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Viewing changes to cryptopp/emsa2.h

  • Committer: Bazaar Package Importer
  • Author(s): Zooko O'Whielacronx
  • Date: 2009-06-22 22:20:50 UTC
  • Revision ID: james.westby@ubuntu.com-20090622222050-hbqmn50dt2kvoz5o
Tags: upstream-0.5.14
Import upstream version 0.5.14

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cryptopp/emsa2.h
 
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#ifndef CRYPTOPP_EMSA2_H
 
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#define CRYPTOPP_EMSA2_H
 
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/** \file
 
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        This file contains various padding schemes for public key algorithms.
 
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*/
 
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#include "cryptlib.h"
 
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#include "pubkey.h"
 
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#ifdef CRYPTOPP_IS_DLL
 
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#include "sha.h"
 
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#endif
 
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NAMESPACE_BEGIN(CryptoPP)
 
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template <class H> class EMSA2HashId
 
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{
 
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public:
 
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        static const byte id;
 
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};
 
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template <class BASE>
 
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class EMSA2HashIdLookup : public BASE
 
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{
 
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public:
 
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        struct HashIdentifierLookup
 
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        {
 
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                template <class H> struct HashIdentifierLookup2
 
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                {
 
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                        static HashIdentifier Lookup()
 
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                        {
 
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                                return HashIdentifier(&EMSA2HashId<H>::id, 1);
 
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                        }
 
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                };
 
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        };
 
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};
 
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// EMSA2HashId can be instantiated with the following classes.
 
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class SHA1;
 
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class RIPEMD160;
 
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class RIPEMD128;
 
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class SHA256;
 
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class SHA384;
 
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class SHA512;
 
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class Whirlpool;
 
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class SHA224;
 
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// end of list
 
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#ifdef CRYPTOPP_IS_DLL
 
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CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA1>;
 
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CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA224>;
 
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CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA256>;
 
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CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA384>;
 
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CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA512>;
 
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#endif
 
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//! _
 
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class CRYPTOPP_DLL EMSA2Pad : public EMSA2HashIdLookup<PK_DeterministicSignatureMessageEncodingMethod>
 
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{
 
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public:
 
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        static const char * CRYPTOPP_API StaticAlgorithmName() {return "EMSA2";}
 
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        size_t MinRepresentativeBitLength(size_t hashIdentifierLength, size_t digestLength) const
 
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                {return 8*digestLength + 31;}
 
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        void ComputeMessageRepresentative(RandomNumberGenerator &rng, 
 
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                const byte *recoverableMessage, size_t recoverableMessageLength,
 
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                HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
 
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                byte *representative, size_t representativeBitLength) const;
 
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};
 
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//! EMSA2, for use with RWSS and RSA_ISO
 
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/*! Only the following hash functions are supported by this signature standard:
 
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        \dontinclude emsa2.h
 
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        \skip EMSA2HashId can be instantiated
 
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        \until end of list
 
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*/
 
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struct P1363_EMSA2 : public SignatureStandard
 
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{
 
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        typedef EMSA2Pad SignatureMessageEncodingMethod;
 
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};
 
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NAMESPACE_END
 
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#endif