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INTERNET-DRAFT                                    Donald E.





Network Working Group                                    D. Eastlake 3rd
Request for Comments: 4051                         Motorola Laboratories
Expires: March
Category: Standards Track                                     April 2005                                       September 2004


      Additional XML Security URIs
                      ---------- --- -------- ----
                  <draft-eastlake-xmldsig-uri-09.txt>

                         Donald E. Eastlake 3rd Uniform Resource Identifiers (URIs)

Status of This Document
   By submitting this Internet-Draft, I certify that any applicable
   patent or other IPR claims of which I am aware have been disclosed,
   or will be disclosed, and any of which I become aware will be
   disclosed, in accordance with RFC 3668.

   Distribution of this Memo

   This document is unlimited. Comments should be sent
   to the author.  Internet-Drafts are working documents of specifies an Internet standards track protocol for the
   Internet
   Engineering Task Force (IETF), its areas, community, and its working groups.
   Note that other groups may also distribute working documents as
   Internet-Drafts.

   Internet-Drafts are draft documents valid requests discussion and suggestions for a maximum
   improvements.  Please refer to the current edition of six months the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   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 a "work in progress."

   The list status of current Internet-Drafts can be accessed at
   http://www.ietf.org/1id-abstracts.html

   The list this protocol.  Distribution of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html this memo is unlimited.

Copyright Notice

   Copyright (C) 2004 The Internet Society. All Right Reserved. Society (2005).

Abstract

   A number of URIs Uniform Resource Identifiers (URIs) intended for use with
   XML Digital Signatures, Encryption, and Canonnicalization Canonicalization are defined.
   These URIs identify algorithms and types of keying information.


Acknowledgements

   Glenn Adams, Merlin Hughs, Gregor Karlinger, Brian LaMachia, Shiho
   Moriai, Joseph Reagle, Russ Housley, and Joel Halpern.





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Table of Contents

      Status of This Document....................................1
      Abstract...................................................1
      Acknowledgements...........................................1

      Table of Contents..........................................2

   1. Introduction............................................3  Introduction..................................................  2
   2. Algorithms..............................................4
      2.1  Algorithms....................................................  3
       2.1.  DigestMethod Algorithms................................4
      2.1.1 MD5..................................................4
      2.1.2 SHA-224..............................................4
      2.1.3 SHA-384..............................................5
      2.2 Algorithms.................................  3
             2.1.1.  MD5.............................................  3
             2.1.2.  SHA-224.........................................  3
             2.1.3.  SHA-384.........................................  4
       2.2.  SignatureMethod Message Authentication Code Algorithms.5
      2.2.1 HMAC-MD5.............................................5
      2.2.2 Algorithms..  4
             2.2.1.  HMAC-MD5........................................  4
             2.2.2.  HMAC SHA Variations..................................6
      2.2.3 HMAC-RIPEMD160.......................................7
      2.3 Variations.............................  5
             2.2.3.  HMAC-RIPEMD160..................................  6
       2.3.  SignatureMethod Public Key Signature Algorithms........7
      2.3.1 RSA-MD5..............................................7
      2.3.2 RSA-SHA256...........................................8
      2.3.3 RSA-SHA384...........................................8
      2.3.4 RSA-SHA512...........................................9
      2.3.5 RSA-RIPEMD160........................................9
      2.3.6 ECDSA-SHA*...........................................9
      2.3.7 ESIGN-SHA1...........................................9
      2.4 Algorithms.........  6
             2.3.1.  RSA-MD5.........................................  6
             2.3.2.  RSA-SHA256......................................  7
             2.3.3.  RSA-SHA384......................................  7
             2.3.4.  RSA-SHA512......................................  7
             2.3.5.  RSA-RIPEMD160...................................  8
             2.3.6.  ECDSA-SHA*......................................  8
             2.3.7.  ESIGN-SHA1......................................  8
       2.4.  Minimal Canonicalization..............................10
      2.5 Canonicalization................................  9
       2.5.  Transform Algorithms..................................10
      2.5.1 XPointer............................................10
      2.6 Algorithms....................................  9
             2.5.1.  XPointer........................................  9



