One document matched: draft-turner-symmetrickeyformat-00.txt
Network Working Group Sean Turner, IECA
Internet Draft Russ Housley, Vigil Security
Intended Status: Standard Track July 1, 2007
Expires: January 1, 2008
Symmetric Key Package Content Type
draft-turner-symmetrickeyformat-00.txt
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Copyright Notice
Copyright (C) The IETF Trust (2007).
Abstract
This document defines the symmetric key format content type. It is
transport independent. The Cryptographic Message Syntax [RFC3852] can
be used to digitally sign, digest, authenticate, or encrypt this
content type.
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Table of Contents
1. Introduction...................................................2
1.1. Requirements Terminology..................................2
1.2. ASN.1 Syntax Notation.....................................2
2. Symmetric Key Package Content Type.............................3
3. Security Considerations........................................4
4. IANA Considerations............................................4
5. References.....................................................4
5.1. Normative References......................................4
5.2. Non-Normative References..................................4
APPENDIX A: ASN.1 Modules.........................................5
A.1. X.680 ASN.1 Module........................................5
A.2. X.208 ASN.1 Module........................................7
1. Introduction
This document defines the symmetric key format content type. It is
transport independent. The Cryptographic Message Syntax [RFC3852] can
be used to digitally sign, digest, authenticate, or encrypt this
content type.
1.1. Requirements Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
1.2. ASN.1 Syntax Notation
The key package is defined using the '93 ASN.1 [X.680, X.690]. A
module for the '88 [X.208, X.209] and the '93 ASN.1 syntax are
included. They result in the same encoding on the wire.
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2. Symmetric Key Package Content Type
The symmetric key package content type is used to transfer one or
more plaintext symmetric keys from one party to another. A symmetric
key package MAY be encapsulated in one or more CMS protecting content
types.
The symmetric key package content type has the following syntax:
PKCS7-CONTENT-TYPE ::= TYPE-IDENTIFIER
symmetric-key-package PKCS7-CONTENT-TYPE ::=
{ SymmetricKeyPackage IDENTIFIED BY id-ct-KP-sKeyPackage }
id-ct-KP-sKeyPackage OBJECT IDENTIFIER ::= |
{ TBD }
SymmetricKeyPackage ::= SEQUENCE {
version KeyPkgVersion DEFAULT v1,
sKeyPkgAtts [0] SEQUENCE SIZE (1..MAX) OF Attribute OPTIONAL,
sKeys SymmetricKeys }
SymmetricKeys ::= SEQUENCE SIZE (1..MAX) OF OneSymmetricKey
OneSymmetricKey ::= SEQUENCE {
sKeyAttrs SEQUENCE SIZE (1..MAX) OF Attribute OPTIONAL,
sKey OCTET STRING }
KeyPkgVersion ::= INTEGER { v1(1), ... }
The SymmetricKeyPackage fields are used as follows:
- version identifies version of the symmetric key package content
structure. For this version of the specification, the default
value, v1, MUST be used.
- sKeyPkgAttrs optionally provides attributes that apply to all of
the symmetric keys in the package. If an attribute appears here it
MUST not also be included in sKeyAttrs.
- sKeys contains a sequence of OneSymmetricKey values. This
structure is discussed below.
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The OneSymmetricKey fields are used as follows:
- sKeyAttrs optionally provides attributes that apply to one
symmetric key. If an attribute appears here it MUST not also be
included in sKeyPkgAttrs.
- sKey contains the key value encoded as an OCTET STRING.
3. Security Considerations
The symmetric key package contents are not protected. This content
type can be combined with a security protocol to protect the contents
of the package.
4. IANA Considerations
None: All identifiers are already registered. Please remove this
section prior to publication as an RFC.
5. References
5.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[X.208] ITU-T Recommendation X.208: Information Technology - Abstract
Syntax Notation One, 1988.
[X.209] ITU-T Recommendation X.209 Information Technology - ASN.1
encoding rules: Specification of Basic Encoding Rules (BER),
Canonical Encoding Rules (CER) and Distinguished Encoding Rules
(DER), 1988.
[X.680] ITU-T Recommendation X.680: Information Technology - Abstract
Syntax Notation One, 1997.
[X.690] ITU-T Recommendation X.690 Information Technology - ASN.1
encoding rules: Specification of Basic Encoding Rules (BER),
Canonical Encoding Rules (CER) and Distinguished Encoding Rules
(DER), 1997.
5.2. Non-Normative References
[RFC3852] Housley, R., "Cryptographic Message Syntax (CMS)", RFC3852,
July 2004.
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APPENDIX A: ASN.1 Modules
Appendix A.1 provides the normative ASN.1 definitions for the
structures described in this specification using ASN.1 as defined in
X.680. Appendix A.2 provides a module using ASN.1 as defined in
[X.208]. The module in A.2 removes usage of newer ASN.1 features
that provide support for limiting the types of elements that may
appear in certain SEQUENCE and SET constructions. Otherwise, the
modules are compatible in terms of encoded representation, i.e., the
modules are bits-on-the-wire compatible aside from the limitations on
SEQUENCE and SET constituents. A.2 is included as a courtesy to
developers using ASN.1 compilers that do not support current ASN.1.
