www.w3.org/2001/04/xmldsig-more#xptr
This transform algorithm takes an [XPointer] as an explicit
parameter. An example of use is:
<Transform
Algorithm="http://www.w3.org/2001/04/xmldsig-more/xptr">
<XPointer
xmlns="http://www.w3.org/2001/04/xmldsig-more/xptr">
xpointer(id("foo")) xmlns(bar=http://foobar.example)
xpointer(//bar:Zab[@Id="foo"])
</XPointer>
</Transform>
Schema Definition:
<element name="XPointer" type="string"/>
DTD:
<!ELEMENT XPointer (#PCDATA) >
Input to this transform is an octet stream (which is then parsed into
XML).
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Output from this transform is a node set; the results of the XPointer
are processed as defined in the XMLDSIG specification [RFC3275] for a
same-document XPointer.
2.6 EncryptionMethod Algorithms
This subsection gives identifiers and information for several
EncryptionMethod Algorithms.
2.6.1 ARCFOUR Encryption Algorithm
Identifier:
http://www.w3.org/2001/04/xmldsig-more#arcfour
ARCFOUR is a fast, simple stream encryption algorithm that is
compatible with RSA Security's RC4 algorithm [RC4]. An example
EncryptionMethod element using ARCFOUR is:
<EncryptionMethod
Algorithm="http://www.w3.org/2001/04/xmldsig-more#arcfour">
<KeySize>40</KeySize>
</EncryptionMethod>
Arcfour makes use of the generic KeySize parameter specified and
defined in [XMLENC11].
2.6.2 Camellia Block Encryption
Identifiers:
http://www.w3.org/2001/04/xmldsig-more#camellia128-cbc
http://www.w3.org/2001/04/xmldsig-more#camellia192-cbc
http://www.w3.org/2001/04/xmldsig-more#camellia256-cbc
Camellia is a block cipher with the same interface as the AES
[Camellia] [RFC3713]; it has a 128-bit block size and 128-, 192-, and
256-bit key sizes. In XML Encryption Camellia is used in the same way
as the AES: It is used in the Cipher Block Chaining (CBC) mode with a
128-bit initialization vector (IV). The resulting cipher text is
prefixed by the IV. If included in XML output, it is then base64
encoded. An example Camellia EncryptionMethod is as follows:
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<EncryptionMethod
Algorithm=
"http://www.w3.org/2001/04/xmldsig-more#camellia128-cbc"
/>
2.6.3 Camellia Key Wrap
Identifiers:
http://www.w3.org/2001/04/xmldsig-more#kw-camellia128
http://www.w3.org/2001/04/xmldsig-more#kw-camellia192
http://www.w3.org/2001/04/xmldsig-more#kw-camellia256
Camellia [Camellia] [RFC3713] key wrap is identical to the AES key
wrap algorithm [RFC3394] specified in the XML Encryption standard
with "AES" replaced by "Camellia". As with AES key wrap, the check
value is 0xA6A6A6A6A6A6A6A6.
The algorithm is the same whatever the size of the Camellia key used
in wrapping, called the "key encrypting key" or "KEK". If Camellia is
supported, it is particularly suggested that wrapping 128-bit keys
with a 128-bit KEK and wrapping 256-bit keys with a 256-bit KEK be
supported.
An example of use is:
<EncryptionMethod
Algorithm=
"http://www.w3.org/2001/04/xmldsig-more#kw-camellia128"
/>
2.6.4 PSEC-KEM, RSAES-KEM, and ECIES-KEM
Identifiers:
http://www.w3.org/2001/04/xmldsig-more#psec-kem
http://www.w3.org/2010/xmlsec-ghc#rsaes-kem
http://www.w3.org/2010/xmlsec-ghc#ecies-kem
These algorithms, specified in [18033-2], are key encapsulation
mechanisms using elliptic curve encryption. RSAEA-KEM and ECIES-KEM
are also specified in [GENERIC].
An example of use of PSEC-KEM is:
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<EncryptionMethod
Algorithm="http://www.w3.org/2001/04/xmldsig-more#psec-kem">
<ECParameters>
<Version>version</Version>
<FieldID>id</FieldID>
<Curve>curve</Curve>
<Base>base</Base>
<Order>order</Order>
<Cofactor>cofactor</Cofactor>
</ECParameters>
</EncryptionMethod>
See [18033-2] for information on the parameters above.
2.6.5 SEED Block Encryption
Identifier:
http://www.w3.org/2007/05/xmldsig-more#seed128-cbc
SEED [RFC4269] is a 128-bit block size with 128-bit key size. In XML
Encryption, SEED can be used in the Cipher Block Chaining (CBC) mode
with a 128-bit initialization vector (IV). The resulting cipher text
is prefixed by the IV. If included in XML output, it is then base64
encoded.
An example SEED EncryptionMethod is as follows:
<EncryptionMethod
Algorithm="http://www.w3.org/2007/05/xmldsig-more#seed128-cbc" />
2.6.6 SEED Key Wrap
Identifier:
http://www.w3.org/2007/05/xmldsig-more#kw-seed128
Key wrapping with SEED is identical to Section 2.2.1 of [RFC3394]
with "AES" replaced by "SEED". The algorithm is specified in
[RFC4010]. The implementation of SEED is optional. The default
initial value is 0xA6A6A6A6A6A6A6A6.
An example of use is:
<EncryptionMethod
Algorithm=
"http://www.w3.org/2007/05/xmldsig-more#kw-seed128"
/>
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2.6.7 ChaCha20
Identifier:
http://www.w3.org/2021/04/xmldsig-more#chacha20
ChaCha20 [RFC8439], a stream cipher, is a variant of Salsa20
[ChaCha]. It is considerably faster than AES in software-only
implementations. In addition to a 256-bit key and the plain text to
be encrypted, ChaCha20 takes a 96-bit Nonce and a 32-bit Counter. The
Nonce and Counter are represented as hex in nested elements as shown
below.
An example of use is:
<EncryptionMethod
Algorithm=
"http://www.w3.org/2021/04/xmldsig-more#chacha20">
<Nonce>0123456789abcdef01234567</Nonce>
<Counter>fedcba09</Counter>
</EncryptionMethod>
2.6.8 ChaCha20+Poly1305
Identifier:
http://www.w3.org/2021/04/xmldsig-more#chacha20poly1305
ChaCha20+Poly1305 is an Authenticated Encryption with Additional Data
(AEAD) algorithm. In addition to a 256-bit key and plain text to be
encrypted and authenticated, ChaCha20+Poly1305 takes a 96-bit Nonce
and variable length Additional Authenticated Data (AAD). The Nonce is
represented as a child element of the EncryptionMethod element with a
hex value. The AAD is a string which may be null. The AAD element may
be absent in which case the AAD is null. The CipherData, either
present in the CipherValue or by reference, is the concatenation of
the encrypted ChaCha20 output and the Poly1305 128-bit tag.
An example of use is:
<EncryptionMethod
Algorithm=
"http://www.w3.org/2021/04/xmldsig-more#chacha20poly1305">
<Nonce>0123456789abcdef01234567</Nonce>
<AAD>The quick brown fox jumps over the lazy dog.</AAD>
</EncryptionMethod>
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2.7 Key AgreementMethod Algorithms
This subsection gives identifiers and information
- for an additional key AgreementMethod Algorithm [XMLENC11] and
- for a key derivation function HKDF since such an algorithm fits
most naturally as an "AgreementMethod".
2.7.1 X25519 Key Agreement
Identifier:
http://www.w3.org/2021/04/xmldsig-more#x25519
The X25519 key agreement algorithm is specified in [RFC7748].