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       2.6.  EncryptionMethod Algorithms...........................11
      2.6.1 Algorithms............................. 10
             2.6.1.  ARCFOUR Encryption Algorithm........................11
      2.6.2 Algorithm.................... 10
             2.6.2.  Camellia Block Encryption...........................12
      2.6.3 Encryption....................... 10
             2.6.3.  Camellia Key Wrap...................................12
      2.6.4 PSEC-KEM............................................13 Wrap............................... 11
             2.6.4.  PSEC-KEM........................................ 11
   3. KeyInfo................................................13
      3.1  KeyInfo....................................................... 12
       3.1.  PKCS #7 Bag of Certificates and CRLs..................13
      3.2 CRLs.................... 12
       3.2.  Additional RetrievalMethod Type Values................14 Values.................. 12
   4.  IANA Considerations....................................15 Considerations........................................... 13
   5.  Security Considerations................................15
      6. Copyright and Disclaimer...............................15 Considerations....................................... 13
   Acknowledgements.................................................. 13
   Normative References......................................16 References.............................................. 13
   Informative References....................................17

      Authorどヨs Address..........................................19
      Expiration and File Name..................................19




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   Author's Address.................................................. 16
   Full Copyright Statement.......................................... 17

1.  Introduction

   XML Digital Signatures, Canonicalization, and Encryption have been
   standardized by the W3C and by the joint IETF/W3C XMLDSIG working
   group [W3C]. group.
   All of these are now W3C Recommendations and IETF Informational or
   Standards Track documents.  They are available as follows:

   IETF level           W3C REC     Topic
   -----------          -------     -----
   [RFC 3275]
   [RFC3275]  Draft Std [XMLDSIG]   XML Digital Signatures
   [RFC 3076]
   [RFC3076]  Info      [CANON]     Canonical XML
    - - - - - -         [XMLENC]    XML Encryption
   [RFC 3741]
   [RFC3741]  Info      [EXCANON]   Exclusive XML Canonicalization

   All of these standards and recommendations use URIs [RFC 2396] [RFC2396] to
   identify algorithms and keying information types.  This document is
   provides a convenient reference list of URIs and descriptions for
   algorithms in which there is substantial interest interest, but which can not cannot
   or have not been included in the main documents for some reason. documents.  Note in
   particular that raising
   XML digital signature to a Draft Standard in the IETF required remove
   removal of any algorithms for which there was not
   demonstrated interoperability from the main
   standards document. document has not been demonstrated.  This required removal
   of the Minimal Canonicalization algorithm, in which there appears to
   be a continued interest, to be dropped from the standards track
   specification.  It is included here.


























D.

   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].






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2.  Algorithms

   The URI [RFC 2396] [RFC2396] being dropped from the standard due to because of the
   transition from Proposed Standard to Draft Standard 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どヨs standard's namespace.

      http://www.w3.org/2000/09/xmldsig#

   Additional algorithms are given URIs that start with with:

      http://www.w3.org/2001/04/xmldsig-more#

   An "xmldsig-more" URI does not imply any official W3C status for
   these algorithms or identifiers nor does it imply or 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 this
   URI prefix has been given by the W3C.



2.1

2.1.  DigestMethod Algorithms

   These algorithms are usable wherever a DigestMethod element occurs.



2.1.1

2.1.1.  MD5

   Identifier:

      http://www.w3.org/2001/04/xmldsig-more#md5

   The MD5 algorithm [RFC 1321] [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 [RFC 2045] [RFC2405] encoding of this bit string
   viewed as a 16-octet octet stream.



2.1.2

2.1.2.  SHA-224

   Identifier:
      http://www.w3.org/2001/04/xmldsig-more#sha224



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   The SHA-224 algorithm [FIPS 180-2change, RFC 3874] [FIPS-180-2change, RFC3874] takes no explicit
   parameters.  An example of a SHA-224 DigestAlgorithm element is:





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   <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] [RFC2405] encoding of this string viewed
   as a 28-octet stream.  Because it takes roughly the same amount of
   effort to compute a SHA-224 message digest as a SHA-256 digest digest, and
   terseness is usually not a criteria in an XML application,
   consideration should be given to the use of SHA-256 as an
   alternative.



2.1.3

2.1.3.  SHA-384

   Identifier:
      http://www.w3.org/2001/04/xmldsig-more#sha384

   The SHA-384 algorithm [FIPS 180-2] [FIPS-180-2] 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] [RFC2405] encoding of this string viewed
   as a 48-octet stream.  Because it takes roughly the same amount of
   effort to compute a SHA-384 message digest as a SHA-512 digest and
   terseness is usually not a criteria in XML application, consideration
   should be given to the use of SHA-512 as an alternative.



