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RFC 6931 - Additional XML Security Uniform Resource Identifiers


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Internet Engineering Task Force (IETF)                   D. Eastlake 3rd
Request for Comments: 6931                                        Huawei
Obsoletes: 4051                                               April 2013
Category: Standards Track
ISSN: 2070-1721

      Additional XML Security Uniform Resource Identifiers (URIs)

Abstract

   This document expands, updates, and establishes an IANA registry for
   the list of URIs intended for use with XML digital signatures,
   encryption, canonicalization, and key management.  These URIs
   identify algorithms and types of information.  This document
   obsoletes RFC 4051.

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 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6931.

Copyright Notice

   Copyright (c) 2013 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................3
      1.1. Terminology ................................................4
      1.2. Acronyms ...................................................4
   2. Algorithms ......................................................5
      2.1. DigestMethod (Hash) Algorithms .............................5
           2.1.1. MD5 .................................................5
           2.1.2. SHA-224 .............................................6
           2.1.3. SHA-384 .............................................6
           2.1.4. Whirlpool ...........................................6
           2.1.5. New SHA Functions ...................................7
      2.2. SignatureMethod MAC Algorithms .............................7
           2.2.1. HMAC-MD5 ............................................7
           2.2.2. HMAC SHA Variations .................................8
           2.2.3. HMAC-RIPEMD160 ......................................8
      2.3. SignatureMethod Public-Key Signature Algorithms ............9
           2.3.1. RSA-MD5 .............................................9
           2.3.2. RSA-SHA256 .........................................10
           2.3.3. RSA-SHA384 .........................................10
           2.3.4. RSA-SHA512 .........................................10
           2.3.5. RSA-RIPEMD160 ......................................11
           2.3.6. ECDSA-SHA*, ECDSA-RIPEMD160, ECDSA-Whirlpool .......11
           2.3.7. ESIGN-SHA* .........................................12
           2.3.8. RSA-Whirlpool ......................................12
           2.3.9. RSASSA-PSS with Parameters .........................13
           2.3.10. RSASSA-PSS without Parameters .....................14
           2.3.11. RSA-SHA224 ........................................15
      2.4. Minimal Canonicalization ..................................15
      2.5. Transform Algorithms ......................................16
           2.5.1. XPointer ...........................................16
      2.6. EncryptionMethod Algorithms ...............................17
           2.6.1. ARCFOUR Encryption Algorithm .......................17
           2.6.2. Camellia Block Encryption ..........................17
           2.6.3. Camellia Key Wrap ..................................17
           2.6.4. PSEC-KEM ...........................................18
           2.6.5. SEED Block Encryption ..............................19
           2.6.6. SEED Key Wrap ......................................19
   3. KeyInfo ........................................................19
      3.1. PKCS #7 Bag of Certificates and CRLs ......................20
      3.2. Additional RetrievalMethod Type Values ....................20
   4. Indexes ........................................................20
      4.1. Fragment Index ............................................21
      4.2. URI Index .................................................24
   5. Allocation Considerations ......................................27
      5.1. W3C Allocation Considerations .............................27
      5.2. IANA Considerations .......................................28
   6. Security Considerations ........................................28

   7. Acknowledgements ...............................................29
   Appendix A. Changes from RFC 4051 .................................30
   Normative References ..............................................31
   Informative References ............................................33

1.  Introduction

   XML digital signatures, canonicalization, and encryption have been
   standardized by the W3C and by the joint IETF/W3C XMLDSIG working
   group [W3C].  All of these are now W3C Recommendations and some are
   also RFCs.  They are available as follows:

   RFC
   Status            W3C REC      Topic
   -----------       -------      -----

   [RFC3275]         [XMLDSIG10]  XML Digital Signatures
   Draft Standard

   [RFC3076]         [CANON10]    Canonical XML
   Informational

   - - - - - -       [XMLENC10]   XML Encryption 1.0

   [RFC3741]         [XCANON]     Exclusive XML Canonicalization 1.0
   Informational

   All of these documents and recommendations use URIs [RFC3986] to
   identify algorithms and keying information types.  The W3C has
   subsequently produced updated XML Signature 1.1 [XMLDSIG11],
   Canonical XML 1.1 [CANON11], and XML Encryption 1.1 [XMLENC11]
   versions, as well as a new XML Signature Properties specification
   [XMLDSIG-PROP].

   All camel-case element names herein, such as DigestValue, are from
   these documents.

   This document is an updated convenient reference list of URIs and
   corresponding algorithms in which there is expressed interest.  Since
   the previous list [RFC4051] was issued in 2005, significant new
   cryptographic algorithms of interest to XML security, for some of
   which the URI is only specified in this document, have been added.
   This document obsoletes [RFC4051].  All of the URIs appear in the
   indexes in Section 4.  Only the URIs that were added by [RFC4051] or
   this document have a subsection in Section 2 or 3, with the exception
   of Minimal Canonicalization (Section 2.4), for example, use of

   SHA-256 is defined in [XMLENC11] and hence there is no subsection on
   that algorithm here, but its URI is included in the indexes in
   Section 4.

   Specification in this document of the URI representing an algorithm
   does not imply endorsement of the algorithm for any particular
   purpose.  A protocol specification, which this is not, generally
   gives algorithm and implementation requirements for the protocol.
   Security considerations for algorithms are constantly evolving, as
   documented elsewhere.  This specification simply provides some URIs
   and relevant formatting for when those URIs are used.

   Note that progressing XML Digital Signature [RFC3275] along the
   Standards Track required removal of any algorithms from the original
   version [RFC3075] for which there was not demonstrated
   interoperability.  This required removal of the Minimal
   Canonicalization algorithm, in which there appears to be continued
   interest.  The URI for Minimal Canonicalization was included in
   [RFC4051] and is included here.

1.1.  Terminology

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

   This document is not intended to change the algorithm implementation
   requirements of any IETF or W3C document.  Use of [RFC2119]
   terminology is intended to be only such as is already stated or
   implied by other authoritative documents.

1.2.  Acronyms

   The following acronyms are used in this document:

   HMAC - Keyed-Hashing MAC [RFC2104]

   IETF - Internet Engineering Task Force <www.ietf.org>

   MAC - Message Authentication Code

   MD - Message Digest

   NIST - United States National Institute of Standards and Technology
          <www.nist.gov>

   RC - Rivest Cipher

   RSA - Rivest, Shamir, and Adleman

   SHA - Secure Hash Algorithm

   URI - Uniform Resource Identifier [RFC3986]

   W3C - World Wide Web Consortium <www.w3.org>

   XML - eXtensible Markup Language

2.  Algorithms

   The URI [RFC3986] that was dropped from the XML Digital Signature
   standard due to the transition from Proposed Standard to Draft
   Standard [RFC3275] 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's namespace.

   Additional algorithms in [RFC4051] were given URIs that start with

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

   while further algorithms added in this document are given URIs that
   start with

      http://www.w3.org/2007/05/xmldsig-more#

   In addition, for ease of reference, this document includes in the
   indexes in Section 4 many cryptographic algorithm URIs from several
   XML security documents using the namespaces with which they are
   defined in those documents.  For example, 2000/09/xmldsig# for some
   URIs specified in [RFC3275] and 2001/04/xmlenc# for some URIs
   specified in [XMLENC10].

   See also [XMLSECXREF].

2.1.  DigestMethod (Hash) Algorithms

   These algorithms are usable wherever a DigestMethod element occurs.

2.1.1.  MD5

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

   The MD5 algorithm [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 [RFC2045] encoding of this bit string
   viewed as a 16-octet stream.  See [RFC6151] for MD5 security
   considerations.

