draft-ietf-lamps-cms-shakes-04.txt

LAMPS WG                                                         Q. Dang
Internet-Draft                                                      NIST
Intended status: Standards Track                           P. Kampanakis
Expires: June 2, 2019                                      Cisco Systems
                                                       November 29, 2018


  Use of the SHAKE One-way Hash Functions in the Cryptographic Message
                              Syntax (CMS)
                     draft-ietf-lamps-cms-shakes-04

Abstract

   This document describes the conventions for using the SHAKE family of
   hash functions with the Cryptographic Message Syntax (CMS) as one-way
   hash functions with the RSA Probabilistic signature and ECDSA
   signature algorithms, as message digests and message authentication
   codes.  The conventions for the associated signer public keys in CMS
   are also described.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on June 2, 2019.

Copyright Notice

   Copyright (c) 2018 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
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   to this document.  Code Components extracted from this document must



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   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.  Change Log  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Identifiers . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Use in CMS  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Message Digests . . . . . . . . . . . . . . . . . . . . .   6
     4.2.  Signatures  . . . . . . . . . . . . . . . . . . . . . . .   6
       4.2.1.  RSASSA-PSS Signatures . . . . . . . . . . . . . . . .   6
       4.2.2.  Deterministic ECDSA Signatures  . . . . . . . . . . .   7
     4.3.  Public Keys . . . . . . . . . . . . . . . . . . . . . . .   7
     4.4.  Message Authentication Codes  . . . . . . . . . . . . . .   8
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Appendix A.  ASN.1 Module . . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Change Log

   [ EDNOTE: Remove this section before publication. ]

   o  draft-ietf-lamps-cms-shake-04:

      *  Added RFC8174 reference and text.

      *  Explicitly explained why RSASSA-PSS-params are omitted in
         section 4.2.1.

      *  Simplified Public Keys section by removing redundand info from
         RFCs.

   o  draft-ietf-lamps-cms-shake-03:

      *  Removed paragraph suggesting KMAC to be used in generating k in
         Deterministric ECDSA.  That should be RFC6979-bis.

      *  Removed paragraph from Security Considerations that talks about
         randomness of k because we are using deterministric ECDSA.




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      *  Completed ASN.1 module and fixed KMAC ASN.1 based on Jim's
         feedback.

      *  Text fixes.

   o  draft-ietf-lamps-cms-shake-02:

      *  Updates based on suggestions and clarifications by Jim.

      *  Started ASN.1 module.

   o  draft-ietf-lamps-cms-shake-01:

      *  Significant reorganization of the sections to simplify the
         introduction, the new OIDs and their use in CMS.

      *  Added new OIDs for RSASSA-PSS that hardcodes hash, salt and
         MGF, according the WG consensus.

      *  Updated Public Key section to use the new RSASSA-PSS OIDs and
         clarify the algorithm identifier usage.

      *  Removed the no longer used SHAKE OIDs from section 3.1.

   o  draft-ietf-lamps-cms-shake-00:

      *  Various updates to title and section names.

      *  Content changes filling in text and references.

   o  draft-dang-lamps-cms-shakes-hash-00:

      *  Initial version

2.  Introduction

   The Cryptographic Message Syntax (CMS) [RFC5652] is used to digitally
   sign, digest, authenticate, or encrypt arbitrary message contents.
   This specification describes the use of the SHAKE128 and SHAKE256
   specified in [SHA3] as new hash functions in CMS.  In addition, it
   describes the use of these functions with the RSASSA-PSS signature
   algorithm [RFC8017] and the Elliptic Curve Digital Signature
   Algorithm (ECDSA) [X9.62] with the CMS signed-data content type.

