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INTERNET-DRAFT Donald E.Network Working Group D. Eastlake 3rd Request for Comments: 4051 Motorola LaboratoriesExpires: MarchCategory: Standards Track April 2005September 2004Additional XML SecurityURIs ---------- --- -------- ---- <draft-eastlake-xmldsig-uri-09.txt> Donald E. Eastlake 3rdUniform Resource Identifiers (URIs) Status of ThisDocument 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 thisMemo This documentis unlimited. Comments should be sent to the author. Internet-Drafts are working documents ofspecifies an Internet standards track protocol for the InternetEngineering Task Force (IETF), its areas,community, andits working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents validrequests discussion and suggestions fora maximumimprovements. Please refer to the current edition ofsix monthsthe "Internet Official Protocol Standards" (STD 1) for the standardization state andmay 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 liststatus ofcurrent Internet-Drafts can be accessed at http://www.ietf.org/1id-abstracts.html The listthis protocol. Distribution ofInternet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.htmlthis memo is unlimited. Copyright Notice Copyright (C)2004The InternetSociety. All Right Reserved.Society (2005). Abstract A number ofURIsUniform Resource Identifiers (URIs) intended for use with XML Digital Signatures, Encryption, andCanonnicalizationCanonicalization 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. D. Eastlake 3rd [Page 1] INTERNET-DRAFT Additional XML Security URIsTable of ContentsStatus of This Document....................................1 Abstract...................................................1 Acknowledgements...........................................1 Table of Contents..........................................21.Introduction............................................3Introduction.................................................. 2 2.Algorithms..............................................4 2.1Algorithms.................................................... 3 2.1. DigestMethodAlgorithms................................4 2.1.1 MD5..................................................4 2.1.2 SHA-224..............................................4 2.1.3 SHA-384..............................................5 2.2Algorithms................................. 3 2.1.1. MD5............................................. 3 2.1.2. SHA-224......................................... 3 2.1.3. SHA-384......................................... 4 2.2. SignatureMethod Message Authentication CodeAlgorithms.5 2.2.1 HMAC-MD5.............................................5 2.2.2Algorithms.. 4 2.2.1. HMAC-MD5........................................ 4 2.2.2. HMAC SHAVariations..................................6 2.2.3 HMAC-RIPEMD160.......................................7 2.3Variations............................. 5 2.2.3. HMAC-RIPEMD160.................................. 6 2.3. SignatureMethod Public Key SignatureAlgorithms........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 2.4Algorithms......... 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. MinimalCanonicalization..............................10 2.5Canonicalization................................ 9 2.5. TransformAlgorithms..................................10 2.5.1 XPointer............................................10 2.6Algorithms.................................... 9 2.5.1. XPointer........................................ 9 Eastlake 3rd Standards Track [Page 1] RFC 4051 Additional XML Security URIs April 2005 2.6. EncryptionMethodAlgorithms...........................11 2.6.1Algorithms............................. 10 2.6.1. ARCFOUR EncryptionAlgorithm........................11 2.6.2Algorithm.................... 10 2.6.2. Camellia BlockEncryption...........................12 2.6.3Encryption....................... 10 2.6.3. Camellia KeyWrap...................................12 2.6.4 PSEC-KEM............................................13Wrap............................... 11 2.6.4. PSEC-KEM........................................ 11 3.KeyInfo................................................13 3.1KeyInfo....................................................... 12 3.1. PKCS #7 Bag of Certificates andCRLs..................13 3.2CRLs.................... 12 3.2. Additional RetrievalMethod TypeValues................14Values.................. 12 4. IANAConsiderations....................................15Considerations........................................... 13 5. SecurityConsiderations................................15 6. Copyright and Disclaimer...............................15Considerations....................................... 13 Acknowledgements.................................................. 13 NormativeReferences......................................16References.............................................. 13 InformativeReferences....................................17 Authorどヨs Address..........................................19 Expiration and File Name..................................19 D. Eastlake 3rd [Page 2] INTERNET-DRAFT Additional XML Security URIsReferences............................................ 15 Author's Address.................................................. 16 Full Copyright Statement.......................................... 17 1. Introduction XML Digital Signatures, Canonicalization, and Encryption have been standardized by the W3C andbythe joint IETF/W3C XMLDSIG workinggroup [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 documentisprovides a convenient reference list of URIs and descriptions for algorithms in which there is substantialinterestinterest, but whichcan notcannot or have not been included in the maindocuments for some reason.documents. Notein particularthat raising XML digital signature to a Draft Standard in the IETF requiredremoveremoval of any algorithms for whichthere was not demonstratedinteroperability from the main standardsdocument.