2.1.2.  SHA-224

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

   The SHA-224 algorithm [FIPS180-4] [RFC6234] takes no explicit
   parameters.  An example of a SHA-224 DigestAlgorithm element is:

   <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] encoding of this string viewed
   as a 28-octet stream.

2.1.3.  SHA-384

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

   The SHA-384 algorithm [FIPS180-4] 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] encoding of this string viewed
   as a 48-octet stream.

2.1.4.  Whirlpool

   Identifier:
      http://www.w3.org/2007/05/xmldsig-more#whirlpool

   The Whirlpool algorithm [10118-3] takes no explicit parameters.  A
   Whirlpool digest is a 512-bit string.  The content of the DigestValue
   element SHALL be the base64 [RFC2045] encoding of this string viewed
   as a 64-octet stream.

2.1.5.  New SHA Functions

   Identifiers:
      http://www.w3.org/2007/05/xmldsig-more#sha3-224
      http://www.w3.org/2007/05/xmldsig-more#sha3-256
      http://www.w3.org/2007/05/xmldsig-more#sha3-384
      http://www.w3.org/2007/05/xmldsig-more#sha3-512

   NIST has recently completed a hash function competition for an
   alternative to the SHA family.  The Keccak-f[1600] algorithm was
   selected [Keccak] [SHA-3].  This hash function is commonly referred
   to as "SHA-3", and this section is a space holder and reservation of
   URIs for future information on Keccak use in XML security.

   A SHA-3 224, 256, 384, and 512 digest is a 224-, 256-, 384-, and
   512-bit string, respectively.  The content of the DigestValue element
   SHALL be the base64 [RFC2045] encoding of this string viewed as a
   28-, 32-, 48-, and 64-octet stream, respectively.

2.2.  SignatureMethod MAC Algorithms

   This section covers SignatureMethod MAC (Message Authentication Code)
   Algorithms.

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

2.2.1.  HMAC-MD5

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

   The HMAC algorithm [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
   element is as follows:

   <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 [RFC2045] encoded in the same straightforward fashion as the
   output of the digest algorithms.  Example: the SignatureValue element
   for the HMAC-MD5 digest

      9294727A 3638BB1C 13F48EF8 158BFC9D

   from the test vectors in [RFC2104] would be

      kpRyejY4uxwT9I74FYv8nQ==

   Schema Definition:

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

   DTD:

      <!ELEMENT HMACOutputLength (#PCDATA) >

   The Schema Definition and DTD immediately above are copied from
   [RFC3275].

   See [RFC6151] for HMAC-MD5 security considerations.

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 [FIPS180-4] [RFC6234] can also
   be used in HMAC as described in Section 2.2.1 above for HMAC-MD5.

2.2.3.  HMAC-RIPEMD160

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

   RIPEMD-160 [10118-3] can also be used in HMAC as described in Section
   2.2.1 above for HMAC-MD5.

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

2.3.1.  RSA-MD5

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

   This implies the PKCS#1 v1.5 padding algorithm described in
   [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
   [RFC2045] encoding of the octet string computed as per [RFC3447],
   Section 8.2.1, signature generation for the RSASSA-PKCS1-v1_5
   signature scheme.  As specified in the EMSA-PKCS1-V1_5-ENCODE
   function in [RFC3447], Section 9.2, 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 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 the data.  "prefix" is the ASN.1 BER MD5 algorithm
   designator prefix required in PKCS #1 [RFC3447], that is,

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

   This prefix is included to make it easier to use 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.

   See [RFC6151] for MD5 security considerations.

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 [RFC3447] as described
   in Section 2.3.1, but with the ASN.1 BER SHA-256 algorithm designator
   prefix.  An example of use 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 [RFC3447] as described
   in Section 2.3.1, but with the ASN.1 BER SHA-384 algorithm designator
   prefix.  An example of use 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 be used in preference to RSA-SHA384 where possible.

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

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

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

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

2.3.6.  ECDSA-SHA*, ECDSA-RIPEMD160, ECDSA-Whirlpool

   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
      http://www.w3.org/2007/05/xmldsig-more#ecdsa-ripemd160
      http://www.w3.org/2007/05/xmldsig-more#ecdsa-whirlpool

   The Elliptic Curve Digital Signature Algorithm (ECDSA) [FIPS180-4] is
   the elliptic curve analogue of the Digital Signature Algorithm (DSA)
   signature method, i.e., the Digital Signature Standard (DSS).  It
   takes no explicit parameters.  For detailed specifications of how to
   use it with SHA hash functions and XML Digital Signature, please see
   [X9.62] and [RFC4050].  The #ecdsa-ripemd160 and #ecdsa-whirlpool
   fragments in the new namespace identifies a signature method
   processed in the same way as specified by the #ecdsa-sha1 fragment of
   this namespace, with the exception that RIPEMD160 or Whirlpool is
   used instead of SHA-1.

   The output of the ECDSA algorithm consists of a pair of integers
   usually referred by the pair (r, s).  The signature value consists of
   the base64 encoding of the concatenation of two octet streams that
   respectively result from the octet-encoding of the values r and s in
   that order.  Conversion from integer to octet stream must be done
   according to the I2OSP operation defined in the [RFC3447]
   specification with the l parameter equal to the size of the base
   point order of the curve in bytes (e.g., 32 for the P-256 curve and
   66 for the P-521 curve [FIPS186-3]).

   For an introduction to elliptic curve cryptographic algorithms, see
   [RFC6090] and note the errata (Errata ID 2773-2777).

2.3.7.  ESIGN-SHA*

   Identifiers:
      http://www.w3.org/2001/04/xmldsig-more#esign-sha1
      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 [IEEEP1363a] 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

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

2.3.8.  RSA-Whirlpool

   Identifier:
      http://www.w3.org/2007/05/xmldsig-more#rsa-whirlpool

   As in the definition of the RSA-SHA1 algorithm in [XMLDSIG11], the
   designator "RSA" means the RSASSA-PKCS1-v1_5 algorithm as defined in
   [RFC3447].  When identified through the #rsa-whirlpool fragment
   identifier, Whirlpool is used as the hash algorithm instead.  Use of
   the ASN.1 BER Whirlpool algorithm designator is implied.  That
   designator is
      hex 30 4e 30 0a 06 06 28 cf 06 03 00 37 05 00 04 40
   as an explicit octet sequence.  This corresponds to OID
   1.0.10118.3.0.55 defined in [10118-3].

   An example of use is

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

2.3.9.  RSASSA-PSS with Parameters

   Identifiers:
      http://www.w3.org/2007/05/xmldsig-more#rsa-pss
      http://www.w3.org/2007/05/xmldsig-more#MGF1

   These identifiers imply the PKCS#1 EMSA-PSS encoding algorithm
   [RFC3447].  The RSASSA-PSS algorithm takes the digest method (hash
   function), a mask generation function, the salt length in bytes
   (SaltLength), and the trailer field as explicit parameters.

   Algorithm identifiers for hash functions specified in XML encryption
   [XMLENC11] [XMLDSIG11] and in Section 2.1 are considered to be valid
   algorithm identifiers for hash functions.  According to [RFC3447],
   the default value for the digest function is SHA-1, but due to the
   discovered weakness of SHA-1 [RFC6194], it is recommended that
   SHA-256 or a stronger hash function be used.  Notwithstanding
   [RFC3447], SHA-256 is the default to be used with these
   SignatureMethod identifiers if no hash function has been specified.

   The default salt length for these SignatureMethod identifiers if the
   SaltLength is not specified SHALL be the number of octets in the hash
   value of the digest method, as recommended in [RFC4055].  In a
   parameterized RSASSA-PSS signature the ds:DigestMethod and the
   SaltLength parameters usually appear.  If they do not, the defaults
   make this equivalent to
   http://www.w3.org/2007/05/xmldsig-more#sha256-rsa-MGF1 (see Section
   2.3.10).  The TrailerField defaults to 1 (0xBC) when omitted.