2.7.2 HKDF Key Derivation
Identifier:
http://www.w3.org/2021/04/xmldsig-more#hkdf
The HMAC-based Extract-and-Expand Key Derivation Function (HKDF
[RFC5869]). Although perhaps not exactly the sort of key agreement
algorithm for which the AgreementMethod element was originally
specified to go under the KeyInfo element, this is the most natural
way to classify key derivation algorithms in XML security.
HKDF takes as inputs a hash function, an optional non-secret "salt",
initial keying material (IKM), optional context and application
specific "info", and the required output keying size. Note that these
strictly determine the output so, for example, invoking HKDF at
different times but with the same salt, info, initial keying
material, and output key size will produce identical output keying
material.
The inputs can be supplied to HKDF as follows:
hash function: The algorithm attribute of a child DigestMethod
element.
salt: The content of a Salt child element of AgreementMethod in
hex. If not provided, a string of zero octets as long as the hash
function output is used as specified in [RFC5869].
IKM: The content of an OriginatorKeyInfo child element of
AgreementMethod in hex. May be absent in some applications where
this is known through some other method.
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info: The content of the KA-Nonce child element of AgreementMethod
in hex.
size: The content of a KeySize child element of AgreementMethod as
a decimal number.
Here is the test case from Section A.1 in Appendix A to [RFC5869] as
an example:
<AgreementMethod
algorithm="http://www.w3.org/2021/04/xmldsig-more#hkdf">
<DigestMethod
algorithm="http://www.w3.org/2001/04/xmldsig-more#hmac-sha256"/>
<Salt>000102030405060708090a0b0c</Salt>
<OriginatorKeyInfo>0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b
</OriginatorKeyInfo>
<KA-Nonce>f0f1f2f3f4f5f6f7f8f9</KA-Nonce>
<KeySize>42</KeySize>
</AgreementMethod>
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3. KeyInfo
In Section 3.1 below, a new KeyInfo element child is specified, while
in Section 3.2, additional KeyInfo Type values for use in
RetrievalMethod are specified.
3.1 PKCS #7 Bag of Certificates and CRLs
A PKCS #7 [RFC2315] "signedData" can also be used as a bag of
certificates and/or certificate revocation lists (CRLs). The
PKCS7signedData element is defined to accommodate such structures
within KeyInfo. The binary PKCS #7 structure is base64 [RFC2045]
encoded. Any signer information present is ignored. The following
is an example [RFC3092], eliding the base64 data:
<foo:PKCS7signedData
xmlns:foo="http://www.w3.org/2001/04/xmldsig-more">
...
</foo:PKCS7signedData>
3.2 Additional RetrievalMethod Type Values
The Type attribute of RetrievalMethod is an optional identifier for
the type of data to be retrieved. The result of dereferencing a
RetrievalMethod reference for all KeyInfo types with an XML structure
is an XML element or document with that element as the root. The
various "raw" key information types return a binary value. Thus, they
require a Type attribute because they are not unambiguously parsable.
Identifiers:
http://www.w3.org/2001/04/xmldsig-more#KeyName
http://www.w3.org/2001/04/xmldsig-more#KeyValue
http://www.w3.org/2001/04/xmldsig-more#PKCS7signedData
http://www.w3.org/2001/04/xmldsig-more#rawPGPKeyPacket
http://www.w3.org/2001/04/xmldsig-more#rawPKCS7signedData
http://www.w3.org/2001/04/xmldsig-more#rawSPKISexp
http://www.w3.org/2001/04/xmldsig-more#rawX509CRL
http://www.w3.org/2001/04/xmldsig-more#RetrievalMethod
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4. Indexes
The following subsections provide an index by URI and by fragment
identifier (the portion of the URI after "#") of the algorithm and
KeyInfo URIs defined in this document and in the standards plus the
one KeyInfo child element name defined in this document. The
"Sec/Doc" column has the section of this document or, if not
specified in this document, the standards document where the item is
specified. See also [XMLSECXREF].
4.1 Index by Fragment Index
The initial "http://www.w3.org/" part of the URI is not included
below. The first six entries have a null fragment identifier or no
fragment identifier. "{Bad}" indicates a Bad value that was
accidentally included in [RFC6931]. Implementations SHOULD only
generate the correct URI but SHOULD understand both the correct and
erroneous URI. See also Appendix B.
Fragment URI Sec/Doc
--------- ---- --------
2002/06/xmldsig-filter2 [XPATH]
2006/12/xmlc12n11# {Bad} [CANON11]
2006/12/xmlc14n11# [CANON11]
TR/1999/REC-xslt-19991116 [XSLT]
TR/1999/REC-xpath-19991116 [XPATH]
TR/2001/06/xml-exc-c14n# [XCANON]
TR/2001/REC-xml-c14n-20010315 [CANON10]
TR/2001/REC-xmlschema-1-20010502 [Schema]
aes128-cbc 2001/04/xmlenc#aes128-cbc [XMLENC11]
aes128-gcm 2009/xmlenc11#aes128-gcm [XMLENC11]
aes192-cbc 2001/04/xmlenc#aes192-cbc [XMLENC11]
aes192-gcm 2009/xmlenc11#aes192-gcm [XMLENC11]
aes256-cbc 2001/04/xmlenc#aes256-cbc [XMLENC11]
aes256-gcm 2009/xmlenc11#aes256-gcm [XMLENC11]
arcfour 2001/04/xmldsig-more#arcfour 2.6.1
base64 2000/09/xmldsig#base64 [RFC3275]
camellia128-cbc 2001/04/xmldsig-more#camellia128-cbc 2.6.2
camellia192-cbc 2001/04/xmldsig-more#camellia192-cbc 2.6.2
camellia256-cbc 2001/04/xmldsig-more#camellia256-cbc 2.6.2
chacha20 2021/04/xmldsig-more#chacha20 2.6.7
chacha20poly1305 2021/04/xmldsig-more#chacha20poly1305 2.6.8
ConcatKDF 2009/xmlenc11#ConcatKDF [XMLENC11]