A.1. X.680 ASN.1 Module
SymmetricKeyPackageModulev1-93 { tbd }
DEFINITIONS IMPLICIT TAGS ::=
BEGIN
-- EXPORTS ALL
-- IMPORTS NOTHING
PKCS7-CONTENT-TYPE ::= TYPE-IDENTIFIER
KeyPackageContentTypes PKCS7-CONTENT-TYPE ::= {
symmetric-key-package |
... -- Expect additional content types --
}
symmetric-key-package PKCS7-CONTENT-TYPE ::=
{ SymmetricKeyPackage IDENTIFIED BY id-ct-KP-sKeyPackage }
id-ct-KP-sKeyPackage OBJECT IDENTIFIER ::=
{ TBD }
SymmetricKeyPackage ::= SEQUENCE {
version KeyPkgVersion DEFAULT v1,
sKeyPkgAttrs [0] SEQUENCE SIZE (1..MAX) OF Attribute OPTIONAL,
sKeys SymmetricKeys }
SymmetricKeys ::= SEQUENCE SIZE (1..MAX) OF OneSymmetricKey
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OneSymmetricKey ::= SEQUENCE {
sKeyAttrs SEQUENCE SIZE (1..MAX) OF Attribute OPTIONAL,
sKey OCTET STRING }
KeyPkgVersion ::= INTEGER { v1(1), ... }
Attribute ::= SEQUENCE {
type ATTRIBUTE.&id ({SupportedAttributes}),
values SET SIZE (1..MAX) OF ATTRIBUTE.&Type
({SupportedAttributes}{@type}) }
SupportedAttributes ATTRIBUTE ::= { ... }
ATTRIBUTE ::= CLASS {
&derivation ATTRIBUTE OPTIONAL,
&Type OPTIONAL,
-- either &Type or &derivation required
&equality-match MATCHING-RULE OPTIONAL,
&ordering-match MATCHING-RULE OPTIONAL,
&substrings-match MATCHING-RULE OPTIONAL,
&single-valued BOOLEAN DEFAULT FALSE,
&collective BOOLEAN DEFAULT FALSE,
-- operational extensions
&no-user-modification BOOLEAN DEFAULT FALSE,
&usage AttributeUsage DEFAULT userApplications,
&id OBJECT IDENTIFIER UNIQUE }
WITH SYNTAX {
[ SUBTYPE OF &derivation ]
[ WITH SYNTAX &Type ]
[ EQUALITY MATCHING RULE &equality-match ]
[ ORDERING MATCHING RULE &ordering-match ]
[ SUBSTRINGS MATCHING RULE &substrings-match ]
[ SINGLE VALUE &single-valued ]
[ COLLECTIVE &collective ]
[ NO USER MODIFICATION &no-user-modification ]
[ USAGE &usage ]
ID &id }
MATCHING-RULE ::= CLASS {
&AssertionType OPTIONAL,
&id OBJECT IDENTIFIER UNIQUE }
WITH SYNTAX {
[ SYNTAX &AssertionType ]
ID &id }
AttributeType ::= ATTRIBUTE.&id
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AttributeValue ::= ATTRIBUTE.&Type
AttributeUsage ::= ENUMERATED {
userApplications (0),
directoryOperation (1),
distributedOperation (2),
dSAOperation (3) }
END
A.2. X.208 ASN.1 Module
SymmetricKeyPackageModulev1-88 { tbd }
DEFINITIONS IMPLICIT TAGS ::=
BEGIN
-- EXPORTS ALL
-- IMPORTS NOTHING
-- Symmetric Key Package Content Type and Object Identifier
id-ct-KP-sKeyPackage OBJECT IDENTIFIER ::=
{ TBD }
SymmetricKeyPackage ::= SEQUENCE {
version KeyPkgVersion DEFAULT v1,
sKeyPkgAttrs [0] SEQUENCE SIZE (1..MAX) OF Attribute OPTIONAL,
sKeys SymmetricKeys }
SymmetricKeys ::= SEQUENCE SIZE (1..MAX) OF OneSymmetricKey
OneSymmetricKey ::= SEQUENCE {
sKeyAttrs SEQUENCE SIZE (1..MAX) OF Attribute OPTIONAL,
sKey OCTET STRING }
KeyPkgVersion ::= INTEGER { v1(1), ... }
Attribute ::= SEQUENCE {
attrType OBJECT IDENTIFIER,
attrValues SET OF AttributeValue }
AttributeValue ::= ANY
END
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Editor's Address
Sean Turner
IECA, Inc.
Email: turners (at) ieca (dot) com
Russ Housley
Vigil Security
Email: housley (at) vigilsec (dot) com
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