   Schema Definition (target namespace
   http://www.w3.org/2007/05/xmldsig-more#):

   <xs:element name="RSAPSSParams" type="pss:RSAPSSParamsType">
       <xs:annotation>
           <xs:documentation>
   Top level element that can be used in xs:any namespace="#other"
   wildcard of ds:SignatureMethod content.
           </xs:documentation>
       </xs:annotation>
   </xs:element>
   <xs:complexType name="RSAPSSParamsType">
       <xs:sequence>
           <xs:element ref="ds:DigestMethod" minOccurs="0"/>
           <xs:element name="MaskGenerationFunction"
              type="pss:MaskGenerationFunctionType" minOccurs="0"/>
           <xs:element name="SaltLength" type="xs:int"
              minOccurs="0"/>
           <xs:element name="TrailerField" type="xs:int"
              minOccurs="0"/>
       </xs:sequence>
   </xs:complexType>
   <xs:complexType name="MaskGenerationFunctionType">
       <xs:sequence>
           <xs:element ref="ds:DigestMethod" minOccurs="0"/>
       </xs:sequence>
       <xs:attribute name="Algorithm" type="xs:anyURI"
          default="http://www.w3.org/2007/05/xmldsig-more#MGF1"/>
   </xs:complexType>

2.3.10.  RSASSA-PSS without Parameters

   [RFC3447] currently specifies only one mask generation function MGF1
   based on a hash function.  Although [RFC3447] allows for
   parameterization, the default is to use the same hash function as the
   digest method function.  Only this default approach is supported by
   this section; therefore, the definition of a mask generation function
   type is not needed yet.  The same applies to the trailer field.
   There is only one value (0xBC) specified in [RFC3447].  Hence, this
   default parameter must be used for signature generation.  The default
   salt length is the length of the hash function.

   Identifiers:
      http://www.w3.org/2007/05/xmldsig-more#sha3-224-rsa-MGF1
      http://www.w3.org/2007/05/xmldsig-more#sha3-256-rsa-MGF1
      http://www.w3.org/2007/05/xmldsig-more#sha3-384-rsa-MGF1
      http://www.w3.org/2007/05/xmldsig-more#sha3-512-rsa-MGF1

      http://www.w3.org/2007/05/xmldsig-more#md2-rsa-MGF1
      http://www.w3.org/2007/05/xmldsig-more#md5-rsa-MGF1
      http://www.w3.org/2007/05/xmldsig-more#sha1-rsa-MGF1
      http://www.w3.org/2007/05/xmldsig-more#sha224-rsa-MGF1
      http://www.w3.org/2007/05/xmldsig-more#sha256-rsa-MGF1
      http://www.w3.org/2007/05/xmldsig-more#sha384-rsa-MGF1
      http://www.w3.org/2007/05/xmldsig-more#sha512-rsa-MGF1
      http://www.w3.org/2007/05/xmldsig-more#ripemd128-rsa-MGF1
      http://www.w3.org/2007/05/xmldsig-more#ripemd160-rsa-MGF1
      http://www.w3.org/2007/05/xmldsig-more#whirlpool-rsa-MGF1

   An example of use is

   <SignatureMethod
     Algorithm=
     "http://www.w3.org/2007/05/xmldsig-more#SHA3-256-rsa-MGF1"
   />

2.3.11.  RSA-SHA224

   Identifier:
      http://www.w3.org/2007/05/xmldsig-more#rsa-sha224

   This implies the PKCS#1 v1.5 padding algorithm [RFC3447] as described
   in Section 2.3.1, but with the ASN.1 BER SHA-224 algorithm designator
   prefix.  An example of use is

   <SignatureMethod
      Algorithm="http://www.w3.org/2007/05/xmldsig-more#rsa-sha224" />

   Because it takes about the same effort to calculate a SHA-224 message
   digest as it does a SHA-256 message digest, it is suggested that
   RSA-SHA256 be used in preference to RSA-SHA224 where possible.

2.4.  Minimal Canonicalization

   Thus far, two independent interoperable implementations of Minimal
   Canonicalization have not been announced.  Therefore, when XML
   Digital Signature was advanced along the Standards Track from
   [RFC3075] to [RFC3275], Minimal Canonicalization was dropped.
   However, there is still interest.  For its definition, see Section
   6.5.1 of [RFC3075].

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

2.5.  Transform Algorithms

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

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:

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

   Output from this transform is a node set; the results of the XPointer
   are processed as defined in the XMLDSIG specification [RFC3275] for a
   same-document XPointer.

2.6.  EncryptionMethod Algorithms

   This subsection gives identifiers and information for several
   EncryptionMethod Algorithms.

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's RC4 algorithm [RC4].  An example
   EncryptionMethod element using ARCFOUR is

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

   Note that Arcfour makes use of the generic KeySize parameter
   specified and defined in [XMLENC11].

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 a block cipher with the same interface as the AES
   [Camellia] [RFC3713]; it has a 128-bit block size and 128-, 192-, and
   256-bit key sizes.  In XML 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.  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

   Camellia [Camellia] [RFC3713] key wrap is identical to the AES key
   wrap algorithm [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 the size of the Camellia key used
   in wrapping, called the "key encrypting key" or "KEK".  If Camellia
   is supported, it is particularly suggested that wrapping 128-bit keys
   with a 128-bit KEK and wrapping 256-bit keys with a 256-bit KEK be
   supported.

   An example of use is:

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

2.6.4.  PSEC-KEM

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

   The PSEC-KEM algorithm, specified in [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>
   </EncryptionMethod>

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

2.6.5.  SEED Block Encryption

   Identifier:
      http://www.w3.org/2007/05/xmldsig-more#seed128-cbc

   SEED [RFC4269] is a 128-bit block size with 128-bit key sizes.  In
   XML Encryption, SEED can be 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 SEED EncryptionMethod is as follows:

   <EncryptionMethod
      Algorithm="http://www.w3.org/2007/05/xmldsig-more#seed128-cbc" />

2.6.6.  SEED Key Wrap

   Identifier:
      http://www.w3.org/2007/05/xmldsig-more#kw-seed128

   Key wrapping with SEED is identical to Section 2.2.1 of [RFC3394]
   with "AES" replaced by "SEED".  The algorithm is specified in
   [RFC4010].  The implementation of SEED is optional.  The default
   initial value is 0xA6A6A6A6A6A6A6A6.

   An example of use is:

   <EncryptionMethod
      Algorithm=
      "http://www.w3.org/2007/05/xmldsig-more#kw-seed128"
   />

3.  KeyInfo

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

3.1.  PKCS #7 Bag of Certificates and CRLs

   A PKCS #7 [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 [RFC2045]
   encoded.  Any signer information present is ignored.  The following
   is an example [RFC3092], eliding the base64 data:

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

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 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,
   they require a Type attribute because they are not unambiguously
   parsable.

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

4.  Indexes

   The following subsections provide an index by URI and by fragment
   identifier (the portion of the URI after "#") of the algorithm and
   KeyInfo URIs defined in this document and in the standards (plus the
   one KeyInfo child element name defined in this document).  The
   "Sec/Doc" column has the section of this document or, if not
   specified in this document, the document where the item is specified.
   See also [XMLSECXREF].

4.1.  Fragment Index

   The initial "http://www.w3.org/" part of the URI is not included
   below.  The first six entries have a null fragment identifier or no
   fragment identifier.