2.2

2.2.  SignatureMethod Message Authentication Code Algorithms

   Note: Some text in this section is duplicated from [RFC 3275] [RFC3275] for the
   convenience of the reader.  RFC 3275 is normative in case of
   conflict.



2.2.1

2.2.1.  HMAC-MD5

   Identifier:
      http://www.w3.org/2001/04/xmldsig-more#hmac-md5

   The HMAC algorithm [RFC 2104] [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


D. element
   is as follows:







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   element is as follows:            April 2005


   <SignatureMethod
      Algorithm="http://www.w3.org/2001/04/xmldsig-more#hmac-md5">
      <HMACOutputLength>112</HMACOutputLength>
   </SignatureMethod>

   The output of the HMAC algorithm is ultimately the output (possibly
   truncated) of the chosen digest algorithm.  This value shall be
   base64
   [RFC 2405] [RFC2405] encoded in the same straightforward fashion as the
   output of the digest algorithms. Example:  For example, the SignatureValue
   element for the HMAC-MD5 digest

      9294727A 3638BB1C 13F48EF8 158BFC9D

   from the test vectors in [RFC 2104] [RFC2104] would be

      kpRyejY4uxwT9I74FYv8nQ==

   Schema Definition:

      <simpleType name="HMACOutputLength">
         <restriction base="integer"> base="integer" />
      </simpleType>

   DTD:

      <!ELEMENT HMACOutputLength (#PCDATA) >

   The Schema Definition and DTD immediately shown above are copied taken from [RFC
   3275].
   [RFC3275].

   Although some cryptographic suspicions have recently been cast on MD5
   for use in signatures such as RSA-MD5 below, this does not effect use
   of MD5 in HMAC.



2.2.2

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
      http://www.w3.org/2001/04/xmldsig-more#hmac-sha512

   SHA-224, SHA-256, SHA-384, and SHA-512 [FIPS 180-2, FIPS 180-2change,
   RFC 3874] [FIPS-180-2, FIPS-180-2change,
   RFC3874] can also be used in HMAC as described in section 2.2.1
   above for
   HMAC-MD5.



D.






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2.2.3            April 2005


2.2.3.  HMAC-RIPEMD160

   Identifier:
      http://www.w3.org/2001/04/xmldsig-more#hmac-ripemd160

   RIPEMD-160 [RIPEMD-160] can also be used in HMAC as described in
   section 2.2.1 above for HMAC-MD5.



2.3

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  The verification key is different from
   and not feasibly derivable from the signing key.



2.3.1

2.3.1.  RSA-MD5

   Identifier:
      http://www.w3.org/2001/04/xmldsig-more#rsa-md5

   This

   RSA-MD5 implies the PKCS#1 v1.5 padding algorithm described in [RFC
   2437].
   [RFC3447].  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
   [RFC 2405]
   [RFC2405] encoding of the octet string computed as per [RFC 2437], [RFC3447],
   section 8.1.1, signature generation for the RSASSA-PKCS1-v1_5
   signature scheme.  As specified in the EMSA-PKCS1-V1_5-ENCODE
   function in [RFC 2437, [RFC3447, section 9.2.1], the value input to the
   signature function MUST contain a pre-pended algorithm object
   identifier for the hash function, but the availability of an ASN.1
   parser and recognition of OIDs is are not required of a signature
   verifier.  The PKCS#1 v1.5 representation appears as:

      CRYPT (PAD (ASN.1 (OID, DIGEST (data))))

   Note that 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


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   designator prefix required in PKCS #1 [RFC 2437], [RFC3447], that is, is:

      hex 30 20 30 0c 06 08 2a 86 48 86 f7 0d 02 05 05 00 04 10



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   This prefix is included to make it easier to facilitate the use of 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.

   Due to increases in computer processor power and advances in
   cryptography, use of RSA-MD5 is NOT RECOMMENDED.



2.3.2

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 [RFC 2437] [RFC3447] as described
   in section 2.3.1 2.3.1, but with the ASN.1 BER SHA-256 algorithm designator
   prefix.  An example of use is is:

   <SignatureMethod
      Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256" />

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 [RFC 2437] [RFC3447] as described
   in section 2.3.1 2.3.1, but with the ASN.1 BER SHA-384 algorithm designator
   prefix.  An example of use is 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 RSA-SHA512
   be used in preference to RSA-SHA384 where possible.







