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// sm3.h - written and placed in the public domain by Jeffrey Walton and Han Lulu
// Based on the specification provided by Sean Shen and Xiaodong Lee.
// Based on code by Krzysztof Kwiatkowski and Jack Lloyd.
// Also see https://tools.ietf.org/html/draft-shen-sm3-hash.
/// \file sm3.h
/// \brief Classes for the SM3 hash function
/// \details SM3 is a hash function designed by Xiaoyun Wang, et al. The hash is part of the
/// Chinese State Cryptography Administration portfolio.
/// \sa <A HREF="https://tools.ietf.org/html/draft-shen-sm3-hash">SM3 Hash Function</A> and
/// <A HREF="http://github.com/guanzhi/GmSSL">Reference implementation using OpenSSL</A>.
/// \since Crypto++ 6.0
#ifndef CRYPTOPP_SM3_H
#define CRYPTOPP_SM3_H
#include "config.h"
#include "iterhash.h"
NAMESPACE_BEGIN(CryptoPP)
/// \brief SM3 hash function
/// \details SM3 is a hash function designed by Xiaoyun Wang, et al. The hash is part of the
/// Chinese State Cryptography Administration portfolio.
/// \sa <A HREF="https://tools.ietf.org/html/draft-shen-sm3-hash">SM3 Hash Function</A>
/// \since Crypto++ 6.0
class SM3 : public IteratedHashWithStaticTransform<word32, BigEndian, 64, 32, SM3, 32, true>
{
public:
/// \brief Initialize state array
/// \param state the state of the hash
/// \details InitState sets a state array to SHA256 initial values
/// \details Hashes which derive from IteratedHashWithStaticTransform provide static
/// member functions InitState() and Transform(). External classes, like SEAL and MDC,
/// can initialize state with a user provided key and operate the hash on the data
/// with the user supplied state.
static void InitState(HashWordType *state);
/// \brief Operate the hash
/// \param digest the state of the hash
/// \param data the data to be digested
/// \details Transform() operates the hash on <tt>data</tt>. When the call is invoked
/// <tt>digest</tt> holds initial or current state. Upon return <tt>digest</tt> holds
/// the hash or updated state.
/// \details Hashes which derive from IteratedHashWithStaticTransform provide static
/// member functions InitState() and Transform(). External classes, like SEAL and MDC,
/// can initialize state with a user provided key and operate the hash on the data
/// with the user supplied state.
static void Transform(HashWordType *digest, const HashWordType *data);
/// \brief The algorithm name
/// \return C-style string "SM3"
CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() { return "SM3"; }
protected:
size_t HashMultipleBlocks(const HashWordType *input, size_t length);
};
NAMESPACE_END
#endif // CRYPTOPP_SM3_H
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