rfc2898.txt

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   RC5-CBC-Parameters ::= SEQUENCE {
       version INTEGER {v1-0(16)} (v1-0),
       rounds INTEGER (8..127),
       blockSizeInBits INTEGER (64 | 128),
       iv OCTET STRING OPTIONAL }




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   The fields of type RC5-CBC-Parameters have the following meanings:

   -  version is the version of the algorithm, which shall be v1-0.

   -  rounds is the number of rounds in the encryption operation, which
      shall be between 8 and 127.

   -  blockSizeInBits is the block size in bits, which shall be 64 or
      128.

   -  iv is the initialization vector, an eight-octet string for 64-bit
      RC5 and a 16-octet string for 128-bit RC5. The default is a string
      of the appropriate length consisting of zero octets.

B.3 Message Authentication Schemes

   An example message authentication scheme for PBMAC1 (Section 7.1) is
   HMAC-SHA-1.

B.3.1 HMAC-SHA-1

   HMAC-SHA-1 is the HMAC message authentication scheme [7] based on the
   SHA-1 hash function [18]. HMAC-SHA-1 has a variable key length and a
   20-octet (160-bit) message authentication code.

   The object identifier id-hmacWithSHA1 (see Appendix B.1.1) identifies
   the HMAC-SHA-1 message authentication scheme. (The object identifier
   is the same for both the pseudorandom function and the message
   authentication scheme; the distinction is to be understood by
   context.) This object identifier is intended to be employed in the
   object set PBMAC1-Macs (Appendix A.5).

C. ASN.1 Module

   For reference purposes, the ASN.1 syntax in the preceding sections is
   presented as an ASN.1 module here.

   -- PKCS #5 v2.0 ASN.1 Module
   -- Revised March 25, 1999

   -- This module has been checked for conformance with the
   -- ASN.1 standard by the OSS ASN.1 Tools

   PKCS5v2-0 {iso(1) member-body(2) us(840) rsadsi(113549)
       pkcs(1) pkcs-5(5) modules(16) pkcs5v2-0(1)}

   DEFINITIONS ::= BEGIN




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   -- Basic object identifiers

   rsadsi OBJECT IDENTIFIER ::= {iso(1) member-body(2) us(840) 113549}
   pkcs OBJECT IDENTIFIER ::= {rsadsi 1}

   pkcs-5 OBJECT IDENTIFIER ::= {pkcs 5}

   -- Basic types and classes

   AlgorithmIdentifier { ALGORITHM-IDENTIFIER:InfoObjectSet } ::=
     SEQUENCE {
       algorithm ALGORITHM-IDENTIFIER.&id({InfoObjectSet}),
       parameters ALGORITHM-IDENTIFIER.&Type({InfoObjectSet}
       {@algorithm}) OPTIONAL
   }

   ALGORITHM-IDENTIFIER ::= TYPE-IDENTIFIER

   -- PBKDF2

   PBKDF2Algorithms ALGORITHM-IDENTIFIER ::=
       { {PBKDF2-params IDENTIFIED BY id-PBKDF2}, ...}

   id-PBKDF2 OBJECT IDENTIFIER ::= {pkcs-5 12}

   algid-hmacWithSHA1 AlgorithmIdentifier {{PBKDF2-PRFs}} ::=
       {algorithm id-hmacWithSHA1, parameters NULL : NULL}

   PBKDF2-params ::= SEQUENCE {
       salt CHOICE {
         specified OCTET STRING,
         otherSource AlgorithmIdentifier {{PBKDF2-SaltSources}}
       },
       iterationCount INTEGER (1..MAX),
       keyLength INTEGER (1..MAX) OPTIONAL,
       prf AlgorithmIdentifier {{PBKDF2-PRFs}} DEFAULT
       algid-hmacWithSHA1
   }