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2.3.4

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 [RFC 2437] [RFC3447] as described
   in section 2.3.1 2.3.1, but with the ASN.1 BER SHA-512 algorithm designator
   prefix.  An example of use is is:

   <SignatureMethod
      Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha512" />



2.3.5




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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 [RFC 2437] [RFC3447], as
   described in section 2.3.1 2.3.1, but with the ASN.1 BER RIPEMD160
   algorithm designator prefix.  An example of use is is:

   <SignatureMethod
     Algorithm="http://www.w3.org/2001/04/xmldsig-more/rsa-ripemd160" />



2.3.6

2.3.6.  ECDSA-SHA*

   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

   The Elliptic Curve Digital Signature Algorithm (ECDSA) [FIPS 186-2] [FIPS-186-2]
   is the elliptic curve analogue of the DSA (DSS) signature method.
   For
   a detailed specifications of on how to use it with SHA hash functions
   and XML Digital Signature, please see [X9.62] and [ECDSA].



2.3.7

2.3.7.  ESIGN-SHA1

   Identifier
      http://www.w3.org/2001/04/xmldsig-more#esign-sha1


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      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

   The ESIGN algorithm specified in [IEEE P1363a] [IEEE-P1363a] 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 is:

   <SignatureMethod
      Algorithm="http://www.w3.org/2001/04/xmldsig-more#esign-sha1" />



2.4







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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 from Proposed Standard [RFC 3075] [RFC3075] to
   Draft Standard [RFC 3275], [RFC3275], Minimal Canonicalization was dropped from
   the standard standards track documents.  However, there is still interest and
   indicates of in
   Minimal Canonicalization, indicating its possible future use for Minimal Canonicalization. use.  For
   its definition, see [RFC 3075], [RFC3075], Section 6.5.1.

   For reference, itどヨs its identifier remains:
      http://www.w3.org/2000/09/xmldsig#minimal



2.5

2.5.  Transform Algorithms

   Note that all CanonicalizationMethod algorithms can also be used as
   Transform
   transform algorithms.



2.5.1

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: is [RFC3092]:

   <Transform
      Algorithm="http://www.w3.org/2001/04/xmldsig-more/xptr">


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      <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 [RFC 3275] [RFC3275] for a same-document
   same document XPointer.



2.6

2.6.  EncryptionMethod Algorithms

   This subsection gives identifiers and information for several
   EncryptionMethod Algorithms.



2.6.1

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どヨs Security's RC4 algorithm.  An example of the
   EncryptionMethod element using ARCFOUR is

   <EncryptionMethod
      Algorithm="http://www.w3.org/2001/04/xmldsig-more#arcfour">
      <KeySize>40<KeySize>
      <KeySize>40</KeySize>
   </EncryptionMethod>

   Note that Arcfour makes use of the generic KeySize parameter
   specified and defined in [XMLENC].





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2.6.2

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 an efficient and secure block cipher with the same
   interface as the AES [Camellia, RFC 3713], RFC3713], that is 128-bit block size
   and 128, 192, and 256 bit key sizes.  In XML Encryption 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:

   <EncryptionMethod
      Algorithm=
      "http://www.w3.org/2001/04/xmldsig-more#camellia128-cbc" />



2.6.3






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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

   The Camellia [Camellia, RFC 3713] RFC3713] key wrap is identical to the AES key
   wrap algorithm [RFC 3394] [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 regardless of the size of the Camellia key
   used in wrapping, called wrapping (called the key encrypting key or KEK. KEK).  The
   implementation of Camellia is OPTIONAL.  However, if it is supported,
   the same implementation guidelines as to of which combinations of KEK size
   and wrapped key size should be required to be supported and which are
   optional to be supported should be followed. followed as for AES.  That is to
   say, if Camellia key wrap is supported, they then wrapping 128-bit keys
   with a 128-bit KEK and wrapping 256-bit keys with a 256-bit KEK are
   REQUIRED and all other combinations are OPTIONAL.