   Fragment            URI                                   Sec/Doc
   ---------           ----                                 --------

                       2002/06/xmldsig-filter2                [XPATH]
                       2006/12/xmlc12n11#                   [CANON11]
                       TR/1999/REC-xslt-19991116               [XSLT]
                       TR/1999/REC-xpath-19991116             [XPATH]
                       TR/2001/06/xml-exc-c14n#              [XCANON]
                       TR/2001/REC-xml-c14n-20010315        [CANON10]
                       TR/2001/REC-xmlschema-1-20010502      [Schema]

   aes128-cbc          2001/04/xmlenc#aes128-cbc           [XMLENC11]
   aes128-gcm          2009/xmlenc11#aes128-gcm            [XMLENC11]
   aes192-cbc          2001/04/xmlenc#aes192-cbc           [XMLENC11]
   aes192-gcm          2009/xmlenc11#aes192-gcm            [XMLENC11]
   aes256-cbc          2001/04/xmlenc#aes256-cbc           [XMLENC11]
   aes256-gcm          2009/xmlenc11#aes256-gcm            [XMLENC11]
   arcfour             2001/04/xmldsig-more#arcfour            2.6.1

   base64              2000/09/xmldsig#base64               [RFC3275]

   camellia128-cbc     2001/04/xmldsig-more#camellia128-cbc    2.6.2
   camellia192-cbc     2001/04/xmldsig-more#camellia192-cbc    2.6.2
   camellia256-cbc     2001/04/xmldsig-more#camellia256-cbc    2.6.2
   ConcatKDF           2009/xmlenc11#ConcatKDF             [XMLENC11]

   decrypt#XML         2002/07/decrypt#XML                  [DECRYPT]
   decrypt#Binary      2002/07/decrypt#Binary               [DECRYPT]
   DEREncodedKeyValue  2009/xmldsig11#DEREncodedKeyValue  [XMLDSIG11]
   dh                  2001/04/xmlenc#dh                   [XMLENC11]
   dh-es               2009/xmlenc11#dh-es                 [XMLENC11]
   dsa-sha1            2000/09/xmldsig#dsa-sha1             [RFC3275]
   dsa-sha256          2009/xmldsig11#dsa-sha256          [XMLDSIG11]
   DSAKeyValue         2000/09/xmldsig#DSAKeyValue        [XMLDSIG11]

   ECDH-ES             2009/xmlenc11#ECDH-ES               [XMLENC11]
   ecdsa-ripemd160     2007/05/xmldsig-more#ecdsa-ripemd160    2.3.6
   ecdsa-sha1          2001/04/xmldsig-more#ecdsa-sha1         2.3.6
   ecdsa-sha224        2001/04/xmldsig-more#ecdsa-sha224       2.3.6
   ecdsa-sha256        2001/04/xmldsig-more#ecdsa-sha256       2.3.6
   ecdsa-sha384        2001/04/xmldsig-more#ecdsa-sha384       2.3.6
   ecdsa-sha512        2001/04/xmldsig-more#ecdsa-sha512       2.3.6

   ecdsa-whirlpool     2007/05/xmldsig-more#ecdsa-whirlpool    2.3.5
   ecies-kem           2010/xmlsec-ghc#ecies-kem            [GENERIC]
   ECKeyValue          2009/xmldsig11#ECKeyValue          [XMLDSIG11]
   enveloped-signature 2000/09/xmldsig#enveloped-signature  [RFC3275]
   esign-sha1          2001/04/xmldsig-more#esign-sha1         2.3.7
   esign-sha224        2001/04/xmldsig-more#esign-sha224       2.3.7
   esign-sha256        2001/04/xmldsig-more#esign-sha256       2.3.7
   esign-sha384        2001/04/xmldsig-more#esign-sha384       2.3.7
   esign-sha512        2001/04/xmldsig-more#esign-sha512       2.3.7

   generic-hybrid      2010/xmlsec-ghc#generic-hybrid       [GENERIC]

   hmac-md5            2001/04/xmldsig-more#hmac-md5           2.2.1
   hmac-ripemd160      2001/04/xmldsig-more#hmac-ripemd160     2.2.3
   hmac-sha1           2000/09/xmldsig#hmac-sha1            [RFC3275]
   hmac-sha224         2001/04/xmldsig-more#hmac-sha224        2.2.2
   hmac-sha256         2001/04/xmldsig-more#hmac-sha256        2.2.2
   hmac-sha384         2001/04/xmldsig-more#hmac-sha384        2.2.2
   hmac-sha512         2001/04/xmldsig-more#hmac-sha512        2.2.2

   KeyName             2001/04/xmldsig-more#KeyName            3.2
   KeyValue            2001/04/xmldsig-more#KeyValue           3.2
   kw-aes128           2001/04/xmlenc#kw-aes128            [XMLENC11]
   kw-aes128-pad       2009/xmlenc11#kw-aes-128-pad        [XMLENC11]
   kw-aes192           2001/04/xmlenc#kw-aes192            [XMLENC11]
   kw-aes192-pad       2009/xmlenc11#kw-aes-192-pad        [XMLENC11]
   kw-aes256           2001/04/xmlenc#kw-aes256            [XMLENC11]
   kw-aes256-pad       2009/xmlenc11#kw-aes-256-pad        [XMLENC11]
   kw-camellia128      2001/04/xmldsig-more#kw-camellia128     2.6.3
   kw-camellia192      2001/04/xmldsig-more#kw-camellia192     2.6.3
   kw-camellia256      2001/04/xmldsig-more#kw-camellia256     2.6.3
   kw-seed128          2007/05/xmldsig-more#kw-seed128         2.6.6

   md2-rsa-MGF1        2007/05/xmldsig-more#md2-rsa-MGF1       2.3.10
   md5                 2001/04/xmldsig-more#md5                2.1.1
   md5-rsa-MGF1        2007/05/xmldsig-more#md5-rsa-MGF1       2.3.10
   MGF1                2007/05/xmldsig-more#MGF1               2.3.9
   mgf1sha1            2009/xmlenc11#mgf1sha1              [XMLENC11]
   mgf1sha224          2009/xmlenc11#mgf1sha224            [XMLENC11]
   mgf1sha256          2009/xmlenc11#mgf1sha256            [XMLENC11]
   mgf1sha384          2009/xmlenc11#mgf1sha384            [XMLENC11]
   mgf1sha512          2009/xmlenc11#mgf1sha512            [XMLENC11]
   MgmtData            2000/09/xmldsig#MgmtData           [XMLDSIG11]
   minimal             2000/09/xmldsig#minimal                 2.4

   pbkdf2              2009/xmlenc11#pbkdf2                [XMLENC11]
   PGPData             2000/09/xmldsig#PGPData            [XMLDSIG11]
   PKCS7signedData     2001/04/xmldsig-more#PKCS7signedData    3.1

   PKCS7signedData     2001/04/xmldsig-more#PKCS7signedData    3.2
   psec-kem            2001/04/xmldsig-more#psec-kem           2.6.4