   In the SHA-3 family, two extendable-output functions (SHAKEs),
   SHAKE128 and SHAKE256, are defined.  Four other hash function
   instances, SHA3-224, SHA3-256, SHA3-384, and SHA3-512 are also
   defined but are out of scope for this document.  A SHAKE is a



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   variable length hash function.  The output length, in bits, of a
   SHAKE is defined by the d parameter.  The corresponding collision and
   second preimage resistance strengths for SHAKE128 are min(d/2,128)
   and min(d,128) bits respectively.  And, the corresponding collision
   and second preimage resistance strengths for SHAKE256 are
   min(d/2,256) and min(d,256) bits respectively.

   A SHAKE can be used in CMS as the message digest function (to hash
   the message to be signed) in RSASSA-PSS and deterministic ECDSA,
   message authentication code and as the mask generating function in
   RSASSA-PSS.  This specification describes the identifiers for SHAKEs
   to be used in CMS and their meaning.

2.1.  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 BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  Identifiers

   This section defines six new OIDs for using SHAKE128 and SHAKE256 in
   CMS.

   EDNOTE: If PKIX draft is standardized first maybe we should not say
   the identifiers are new for the RSASSA-PSS and ECDSA.

   Two object identifiers for SHAKE128 and SHAKE256 hash functions are
   defined in [shake-nist-oids] and we include them here for
   convenience.

     id-shake128-len OBJECT IDENTIFIER ::= { joint-iso-itu-t(2)
          country(16) us(840) organization(1) gov(101) csor(3)
          nistAlgorithm(4) 2 17 }

     id-shake256-len OBJECT IDENTIFIER ::= { joint-iso-itu-t(2)
          country(16) us(840) organization(1) gov(101) csor(3)
          nistAlgorithm(4) 2 18 }

   In this specification, when using the id-shake128-len or id-
   shake256-len algorithm identifiers, the parameters MUST be absent.
   That is, the identifier SHALL be a SEQUENCE of one component, the
   OID.

   We define two new identifiers for RSASSA-PSS signatures using SHAKEs.




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     id-RSASSA-PSS-SHAKE128  OBJECT IDENTIFIER  ::=  { TBD }

     id-RSASSA-PSS-SHAKE256  OBJECT IDENTIFIER  ::=  { TBD }

     [ EDNOTE: "TBD" will be specified by NIST later. ]

   The same RSASSA-PSS algorithm identifiers can be used for identifying
   public keys and signatures.

   We define two new algorithm identifiers of ECDSA signatures using
   SHAKEs.

     id-ecdsa-with-SHAKE128 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2)
         country(16) us(840) organization(1) gov(101) csor(3)
         nistAlgorithm(4) 3  TBD }

     id-ecdsa-with-SHAKE256 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2)
         country(16) us(840) organization(1) gov(101) csor(3)
         nistAlgorithm(4) 3  TBD }

     [ EDNOTE: "TBD" will be specified by NIST. ]

   The parameters for the four RSASSA-PSS and deterministic ECDSA
   identifiers MUST be absent.  That is, each identifier SHALL be a
   SEQUENCE of one component, the OID.

   Two new object identifiers for KMACs using SHAKE128 and SHAKE256 are
   define elow.

      id-KmacWithSHAKE128 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2)
          country(16) us(840) organization(1) gov(101) csor(3)
          nistAlgorithm(4) 2 19 }

      id-KmacWithSHAKE256 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2)
          country(16) us(840) organization(1) gov(101) csor(3)
          nistAlgorithm(4) 2 20 }

   The parameters for id-KmacWithSHAKE128 and id-KmacWithSHAKE256 MUST
   be absent.  That is, each identifier SHALL be a SEQUENCE of one
   component, the OID.

   Section 4.1, Section 4.2.1, Section 4.2.2 and Section 4.4 specify the
   required output length for each use of SHAKE128 or SHAKE256 in
   message digests, RSASSA-PSS, determinstic ECDSA and KMAC.