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decrypt#XML 2002/07/decrypt#XML [DECRYPT]
decrypt#Binary 2002/07/decrypt#Binary [DECRYPT]
DEREncodedKeyValue 2009/xmldsig11#DEREncodedKeyValue [XMLDSIG11]
dh 2001/04/xmlenc#dh [XMLENC11]
dh-es 2009/xmlenc11#dh-es [XMLENC11]
dsa-sha1 2000/09/xmldsig#dsa-sha1 [RFC3275]
dsa-sha256 2009/xmldsig11#dsa-sha256 [XMLDSIG11]
DSAKeyValue 2000/09/xmldsig#DSAKeyValue [XMLDSIG11]
ECDH-ES 2009/xmlenc11#ECDH-ES [XMLENC11]
ecdsa-ripemd160 2007/05/xmldsig-more#ecdsa-ripemd160 2.3.6
ecdsa-sha1 2001/04/xmldsig-more#ecdsa-sha1 2.3.6
ecdsa-sha224 2001/04/xmldsig-more#ecdsa-sha224 2.3.6
ecdsa-sha256 2001/04/xmldsig-more#ecdsa-sha256 2.3.6
ecdsa-sha384 2001/04/xmldsig-more#ecdsa-sha384 2.3.6
ecdsa-sha512 2001/04/xmldsig-more#ecdsa-sha512 2.3.6
ecdsa-sha3-224 2021/04/xmldsig-more#ecdsa-sha3-224 2.3.6
ecdsa-sha3-256 2021/04/xmldsig-more#ecdsa-sha3-256 2.3.6
ecdsa-sha3-384 2021/04/xmldsig-more#ecdsa-sha3-384 2.3.6
ecdsa-sha3-512 2021/04/xmldsig-more#ecdsa-sha3-512 2.3.6
ecdsa-whirlpool 2007/05/xmldsig-more#ecdsa-whirlpool 2.3.5
ecies-kem 2010/xmlsec-ghc#ecies-kem [GENERIC]
ECKeyValue 2009/xmldsig11#ECKeyValue [XMLDSIG11]
eddsa-ed25519 2021/04/xmldsig-more#eddsa-ed25519 2.3.12
eddsa-ed25519ctx 2021/04/xmldsig-more#eddsa-ed25519ctx 2.3.12
eddsa-ed25519ph 2021/04/xmldsig-more#eddsa-ed25519ph 2.3.12
eddsa-ed448 2021/04/xmldsig-more#eddsa-ed448 2.3.12
eddsa-ed448ph 2021/04/xmldsig-more#eddsa-ed448ph 2.3.12
enveloped-signature 2000/09/xmldsig#enveloped-signature [RFC3275]
esign-sha1 2001/04/xmldsig-more#esign-sha1 2.3.7
esign-sha224 2001/04/xmldsig-more#esign-sha224 2.3.7
esign-sha256 2001/04/xmldsig-more#esign-sha256 2.3.7
esign-sha384 2001/04/xmldsig-more#esign-sha384 2.3.7
esign-sha512 2001/04/xmldsig-more#esign-sha512 2.3.7
generic-hybrid 2010/xmlsec-ghc#generic-hybrid [GENERIC]
hkdf 2021/04/xmldsig-more#hkdf 2.7.2
hmac-md5 2001/04/xmldsig-more#hmac-md5 2.2.1
hmac-ripemd160 2001/04/xmldsig-more#hmac-ripemd160 2.2.3
hmac-sha1 2000/09/xmldsig#hmac-sha1 [RFC3275]
hmac-sha224 2001/04/xmldsig-more#hmac-sha224 2.2.2
hmac-sha256 2001/04/xmldsig-more#hmac-sha256 2.2.2
hmac-sha384 2001/04/xmldsig-more#hmac-sha384 2.2.2
hmac-sha512 2001/04/xmldsig-more#hmac-sha512 2.2.2
KeyName 2001/04/xmldsig-more#KeyName 3.2
KeyValue 2001/04/xmldsig-more#KeyValue 3.2
kw-aes128 2001/04/xmlenc#kw-aes128 [XMLENC11]
kw-aes128-pad 2009/xmlenc11#kw-aes-128-pad [XMLENC11]
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kw-aes192 2001/04/xmlenc#kw-aes192 [XMLENC11]
kw-aes192-pad 2009/xmlenc11#kw-aes-192-pad [XMLENC11]
kw-aes256 2001/04/xmlenc#kw-aes256 [XMLENC11]
kw-aes256-pad 2009/xmlenc11#kw-aes-256-pad [XMLENC11]
kw-camellia128 2001/04/xmldsig-more#kw-camellia128 2.6.3
kw-camellia192 2001/04/xmldsig-more#kw-camellia192 2.6.3
kw-camellia256 2001/04/xmldsig-more#kw-camellia256 2.6.3
kw-seed128 2007/05/xmldsig-more#kw-seed128 2.6.6
md2-rsa-MGF1 2007/05/xmldsig-more#md2-rsa-MGF1 2.3.10
md5 2001/04/xmldsig-more#md5 2.1.1
md5-rsa-MGF1 2007/05/xmldsig-more#md5-rsa-MGF1 2.3.10
MGF1 2007/05/xmldsig-more#MGF1 2.3.9
mgf1sha1 2009/xmlenc11#mgf1sha1 [XMLENC11]
mgf1sha224 2009/xmlenc11#mgf1sha224 [XMLENC11]
mgf1sha256 2009/xmlenc11#mgf1sha256 [XMLENC11]
mgf1sha384 2009/xmlenc11#mgf1sha384 [XMLENC11]
mgf1sha512 2009/xmlenc11#mgf1sha512 [XMLENC11]
MgmtData 2000/09/xmldsig#MgmtData [XMLDSIG11]
minimal 2000/09/xmldsig#minimal 2.4
pbkdf2 2009/xmlenc11#pbkdf2 [XMLENC11]
PGPData 2000/09/xmldsig#PGPData [XMLDSIG11]
PKCS7signedData 2001/04/xmldsig-more#PKCS7signedData 3.1
PKCS7signedData 2001/04/xmldsig-more#PKCS7signedData 3.2
poly1305 2021/04/xmldsig-more#poly1305 2.2.4
psec-kem 2001/04/xmldsig-more#psec-kem 2.6.4
rawPGPKeyPacket 2001/04/xmldsig-more#rawPGPKeyPacket 3.2
rawPKCS7signedData 2001/04/xmldsig-more#rawPKCS7signedData 3.2
rawSPKISexp 2001/04/xmldsig-more#rawSPKISexp 3.2
rawX509Certificate 2000/09/xmldsig#rawX509Certificate [RFC3275]
rawX509CRL 2001/04/xmldsig-more#rawX509CRL 3.2
RetrievalMethod 2001/04/xmldsig-more#RetrievalMethod 3.2
ripemd128-rsa-MGF1 2007/05/xmldsig-more#ripemd128-rsa-MGF1
2.3.10
ripemd160 2001/04/xmlenc#ripemd160 [XMLENC11]
ripemd160-rsa-MGF1 2007/05/xmldsig-more#ripemd160-rsa-MGF1
2.3.10
rsa-1_5 2001/04/xmlenc#rsa-1_5 [XMLENC11]
rsa-md5 2001/04/xmldsig-more#rsa-md5 2.3.1
rsa-oaep 2009/xmlenc11#rsa-oaep [XMLENC11]
rsa-oaep-mgf1p 2001/04/xmlenc#rsa-oaep-mgf1p [XMLENC11]
rsa-pss 2007/05/xmldsig-more#rsa-pss 2.3.9
rsa-ripemd160 2001/04/xmldsig-more#rsa-ripemd160 2.3.5
rsa-sha1 2000/09/xmldsig#rsa-sha1 [RFC3275]
rsa-sha224 2007/05/xmldsig-more#rsa-sha224 {Bad} 2.3.11
rsa-sha224 2001/04/xmldsig-more#rsa-sha224 2.3.11
rsa-sha256 2001/04/xmldsig-more#rsa-sha256 2.3.2
rsa-sha384 2001/04/xmldsig-more#rsa-sha384 2.3.3
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rsa-sha512 2001/04/xmldsig-more#rsa-sha512 2.3.4
rsa-whirlpool 2007/05/xmldsig-more#rsa-whirlpool 2.3.5
rsaes-kem 2010/xmlsec-ghc#rsaes-kem [GENERIC]
RSAKeyValue 2000/09/xmldsig#RSAKeyValue [XMLDSIG11]
seed128-cbc 2007/05/xmldsig-more#seed128-cbc 2.6.5
sha1 2000/09/xmldsig#sha1 [RFC3275]
sha1-rsa-MGF1 2007/05/xmldsig-more#sha1-rsa-MGF1 2.3.10
sha224 2001/04/xmldsig-more#sha224 2.1.2
sha224-rsa-MGF1 2007/05/xmldsig-more#sha224-rsa-MGF1 2.3.10
sha256 2001/04/xmlenc#sha256 [XMLENC11]
sha256-rsa-MGF1 2007/05/xmldsig-more#sha256-rsa-MGF1 2.3.10
sha3-224 2007/05/xmldsig-more#sha3-224 2.1.5
sha3-224-rsa-MGF1 2007/05/xmldsig-more#sha3-224-rsa-MGF1 2.3.10
sha3-256 2007/05/xmldsig-more#sha3-256 2.1.5
