Use of RSA Keys with SHA-256 and SHA-512 in the Secure Shell (SSH) Protocol
RFC 8332
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Type |
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RFC - Proposed Standard
(March 2018; No errata)
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Last updated |
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2018-03-19
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Replaces |
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draft-rsa-dsa-sha2-256
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Stream |
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IETF
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Formats |
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plain text
pdf
html
bibtex
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Reviews |
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SECDIR,
GENART
will not review this version
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WG state
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Submitted to IESG for Publication
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Document shepherd |
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Daniel Migault
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Shepherd write-up |
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Show
(last changed 2017-06-01)
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| IESG |
IESG state |
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RFC 8332 (Proposed Standard)
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Consensus Boilerplate |
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Yes
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Telechat date |
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Responsible AD |
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Eric Rescorla
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Send notices to |
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Daniel Migault <daniel.migault@ericsson.com>
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| IANA |
IANA review state |
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IANA OK - Actions Needed
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IANA action state |
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RFC-Ed-Ack
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Internet Engineering Task Force (IETF) D. Bider
Request for Comments: 8332 Bitvise Limited
Updates: 4252, 4253 March 2018
Category: Standards Track
ISSN: 2070-1721
Use of RSA Keys with SHA-256 and SHA-512
in the Secure Shell (SSH) Protocol
Abstract
This memo updates RFCs 4252 and 4253 to define new public key
algorithms for use of RSA keys with SHA-256 and SHA-512 for server
and client authentication in SSH connections.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8332.
Bider Standards Track [Page 1]
RFC 8332 Use of RSA Keys with SHA-256 and SHA-512 March 2018
Copyright Notice
Copyright (c) 2018 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
(https://trustee.ietf.org/license-info) in effect on the date of
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
10, 2008. The person(s) controlling the copyright in some of this
material may not have granted the IETF Trust the right to allow
modifications of such material outside the IETF Standards Process.
Without obtaining an adequate license from the person(s) controlling
the copyright in such materials, this document may not be modified
outside the IETF Standards Process, and derivative works of it may
not be created outside the IETF Standards Process, except to format
it for publication as an RFC or to translate it into languages other
than English.
Table of Contents
1. Overview and Rationale . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Terminology . . . . . . . . . . . . . . . . 3
1.2. Wire Encoding Terminology . . . . . . . . . . . . . . . . 3
2. Public Key Format vs. Public Key Algorithm . . . . . . . . . 3
3. New RSA Public Key Algorithms . . . . . . . . . . . . . . . . 4
3.1. Use for Server Authentication . . . . . . . . . . . . . . 5
3.2. Use for Client Authentication . . . . . . . . . . . . . . 5
3.3. Discovery of Public Key Algorithms Supported by Servers . 6
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
5. Security Considerations . . . . . . . . . . . . . . . . . . . 7
5.1. Key Size and Signature Hash . . . . . . . . . . . . . . . 7
5.2. Transition . . . . . . . . . . . . . . . . . . . . . . . 7
5.3. PKCS #1 v1.5 Padding and Signature Verification . . . . . 7
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.1. Normative References . . . . . . . . . . . . . . . . . . 8
6.2. Informative References . . . . . . . . . . . . . . . . . 8
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 9
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 9
Bider Standards Track [Page 2]
RFC 8332 Use of RSA Keys with SHA-256 and SHA-512 March 2018
1. Overview and Rationale
Secure Shell (SSH) is a common protocol for secure communication on
the Internet. In [RFC4253], SSH originally defined the public key
algorithms "ssh-rsa" for server and client authentication using RSA
with SHA-1, and "ssh-dss" using 1024-bit DSA and SHA-1. These
algorithms are now considered deficient. For US government use, NIST
has disallowed 1024-bit RSA and DSA, and use of SHA-1 for signing
[NIST.800-131A].
This memo updates RFCs 4252 and 4253 to define new public key
algorithms allowing for interoperable use of existing and new RSA
keys with SHA-256 and SHA-512.
1.1. Requirements Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
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