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4.  Use in CMS

4.1.  Message Digests

   The id-shake128-len and id-shake256-len OIDs (Section 3) can be used
   as the digest algorithm identifiers located in the SignedData,
   SignerInfo, DigestedData, and the AuthenticatedData digestAlgorithm
   fields in CMS [RFC5652].  The encoding MUST omit the parameters field
   and the output size, d, for the SHAKE128 or SHAKE256 message digest
   MUST be 256 or 512 bits respectively.

   The digest values are located in the DigestedData field and the
   Message Digest authenticated attribute included in the
   signedAttributes of the SignedData signerInfo.  In addition, digest
   values are input to signature algorithms.  The digest algorithm MUST
   be the same as the message hash algorithms used in signatures.

4.2.  Signatures

   In CMS, signature algorithm identifiers are located in the SignerInfo
   signatureAlgorithm field of SignedData content type and
   countersignature attribute.  Signature values are located in the
   SignerInfo signature field of SignedData and countersignature.

   Conforming implementations that process RSASSA-PSS and deterministic
   ECDSA with SHAKE signatures when processing CMS data MUST recognize
   the corresponding OIDs specified in Section 3.

4.2.1.  RSASSA-PSS Signatures

   The RSASSA-PSS algorithm is defined in [RFC8017].  When id-RSASSA-
   PSS-SHAKE128 or id-RSASSA-PSS-SHAKE256 specified in Section 3 is
   used, the encoding MUST omit the parameters field.  That is, the
   AlgorithmIdentifier SHALL be a SEQUENCE of one component, id-RSASSA-
   PSS-SHAKE128 or id-RSASSA-PSS-SHAKE256.  [RFC4055] defines RSASSA-
   PSS-params that are used to define the algorithms and inputs to the
   algorithm.  This specification does not use parameters because the
   hash and mask generating algorithsm and trailer and salt are embedded
   in the OID definition.

   The hash algorithm to hash a message being signed and the hash and
   the hash algorithm as the mask generation function used in RSASSA-PSS
   MUST be the same, SHAKE128 or SHAKE256 respectively.  The output-
   length of the hash algorithm which hashes the message SHALL be 32 or
   64 bytes respectively.

   The mask generation function takes an octet string of variable length
   and a desired output length as input, and outputs an octet string of



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   the desired length.  In RSASSA-PSS with SHAKES, the SHAKEs MUST be
   used natively as the MGF function, instead of the MGF1 algorithm that
   uses the hash function in multiple iterations as specified in
   Section B.2.1 of [RFC8017].  In other words, the MGF is defined as
   the SHAKE128 or SHAKE256 output of the mgfSeed for id-RSASSA-PSS-
   SHAKE128 and id-RSASSA-PSS-SHAKE256 respectively.  The mgfSeed is the
   seed from which mask is generated, an octet string [RFC8017].  The
   output length is (n - 264)/8 or (n - 520)/8 bytes respectively, where
   n is the RSA modulus in bits.  For example, when RSA modulus n is
   2048, the output length of SHAKE128 or SHAKE256 as the MGF will be
   223 or 191-bits when id-RSASSA-PSS-SHAKE128 or id-RSASSA-PSS-SHAKE256
   is used respectively.

   The RSASSA-PSS saltLength MUST be 32 or 64 bytes respectively.
   Finally, the trailerField MUST be 1, which represents the trailer
   field with hexadecimal value 0xBC [RFC8017].

4.2.2.  Deterministic ECDSA Signatures

   The Elliptic Curve Digital Signature Algorithm (ECDSA) is defined in
   [X9.62].  When the id-ecdsa-with-SHAKE128 or id-ecdsa-with-SHAKE256
   (specified in Section 3) algorithm identifier appears, the respective
   SHAKE function is used as the hash.  The encoding MUST omit the
   parameters field.  That is, the AlgorithmIdentifier SHALL be a
   SEQUENCE of one component, the OID id-ecdsa-with-SHAKE128 or id-
   ecdsa-with-SHAKE256.