   PBKDF2-SaltSources ALGORITHM-IDENTIFIER ::= { ... }

   PBKDF2-PRFs ALGORITHM-IDENTIFIER ::=
       { {NULL IDENTIFIED BY id-hmacWithSHA1}, ... }

   -- PBES1


   PBES1Algorithms ALGORITHM-IDENTIFIER ::= {



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       {PBEParameter IDENTIFIED BY pbeWithMD2AndDES-CBC}  |
       {PBEParameter IDENTIFIED BY pbeWithMD2AndRC2-CBC}  |
       {PBEParameter IDENTIFIED BY pbeWithMD5AndDES-CBC}  |
       {PBEParameter IDENTIFIED BY pbeWithMD5AndRC2-CBC}  |
       {PBEParameter IDENTIFIED BY pbeWithSHA1AndDES-CBC} |
       {PBEParameter IDENTIFIED BY pbeWithSHA1AndRC2-CBC},
       ...
   }

   pbeWithMD2AndDES-CBC OBJECT IDENTIFIER ::= {pkcs-5 1}
   pbeWithMD2AndRC2-CBC OBJECT IDENTIFIER ::= {pkcs-5 4}
   pbeWithMD5AndDES-CBC OBJECT IDENTIFIER ::= {pkcs-5 3}
   pbeWithMD5AndRC2-CBC OBJECT IDENTIFIER ::= {pkcs-5 6}
   pbeWithSHA1AndDES-CBC OBJECT IDENTIFIER ::= {pkcs-5 10}
   pbeWithSHA1AndRC2-CBC OBJECT IDENTIFIER ::= {pkcs-5 11}

   PBEParameter ::= SEQUENCE {
       salt OCTET STRING (SIZE(8)),
       iterationCount INTEGER
   }

   -- PBES2

   PBES2Algorithms ALGORITHM-IDENTIFIER ::=
       { {PBES2-params IDENTIFIED BY id-PBES2}, ...}

   id-PBES2 OBJECT IDENTIFIER ::= {pkcs-5 13}

   PBES2-params ::= SEQUENCE {
       keyDerivationFunc AlgorithmIdentifier {{PBES2-KDFs}},
       encryptionScheme AlgorithmIdentifier {{PBES2-Encs}}
   }

   PBES2-KDFs ALGORITHM-IDENTIFIER ::=
       { {PBKDF2-params IDENTIFIED BY id-PBKDF2}, ... }

   PBES2-Encs ALGORITHM-IDENTIFIER ::= { ... }

   -- PBMAC1

   PBMAC1Algorithms ALGORITHM-IDENTIFIER ::=
       { {PBMAC1-params IDENTIFIED BY id-PBMAC1}, ...}

   id-PBMAC1 OBJECT IDENTIFIER ::= {pkcs-5 14}

   PBMAC1-params ::=  SEQUENCE {
       keyDerivationFunc AlgorithmIdentifier {{PBMAC1-KDFs}},
       messageAuthScheme AlgorithmIdentifier {{PBMAC1-MACs}}



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   }

   PBMAC1-KDFs ALGORITHM-IDENTIFIER ::=
       { {PBKDF2-params IDENTIFIED BY id-PBKDF2}, ... }

   PBMAC1-MACs ALGORITHM-IDENTIFIER ::= { ... }

   -- Supporting techniques

   digestAlgorithm OBJECT IDENTIFIER     ::= {rsadsi 2}
   encryptionAlgorithm OBJECT IDENTIFIER ::= {rsadsi 3}

   SupportingAlgorithms ALGORITHM-IDENTIFIER ::= {
       {NULL IDENTIFIED BY id-hmacWithSHA1} |
       {OCTET STRING (SIZE(8)) IDENTIFIED BY desCBC} |
       {OCTET STRING (SIZE(8)) IDENTIFIED BY des-EDE3-CBC} |
       {RC2-CBC-Parameter IDENTIFIED BY rc2CBC} |
       {RC5-CBC-Parameters IDENTIFIED BY rc5-CBC-PAD},
       ...
   }

   id-hmacWithSHA1 OBJECT IDENTIFIER ::= {digestAlgorithm 7}

   desCBC OBJECT IDENTIFIER ::=
       {iso(1) identified-organization(3) oiw(14) secsig(3)
        algorithms(2) 7} -- from OIW

   des-EDE3-CBC OBJECT IDENTIFIER ::= {encryptionAlgorithm 7}

   rc2CBC OBJECT IDENTIFIER ::= {encryptionAlgorithm 2}

   RC2-CBC-Parameter ::= SEQUENCE {
       rc2ParameterVersion INTEGER OPTIONAL,
       iv OCTET STRING (SIZE(8))
   }

   rc5-CBC-PAD OBJECT IDENTIFIER ::= {encryptionAlgorithm 9}

   RC5-CBC-Parameters ::= SEQUENCE {
       version INTEGER {v1-0(16)} (v1-0),
       rounds INTEGER (8..127),
       blockSizeInBits INTEGER (64 | 128),
       iv OCTET STRING OPTIONAL
   }