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]. Eastlake 3rd Standards Track [Page3] INTERNET-DRAFT2] RFC 4051 Additional XML Security URIs April 2005 2. Algorithms The URI[RFC 2396][RFC2396] being dropped from the standarddue tobecause of the transition from Proposed Standard to Draft Standard is included in Section 2.4belowwith its originalhttp://www.w3.org/2000/09/xmldsig#prefix so as to avoid changing the XMLDSIGstandardどヨsstandard's namespace. http://www.w3.org/2000/09/xmldsig# Additional algorithms are given URIs that startwithwith: http://www.w3.org/2001/04/xmldsig-more# An "xmldsig-more" URI does not imply any official W3C status for these algorithms or identifiersnor does it implyor that they are only useful in digital signatures. Currently, dereferencing such URIs may or may not produce a temporary placeholder document. Permission to usethesethis URI prefix has been given by the W3C.2.12.1. DigestMethod Algorithms These algorithms are usable wherever a DigestMethod element occurs.2.1.12.1.1. 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.2.1.22.1.2. SHA-224 Identifier: http://www.w3.org/2001/04/xmldsig-more#sha224D. Eastlake 3rd [Page 4] INTERNET-DRAFT Additional XML Security URIsThe 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: Eastlake 3rd Standards Track [Page 3] RFC 4051 Additional XML Security URIs April 2005 <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-256digestdigest, and terseness is usually not a criteria in an XML application, consideration should be given to the use of SHA-256 as an alternative.2.1.32.1.3. 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.2.22.2. 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.2.2.12.2.1. 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 SignatureMethodD.element is as follows: Eastlake 3rd Standards Track [Page5] INTERNET-DRAFT4] RFC 4051 Additional XML Security URIselement 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"> <restrictionbase="integer">base="integer" /> </simpleType> DTD: <!ELEMENT HMACOutputLength (#PCDATA) > The Schema Definition and DTD immediately shown above arecopiedtaken 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.2.2.22.2.2. 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 2.2.1abovefor HMAC-MD5.D.Eastlake 3rd Standards Track [Page6] INTERNET-DRAFT5] RFC 4051 Additional XML Security URIs2.2.3April 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 2.2.1abovefor HMAC-MD5.2.32.3. SignatureMethod Public Key Signature Algorithms These algorithms are distinguished from those in Section 2.2abovein that they use public key methods.That is to say, theThe verification key is different from and not feasibly derivable from the signing key.2.3.12.3.1. RSA-MD5 Identifier: http://www.w3.org/2001/04/xmldsig-more#rsa-md5ThisRSA-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 OIDsisare 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 ofD. Eastlake 3rd [Page 7] INTERNET-DRAFT Additional XML Security URIsthe data. "prefix" is the ASN.1 BER MD5 algorithm designator prefix required in PKCS #1[RFC 2437],[RFC3447], thatis,is: hex 30 20 30 0c 06 08 2a 86 48 86 f7 0d 02 05 05 00 04 10 Eastlake 3rd Standards Track [Page 6] RFC 4051 Additional XML Security URIs April 2005 This prefix is included tomake it easier tofacilitate 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.2.3.22.3.2. 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 section2.3.12.3.1, but with the ASN.1 BER SHA-256 algorithm designator prefix. An example of useisis: <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 section2.3.12.3.1, but with the ASN.1 BER SHA-384 algorithm designator prefix. An example of useisis: <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 asit doesa SHA-512 message digest, it is suggested thatRSA- SHA512RSA-SHA512 be used in preference to RSA-SHA384 where possible.D. Eastlake 3rd [Page 8] INTERNET-DRAFT Additional XML Security URIs 2.3.42.3.4. 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 section2.3.12.3.1, but with the ASN.1 BER SHA-512 algorithm designator prefix. An example of useisis: <SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha512" />2.3.5Eastlake 3rd Standards Track [Page 7] RFC 4051 Additional XML Security URIs April 2005 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 section2.3.12.3.1, but with the ASN.1 BER RIPEMD160 algorithm designator prefix. An example of useisis: <SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more/rsa-ripemd160" />2.3.62.3.6. 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. Foradetailed specificationsofon how to use it with SHA hash functions and XML Digital Signature, please see [X9.62] and [ECDSA].2.3.72.3.7. ESIGN-SHA1 Identifier http://www.w3.org/2001/04/xmldsig-more#esign-sha1D. Eastlake 3rd [Page 9] INTERNET-DRAFT Additional XML Security URIshttp://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 useisis: <SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#esign-sha1" />2.4Eastlake 3rd Standards Track [Page 8] RFC 4051 Additional XML Security URIs April 2005 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 thestandardstandards track documents. However, there is still interestand indicates ofin Minimal Canonicalization, indicating its possible futureuse for Minimal Canonicalization.use. For its definition, see[RFC 3075],[RFC3075], Section 6.5.1. For reference,itどヨsits identifier remains: http://www.w3.org/2000/09/xmldsig#minimal2.52.5. Transform Algorithms Note that all CanonicalizationMethod algorithms can also be used asTransformtransform algorithms.2.5.12.5.1. XPointer Identifier: http://www.w3.org/2001/04/xmldsig-more/xptr This transform algorithm takes an [XPointer] as an explicit parameter. An example of useis:is [RFC3092]: <Transform Algorithm="http://www.w3.org/2001/04/xmldsig-more/xptr">D. Eastlake 3rd [Page 10] INTERNET-DRAFT Additional XML Security URIs<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). Eastlake 3rd Standards Track [Page 9] RFC 4051 Additional XML Security URIs April 2005 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 asame-documentsame document XPointer.2.62.6. EncryptionMethod Algorithms This subsection gives identifiers and information for several EncryptionMethod Algorithms.2.6.12.6.1. 