   rawPGPKeyPacket     2001/04/xmldsig-more#rawPGPKeyPacket    3.2
   rawPKCS7signedData  2001/04/xmldsig-more#rawPKCS7signedData 3.2
   rawSPKISexp         2001/04/xmldsig-more#rawSPKISexp        3.2
   rawX509Certificate  2000/09/xmldsig#rawX509Certificate   [RFC3275]
   rawX509CRL          2001/04/xmldsig-more#rawX509CRL         3.2
   RetrievalMethod     2001/04/xmldsig-more#RetrievalMethod    3.2
   ripemd128-rsa-MGF1  2007/05/xmldsig-more#ripemd128-rsa-MGF1 2.3.10
   ripemd160           2001/04/xmlenc#ripemd160            [XMLENC11]
   ripemd160-rsa-MGF1  2007/05/xmldsig-more#ripemd160-rsa-MGF1 2.3.10
   rsa-1_5             2001/04/xmlenc#rsa-1_5              [XMLENC11]
   rsa-md5             2001/04/xmldsig-more#rsa-md5            2.3.1
   rsa-oaep            2009/xmlenc11#rsa-oaep              [XMLENC11]
   rsa-oaep-mgf1p      2001/04/xmlenc#rsa-oaep-mgf1p       [XMLENC11]
   rsa-pss             2007/05/xmldsig-more#rsa-pss            2.3.9
   rsa-ripemd160       2001/04/xmldsig-more#rsa-ripemd160      2.3.5
   rsa-sha1            2000/09/xmldsig#rsa-sha1             [RFC3275]
   rsa-sha224          2007/05/xmldsig-more#rsa-sha224         2.3.11
   rsa-sha256          2001/04/xmldsig-more#rsa-sha256         2.3.2
   rsa-sha384          2001/04/xmldsig-more#rsa-sha384         2.3.3
   rsa-sha512          2001/04/xmldsig-more#rsa-sha512         2.3.4
   rsa-whirlpool       2007/05/xmldsig-more#rsa-whirlpool      2.3.5
   rsaes-kem           2010/xmlsec-ghc#rsaes-kem            [GENERIC]
   RSAKeyValue         2000/09/xmldsig#RSAKeyValue        [XMLDSIG11]

   seed128-cbc         2007/05/xmldsig-more#seed128-cbc        2.6.5
   sha1                2000/09/xmldsig#sha1                 [RFC3275]
   sha1-rsa-MGF1       2007/05/xmldsig-more#sha1-rsa-MGF1      2.3.10
   sha224              2001/04/xmldsig-more#sha224             2.1.2
   sha224-rsa-MGF1     2007/05/xmldsig-more#sha224-rsa-MGF1    2.3.10
   sha256              2001/04/xmlenc#sha256               [XMLENC11]
   sha256-rsa-MGF1     2007/05/xmldsig-more#sha256-rsa-MGF1    2.3.10
   sha3-224            2007/05/xmldsig-more#sha3-224           2.1.5
   sha3-224-rsa-MGF1   2007/05/xmldsig-more#sha3-224-rsa-MGF1  2.3.10
   sha3-256            2007/05/xmldsig-more#sha3-256           2.1.5
   sha3-256-rsa-MGF1   2007/05/xmldsig-more#sha3-256-rsa-MGF1  2.3.10
   sha3-384            2007/05/xmldsig-more#sha3-384           2.1.5
   sha3-384-rsa-MGF1   2007/05/xmldsig-more#sha3-384-rsa-MGF1  2.3.10
   sha3-512            2007/05/xmldsig-more#sha3-512           2.1.5
   sha3-512-rsa-MGF1   2007/05/xmldsig-more#sha3-512-rsa-MGF1  2.3.10
   sha384              2001/04/xmldsig-more#sha384             2.1.3
   sha384-rsa-MGF1     2007/05/xmldsig-more#sha384-rsa-MGF1    2.3.10
   sha512              2001/04/xmlenc#sha512               [XMLENC11]
   sha512-rsa-MGF1     2007/05/xmldsig-more#sha512-rsa-MGF1    2.3.10
   SPKIData            2000/09/xmldsig#SPKIData           [XMLDSIG11]

   tripledes-cbc       2001/04/xmlenc#tripledes-cbc        [XMLENC11]

   whirlpool           2007/05/xmldsig-more#whirlpool          2.1.4
   whirlpool-rsa-MGF1  2007/05/xmldsig-more#whirlpool-rsa-MGF1 2.3.10
   WithComments        2006/12/xmlc14n11#WithComments       [CANON11]
   WithComments        TR/2001/06/xml-exc-c14n#WithComments  [XCANON]
   WithComments        TR/2001/REC-xml-c14n-20010315#WithComments
                                                            [CANON10]

   X509Data            2000/09/xmldsig#X509Data           [XMLDSIG11]
   xptr                2001/04/xmldsig-more#xptr               2.5.1

   The initial "http://www.w3.org/" part of the URI is not included
   above.

4.2.  URI Index

   The initial "http://www.w3.org/" part of the URI is not included
   below.

   URI                                 Sec/Doc   Type
   ----                                --------  -----

   2000/09/xmldsig#base64              [RFC3275]  Transform
   2000/09/xmldsig#DSAKeyValue         [RFC3275]  Retrieval type
   2000/09/xmldsig#dsa-sha1            [RFC3275]  SignatureMethod
   2000/09/xmldsig#enveloped-signature [RFC3275]  Transform
   2000/09/xmldsig#hmac-sha1           [RFC3275]  SignatureMethod
   2000/09/xmldsig#MgmtData            [RFC3275]  Retrieval type
   2000/09/xmldsig#minimal                2.4     Canonicalization
   2000/09/xmldsig#PGPData             [RFC3275]  Retrieval type
   2000/09/xmldsig#rawX509Certificate  [RFC3275]  Retrieval type
   2000/09/xmldsig#rsa-sha1            [RFC3275]  SignatureMethod
   2000/09/xmldsig#RSAKeyValue         [RFC3275]  Retrieval type
   2000/09/xmldsig#sha1                [RFC3275]  DigestAlgorithm
   2000/09/xmldsig#SPKIData            [RFC3275]  Retrieval type
   2000/09/xmldsig#X509Data            [RFC3275]  Retrieval type

   2001/04/xmldsig-more#arcfour           2.6.1   EncryptionMethod
   2001/04/xmldsig-more#camellia128-cbc   2.6.2   EncryptionMethod
   2001/04/xmldsig-more#camellia192-cbc   2.6.2   EncryptionMethod
   2001/04/xmldsig-more#camellia256-cbc   2.6.2   EncryptionMethod
   2001/04/xmldsig-more#ecdsa-sha1        2.3.6   SignatureMethod
   2001/04/xmldsig-more#ecdsa-sha224      2.3.6   SignatureMethod
   2001/04/xmldsig-more#ecdsa-sha256      2.3.6   SignatureMethod
   2001/04/xmldsig-more#ecdsa-sha384      2.3.6   SignatureMethod
   2001/04/xmldsig-more#ecdsa-sha512      2.3.6   SignatureMethod
   2001/04/xmldsig-more#esign-sha1        2.3.7   SignatureMethod

   2001/04/xmldsig-more#esign-sha224      2.3.7   SignatureMethod
   2001/04/xmldsig-more#esign-sha256      2.3.7   SignatureMethod
   2001/04/xmldsig-more#esign-sha384      2.3.7   SignatureMethod
   2001/04/xmldsig-more#esign-sha512      2.3.7   SignatureMethod
   2001/04/xmldsig-more#hmac-md5          2.2.1   SignatureMethod
   2001/04/xmldsig-more#hmac-ripemd160    2.2.3   SignatureMethod
   2001/04/xmldsig-more#hmac-sha224       2.2.2   SignatureMethod
   2001/04/xmldsig-more#hmac-sha256       2.2.2   SignatureMethod
   2001/04/xmldsig-more#hmac-sha384       2.2.2   SignatureMethod
   2001/04/xmldsig-more#hmac-sha512       2.2.2   SignatureMethod
   2001/04/xmldsig-more#KeyName           3.2     Retrieval type
   2001/04/xmldsig-more#KeyValue          3.2     Retrieval type
   2001/04/xmldsig-more#kw-camellia128    2.6.3   EncryptionMethod
   2001/04/xmldsig-more#kw-camellia192    2.6.3   EncryptionMethod
   2001/04/xmldsig-more#kw-camellia256    2.6.3   EncryptionMethod
   2001/04/xmldsig-more#md5               2.1.1   DigestAlgorithm
   2001/04/xmldsig-more#PKCS7signedData   3.2     Retrieval type
   2001/04/xmldsig-more#psec-kem          2.6.4   EncryptionMethod
   2001/04/xmldsig-more#rawPGPKeyPacket   3.2     Retrieval type
   2001/04/xmldsig-more#rawPKCS7signedData 3.2    Retrieval type
   2001/04/xmldsig-more#rawSPKISexp       3.2     Retrieval type
   2001/04/xmldsig-more#rawX509CRL        3.2     Retrieval type
   2001/04/xmldsig-more#RetrievalMethod   3.2     Retrieval type
   2001/04/xmldsig-more#rsa-md5           2.3.1   SignatureMethod
   2001/04/xmldsig-more#rsa-sha256        2.3.2   SignatureMethod
   2001/04/xmldsig-more#rsa-sha384        2.3.3   SignatureMethod
   2001/04/xmldsig-more#rsa-sha512        2.3.4   SignatureMethod
   2001/04/xmldsig-more#rsa-ripemd160     2.3.5   SignatureMethod
   2001/04/xmldsig-more#sha224            2.1.2   DigestAlgorithm
   2001/04/xmldsig-more#sha384            2.1.3   DigestAlgorithm
   2001/04/xmldsig-more#xptr              2.5.1   Transform
   2001/04/xmldsig-more#PKCS7signedData   3.1     KeyInfo child