   For simplicity and compliance with the ECDSA standard specification,
   the output size of the hash function must be explicitly determined.
   The output size, d, for SHAKE128 or SHAKE256 used in ECDSA MUST be
   256 or 512 bits respectively.

   Conforming implementations that generate ECDSA with SHAKE signatures
   in CMS MUST generate such signatures with a deterministicly
   generated, non-random k in accordance with all the requirements
   specified in [RFC6979].  They MAY also generate such signatures in
   accordance with all other recommendations in [X9.62] or [SEC1] if
   they have a stated policy that requires conformance to these
   standards.

4.3.  Public Keys

   In CMS, the signer's public key algorithm identifiers are located in
   the OriginatorPublicKey's algorithm attribute.

   Conforming implementations MUST specify the algorithms explicitly by
   using the OIDs specified in Section 3 when encoding RSASSA-PSS with
   SHAKE public keys in CMS messages.  The conventions and encoding for



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   RSASSA-PSS and ECDSA public keys algorithm identifiers are as
   specified in Section 2.3 of [RFC3279], Section 3.1 of [RFC4055] and
   Section 2.1 of [RFC5480].

   When the RSA private key owner wishes to limit the use of the public
   key exclusively to RSASSA-PSS, the AlgorithmIdentifier for RSASSA-PSS
   defined in Section 3 can be used as the algorithm attribute in the
   OriginatorPublicKey sequence.  The identifier parameters, as
   explained in Section 3, MUST be absent.  The RSASSA-PSS algorithm
   functions and output lengths are the same as defined in
   Section 4.2.1.

4.4.  Message Authentication Codes

   KMAC message authentication code (KMAC) is specified in [SP800-185].
   In CMS, KMAC algorithm identifiers are located in the
   AuthenticatedData macAlgorithm field.  The KMAC values are located in
   the AuthenticatedData mac field.

   When the id-KmacWithSHAKE128 or id-KmacWithSHAKE256 algorithm
   identifier is used as the MAC algorithm identifier, the parameters
   field is optional (absent or present).  If absent, the SHAKE256
   output length used in KMAC is 256 or 512 bits respectively and the
   customization string is an empty string by default.

   Conforming implementations that process KMACs with the SHAKEs when
   processing CMS data MUST recognize these identifiers.

   When calculating the KMAC output, the variable N is 0xD2B282C2, S is
   an empty string, and L, the integer representing the requested output
   length in bits, is 256 or 512 for KmacWithSHAKE128 or
   KmacWithSHAKE256 respectively in this specification.

5.  IANA Considerations

   [ EDNOTE: Update here only if there are OID allocations by IANA. ]

   This document has no IANA actions.

6.  Security Considerations

   The SHAKEs are deterministic functions.  Like any other deterministic
   function, executing each function with the same input multiple times
   will produce the same output.  Therefore, users should not expect
   unrelated outputs (with the same or different output lengths) from
   excuting a SHAKE function with the same input multiple times.  The
   shorter one of any 2 outputs produced from a SHAKE with the same
   input is a prefix of the longer one.  It is a similar situation as



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   truncating a 512-bit output of SHA-512 by taking its 256 left-most
   bits.  These 256 left-most bits are a prefix of the 512-bit output.

   Implementations must protect the signer's private key.  Compromise of
   the signer's private key permits masquerade.

   When more than two parties share the same message-authentication key,
   data origin authentication is not provided.  Any party that knows the
   message-authentication key can compute a valid MAC, therefore the
   content could originate from any one of the parties.

   Implementers should be aware that cryptographic algorithms may become
   weaker with time.  As new cryptanalysis techniques are developed and
   computing power increases, the work factor or time required to break
   a particular cryptographic algorithm may decrease.  Therefore,
   cryptographic algorithm implementations should be modular allowing
   new algorithms to be readily inserted.  That is, implementers should
   be prepared to regularly update the set of algorithms in their
   implementations.