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 RSASecurityどヨsSecurity'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].D. Eastlake 3rd [Page 11] INTERNET-DRAFT Additional XML Security URIs 2.6.22.6.2. 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 XMLEncryptionEncryption, 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" />2.6.3Eastlake 3rd Standards Track [Page 10] RFC 4051 Additional XML Security URIs April 2005 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 samewhateverregardless of the size of the Camellia key used inwrapping, calledwrapping (called the key encrypting key orKEK.KEK). The implementation of Camellia is OPTIONAL. However, if it is supported, the same implementation guidelinesas toof which combinations of KEK size and wrapped key size should be required to be supported and which are optional to be supported should befollowed.followed as for AES. That is to say, if Camellia key wrap is supported,theythen 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"D. Eastlake 3rd [Page 12] INTERNET-DRAFT Additional XML Security URIs/>2.6.42.6.4. 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> Eastlake 3rd Standards Track [Page 11] RFC 4051 Additional XML Security URIs April 2005 </EncryptionMethod> See[ISO/IEC 18033-2][ISO/IEC-18033-2] for information on the parameters above. 3. KeyInfo In section 3.1belowa new KeyInfo element child isspecifiedspecified, while in section 3.2 additional KeyInfo Type values for use in RetrievalMethod are specified.3.13.1. 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 isaan example, eliding the base64data: D. Eastlake 3rd [Page 13] INTERNET-DRAFT Additional XML Security URIsdata [RFC3092]: <foo:PKCS7signedData xmlns:foo="http://www.w3.org/2001/04/xmldsig-more"> ... </foo:PKCS7signedData>3.23.2. Additional RetrievalMethod Type Values The Type attribute of RetrievalMethod is an optional identifier for the type of data to be retrieved. The result ofde-referencingdereferencing 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.ThusThus, 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#rawPKCS7signedDataD.Eastlake 3rd Standards Track [Page14] INTERNET-DRAFT12] RFC 4051 Additional XML Security URIs April 2005 4. IANA ConsiderationsNone.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 theW3C,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 DigestMethodorand the use of MD5 in the RSA-MD5 SignatureMethod is NOT RECOMMENDED. The concerned cryptographic advancesconcerneddo not effect the security of HMAC-MD5; however, there is little reason not togo foruse 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" basisAcknowledgements Glenn Adams, Merlin Hughs, Gregor Karlinger, Brian LaMachia, Shiho Moriai, Joseph Reagle, Russ Housley, andTHE 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 URIsJoel 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, 17Wang, "Using the Elliptic Curve Signature Algorithm (ECDSA) for XML Digital Signatures", RFC 4050, April1995. [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 [FIPS180-2]. [FIPS 186-2] -180-2], 25 February 2004. [FIPS-186-2] "Digital Signature Standard", National Institute of Standards and Technology, 2000.[IEEE P1363a] -Eastlake 3rd Standards Track [Page 13] RFC 4051 Additional XML Security URIs April 2005 [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-DigestAlgorithm", 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, MarchBCP 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, November1996. [RFC 2437] - "PKCS #1: RSA Cryptography Specifications Version 2.0", B. Kaliski, J. Staddon, October1998.D. Eastlake 3rd [Page 16] INTERNET-DRAFT Additional XML Security URIs [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] -Eastlake 3rd Standards Track [Page 14] RFC 4051 Additional XML Security URIs April 2005 [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.Eastlake 3rd Standards Track [Page17] INTERNET-DRAFT15] RFC 4051 Additional XML Security URIs[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.D. Eastlake 3rd [Page 18] INTERNET-DRAFT Additional XML Security URIs AuthorどヨsAuthor's Address Donald E. Eastlake 3rd Motorola Laboratories 155 Beaver Street Milford, MA 01757 USATelephone:Phone: +1-508-786-7554 (w) +1-508-634-2066 (h) EMail: Donald.Eastlake@motorola.comExpirationEastlake 3rd Standards Track [Page 16] RFC 4051 Additional XML Security URIs April 2005 Full Copyright Statement Copyright (C) The Internet Society (2005). This document is subject to the rights, licenses and restrictions contained in BCP 78, andFile Nameexcept as set forth therein, the authors retain all their rights. Thisdraft expiresdocument 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 inMarch 2005. Its file namethis 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 isdraft-eastlake-xmldsig-uri-09.txt D.currently provided by the Internet Society. Eastlake 3rd Standards Track [Page19]17] ----