   2001/04/xmlenc#aes128-cbc          [XMLENC11]  EncryptionMethod
   2001/04/xmlenc#aes192-cbc          [XMLENC11]  EncryptionMethod
   2001/04/xmlenc#aes256-cbc          [XMLENC11]  EncryptionMethod
   2001/04/xmlenc#dh                  [XMLENC11]  AgreementMethod
   2001/04/xmlenc#kw-aes128           [XMLENC11]  EncryptionMethod
   2001/04/xmlenc#kw-aes192           [XMLENC11]  EncryptionMethod
   2001/04/xmlenc#kw-aes256           [XMLENC11]  EncryptionMethod
   2001/04/xmlenc#ripemd160           [XMLENC11]  DigestAlgorithm
   2001/04/xmlenc#rsa-1_5             [XMLENC11]  EncryptionMethod
   2001/04/xmlenc#rsa-oaep-mgf1p      [XMLENC11]  EncryptionMethod
   2001/04/xmlenc#sha256              [XMLENC11]  DigestAlgorithm
   2001/04/xmlenc#sha512              [XMLENC11]  DigestAlgorithm
   2001/04/xmlenc#tripledes-cbc       [XMLENC11]  EncryptionMethod

   2002/06/xmldsig-filter2               [XPATH]  Transform

   2002/07/decrypt#XML                 [DECRYPT]  Transform
   2002/07/decrypt#Binary              [DECRYPT]  Transform

   2006/12/xmlc12n11#                  [CANON11]  Canonicalization
   2006/12/xmlc14n11#WithComments      [CANON11]  Canonicalization

   2007/05/xmldsig-more#ecdsa-ripemd160   2.3.6   SignatureMethod
   2007/05/xmldsig-more#ecdsa-whirlpool   2.3.5   SignatureMethod
   2007/05/xmldsig-more#kw-seed128        2.6.6   EncryptionMethod
   2007/05/xmldsig-more#md2-rsa-MGF1      2.3.10  SignatureMethod
   2007/05/xmldsig-more#md5-rsa-MGF1      2.3.10  SignatureMethod
   2007/05/xmldsig-more#MGF1              2.3.9   SignatureMethod
   2007/05/xmldsig-more#ripemd128-rsa-MGF1 2.3.10 SignatureMethod
   2007/05/xmldsig-more#ripemd160-rsa-MGF1 2.3.10 SignatureMethod
   2007/05/xmldsig-more#rsa-pss           2.3.9   SignatureMethod
   2007/05/xmldsig-more#rsa-sha224        2.3.11  SignatureMethod
   2007/05/xmldsig-more#rsa-whirlpool     2.3.5   SignatureMethod
   2007/05/xmldsig-more#seed128-cbc       2.6.5   EncryptionMethod
   2007/05/xmldsig-more#sha1-rsa-MGF1     2.3.10  SignatureMethod
   2007/05/xmldsig-more#sha224-rsa-MGF1   2.3.10  SignatureMethod
   2007/05/xmldsig-more#sha256-rsa-MGF1   2.3.10  SignatureMethod
   2007/05/xmldsig-more#sha3-224          2.1.5   DigestAlgorithm
   2007/05/xmldsig-more#sha3-224-rsa-MGF1 2.3.10  SignatureMethod
   2007/05/xmldsig-more#sha3-256          2.1.5   DigestAlgorithm
   2007/05/xmldsig-more#sha3-256-rsa-MGF1 2.3.10  SignatureMethod
   2007/05/xmldsig-more#sha3-384          2.1.5   DigestAlgorithm
   2007/05/xmldsig-more#sha3-384-rsa-MGF1 2.3.10  SignatureMethod
   2007/05/xmldsig-more#sha3-512          2.1.5   DigestAlgorithm
   2007/05/xmldsig-more#sha3-512-rsa-MGF1 2.3.10  SignatureMethod
   2007/05/xmldsig-more#sha384-rsa-MGF1   2.3.10  SignatureMethod
   2007/05/xmldsig-more#sha512-rsa-MGF1   2.3.10  SignatureMethod
   2007/05/xmldsig-more#whirlpool         2.1.4   DigestAlgorithm
   2007/05/xmldsig-more#whirlpool-rsa-MGF1 2.3.10 SignatureMethod
   2009/xmlenc11#kw-aes-128-pad       [XMLENC11]  EncryptionMethod
   2009/xmlenc11#kw-aes-192-pad       [XMLENC11]  EncryptionMethod
   2009/xmlenc11#kw-aes-256-pad       [XMLENC11]  EncryptionMethod

   2009/xmldsig11#dsa-sha256         [XMLDSIG11]  SignatureMethod
   2009/xmldsig11#ECKeyValue         [XMLDSIG11]  Retrieval type
   2009/xmldsig11#DEREncodedKeyValue [XMLDSIG11]  Retrieval type

   2009/xmlenc11#aes128-gcm           [XMLENC11]  EncryptionMethod
   2009/xmlenc11#aes192-gcm           [XMLENC11]  EncryptionMethod
   2009/xmlenc11#aes256-gcm           [XMLENC11]  EncryptionMethod
   2009/xmlenc11#ConcatKDF            [XMLENC11]  EncryptionMethod
   2009/xmlenc11#mgf1sha1             [XMLENC11]  SignatureMethod
   2009/xmlenc11#mgf1sha224           [XMLENC11]  SignatureMethod
   2009/xmlenc11#mgf1sha256           [XMLENC11]  SignatureMethod

   2009/xmlenc11#mgf1sha384           [XMLENC11]  SignatureMethod
   2009/xmlenc11#mgf1sha512           [XMLENC11]  SignatureMethod
   2009/xmlenc11#pbkdf2               [XMLENC11]  EncryptionMethod
   2009/xmlenc11#rsa-oaep             [XMLENC11]  EncryptionMethod
   2009/xmlenc11#ECDH-ES              [XMLENC11]  EncryptionMethod
   2009/xmlenc11#dh-es                [XMLENC11]  EncryptionMethod

   2010/xmlsec-ghc#generic-hybrid      [GENERIC]  Generic Hybrid
   2010/xmlsec-ghc#rsaes-kem           [GENERIC]  Generic Hybrid
   2010/xmlsec-ghc#ecies-kem           [GENERIC]  Generic Hybrid

   TR/1999/REC-xpath-19991116            [XPATH]  Transform
   TR/1999/REC-xslt-19991116              [XSLT]  Transform
   TR/2001/06/xml-exc-c14n#             [XCANON]  Canonicalization
   TR/2001/06/xml-exc-c14n#WithComments [XCANON]  Canonicalization
   TR/2001/REC-xml-c14n-20010315       [CANON10]  Canonicalization
   TR/2001/REC-xml-c14n-20010315#WithComments
                                       [CANON10]  Canonicalization
   TR/2001/REC-xmlschema-1-20010502     [Schema]  Transform

   The initial "http://www.w3.org/" part of the URI is not included
   above.