sha3-256-rsa-MGF1 2007/05/xmldsig-more#sha3-256-rsa-MGF1 2.3.10
sha3-384 2007/05/xmldsig-more#sha3-384 2.1.5
sha3-384-rsa-MGF1 2007/05/xmldsig-more#sha3-384-rsa-MGF1 2.3.10
sha3-512 2007/05/xmldsig-more#sha3-512 2.1.5
sha3-512-rsa-MGF1 2007/05/xmldsig-more#sha3-512-rsa-MGF1 2.3.10
sha384 2001/04/xmldsig-more#sha384 2.1.3
sha384-rsa-MGF1 2007/05/xmldsig-more#sha384-rsa-MGF1 2.3.10
sha512 2001/04/xmlenc#sha512 [XMLENC11]
sha512-rsa-MGF1 2007/05/xmldsig-more#sha512-rsa-MGF1 2.3.10
siphash-2-4 2021/04/xmldsig-more#siphash-2-4 2.2.5
SPKIData 2000/09/xmldsig#SPKIData [XMLDSIG11]
tripledes-cbc 2001/04/xmlenc#tripledes-cbc [XMLENC11]
whirlpool 2007/05/xmldsig-more#whirlpool 2.1.4
whirlpool-rsa-MGF1 2007/05/xmldsig-more#whirlpool-rsa-MGF1
2.3.10
WithComments 2006/12/xmlc14n11#WithComments [CANON11]
WithComments TR/2001/06/xml-exc-c14n#WithComments
[XCANON]
WithComments TR/2001/REC-xml-c14n-20010315#WithComments
[CANON10]
x25519 2021/04/xmldsig-more#x25519 2.7.1
X509Data 2000/09/xmldsig#X509Data [XMLDSIG11]
xmss-sha2-192 2021/04/xmldsig-more#xmss-sha2-192 2.2.6
xmss-sha2-256 2021/04/xmldsig-more#xmss-sha2-256 2.2.6
xmss-shake256-192 2021/04/xmldsig-more#xmss-shake256-192 2.2.6
xmss-shake256-256 2021/04/xmldsig-more#xmss-shake256-256 2.2.6
xmssmt-sha2-192 2021/04/xmldsig-more#xmssmt-sha2-192 2.2.6
xmssmt-sha2-256 2021/04/xmldsig-more#xmssmt-sha2-256 2.2.6
xmssmt-shake256-192 2021/04/xmldsig-more#xmssmt-shake256-192
2.2.6
xmssmt-shake256-256 2021/04/xmldsig-more#xmssmt-shake256-256
2.2.6
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xptr 2001/04/xmldsig-more#xptr 2.5.1
--------- ---- --------
Fragment URI Sec/Doc
The initial "http://www.w3.org/" part of the URI is not included
above.
4.2 Index by URI
The initial "http://www.w3.org/" part of the URI is not included
below. "{Bad}" indicates a Bad value that was accidentally included
in [RFC6931]. Implementations SHOULD only generate the correct URI
but SHOULD understand both the correct and erroneous URI. See also
Appendix B.
URI Sec/Doc Type
---- -------- -----
2000/09/xmldsig#base64 [RFC3275] Transform
2000/09/xmldsig#DSAKeyValue [RFC3275] Retrieval type
2000/09/xmldsig#dsa-sha1 [RFC3275] SignatureMethod
2000/09/xmldsig#enveloped-signature [RFC3275] Transform
2000/09/xmldsig#hmac-sha1 [RFC3275] SignatureMethod
2000/09/xmldsig#MgmtData [RFC3275] Retrieval type
2000/09/xmldsig#minimal 2.4 Canonicalization
2000/09/xmldsig#PGPData [RFC3275] Retrieval type
2000/09/xmldsig#rawX509Certificate [RFC3275] Retrieval type
2000/09/xmldsig#rsa-sha1 [RFC3275] SignatureMethod
2000/09/xmldsig#RSAKeyValue [RFC3275] Retrieval type
2000/09/xmldsig#sha1 [RFC3275] DigestAlgorithm
2000/09/xmldsig#SPKIData [RFC3275] Retrieval type
2000/09/xmldsig#X509Data [RFC3275] Retrieval type
2001/04/xmldsig-more#arcfour 2.6.1 EncryptionMethod
2001/04/xmldsig-more#camellia128-cbc 2.6.2 EncryptionMethod
2001/04/xmldsig-more#camellia192-cbc 2.6.2 EncryptionMethod
2001/04/xmldsig-more#camellia256-cbc 2.6.2 EncryptionMethod
2001/04/xmldsig-more#ecdsa-sha1 2.3.6 SignatureMethod
2001/04/xmldsig-more#ecdsa-sha224 2.3.6 SignatureMethod
2001/04/xmldsig-more#ecdsa-sha256 2.3.6 SignatureMethod
2001/04/xmldsig-more#ecdsa-sha384 2.3.6 SignatureMethod
2001/04/xmldsig-more#ecdsa-sha512 2.3.6 SignatureMethod
2001/04/xmldsig-more#esign-sha1 2.3.7 SignatureMethod
2001/04/xmldsig-more#esign-sha224 2.3.7 SignatureMethod
2001/04/xmldsig-more#esign-sha256 2.3.7 SignatureMethod
2001/04/xmldsig-more#esign-sha384 2.3.7 SignatureMethod
2001/04/xmldsig-more#esign-sha512 2.3.7 SignatureMethod
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2001/04/xmldsig-more#hmac-md5 2.2.1 SignatureMethod
2001/04/xmldsig-more#hmac-ripemd160 2.2.3 SignatureMethod
2001/04/xmldsig-more#hmac-sha224 2.2.2 SignatureMethod
2001/04/xmldsig-more#hmac-sha256 2.2.2 SignatureMethod
2001/04/xmldsig-more#hmac-sha384 2.2.2 SignatureMethod
2001/04/xmldsig-more#hmac-sha512 2.2.2 SignatureMethod
2001/04/xmldsig-more#KeyName 3.2 Retrieval type
2001/04/xmldsig-more#KeyValue 3.2 Retrieval type
2001/04/xmldsig-more#kw-camellia128 2.6.3 EncryptionMethod
2001/04/xmldsig-more#kw-camellia192 2.6.3 EncryptionMethod
2001/04/xmldsig-more#kw-camellia256 2.6.3 EncryptionMethod
2001/04/xmldsig-more#md5 2.1.1 DigestAlgorithm
2001/04/xmldsig-more#PKCS7signedData 3.2 Retrieval type
2001/04/xmldsig-more#psec-kem 2.6.4 EncryptionMethod
2001/04/xmldsig-more#rawPGPKeyPacket 3.2 Retrieval type
2001/04/xmldsig-more#rawPKCS7signedData 3.2 Retrieval type
2001/04/xmldsig-more#rawSPKISexp 3.2 Retrieval type
2001/04/xmldsig-more#rawX509CRL 3.2 Retrieval type
2001/04/xmldsig-more#RetrievalMethod 3.2 Retrieval type
2001/04/xmldsig-more#rsa-md5 2.3.1 SignatureMethod
2001/04/xmldsig-more#rsa-sha224 2.3.11 SignatureMethod
2001/04/xmldsig-more#rsa-sha256 2.3.2 SignatureMethod
2001/04/xmldsig-more#rsa-sha384 2.3.3 SignatureMethod
2001/04/xmldsig-more#rsa-sha512 2.3.4 SignatureMethod
2001/04/xmldsig-more#rsa-ripemd160 2.3.5 SignatureMethod
2001/04/xmldsig-more#sha224 2.1.2 DigestAlgorithm
2001/04/xmldsig-more#sha384 2.1.3 DigestAlgorithm
2001/04/xmldsig-more#xptr 2.5.1 Transform
2001/04/xmldsig-more#PKCS7signedData 3.1 KeyInfo child
2001/04/xmlenc#aes128-cbc [XMLENC11] EncryptionMethod
2001/04/xmlenc#aes192-cbc [XMLENC11] EncryptionMethod
2001/04/xmlenc#aes256-cbc [XMLENC11] EncryptionMethod
2001/04/xmlenc#dh [XMLENC11] AgreementMethod
2001/04/xmlenc#kw-aes128 [XMLENC11] EncryptionMethod
2001/04/xmlenc#kw-aes192 [XMLENC11] EncryptionMethod
2001/04/xmlenc#kw-aes256 [XMLENC11] EncryptionMethod