7.  Acknowledgements

   This document is based on Russ Housley's draft
   [I-D.housley-lamps-cms-sha3-hash] It replaces SHA3 hash functions by
   SHAKE128 and SHAKE256 as the LAMPS WG agreed.

8.  References

8.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [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,
              DOI 10.17487/RFC4055, June 2005,
              <https://www.rfc-editor.org/info/rfc4055>.

   [RFC5480]  Turner, S., Brown, D., Yiu, K., Housley, R., and T. Polk,
              "Elliptic Curve Cryptography Subject Public Key
              Information", RFC 5480, DOI 10.17487/RFC5480, March 2009,
              <https://www.rfc-editor.org/info/rfc5480>.





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   [RFC5652]  Housley, R., "Cryptographic Message Syntax (CMS)", STD 70,
              RFC 5652, DOI 10.17487/RFC5652, September 2009,
              <https://www.rfc-editor.org/info/rfc5652>.

   [RFC8017]  Moriarty, K., Ed., Kaliski, B., Jonsson, J., and A. Rusch,
              "PKCS #1: RSA Cryptography Specifications Version 2.2",
              RFC 8017, DOI 10.17487/RFC8017, November 2016,
              <https://www.rfc-editor.org/info/rfc8017>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [SHA3]     National Institute of Standards and Technology, U.S.
              Department of Commerce, "SHA-3 Standard - Permutation-
              Based Hash and Extendable-Output Functions", FIPS PUB 202,
              August 2015.

   [SP800-185]
              National Institute of Standards and Technology, "SHA-3
              Derived Functions: cSHAKE, KMAC, TupleHash and
              ParallelHash. NIST SP 800-185", December 2016,
              <http://nvlpubs.nist.gov/nistpubs/SpecialPublications/
              NIST.SP.800-185.pdf>.

8.2.  Informative References

   [I-D.housley-lamps-cms-sha3-hash]
              Housley, R., "Use of the SHA3 One-way Hash Functions in
              the Cryptographic Message Syntax (CMS)", draft-housley-
              lamps-cms-sha3-hash-00 (work in progress), March 2017.

   [RFC3279]  Bassham, L., Polk, W., and R. Housley, "Algorithms and
              Identifiers for the Internet X.509 Public Key
              Infrastructure Certificate and Certificate Revocation List
              (CRL) Profile", RFC 3279, DOI 10.17487/RFC3279, April
              2002, <https://www.rfc-editor.org/info/rfc3279>.

   [RFC6979]  Pornin, T., "Deterministic Usage of the Digital Signature
              Algorithm (DSA) and Elliptic Curve Digital Signature
              Algorithm (ECDSA)", RFC 6979, DOI 10.17487/RFC6979, August
              2013, <https://www.rfc-editor.org/info/rfc6979>.

   [SEC1]     Standards for Efficient Cryptography Group, "SEC 1:
              Elliptic Curve Cryptography", May 2009,
              <http://www.secg.org/sec1-v2.pdf>.





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   [shake-nist-oids]
              National Institute of Standards and Technology, "Computer
              Security Objects Register", October 2017,
              <https://csrc.nist.gov/Projects/Computer-Security-Objects-
              Register/Algorithm-Registration>.

   [X9.62]    American National Standard for Financial Services (ANSI),
              "X9.62-2005 Public Key Cryptography for the Financial
              Services Industry: The Elliptic Curve Digital Signature
              Standard (ECDSA)", November 2005.

Appendix A.  ASN.1 Module

   This appendix includes the ASN.1 modules for SHAKEs in CMS.  This
   module includes some ASN.1 from other standards for reference.