   An example of use is:

   <EncryptionMethod
      Algorithm=
      "http://www.w3.org/2001/04/xmldsig-more#kw-camellia128"


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2.6.4

2.6.4.  PSEC-KEM

   Identifier:
      http://www.w3.org/2001/04/xmldsig-more#psec-kem

   The PSEC-KEM algorithm, specified in [ISO/IEC 18033-2], [ISO/IEC-18033-2], is a key
   encapsulation mechanism using elliptic curve encryption.

   An example of use is:

   <EncryptionMethod
      Algorithm="http://www.w3.org/2001/04/xmlenc#psec-kem">
      <ECParameters>
         <Version>version</Version>
         <FieldID>id</FieldID>
         <Curve>curve</Curve>
         <Base>base</Base>
         <Order>order</Order>
         <Cofactor>cofactor</Cofactor>
      </ECParameters>



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   </EncryptionMethod>

   See [ISO/IEC 18033-2] [ISO/IEC-18033-2] for information on the parameters above.

3.  KeyInfo

   In section 3.1 below a new KeyInfo element child is specified specified, while in
   section 3.2 additional KeyInfo Type values for use in RetrievalMethod
   are specified.



3.1

3.1.  PKCS #7 Bag of Certificates and CRLs

   A PKCS #7 [RFC 2315] [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 [RFC 2405] [RFC2405]
   encoded.  Any signer information present is ignored.  The following
   is a an example, eliding the base64 data:






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   <foo:PKCS7signedData
      xmlns:foo="http://www.w3.org/2001/04/xmldsig-more">
      ...
   </foo:PKCS7signedData>



3.2

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 de-referencing 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  Thus,
   they require a Type attribute because they are not unambiguously
   parseable.

   Identifiers:
      http://www.w3.org/2001/04/xmldsig-more#KeyValue
      http://www.w3.org/2001/04/xmldsig-more#RetrievalMethod
      http://www.w3.org/2001/04/xmldsig-more#KeyName
      http://www.w3.org/2001/04/xmldsig-more#rawX509CRL
      http://www.w3.org/2001/04/xmldsig-more#rawPGPKeyPacket
      http://www.w3.org/2001/04/xmldsig-more#rawSPKISexp
      http://www.w3.org/2001/04/xmldsig-more#PKCS7signedData
      http://www.w3.org/2001/04/xmldsig-more#rawPKCS7signedData


























D.








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4.  IANA Considerations

   None.

   As it is easy for people to construct their own unique URIs [RFC
   2396] and, possible, if appropriate, to [RFC2396]
   and possibly obtain a URI from the W3C, W3C if appropriate, it is not
   intended that any additional
   "http://www.w3.org/2001/04/xmldsig-more#" "http://www.w3.org/2001/04/xmldsig-
   more#" URIs be created beyond those enumerated in this document.
   (W3C Namespace stability rules prohibit the creation of new URIs
   under "http://www.w3.org/2000/09/xmldsig#".)

5.  Security Considerations

   Due to computer speed and cryptographic advances, the use of MD5 as a
   DigestMethod or and the use of MD5 in the RSA-MD5 SignatureMethod is NOT
   RECOMMENDED.  The concerned cryptographic advances concerned do not effect the
   security of HMAC-MD5; however, there is little reason not to go for use one
   of the SHA series of algorithms.



6. Copyright and Disclaimer

   Copyright (C) 2004 The Internet Society.  This document is subject to
   the rights, licenses and restrictions contained in BCP 78 and except
   as set forth therein, the authors retain all their rights.


   This document and the information contained herein are provided on an
   "AS IS" basis

Acknowledgements

   Glenn Adams, Merlin Hughs, Gregor Karlinger, Brian LaMachia, Shiho
   Moriai, Joseph Reagle, Russ Housley, and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
   ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
   INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
   INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
   WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.














D. Eastlake 3rd                                                [Page 15]


INTERNET-DRAFT                              Additional XML Security URIs Joel Halpern.

Normative References

   [Camellia] -         "Camellia: A 128-bit Block Cipher Suitable for
                      Multiple Platforms - Design and Analysis -", K.
                      Aoki, T. Ichikawa, M. Matsui, S. Moriai, J.
                      Nakajima, T. Tokita, 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, Springer-
                      Verlag, 2001.