2001/04/xmlenc#ripemd160 [XMLENC11] DigestAlgorithm
2001/04/xmlenc#rsa-1_5 [XMLENC11] EncryptionMethod
2001/04/xmlenc#rsa-oaep-mgf1p [XMLENC11] EncryptionMethod
2001/04/xmlenc#sha256 [XMLENC11] DigestAlgorithm
2001/04/xmlenc#sha512 [XMLENC11] DigestAlgorithm
2001/04/xmlenc#tripledes-cbc [XMLENC11] EncryptionMethod
2002/06/xmldsig-filter2 [XPATH] Transform
2002/07/decrypt#XML [DECRYPT] Transform
2002/07/decrypt#Binary [DECRYPT] Transform
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2006/12/xmlc12n11# {Bad} [CANON11] Canonicalization
2006/12/xmlc14n11# [CANON11] Canonicalization
2006/12/xmlc14n11#WithComments [CANON11] Canonicalization
2007/05/xmldsig-more#ecdsa-ripemd160 2.3.6 SignatureMethod
2007/05/xmldsig-more#ecdsa-whirlpool 2.3.5 SignatureMethod
2007/05/xmldsig-more#kw-seed128 2.6.6 EncryptionMethod
2007/05/xmldsig-more#md2-rsa-MGF1 2.3.10 SignatureMethod
2007/05/xmldsig-more#md5-rsa-MGF1 2.3.10 SignatureMethod
2007/05/xmldsig-more#MGF1 2.3.9 SignatureMethod
2007/05/xmldsig-more#ripemd128-rsa-MGF1 2.3.10 SignatureMethod
2007/05/xmldsig-more#ripemd160-rsa-MGF1 2.3.10 SignatureMethod
2007/05/xmldsig-more#rsa-pss 2.3.9 SignatureMethod
2007/05/xmldsig-more#rsa-sha224 {Bad} 2.3.11 SignatureMethod
2007/05/xmldsig-more#rsa-whirlpool 2.3.5 SignatureMethod
2007/05/xmldsig-more#seed128-cbc 2.6.5 EncryptionMethod
2007/05/xmldsig-more#sha1-rsa-MGF1 2.3.10 SignatureMethod
2007/05/xmldsig-more#sha224-rsa-MGF1 2.3.10 SignatureMethod
2007/05/xmldsig-more#sha256-rsa-MGF1 2.3.10 SignatureMethod
2007/05/xmldsig-more#sha3-224 2.1.5 DigestAlgorithm
2007/05/xmldsig-more#sha3-224-rsa-MGF1 2.3.10 SignatureMethod
2007/05/xmldsig-more#sha3-256 2.1.5 DigestAlgorithm
2007/05/xmldsig-more#sha3-256-rsa-MGF1 2.3.10 SignatureMethod
2007/05/xmldsig-more#sha3-384 2.1.5 DigestAlgorithm
2007/05/xmldsig-more#sha3-384-rsa-MGF1 2.3.10 SignatureMethod
2007/05/xmldsig-more#sha3-512 2.1.5 DigestAlgorithm
2007/05/xmldsig-more#sha3-512-rsa-MGF1 2.3.10 SignatureMethod
2007/05/xmldsig-more#sha384-rsa-MGF1 2.3.10 SignatureMethod
2007/05/xmldsig-more#sha512-rsa-MGF1 2.3.10 SignatureMethod
2007/05/xmldsig-more#whirlpool 2.1.4 DigestAlgorithm
2007/05/xmldsig-more#whirlpool-rsa-MGF1 2.3.10 SignatureMethod
2009/xmlenc11#kw-aes-128-pad [XMLENC11] EncryptionMethod
2009/xmlenc11#kw-aes-192-pad [XMLENC11] EncryptionMethod
2009/xmlenc11#kw-aes-256-pad [XMLENC11] EncryptionMethod
2009/xmldsig11#dsa-sha256 [XMLDSIG11] SignatureMethod
2009/xmldsig11#ECKeyValue [XMLDSIG11] Retrieval type
2009/xmldsig11#DEREncodedKeyValue [XMLDSIG11] Retrieval type
2009/xmlenc11#aes128-gcm [XMLENC11] EncryptionMethod
2009/xmlenc11#aes192-gcm [XMLENC11] EncryptionMethod
2009/xmlenc11#aes256-gcm [XMLENC11] EncryptionMethod
2009/xmlenc11#ConcatKDF [XMLENC11] EncryptionMethod
2009/xmlenc11#mgf1sha1 [XMLENC11] SignatureMethod
2009/xmlenc11#mgf1sha224 [XMLENC11] SignatureMethod
2009/xmlenc11#mgf1sha256 [XMLENC11] SignatureMethod
2009/xmlenc11#mgf1sha384 [XMLENC11] SignatureMethod
2009/xmlenc11#mgf1sha512 [XMLENC11] SignatureMethod
2009/xmlenc11#pbkdf2 [XMLENC11] EncryptionMethod
2009/xmlenc11#rsa-oaep [XMLENC11] EncryptionMethod
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2009/xmlenc11#ECDH-ES [XMLENC11] EncryptionMethod
2009/xmlenc11#dh-es [XMLENC11] EncryptionMethod
2010/xmlsec-ghc#generic-hybrid [GENERIC] Generic Hybrid
2010/xmlsec-ghc#rsaes-kem [GENERIC] Generic Hybrid
2010/xmlsec-ghc#ecies-kem [GENERIC] Generic Hybrid
2021/04/xmldsig-more#chacha20 2.6.7 EncryptionMethod
2021/04/xmldsig-more#chacha20poly1305 2.6.8 EncryptionMethod
2021/04/xmldsig-more#ecdsa-sha3-224 2.3.6 SignatureMethod
2021/04/xmldsig-more#ecdsa-sha3-256 2.3.6 SignatureMethod
2021/04/xmldsig-more#ecdsa-sha3-384 2.3.6 SignatureMethod
2021/04/xmldsig-more#ecdsa-sha3-512 2.3.6 SignatureMethod
2021/04/xmldsig-more#eddsa-ed25519ph 2.3.12 SignatureMethod
2021/04/xmldsig-more#eddsa-ed25519ctx 2.3.12 SignatureMethod
2021/04/xmldsig-more#eddsa-ed25519 2.3.12 SignatureMethod
2021/04/xmldsig-more#eddsa-ed448 2.3.12 SignatureMethod
2021/04/xmldsig-more#eddsa-ed448ph 2.3.12 SignatureMethod
2021/04/xmldsig-more#hkdf 2.7.2 AgreementMethod
2021/04/xmldsig-more#po1y305 2.2.4 SignatureMethod
2021/04/xmldsig-more#siphash-2-4 2.2.5 SignatureMethod
2021/04/xmldsig-more#x25519 2.7.1 AgreementMethod
2021/04/xmldsig-more#xmss-sha2-192 2.2.6 SignatureMethod
2021/04/xmldsig-more#xmss-sha2-256 2.2.6 SignatureMethod
2021/04/xmldsig-more#xmss-shake256-192 2.2.6 SignatureMethod
2021/04/xmldsig-more#xmss-shake256-256 2.2.6 SignatureMethod
2021/04/xmldsig-more#xmssmt-sha2-192 2.2.6 SignatureMethod
2021/04/xmldsig-more#xmssmt-sha2-256 2.2.6 SignatureMethod
2021/04/xmldsig-more#xmssmt-shake256-192 2.2.6 SignatureMethod
2021/04/xmldsig-more#xmssmt-shake256-256 2.2.6 SignatureMethod
TR/1999/REC-xpath-19991116 [XPATH] Transform
TR/1999/REC-xslt-19991116 [XSLT] Transform
TR/2001/06/xml-exc-c14n# [XCANON] Canonicalization
TR/2001/06/xml-exc-c14n#WithComments
[XCANON] Canonicalization
TR/2001/REC-xml-c14n-20010315 [CANON10] Canonicalization
TR/2001/REC-xml-c14n-20010315#WithComments
[CANON10] Canonicalization
TR/2001/REC-xmlschema-1-20010502 [Schema] Transform
---- -------- -----
URI Sec/Doc Type
The initial "http://www.w3.org/" part of the URI is not included
above. "{Bad}" indicates a Bad value that was accidentally included
in [RFC6931]. Implementations SHOULD only generate the correct URI
but SHOULD understand both the correct and erroneous URI. See also
Appendix B.