   END





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Intellectual Property Considerations

   RSA Security makes no patent claims on the general constructions
   described in this document, although specific underlying techniques
   may be covered. Among the underlying techniques, the RC5 encryption
   algorithm (Appendix B.2.4) is protected by U.S. Patents 5,724,428
   [22] and 5,835,600 [23].

   RC2 and RC5 are trademarks of RSA Security.

   License to copy this document is granted provided that it is
   identified as RSA Security Inc. Public-Key Cryptography Standards
   (PKCS) in all material mentioning or referencing this document.

   RSA Security makes no representations regarding intellectual property
   claims by other parties. Such determination is the responsibility of
   the user.

Revision history

   Versions 1.0-1.3

      Versions 1.0-1.3 were distributed to participants in RSA Data
      Security Inc.'s Public-Key Cryptography Standards meetings in
      February and March 1991.

   Version 1.4

      Version 1.4 was part of the June 3, 1991 initial public release of
      PKCS. Version 1.4 was published as NIST/OSI Implementors' Workshop
      document SEC-SIG-91-20.

   Version 1.5

      Version 1.5 incorporated several editorial changes, including
      updates to the references and the addition of a revision history.

   Version 2.0

      Version 2.0 incorporates major editorial changes in terms of the
      document structure, and introduces the PBES2 encryption scheme,
      the PBMAC1 message authentication scheme, and independent
      password-based key derivation functions. This version continues to
      support the encryption process in version 1.5.







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References

   [1]  American National Standard X9.52 - 1998, Triple Data Encryption
        Algorithm Modes of Operation. Working draft, Accredited
        Standards Committee X9, July 27, 1998.

   [2]  Baldwin, R. and R. Rivest, "The RC5, RC5-CBC, RC5-CBC-Pad, and
        RC5-CTS Algorithms", RFC 2040, October 1996.

   [3]  Balenson, D., "Privacy Enhancement for Internet Electronic Mail:
        Part III: Algorithms, Modes, and Identifiers", RFC 1423,
        February 1993.

   [4]  S.M. Bellovin and M. Merritt. Encrypted key exchange:
        Password-based protocols secure against dictionary attacks. In
        Proceedings of the 1992 IEEE Computer Society Conference on
        Research in Security and Privacy, pages 72-84, IEEE Computer
        Society, 1992.

   [5]  D. Jablon. Strong password-only authenticated key exchange. ACM
        Computer Communications Review, October 1996.

   [6]  Kaliski, B., "The MD2 Message-Digest Algorithm", RFC 1319, April
        1992.

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

   [8]  Robert Morris and Ken Thompson. Password security: A case
        history.  Communications of the ACM, 22(11):594-597, November
        1979.

   [9]  ISO/IEC 8824-1:1995: Information technology - Abstract Syntax
        Notation One (ASN.1) - Specification of basic notation. 1995.

   [10] ISO/IEC 8824-1:1995/Amd.1:1995 Information technology - Abstract
        Syntax Notation One (ASN.1) - Specification of basic notation -
        Amendment 1 - Rules of extensibility. 1995.

   [11] ISO/IEC 8824-2:1995 Information technology - Abstract Syntax
        Notation One (ASN.1) - Information object specification. 1995.

   [12] ISO/IEC 8824-2:1995/Amd.1:1995 Information technology - Abstract
        Syntax Notation One (ASN.1) - Information object specification -
        Amendment 1 - Rules of extensibility. 1995.

   [13] ISO/IEC 8824-3:1995 Information technology - Abstract Syntax
        Notation One (ASN.1) - Constraint specification. 1995.



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