   CMSAlgsForSHAKE-2018 { { iso(1) member-body(2) us(840)
        rsadsi(113549) pkcs(1) pkcs-9(9) smime(16) modules(0)
        id-mod-cms-shakes(TBD) }

   DEFINITIONS EXPLICIT TAGS ::=

   BEGIN

   -- EXPORTS ALL;

   IMPORTS

   DIGEST-ALGORITHM, MAC-ALGORITHM, SMIME-CAPS
   FROM AlgorithmInformation-2009
     { iso(1) identified-organization(3) dod(6) internet(1) security(5)
       mechanisms(5) pkix(7) id-mod(0)
       id-mod-algorithmInformation-02(58) }

   RSAPublicKey, rsaEncryption, id-ecPublicKey
   FROM PKIXAlgs-2009 { iso(1) identified-organization(3) dod(6)
        internet(1) security(5) mechanisms(5) pkix(7) id-mod(0)
        id-mod-pkix1-algorithms2008-02(56) }

   --
   -- Message Digest Algorithms (mda-)
   -- used in SignedData, SignerInfo, DigestedData,
   -- and the AuthenticatedData digestAlgorithm
   -- fields in CMS
   --
   digestAlgorithms DIGEST-ALGORITHM ::= {
    ...
    -- This expands MessageAuthAlgs from [RFC5652]



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    -- and MessageDigestAlgs in [RFC5753]
    mda-shake128   |
    mda-shake256,
    ...
   }

   --
   -- One-Way Hash Functions
   -- SHAKE128
   mda-shake128 DIGEST-ALGORITHM ::= {
     IDENTIFIER id-shake128  -- with output length 32 bytes.
   }
   id-shake128 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16)
                                       us(840) organization(1) gov(101)
                                       csor(3) nistAlgorithm(4)
                                       hashAlgs(2) 11 }

   -- SHAKE-256
   mda-shake256 DIGEST-ALGORITHM ::= {
     IDENTIFIER id-shake256  -- with output length 64 bytes.
   }
   id-shake256 OBJECT IDENTIFIER ::= { joint-iso-itu-t(2) country(16)
                                       us(840) organization(1) gov(101)
                                       csor(3) nistAlgorithm(4)
                                       hashAlgs(2) 12 }

   --
   -- Public key algorithm identifiers located in the
   -- OriginatorPublicKey's algorithm attribute in CMS.
   -- And Signature identifiers used in SignerInfo
   -- signatureAlgorithm field of SignedData content
   -- type and countersignature attribute in CMS.
   --
   -- From RFC5280, for reference.
   -- rsaEncryption OBJECT IDENTIFIER ::=  { pkcs-1 1 }
      -- When the rsaEncryption algorithm identifier is used
      -- for a public key, the AlgorithmIdentifier parameters
      -- field MUST contain NULL.
   --
   id-RSASSA-PSS-SHAKE128  OBJECT IDENTIFIER  ::=  { TBD }
   id-RSASSA-PSS-SHAKE256  OBJECT IDENTIFIER  ::=  { TBD }
      -- When the id-RSASSA-PSS-* algorithm identifiers are used
      -- for a public key or a signature in CMS, the AlgorithmIdentifier
      -- parameters field MUST be absent. The message digest algorithm
      -- used in RSASSA-PSS MUST be SHAKE128 or SHAKE256 with a 32 or
      -- 64 byte outout length respectively. The mask generating
      -- function MUST be SHAKE128 or SHAKE256 with an output length
      -- of (n - 264)/8 or (n - 520)/8 bytes respectively, where n



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      -- is the RSA modulus in bits.  The RSASSA-PSS saltLength MUST
      -- be 32 or 64 bytes respectively. In both cases, the RSA
      -- public key, MUST be encoded using the RSAPublicKey type.
   -- From RFC4055, for reference.
   -- RSAPublicKey ::= SEQUENCE {
   --   modulus INTEGER, -- n
   --   publicExponent INTEGER } -- e