5.  Allocation Considerations

   W3C and IANA allocation considerations are given below.

5.1.  W3C Allocation Considerations

   As it is easy for people to construct their own unique URIs [RFC3986]
   and, if appropriate, to obtain a URI from the W3C, it is not intended
   that any additional "http://www.w3.org/2007/05/xmldsig-more#" URIs be
   created beyond those enumerated in this RFC.  (W3C Namespace
   stability rules prohibit the creation of new URIs under
   "http://www.w3.org/2000/09/xmldsig#" and URIs under
   "http://www.w3.org/2001/04/xmldsig-more#" were frozen with the
   publication of [RFC4051].)

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

5.2.  IANA Considerations

   IANA has established a registry entitled "XML Security URIs".  The
   initial contents correspond to Section 4.2 of this document with each
   section number in the "Sec/Doc" column augmented with a reference to
   this RFC (for example, "2.6.4" means "[RFC6931], Section 2.6.4").

   New entries, including new Types, will be added based on Expert
   Review [RFC5226].  Criterion for inclusion are (1) documentation
   sufficient for interoperability of the algorithm or data type and the
   XML syntax for its representation and use and (2) sufficient
   importance as normally indicated by inclusion in (2a) an approved W3C
   Note, Proposed Recommendation, or Recommendation or (2b) an approved
   IETF Standards Track document.  Typically, the registry will
   reference a W3C or IETF document specifying such XML syntax; that
   document will either contain a more abstract description of the
   algorithm or data type or reference another document with a more
   abstract description.

6.  Security Considerations

   This RFC is concerned with documenting the URIs that designate
   algorithms and some data types used in connection with XML security.
   The security considerations vary widely with the particular
   algorithms, and the general security considerations for XML security
   are outside of the scope of this document but appear in [XMLDSIG11],
   [XMLENC11], [CANON10], [CANON11], and [GENERIC].

   [RFC6151] should be consulted before considering the use of MD5 as a
   DigestMethod or RSA-MD5 as a SignatureMethod.

   See [RFC6194] for SHA-1 security considerations and [RFC6151] for MD5
   security considerations.

   Additional security considerations are given in connection with the
   description of some algorithms in the body of this document.

   Implementers should be aware that cryptographic algorithms become
   weaker with time.  As new cryptoanalysis techniques are developed and
   computing performance improves, the work factor to break a particular
   cryptographic algorithm will reduce.  Therefore, cryptographic
   implementations should be modular, allowing new algorithms to be
   readily inserted.  That is, implementers should be prepared for the
   set of mandatory-to-implement algorithms to change over time.

7.  Acknowledgements

   The contributions to this document by the following people, listed in
   alphabetic order, are gratefully acknowledged: Benoit Claise, Adrian
   Farrel, Stephen Farrell, Ernst Giessmann, Frederick Hirsch, Bjoern
   Hoehrmann, Russ Housley, Satoru Kanno, Charlie Kaufman, Konrad Lanz,
   HwanJin Lee, Barry Leiba, Peter Lipp, Subramanian Moonesamy, Thomas
   Roessler, Hanseong Ryu, Peter Saint-Andre, and Sean Turner.

   The following contributors to [RFC4051], on which this document is
   based, are gratefully acknowledged: Glenn Adams, Merlin Hughs, Gregor
   Karlinger, Brian LaMachia, Shiho Moriai, Joseph Reagle, Russ Housley,
   and Joel Halpern.

Appendix A.  Changes from RFC 4051

   The following changes have been made in RFC 4051 to produce this
   document.

   1.  Updated and added numerous RFC, W3C, and Internet-Draft
       references.

   2.  Added #ecdsa-ripemd160, #whirlpool, #ecdsa-whirlpool,
       #rsa-whirlpool, #seed128-cbc, and #kw-seed128.

   3.  Incorporated RFC 4051 errata [Errata191].

   4.  Added URI and fragment index sections.

   5.  For MD5 and SHA-1, added references to [RFC6151] and [RFC6194].

   5.  Added SHA-3 / Keccak placeholder section including #sha3-224,
       #sha3-256, #sha3-384, and #sha3-512.

   6.  Added RSASSA-PSS sections including #sha3-224-MGF1,
       #sha3-256-MGF1, #sha3-384-MGF1, #sha3-512-MGF1, #md2-rsa-MGF1,
       #md5-rsa-MGF1, #sha1-rsa-MGF1, #sha224-rsa-MGF1,
       #sha256-rsa-MGF1, #sha384-rsa-MGF1, #sha512-rsa-MGF1,
       #ripemd128-rsa-MGF1, #ripemd160-rsa-MGF1, and
       #whirlpool-rsa-MGF1.

   7.  Added new URIs from Canonical XML 1.1 and XML Encryption 1.1
       including: #aes128-gcm, #aes192-gcm, #aes256-gc, #ConcatKDF,
       #pbkdf, #rsa-oaep, #ECDH-ES, and #dh-es.

   8.  Added acronym subsection.

   9.  Added numerous URIs that are specified in W3C XML Security
       documents to the Indexes.  These do not have sections in the body
       of this document -- for example, those for dsa-sha256, mgf1sha*,
       decrypt#XML, and xmldsig-filter2.

   10. Requested establishment of an IANA registry.

   11. Made various editorial changes.

Normative References

   [10118-3]     ISO, "Information technology -- Security techniques --
                 Hash-functions -- Part 3: Dedicated hash-functions",
                 ISO/IEC 10118-3:2004, 2004.

   [18033-2]     ISO, "Information technology -- Security techniques --
                 Encryption algorithms -- Part 3: Asymmetric ciphers",
                 ISO/IEC 18033-2:2010, 2010.

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

   [FIPS180-4]   US National Institute of Science and Technology,
                 "Secure Hash Standard (SHS)", FIPS 180-4, March 2012,
                 <http://csrc.nist.gov/publications/fips/fips180-4/
                 fips-180-4.pdf>.

   [FIPS186-3]   US National Institute of Science and Technology,
                 "Digital Signature Standard (DSS)", FIPS 186-3, June
                 2009, <http://csrc.nist.gov/publications/fips/
                 fips186-3/fips_186-3.pdf>.

   [IEEEP1363a]  IEEE, "Standard Specifications for Public Key
                 Cryptography- Amendment 1: Additional Techniques", IEEE
                 1363a-2004, 2004.

   [RC4]         Schneier, B., "Applied Cryptography: Protocols,
                 Algorithms, and Source Code in C", Second Edition, John
                 Wiley and Sons, New York, NY, 1996.

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

   [RFC2045]     Freed, N. and N. Borenstein, "Multipurpose Internet
                 Mail Extensions (MIME) Part One: Format of Internet
                 Message Bodies", RFC 2045, November 1996.

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

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

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

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

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

   [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", RFC 3713, April
                 2004.

   [RFC3986]     Berners-Lee, T., Fielding, R., and L. Masinter,
                 "Uniform Resource Identifier (URI): Generic Syntax",
                 STD 66, RFC 3986, January 2005.

   [RFC4050]     Blake-Wilson, S., Karlinger, G., Kobayashi, T., and Y.
                 Wang, "Using the Elliptic Curve Signature Algorithm
                 (ECDSA) for XML Digital Signatures", RFC 4050, April
                 2005.