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5. Allocation Considerations
W3C and IANA allocation considerations are given below.
5.1 W3C Allocation Considerations
As it is easy for people to construct their own unique URIs [RFC3986]
and, if appropriate, to obtain a URI from the W3C, it is not intended
that any additional "http://www.w3.org/2007/05/xmldsig-more#" URIs be
created. (W3C Namespace stability rules prohibit the creation of new
URIs under "http://www.w3.org/2000/09/xmldsig#" and URIs under
"http://www.w3.org/2001/04/xmldsig-more#" were frozen with the
publication of RFC 4051.)
The W3C has assigned "http://www.w3.org/2021/04/xmldsig-more#" for
additional new URIs specified in this document.
There are also occurrences in this document of
"http://www.w3.org/2010/xmlsec-ghc#" due to the inclusion of some
algorithms from [GENERIC] for convenience.
An "xmldsig-more" URI does not imply any official W3C or IETF status
for these algorithms or identifiers nor does it imply that they are
only useful in digital signatures. Currently, dereferencing such
URIs may or may not produce a temporary placeholder document.
Permission to use these URI prefixes has been given by the W3C.
5.2 IANA Considerations
IANA has established a registry entitled "XML Security URIs". The
contents will be updated to correspond to Section 4.2 of this
document with each section number in the "Sec/Doc" column augmented
with a reference to this RFC (for example, "2.6.4" means "[this
document], Section 2.6.4"). All references to [RFC6931] in that
registry should be updated to [this document].
New entries, including new Types, will be added based on
Specification Required [RFC8126]. Criteria for the designated expert
for inclusion are (1) documentation sufficient for interoperability
of the algorithm or data type and the XML syntax for its
representation and use and (2) sufficient importance as normally
indicated by inclusion in (2a) an approved W3C Note, Proposed
Recommendation, or Recommendation or (2b) an approved IETF RFC.
Typically, the registry will reference a W3C or IETF document
specifying such XML syntax; that document will either contain a more
detailed description of the algorithm or data type or reference
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another document with a more detailed description.
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6. Security Considerations
This RFC is concerned with documenting the URIs that designate
algorithms and some data types used in connection with XML security.
The security considerations vary widely with the particular
algorithms, and the general security considerations for XML security
are outside of the scope of this document but appear in [XMLDSIG11],
[XMLENC11], [CANON10], [CANON11], and [GENERIC].
[RFC6151] should be consulted before considering the use of MD5 as a
DigestMethod or RSA-MD5 as a SignatureMethod.
See [RFC6194] for SHA-1 security considerations.
Additional security considerations are given in connection with the
description of some algorithms in the body of this document.
Implementers should be aware that cryptographic algorithms become
weaker with time. As new cryptoanalysis techniques are developed and
computing performance improves, the work factor to break a particular
cryptographic algorithm will decrease. Therefore, cryptographic
implementations should be modular, allowing new algorithms to be
readily inserted. That is, implementers should be prepared for the
set of mandatory-to-implement algorithms for any particular use to
change over time. This is sometimes referred to as "algorithm
agility".
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Acknowledgements
The contributions of the following, listed in alphabetic order, by
reporting errata against [RFC6931] or contributing to this document,
are gratefully acknowledged:
Roman Danyliw, Pim van der Eijk, Frederick Hirsch, Gayle Noble,
Axel Puhlmann, Peter Yee, and Annie Yousar.
The contributions of the following, listed in alphabetic order, to
[RFC6931], on which this document is based, are gratefully
acknowledged:
Benoit Claise, Adrian Farrel, Stephen Farrell, Ernst Giessmann,
Frederick Hirsch, Bjoern Hoehrmann, Russ Housley, Satoru Kanno,
Charlie Kaufman, Konrad Lanz, HwanJin Lee, Barry Leiba, Peter
Lipp, Subramanian Moonesamy, Thomas Roessler, Hanseong Ryu, Peter
Saint-Andre, and Sean Turner.
The following contributors to RFC 4051 are gratefully acknowledged:
Glenn Adams, Merlin Hughs, Gregor Karlinger, Brian LaMachia, Shiho
Moriai, Joseph Reagle, Russ Housley, and Joel Halpern.
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Appendix A: Changes from [RFC6931]
The following changes have been made in [RFC6931] to produce this
document.
1. Delete Appendix on Changes from RFC 4051, since they were already
included in [RFC6931], and remove reference to RFC 4051 and to
the one Errata against RFC 4051.
2. Fix three errata as follows: [Err3597], [Err3965], and [Err4004].
In cases where [RFC6931] had an erroneous URI, it is still
included in the indices and it is stated that implementations
SHOULD only generate the correct URI but SHOULD understand both
the correct and erroneous URI.
3. Added the following algorithms:
Section Algorithm(s)
------- ------------
2.2.4 Poly1305
2.2.5 SipHash-2-4
2.2.6 XMSS and XMSSMT
2.3.6 ECDSA with SHA3
2.3.12 Edwards-Curve Signatures
2.6.7 ChaCha20
2.6.8 ChaCha20+Poly1305
2.7.1 X25519
2.7.2 HKDF
4. Listed ECIES-KEM and RSAES-KEM in Section 2.6.4 so they are
easier to find even though the URI for them is specified in
[GENERIC].
5. Updated references for [GENERIC] and FIPS 186, added appropriate
references.
6. Addition of some XML examples.
7. Minor typo fixes and editorial changes.
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Appendix B: Bad URIs
[RFC6931] included two bad URIs as shown below. "{Bad}" in the
indexes (Sections 4.1 and 4.2) indicates such a bad value.
Implementations SHOULD only generate the correct URI but SHOULD
understand both the correct and erroneous URI.
2006/12/xmlc12n11#
Appears in the indices (Section 4.1 and 4.2] of [RFC6931] when it
should be "2006/12/xmlc14n11#" (i.e., the "12" inside "xmlc12n11"
should have been "14"). This is [Err3965] and is corrected in
this document.
2007/05/xmldsig-more#rsa-sha224
Appears in the indices (Section 4.1 and 4.2] of [RFC6931] when it
should be "2001/04/xmldsig-more#rsa-sha224". This is [Err4004]
and is corrected in this document.
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Appendix Z: Change History
RFC Editor Note: Please delete this Appendix before publication.