   id-ecdsa-with-shake128 ::= { joint-iso-itu-t(2) country(16)
                                us(840) organization(1) gov(101)
                                csor(3) nistAlgorithm(4)
                                sigAlgs(3) TBD }
   id-ecdsa-with-shake256 ::= { joint-iso-itu-t(2) country(16)
                                us(840) organization(1) gov(101)
                                csor(3) nistAlgorithm(4)
                                sigAlgs(3) TBD }
      -- When the id-ecdsa-with-shake* algorithm identifiers are
      -- used in CMS, the AlgorithmIdentifier parameters field
      -- MUST be absent and the signature algorithm should
      -- Deterministric ECDSA [RFC6979]. The message digest MUST
      -- be SHAKE128 or SHAKE256 with a 32 or 64 byte outout
      -- length respectively. In both cases, the ECDSA public key,
      -- MUST be encoded using the id-ecPublicKey type.
   -- From RFC5480, for reference.
   -- id-ecPublicKey OBJECT IDENTIFIER ::= {
   --     iso(1) member-body(2) us(840) ansi-X9-62(10045) keyType(2) 1 }
        -- The id-ecPublicKey parameters must be absent or present
        -- and are defined as
   -- ECParameters ::= CHOICE {
   --     namedCurve         OBJECT IDENTIFIER
   --     -- implicitCurve   NULL
   --     -- specifiedCurve  SpecifiedECDomain
   --  }

   --
   -- Message Authentication (maca-) Algorithms
   -- used in AuthenticatedData macAlgorithm in CMS
   --
   MessageAuthAlgs MAC-ALGORITHM ::= {
     ...
         -- This expands MessageAuthAlgs from [RFC5652] and [RFC6268]
         maca-KMACwithSHAKE128   |
         maca-KMACwithSHAKE256
   }

   SMimeCaps SMIME-CAPS ::= {
      ...
          -- The expands SMimeCaps from [RFC5911]



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      maca-KMACwithSHAKE128   |
      maca-KMACwithSHAKE256
    }

   --
   -- KMAC with SHAKE128
   maca-KMACwithSHAKE128 MAC-ALGORITHM ::= {
         IDENTIFIER id-KMACWithSHAKE128
         PARAMS TYPE KMACwithSHAKE128-params ARE optional
           -- If KMACwithSHAKE128-params parameters are absent
           -- the SHAKE128 output length used in KMAC is 256 bits
           -- and the customization string is an empty string.
         SMIME-CAPS {IDENTIFIED BY id-KMACWithSHAKE128}
   }
   id-KMACWithSHAKE128 OBJECT IDENTIFIER ::=  { joint-iso-itu-t(2)
                                country(16) us(840) organization(1)
                                gov(101) csor(3) nistAlgorithm(4)
                                hashAlgs(2) 19 }
   KMACwithSHAKE128-params ::= SEQUENCE {
      KMACOutputLength     INTEGER DEFAULT 256, -- Output length in bits
      customizationString  OCTET STRING DEFAULT ''H
   }

   -- KMAC with SHAKE256
   maca-KMACwithSHAKE256 MAC-ALGORITHM ::= {
         IDENTIFIER id-KMACWithSHAKE256
         PARAMS TYPE KMACwithSHAKE256-params ARE optional
            -- If KMACwithSHAKE256-params parameters are absent
            -- the SHAKE256 output length used in KMAC is 512 bits
            -- and the customization string is an empty string.
         SMIME-CAPS {IDENTIFIED BY id-KMACWithSHAKE256}
   }
   id-KMACWithSHAKE256 OBJECT IDENTIFIER ::=  { joint-iso-itu-t(2)
                               country(16) us(840) organization(1)
                               gov(101) csor(3) nistAlgorithm(4)
                               hashAlgs(2) 20 }
   KMACwithSHAKE256-params ::= SEQUENCE {
      KMACOutputLength     INTEGER DEFAULT 512, -- Output length in bits
      customizationString  OCTET STRING DEFAULT ''H
   }

   END

Authors' Addresses







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   Quynh Dang
   NIST
   100 Bureau Drive
   Gaithersburg, MD 20899

   Email: quynh.Dang@nist.gov


   Panos Kampanakis
   Cisco Systems

   Email: pkampana@cisco.com







































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