   [RFC4055]     Schaad, J., Kaliski, B., and R. Housley, "Additional
                 Algorithms and Identifiers for RSA Cryptography for use
                 in the Internet X.509 Public Key Infrastructure
                 Certificate and Certificate Revocation List (CRL)
                 Profile", RFC 4055, June 2005.

   [RFC4269]     Lee, H., Lee, S., Yoon, J., Cheon, D., and J. Lee, "The
                 SEED Encryption Algorithm", RFC 4269, December 2005.

   [RFC5226]     Narten, T. and H. Alvestrand, "Guidelines for Writing
                 an IANA Considerations Section in RFCs", BCP 26, RFC
                 5226, May 2008.

   [RFC6234]     Eastlake 3rd, D. and T. Hansen, "US Secure Hash
                 Algorithms (SHA and SHA-based HMAC and HKDF)", RFC
                 6234, May 2011.

   [X9.62]       American National Standards Institute, Accredited
                 Standards Committee X9, "Public Key Cryptography for
                 the Financial Services Industry: The Elliptic Curve
                 Digital Signature Algorithm (ECDSA)", ANSI X9.62:2005,
                 2005.

   [XMLENC10]    Reagle, J. and D. Eastlake, "XML Encryption Syntax and
                 Processing", W3C Recommendation, 10 December 2002,
                 <http://www.w3.org/TR/2002/REC-xmlenc-core-20021210/>.

   [XMLENC11]    Eastlake, D., Reagle, J., Hirsch, F., and T. Roessler,
                 "XML Encryption Syntax and Processing Version 1.1", W3C
                 Proposed Recommendation, 24 January 2013,
                 <http://www.w3.org/TR/2013/PR-xmlenc-core1-20130124/>.

   [XPointer]    Grosso, P., Maler, E., Marsh, J., and N. Walsh,
                 "XPointer Framework", W3C Recommendation, 25 March
                 2003, <http://www.w3.org/TR/2003/
                 REC-xptr-framework-20030325/>.

Informative References

   [CANON10]     Boyer, J., "Canonical XML Version 1.0", W3C
                 Recommendation, 15 March 2001,
                 <http://www.w3.org/TR/2001/REC-xml-c14n-20010315>.

   [CANON11]     Boyer, J., and G. Marcy, "Canonical XML Version 1.1",
                 W3C Recommendation, 2 May 2008,
                 <http://www.w3.org/TR/2008/REC-xml-c14n11-20080502/>.

   [DECRYPT]     Hughes, M., Imamura, T., and H. Maruyama, "Decryption
                 Transform for XML Signature", W3C Recommendation, 10
                 December 2002, <http://www.w3.org/TR/2002/
                 REC-xmlenc-decrypt-20021210>.

   [Errata191]   RFC Errata, Errata ID 191, RFC 4051,
                 <http://www.rfc-editor.org>.

   [GENERIC]     Nystrom, M. and F. Hirsch, "XML Security Generic Hybrid
                 Ciphers", W3C Working Group Note, 24 January 2013,
                 <http://www.w3.org/TR/2013/
                 NOTE-xmlsec-generic-hybrid-20130124/>.

   [Keccak]      Bertoni, G., Daeman, J., Peeters, M., and G. Van
                 Assche, "The KECCAK sponge function family", January
                 2013, <http://keccak.noekeon.org>.

   [RFC3075]     Eastlake 3rd, D., Reagle, J., and D. Solo, "XML-
                 Signature Syntax and Processing", RFC 3075, March 2001.

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

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

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

   [RFC4010]     Park, J., Lee, S., Kim, J., and J. Lee, "Use of the
                 SEED Encryption Algorithm in Cryptographic Message
                 Syntax (CMS)", RFC 4010, February 2005.

   [RFC4051]     Eastlake 3rd, D., "Additional XML Security Uniform
                 Resource Identifiers (URIs)", RFC 4051, April 2005.

   [RFC6090]     McGrew, D., Igoe, K., and M. Salter, "Fundamental
                 Elliptic Curve Cryptography Algorithms", RFC 6090,
                 February 2011.

   [RFC6151]     Turner, S. and L. Chen, "Updated Security
                 Considerations for the MD5 Message-Digest and the HMAC-
                 MD5 Algorithms", RFC 6151, March 2011.

   [RFC6194]     Polk, T., Chen, L., Turner, S., and P. Hoffman,
                 "Security Considerations for the SHA-0 and SHA-1
                 Message-Digest Algorithms", RFC 6194, March 2011.

   [Schema]      Thompson, H., Beech, D., Maloney, M., and N.
                 Mendelsohn, "XML Schema Part 1: Structures Second
                 Edition", W3C Recommendation, 28 October 2004,
                 <http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/>.

                 Biron, P. and A. Malhotra, "XML Schema Part 2:
                 Datatypes Second Edition", W3C Recommendation, 28
                 October 2004,
                 <http://www.w3.org/TR/2004/REC-xmlschema-2-20041028/>.

   [SHA-3]       US National Institute of Science and Technology, "SHA-3
                 WINNER", February 2013, <http://csrc.nist.gov/
                 groups/ST/hash/sha-3/winner_sha-3.html>.

   [W3C]         World Wide Web Consortium, <http://www.w3.org>.

   [XCANON]      Boyer, J., Eastlake, D., and J. Reagle, "Exclusive XML
                 Canonicalization Version 1.0", W3C Recommendation, 18
                 July 2002,
                 <http://www.w3.org/TR/2002/REC-xml-exc-c14n-20020718/>.

   [XMLDSIG10]   Eastlake, D., Reagle, J., Solo, D., Hirsch, F., and T.
                 Roessler, "XML Signature Syntax and Processing (Second
                 Edition)", W3C Recommendation, 10 June 2008,
                 <http://www.w3.org/TR/2008/REC-xmldsig-core-20080610/>.

   [XMLDSIG11]   Eastlake, D., Reagle, J., Solo, D., Hirsch, F.,
                 Nystrom, M., Roessler, T., and K. Yiu, "XML Signature
                 Syntax and Processing Version 1.1", W3C Proposed
                 Recommendation, 24 January 2013,
                 <http://www.w3.org/TR/2013/PR-xmldsig-core1-20130124/>.

   [XMLDSIG-PROP]
                 Hirsch, F., "XML Signature Properties", W3C Proposed
                 Recommendation, 24 January 2013, <http://www.w3.org/TR/
                 2013/PR-xmldsig-properties-20130124/>.

   [XMLSECXREF]  Hirsch, F., Roessler, T., and K. Yiu, "XML Security
                 Algorithm Cross-Reference", W3C Working Group Note, 24
                 January 2013, <http://www.w3.org/TR/2013/
                 NOTE-xmlsec-algorithms-20130124/>.

   [XPATH]       Boyer, J., Hughes, M., and J. Reagle, "XML-Signature
                 XPath Filter 2.0", W3C Recommendation, 8 November 2002,
                 <http://www.w3.org/TR/2002/
                 REC-xmldsig-filter2-20021108/>.

                 Berglund, A., Boag, S., Chamberlin, D., Fernandez, M.,
                 Kay, M., Robie, J., and J. Simeon, "XML Path Language
                 (XPath) 2.0 (Second Edition)", W3C Recommendation, 14
                 December 2010,
                 <http://www.w3.org/TR/2010/REC-xpath20-20101214/>.

   [XSLT]        Saxonica, M., "XSL Transformations (XSLT) Version 2.0",
                 W3C Recommendation, 23 January 2007,
                 <http://www.w3.org/TR/2007/REC-xslt20-20070123/>.

Author's Address

   Donald E. Eastlake, 3rd
   Huawei Technologies
   155 Beaver Street
   Milford, MA  01757
   USA

   Phone: +1-508-333-2270
   EMail: d3e3e3@gmail.com

 

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