-00 to -01 to -02 to -03 to -04 to -05 to -06 to -07 to -08
Bump up version and date to keep draft alive as a place where new
URIs can be accumulated. At some point in here, author address was
updated.
-08 to -09 to -10
Update author affiliation and references.
-10 to -11
Update author address.
-11 to -12
Bump up version and date to keep draft alive.
-12 to -13
Numerous editorial/typo fixes thanks to Gayle Noble who is added to
the acknowledgements section.
-13 to -14
Numerous additional algorithms almost all as requested by Pim van der
Eijk who is added to the acknowledgements section. Update and add
references.
-14 to -15
Add URLs for ECDSA with SHA3, SipHash-2-4, X25519, XMSS and XMSSMT.
Add RFC reference 5869 for HKDF but not yet added elsewhere in the
document.
-15 to -16
Fix text for ChaCha20 to include the required Nonce and Counter
inputs. Add ChaCha20+Poly1305 AEAD algorithm. Add HKDF key derivation
function.
-16 to -17
Mostly editorial fixes.
-17 to -18
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Resolve AD review comments. Globally replace "byte" with "octet".
Update reference to "US National Institute of Standards and
Technology, "SHA-3 WINNER", February 2013" to reference [FIPS202].
-18 to -19
Resolve GENART review comments.
-19 to -20 to -21
Minor Editorial improvements.
-21 to -22
Fix typos
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Normative References
[10118-3] - ISO, "Information technology -- Security techniques --
Hash-functions -- Part 3: Dedicated hash-functions", ISO/IEC
10118-3:2004, 2004.
[18033-2] - ISO, "Information technology -- Security techniques --
Encryption algorithms -- Part 3: Asymmetric ciphers", ISO/IEC
18033-2:2010, 2010.
[FIPS180-4] - US National Institute of Standards and Technology,
"Secure Hash Standard (SHS)", FIPS 180-4, March 2012,
<http://csrc.nist.gov/publications/fips/fips180-4/
fips-180-4.pdf>.
[FIPS186-4] - US National Institute of Standards and Technology,
"Digital Signature Standard (DSS)", FIPS 186-4, July 2013,
<https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf>.
[FIPS202] - US National Institute of Standards and Technology, "SHA-3
Standard: Permutation-Based Hash and Extendable-Output
Functions", FIPS 202, August 2015,
<https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf>.
[IEEEP1363a] - IEEE, "Standard Specifications for Public Key
Cryptography- Amendment 1: Additional Techniques", IEEE
1363a-2004, 2004.
[NIST800-208] - US National Institute of Standards and Technology,
"Recommendation for Stateful Hash-Based Signature Schemes",
NIST 800-208, Otober 202,
<https://csrc.nist.gov/publications/detail/sp/800-208/final>.
[RC4] - Schneier, B., "Applied Cryptography: Protocols, Algorithms,
and Source Code in C", Second Edition, John Wiley and Sons, New
York, NY, 1996.
[RFC1321] - Rivest, R., "The MD5 Message-Digest Algorithm", RFC 1321,
April 1992.
[RFC2045] - Freed, N. and N. Borenstein, "Multipurpose Internet Mail
Extensions (MIME) Part One: Format of Internet Message Bodies",
RFC 2045, November 1996.
[RFC2104] - Krawczyk, H., Bellare, M., and R. Canetti, "HMAC: Keyed-
Hashing for Message Authentication", RFC 2104, February 1997.
[RFC2119] - Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
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[RFC2315] - Kaliski, B., "PKCS #7: Cryptographic Message Syntax
Version 1.5", RFC 2315, March 1998.
[RFC3275] - Eastlake 3rd, D., Reagle, J., and D. Solo, "(Extensible
Markup Language) XML-Signature Syntax and Processing", RFC
3275, March 2002.
[RFC3394] - Schaad, J. and R. Housley, "Advanced Encryption Standard
(AES) Key Wrap Algorithm", RFC 3394, September 2002.
[RFC3713] - Matsui, M., Nakajima, J., and S. Moriai, "A Description
of the Camellia Encryption Algorithm", RFC 3713, April 2004.
[RFC3986] - Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66, RFC 3986,
January 2005.
[RFC4050] - Blake-Wilson, S., Karlinger, G., Kobayashi, T., and Y.
Wang, "Using the Elliptic Curve Signature Algorithm (ECDSA) for
XML Digital Signatures", RFC 4050, April 2005.
[RFC4055] - Schaad, J., Kaliski, B., and R. Housley, "Additional
Algorithms and Identifiers for RSA Cryptography for use in the
Internet X.509 Public Key Infrastructure Certificate and
Certificate Revocation List (CRL) Profile", RFC 4055, June
2005.
[RFC4269] - Lee, H., Lee, S., Yoon, J., Cheon, D., and J. Lee, "The
SEED Encryption Algorithm", RFC 4269, December 2005.
[RFC5869] - Krawczyk, H. and P. Eronen, "HMAC-based Extract-and-
Expand Key Derivation Function (HKDF)", RFC 5869, DOI
10.17487/RFC5869, May 2010, <https://www.rfc-
editor.org/info/rfc5869>.
[RFC6234] - Eastlake 3rd, D. and T. Hansen, "US Secure Hash
Algorithms (SHA and SHA-based HMAC and HKDF)", RFC 6234, May
2011.
[RFC7748] - Langley, A., Hamburg, M., and S. Turner, "Elliptic Curves
for Security", RFC 7748, DOI 10.17487/RFC7748, January 2016,
<https://www.rfc-editor.org/info/rfc7748>.
[RFC8017] Moriarty, K., Ed., Kaliski, B., Jonsson, J., and A. Rusch,
"PKCS #1: RSA Cryptography Specifications Version 2.2", RFC
8017, DOI 10.17487/RFC8017, November 2016, <https://www.rfc-
editor.org/info/rfc8017>.
[RFC8032] - Josefsson, S. and I. Liusvaara, "Edwards-Curve Digital
Signature Algorithm (EdDSA)", RFC 8032, DOI 10.17487/RFC8032,
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January 2017, <https://www.rfc-editor.org/info/rfc8032>.
[RFC8126] - Cotton, M., Leiba, B., and T. Narten, "Guidelines for
Writing an IANA Considerations Section in RFCs", BCP 26, RFC
8126, DOI 10.17487/RFC8126, June 2017, <https://www.rfc-
editor.org/info/rfc8126>.
[RFC8174] - Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May
2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8439] - Nir, Y. and A. Langley, "ChaCha20 and Poly1305 for IETF
Protocols", RFC 8439, DOI 10.17487/RFC8439, June 2018,
<https://www.rfc-editor.org/info/rfc8439>.
[SipHash1] - Aumasson, J. and D. Bernstein, "SipHash: A Fast Short-
Input PRF", Progress in Cryptology - INDOCRYPT 2012, Lecture
Notes in Computer Science, vol. 7668, December 2012,
<https://doi.org/10.1007/978-3-642-34931-7_28>.
[X9.62] - American National Standards Institute, Accredited Standards
Committee X9, "Public Key Cryptography for the Financial
Services Industry: The Elliptic Curve Digital Signature
Algorithm (ECDSA)", ANSI X9.62:2005, 2005.
[XMLENC10] - Reagle, J. and D. Eastlake, "XML Encryption Syntax and
Processing", W3C Recommendation, 10 December 2002,
<http://www.w3.org/TR/2002/REC-xmlenc-core-20021210/>.
[XMLENC11] - Eastlake, D., Reagle, J., Hirsch, F., and T. Roessler,
"XML Encryption Syntax and Processing Version 1.1", W3C
Proposed Recommendation, 11 April 2013,
<http://www.w3.org/TR/xmlenc-core1/>.
