draft-ietf-smime-sha2-07.txt   draft-ietf-smime-sha2-08.txt 
S/MIME WG Sean Turner, IECA S/MIME WG Sean Turner, IECA
Intended Status: Standard Track Intended Status: Standard Track
Expires: March 18, 2009 Expires: March 24, 2009
Using SHA2 Algorithms with Cryptographic Message Syntax Using SHA2 Algorithms with Cryptographic Message Syntax
draft-ietf-smime-sha2-07.txt draft-ietf-smime-sha2-08.txt
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Copyright Notice Copyright Notice
Copyright (C) The IETF Trust (2008). Copyright (C) The IETF Trust (2008).
Abstract Abstract
This document describes the conventions for using the Secure Hash This document describes the conventions for using the Secure Hash
Algorithm (SHA) message digest algorithms (SHA-224, SHA-256, SHA-384, Algorithm (SHA) message digest algorithms (SHA-224, SHA-256, SHA-384,
SHA-512) with the Cryptographic Message Syntax (CMS). It also SHA-512) with the Cryptographic Message Syntax (CMS). It also
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Elliptic Curve DSA (ECDSA) signature algorithms. Elliptic Curve DSA (ECDSA) signature algorithms.
Conventions used in this document Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119]. document are to be interpreted as described in [RFC2119].
Table of Contents Table of Contents
1. Introduction......................................... 2 1. Introduction...................................................2
2. Message Digest Algorithms.............................. 3 2. Message Digest Algorithms......................................3
2.1. SHA-224......................................... 4 2.1. SHA-224...................................................4
2.2. SHA-256......................................... 4 2.2. SHA-256...................................................4
2.3. SHA-384......................................... 4 2.3. SHA-384...................................................4
2.4. SHA-512......................................... 4 2.4. SHA-512...................................................4
3. Signature Algorithms.................................. 5 3. Signature Algorithms...........................................5
3.1. DSA............................................ 5 3.1. DSA.......................................................5
3.2. RSA............................................ 6 3.2. RSA.......................................................6
3.3. ECDSA.......................................... 6 3.3. ECDSA.....................................................6
4. Security Considerations................................ 7 4. Security Considerations........................................7
5. IANA Considerations................................... 7 5. IANA Considerations............................................7
6. References.......................................... 7 6. References.....................................................7
6.1. Normative References.............................. 7 6.1. Normative References......................................7
6.2. Informative References............................ 8 6.2. Informative References....................................8
1. Introduction 1. Introduction
This document specifies the algorithm identifiers and specifies This document specifies the algorithm identifiers and specifies
parameters for the message digest algorithms SHA-224, SHA-256, SHA- parameters for the message digest algorithms SHA-224, SHA-256, SHA-
384, and SHA-512 for use with the Cryptographic Message Syntax (CMS) 384, and SHA-512 for use with the Cryptographic Message Syntax (CMS)
[RFC3852]. The message digest algorithms are defined in [SHS] and [RFC3852]. The message digest algorithms are defined in [SHS] and
reference code is provided in [RFC4634]. reference code is provided in [RFC4634].
This document also specifies the algorithm identifiers and parameters This document also specifies the algorithm identifiers and parameters
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signatureAlgorithm field of SignedData. Also, signature algorithm signatureAlgorithm field of SignedData. Also, signature algorithm
identifiers are located in the SignerInfo signatureAlgorithm field of identifiers are located in the SignerInfo signatureAlgorithm field of
countersignature attributes. countersignature attributes.
Signature values are located in the SignerInfo signature field of Signature values are located in the SignerInfo signature field of
SignedData. Also, signature values are located in the SignerInfo SignedData. Also, signature values are located in the SignerInfo
signature field of countersignature attributes. signature field of countersignature attributes.
3.1. DSA 3.1. DSA
[RFC3370] section 3.1 specifies the conventions for DSA with SHA1 [RFC3370] section 3.1 specifies the conventions for DSA with SHA-1
public key algorithm identifiers, parameters, public keys, and public key algorithm identifiers, parameters, public keys, and
signature values. DSA with SHA2 algorithms uses the same conventions signature values. DSA with SHA2 algorithms uses the same conventions
for these public key algorithm identifiers, parameters, public keys, for these public key algorithm identifiers, parameters, public keys,
and signature values. DSA MAY be used with SHA-224 and SHA-256. and signature values. DSA MAY be used with SHA-224 and SHA-256.
DSA has not been specified with SHA-384 and SHA-512. SHA-384 and DSA has not been specified with SHA-384 and SHA-512. SHA-384 and
SHA-512 are not supported because the maximum bit length of p SHA-512 are not supported because the maximum bit length of p
(specified as L) is 3072 for DSA. For consistent cryptographic (specified as L) is 3072 for DSA. For consistent cryptographic
strength, SHA-384 would be used with DSA where L is 7608, and SHA-512 strength, SHA-384 would be used with DSA where L is 7680, and SHA-512
would be used with DSA where L is 15360. would be used with DSA where L is 15360.
The algorithm identifier for DSA with SHA-224 signature values is: The algorithm identifier for DSA with SHA-224 signature values is:
id-dsa-with-sha224 OBJECT IDENTIFIER ::= { joint-iso-ccitt(2) id-dsa-with-sha224 OBJECT IDENTIFIER ::= { joint-iso-ccitt(2)
country(16) us(840) organization(1) gov(101) csor(3) country(16) us(840) organization(1) gov(101) csor(3)
algorithms(4) id-dsa-with-sha2(3) 1 } algorithms(4) id-dsa-with-sha2(3) 1 }
The algorithm identifier for DSA with SHA-256 signature values is: The algorithm identifier for DSA with SHA-256 signature values is:
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sha512WithRSAEncryption OBJECT IDENTIFIER ::= { iso(1) sha512WithRSAEncryption OBJECT IDENTIFIER ::= { iso(1)
member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-1(1) 13 } member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-1(1) 13 }
When any of these four object identifiers appears within an When any of these four object identifiers appears within an
AlgorithmIdentifier, the parameters MUST be NULL. Implementations AlgorithmIdentifier, the parameters MUST be NULL. Implementations
MUST accept the parameters being absent as well as present. MUST accept the parameters being absent as well as present.
3.3. ECDSA 3.3. ECDSA
[RFC3278] section 2.1 specifies the conventions for ECDSA with SHA1 [RFC3278] section 2.1 specifies the conventions for ECDSA with SHA-1
public key algorithm identifiers, parameters, public keys, and public key algorithm identifiers, parameters, public keys, and
signature values. ECDSA with SHA2 algorithms uses the same signature values. ECDSA with SHA2 algorithms uses the same
conventions for these public key algorithm identifiers, parameters, conventions for these public key algorithm identifiers, parameters,
public keys, and signature values, except that the digestAlgorithm public keys, and signature values, except that the digestAlgorithm
MUST include the corresponding message digest algorithm identifier, MUST include the corresponding message digest algorithm identifier,
and not the sha-1 object identifier. ECDSA MAY be used with SHA-224, and not the sha-1 object identifier. ECDSA MAY be used with SHA-224,
SHA-256, SHA-384, or SHA-512. SHA-256, SHA-384, or SHA-512.
The algorithm identifier for ECDSA with SHA-224 signature values is: The algorithm identifier for ECDSA with SHA-224 signature values is:
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