   [ECDSA] - "ECDSA with XML-Signature Syntax", S.            Blake-Wilson, G. S., Karlinger, T. G., Kobayashi, T.,
                      and Y. Want, January 2004. draft-blake-wilson-
   xmldsig-ecdsa-*.txt

   [FIPS 180-1] - "Secure Hash Standard", (SHA-1) US Federal Information
   Processing Standard, 17 Wang, "Using the Elliptic Curve Signature
                      Algorithm (ECDSA) for XML Digital Signatures", RFC
                      4050, April 1995.

   [FIPS 180-2] - 2005.

   [FIPS-180-2]       "Secure Hash Standard", (SHA-1/256/384/512) US
                      Federal Information Processing Standard, Draft, not yet issued.

   [FIPS 180-2change] - 1 August
                      2002.

   [FIPS-180-2change] "FIPS 180-2, Secure Hash Standard Change Notice
                      1", adds SHA-224 to [FIPS 180-2].

   [FIPS 186-2] - 180-2], 25 February
                      2004.

   [FIPS-186-2]       "Digital Signature Standard", National Institute
                      of Standards and Technology, 2000.

   [IEEE P1363a] -



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   [IEEE-P1363a]      "Standard Specifications for Public Key
                      Cryptography:  Additional Techniques", October
                      2002.

   [ISO/IEC 18033-2] -

   [ISO/IEC-18033-2]  "Information technology -- Security techniques --
                      Encryption algorithms -- Part 3: Asymmetric
                      ciphers", CD, October 2002.

   [RFC 1321] -

   [RFC1321]          Rivest, R., "The MD5 Message-Digest Algorithm", R. Rivest, Algorithm ",
                      RFC 1321, April 1992.

   [RFC 2104] -

   [RFC2104]          Krawczyk, H., Bellare, M., and R. Canetti, "HMAC:
                      Keyed-Hashing for Message Authentication", H.
   Krawczyk, M.  Bellare, R. Canetti, RFC
                      2104, February 1997.

   [RFC 2119] -

   [RFC2119]          Bradner, S., "Key words for use in RFCs to
                      Indicate Requirement Levels", S. Bradner, March BCP 14, RFC 2119,
                      March 1997.

   [RFC 2396] -

   [RFC2396]          Berners-Lee, T., Fielding, R., and L. Masinter,
                      "Uniform Resource Identifiers (URI): Generic
                      Syntax", T.
   Berners-Lee, R. Fielding, L. Masinter, RFC 2396, August 1998.

   [RFC 2405] - "Multipurpose Internet Mail Extensions (MIME) Part One:
   Format of Internet Message Bodies", N. Freed,

   [RFC2405]          Madson, C. and N. Borenstein, Doraswamy, "The ESP DES-CBC
                      Cipher Algorithm With Explicit IV", RFC 2405,
                      November
   1996.

   [RFC 2437] - "PKCS #1: RSA Cryptography Specifications Version 2.0",
   B. Kaliski, J. Staddon, October 1998.


D. Eastlake 3rd                                                [Page 16]


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   [RFC 2315] -

   [RFC2315]          Kaliski, B., "PKCS #7: Cryptographic Message
                      Syntax Version 1.5", B.
   Kaliski, RFC 2315, March 1998.

   [RFC 3075] - "XML-Signature Syntax and Processing", D. Eastlake, J.

   [RFC3075]          Eastlake 3rd, D., Reagle, J., and D. Solo, "XML-
                      Signature Syntax and Processing", RFC 3075, March
                      2001. (RFC 3075 was obsoleted by RFC 3275 but is
                      referenced in this document for its description of
                      Minimal Canonicalization which was dropped in RFC
                      3275.)

   [RFC 3275] - "XML-Signature Syntax and Processing", D. Eastlake, J.

   [RFC3275]          Eastlake 3rd, D., Reagle, J., and D. Solo,
                      "(Extensible Markup Language) XML-Signature Syntax
                      and Processing", RFC 3275, March 2002.

   [RFC 3394] -

   [RFC3394]          Schaad, J. and R. Housley, "Advanced Encryption
                      Standard (AES) Key Wrap Algorithm",
   J. Schaad, R. Housley, RFC 3394,
                      September 2002.

   [RFC 3713] -







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   [RFC3447]          Jonsson, J. and B. Kaliski, "Public-Key
                      Cryptography Standards (PKCS) #1: RSA Cryptography
                      Specifications Version 2.1", RFC 3447, February
                      2003.

   [RFC3713]          Matsui, M., Nakajima, J., and S. Moriai, "A
                      Description of the Camellia Encryption Algorithm", M.
   Matsui, J. Nakajima, S. Moriai,
                      RFC 3713, April 2004.