[XPointer] - Grosso, P., Maler, E., Marsh, J., and N. Walsh,
"XPointer Framework", W3C Recommendation, 25 March 2003,
<http://www.w3.org/TR/2003/ REC-xptr-framework-20030325/>.
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Informational References
[Camellia] - Aoki, K., Ichikawa, T., Matsui, M., Moriai, S.,
Nakajima, J., and T. Tokita, "Camellia: A 128-bit Block Cipher
Suitable for Multiple Platforms - Design and Analysis", in
Selected Areas in Cryptography, 7th Annual International
Workshop, SAC 2000, August 2000, Proceedings, Lecture Notes in
Computer Science 2012, pp. 39-56, Springer-Verlag, 2001.
[CANON10] - Boyer, J., "Canonical XML Version 1.0", W3C
Recommendation, 15 March 2001, <http://www.w3.org/TR/2001/REC-
xml-c14n-20010315>.
[CANON11] - Boyer, J., and G. Marcy, "Canonical XML Version 1.1", W3C
Recommendation, 2 May 2008, <http://www.w3.org/TR/2008/REC-xml-
c14n11-20080502/>.
[ChaCha] - Bernstein, D., "ChaCha, a variant of Salsa20", January
2008, <http://cr.yp.to/chacha/chacha-20080128.pdf>.
[DECRYPT] - Hughes, M., Imamura, T., and H. Maruyama, "Decryption
Transform for XML Signature", W3C Recommendation, 10 December
2002, <http://www.w3.org/TR/2002/ REC-xmlenc-decrypt-20021210>.
[Err3597] - RFC Errata, Errata ID 3597, RFC 6931, <http://www.rfc-
editor.org>.
[Err3965] - RFC Errata, Errata ID 3965, RFC 6931, <http://www.rfc-
editor.org>.
[Err4004] - RFC Errata, Errata ID 4004, RFC 6931, <http://www.rfc-
editor.org>.
[GENERIC] - Nystrom, M. and F. Hirsch, "XML Security Generic Hybrid
Ciphers", W3C Working Group Note, 11 April 2013,
<https://www.w3.org/TR/xmlsec-generic-hybrid/>.
[Keccak] - Bertoni, G., Daeman, J., Peeters, M., and G. Van Assche,
"The KECCAK sponge function family", January 2013,
<http://keccak.noekeon.org>.
[Poly1305] - Bernstein, D., "The Poly1305-AES message-authentication
code", March 2005, <http://cr.yp.to/mac/poly1305-20050329.pdf>.
[RFC3075] - Eastlake 3rd, D., Reagle, J., and D. Solo, "XML-Signature
Syntax and Processing", RFC 3075, March 2001.
[RFC3076] - Boyer, J., "Canonical XML Version 1.0", RFC 3076, March
2001.
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[RFC3092] - Eastlake 3rd, D., Manros, C., and E. Raymond, "Etymology
of "Foo"", RFC 3092, April 1 2001.
[RFC3741] - Boyer, J., Eastlake 3rd, D., and J. Reagle, "Exclusive
XML Canonicalization, Version 1.0", RFC 3741, March 2004.
[RFC4010] - Park, J., Lee, S., Kim, J., and J. Lee, "Use of the SEED
Encryption Algorithm in Cryptographic Message Syntax (CMS)",
RFC 4010, February 2005.
[RFC6090]
- D. McGrew, K. Igoe, M. Salter, "Fundamental Elliptic Curve
Cryptography Algorithms", RFC 6090, February 2011.
- Note RFC Errata numbers 2773, 2774, 2775, 2776, and 2777.
[RFC6151] - Turner, S. and L. Chen, "Updated Security Considerations
for the MD5 Message-Digest and the HMAC-MD5 Algorithms", RFC
6151, March 2011.
[RFC6194] - Polk, T., Chen, L., Turner, S., and P. Hoffman, "Security
Considerations for the SHA-0 and SHA-1 Message-Digest
Algorithms", RFC 6194, March 2011.
[RFC6931] - Eastlake 3rd, D., "Additional XML Security Uniform
Resource Identifiers (URIs)", RFC 6931, April 2013,
<http://www.rfc-editor.org/info/rfc6931>.
[Schema] - Thompson, H., Beech, D., Maloney, M., and N. Mendelsohn,
"XML Schema Part 1: Structures Second Edition", W3C
Recommendation, 28 October 2004,
<http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/>.
- Biron, P. and A. Malhotra, "XML Schema Part 2: Datatypes
Second Edition", W3C Recommendation, 28 October 2004,
<http://www.w3.org/TR/2004/REC-xmlschema-2-20041028/>.
[SipHash2] - Aumasson, J. and D. Bernstein, "SipHash: A Fast Short-
Input PRF", Department of Computer Science, Iniversity of
Illinois at Chicago,
<https://www.aumasson.jp/siphash/siphash.pdf>.
[W3C] - World Wide Web Consortium, <http://www.w3.org>.
[XCANON] - Boyer, J., Eastlake, D., and J. Reagle, "Exclusive XML
Canonicalization Version 1.0", W3C Recommendation, 18 July
2002, <http://www.w3.org/TR/2002/REC-xml-exc-c14n-20020718/>.
[XMLDSIG10] - Eastlake, D., Reagle, J., Solo, D., Hirsch, F., and T.
Roessler, "XML Signature Syntax and Processing (Second
Edition)", W3C Recommendation, 10 June 2008,
<http://www.w3.org/TR/2008/REC-xmldsig-core-20080610/>./
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[XMLDSIG11] - Eastlake, D., Reagle, J., Solo, D., Hirsch, F.,
Nystrom, M., Roessler, T., and K. Yiu, "XML Signature Syntax
and Processing Version 1.1", W3C Proposed Recommendation, 11
April 2013, <http://www.w3.org/TR/xmldsig-core1/>.
[XMLDSIG-PROP] - Hirsch, F., "XML Signature Properties", W3C Proposed
Recommendation, 24 January 2013, <http://www.w3.org/TR/
2013/PR-xmldsig-properties-20130124/>.
[XMLSEC] - Eastlake, D., and K. Niles, "Secure XML: The New Syntax
for Signatures and Encryption", Addison-Wesley (Pearson
Education), 2003, ISBN 0-201-75605-6.
[XMLSECXREF] - Hirsch, F., Roessler, T., and K. Yiu, "XML Security
Algorithm Cross-Reference", W3C Working Group Note, 24 January
2013, <http://www.w3.org/TR/2013/ NOTE-xmlsec-
algorithms-20130124/>.
[XPATH] - Boyer, J., Hughes, M., and J. Reagle, "XML-Signature XPath
Filter 2.0", W3C Recommendation, 8 November 2002,
<http://www.w3.org/TR/2002/ REC-xmldsig-filter2-20021108/>.
- Berglund, A., Boag, S., Chamberlin, D., Fernandez, M., Kay,
M., Robie, J., and J. Simeon, "XML Path Language (XPath) 2.0
(Second Edition)", W3C Recommendation, 14 December 2010,
<http://www.w3.org/TR/2010/REC-xpath20-20101214/>.
[XSLT] - Saxonica, M., "XSL Transformations (XSLT) Version 2.0", W3C
Recommendation, 23 January 2007,
<http://www.w3.org/TR/2007/REC-xslt20-20070123/>.
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Author's Address
Donald E. Eastlake 3rd
Futurewei Technologies, Inc.
2386 Panoramic Circle
Apopka, FL 32703 USA
Phone: +1-508-333-2270
EMail: d3e3e3@gmail.com
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Copyright, Disclaimer, and Additional IPR Provisions
Copyright (c) 2022 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
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