The PKCS #8 EncryptedPrivateKeyInfo Media Type

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Last updated 2018-04-02 (latest revision 2017-11-13)
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Network Working Group                                         S. Leonard
Internet-Draft                                             Penango, Inc.
Intended Status: Informational                         November 14, 2017
Expires: May 18, 2018                                                   

             The PKCS #8 EncryptedPrivateKeyInfo Media Type


   This document registers the application/pkcs8-encrypted media type
   for the EncryptedPrivateKeyInfo type of PKCS #8. An instance of this
   media type carries a single encrypted private key, BER-encoded as a
   single EncryptedPrivateKeyInfo value.

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Leonard                    Exp. May 18, 2018                    [Page 1]
Internet-Draft        PKCS #8 Encrypted Media Type         November 2017

1. Definitions

   The key words "SHOULD", "SHOULD NOT", and "RECOMMENDED" in this
   document are to be interpreted as described in [RFC2119].

2. Registration Application

   Type name: application

   Subtype name: pkcs8-encrypted

   Required parameters: None.

   Optional parameters:

    password-mapping: The private key is encrypted with an encryption
     algorithm, which could be a password-based encryption scheme as
     that term is used in PKCS #5 [RFC2898]. Such algorithms take a
     password as input. A "password" is a secret text value (Section 3
     of PKCS #5), but for algorithmic purposes the term "password"
     refers to an octet string (Section 2 of PKCS #5). Therefore, there
     must be some mapping between the text value (which might be user
     input) and the octet string. Section 3 of PKCS #5 recommends "that
     applications follow some common text encoding rules"; it then
     offers, but does not recommend, ASCII and UTF-8.

     While many modern applications support Unicode and Unicode-based
     encodings such as UTF-8 and UTF-16, interchange is still needed
     with private key artifacts that are encrypted with passwords in
     other encodings. Therefore, this parameter specifies the charset
     (see Section 1.3 of [RFC2978]) that a recipient SHOULD attempt
     first, in "reverse", when mapping from a sequence of characters to
     an octet string. This parameter is not cryptographically protected,
     so recipients SHOULD NOT rely on it as the exclusive mapping

     This parameter has similar semantics to the charset parameter from
     text/plain, except that it only applies to the user's input (text
     value) of a password. There is no default value.

     The following special values, which all begin with "*" to
     distinguish them from registered charsets, are defined:
     *pkcs12     = UTF-16LE with U+0000 NULL terminator: PKCS #12-style,
                   see [RFC7292]
     *precis     = PRECIS password profile, i.e., OpaqueString from
                   Section 4 of [RFC7613]: always UTF-8 in Normalization
                   Form C (NFC)
     *precis-XXX = PRECIS profile as named XXX in the IANA PRECIS

Leonard                    Exp. May 18, 2018                    [Page 2]
Internet-Draft        PKCS #8 Encrypted Media Type         November 2017

                   Profiles Registry
     *hex        = hexadecimal input: the input is mapped to 0-9, A-F,
                   and then converted directly to octets. If there are
                   an odd number of hex digits, either the final digit 0
                   is appended, or an error condition is raised. Compare
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