   [RFC 3874] -

   [RFC3874]          Housley, R., "A 224-bit One-way Hash Function:
                      SHA-224", R. Housley, RFC 3874, September 2004.

   [RIPEMD-160] -       ISO/IEC 10118-3:1998, "Information Technology -
                      Security techniques - Hash-functions - Part3:
                      Dedicated hash- functions", ISO, 1998.

   [X9.62] -            X9.62-200X, "Public Key Cryptography for the
                      Financial Services Industry: The Elliptic Curve
                      Digital Signature Algorithm (ECDSA)", Accredited
                      Standards Committee X9, American National
                      Standards Institute.

   [XMLDSIG]          "XML-Signature Syntax and Processing", D. Eastlake
                      3rd, J. Reagle, & D. Solo, 12 February 2002.
                      <http://www.w3.org/TR/xmldsig-core/>

   [XMLENC] -           "XML Encryption Syntax and Processing", J. Reagle,
                      D.  Eastlake, December 2002.
                      <http://www.w3.org/TR/2001/RED-xmlenc-core-
                      20021210/>

   [XPointer] -         "XML Pointer Language (XPointer) Version 1.0", W3C
                      working draft, Steve DeRose, Eve Maler, Ron Daniel
                      Jr., January 2001.
                      <http://www.w3.org/TR/2001/WD-xptr-20010108>

Informative References

   [CANON] -            "Canonical XML Version 1.0", John Boyer.
                      <http://www.w3.org/TR/2001/REC-xml-c14n-20010315>.

   [EXCANON] -          "Exclusive XML Canonicalization Version 1.0", D.
                      Eastlake, J. Reagle, 18 July 2002.  <http://www.w3.org/TR/REC-xml-
   enc-c14n-20020718/>.

   [RFC 3076] -
                      <http://www.w3.org/TR/REC-xml-enc-c14n-20020718/>.

   [RFC3076]          Boyer, J., "Canonical XML Version 1.0", J. Boyer, RFC 3076,
                      March 2001.



D.




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   [RFC 3092] - "Etymology of どヨFooどヨ", D.            April 2005


   [RFC3092]          Eastlake 3rd, C. D., Manros, C., and E. Raymond, 1 April
                      "Etymology of "Foo"", RFC 3092, 2001.

   [RFC 3741] - "Exclusive XML Canonicalization Version 1.0", J.

   [RFC3741]          Boyer,
   D. J., Eastlake 3rd, D., and J. Reagle,
                      "Exclusive XML Canonicalization, Version 1.0", RFC
                      3741, March 2004.















































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Authorどヨs

Author's Address

   Donald E. Eastlake 3rd
   Motorola Laboratories
   155 Beaver Street
   Milford, MA 01757 USA

   Telephone:

   Phone: +1-508-786-7554 (w)
          +1-508-634-2066 (h)
   EMail: Donald.Eastlake@motorola.com



Expiration


































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Full Copyright Statement

   Copyright (C) The Internet Society (2005).

   This document is subject to the rights, licenses and restrictions
   contained in BCP 78, and File Name except as set forth therein, the authors
   retain all their rights.

   This draft expires document and the information contained herein are provided on an
   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
   ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
   INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
   INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
   WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Intellectual Property

   The IETF takes no position regarding the validity or scope of any
   Intellectual Property Rights or other rights that might be claimed to
   pertain to the implementation or use of the technology described in March 2005.

   Its file name
   this document or the extent to which any license under such rights
   might or might not be available; nor does it represent that it has
   made any independent effort to identify any such rights.  Information
   on the procedures with respect to rights in RFC documents can be
   found in BCP 78 and BCP 79.

   Copies of IPR disclosures made to the IETF Secretariat and any
   assurances of licenses to be made available, or the result of an
   attempt made to obtain a general license or permission for the use of
   such proprietary rights by implementers or users of this
   specification can be obtained from the IETF on-line IPR repository at
   http://www.ietf.org/ipr.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights that may cover technology that may be required to implement
   this standard.  Please address the information to the IETF at ietf-
   ipr@ietf.org.

Acknowledgement

   Funding for the RFC Editor function is draft-eastlake-xmldsig-uri-09.txt


































D. currently provided by the
   Internet Society.







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