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#ifndef CRYPTOPP_ITERHASH_H
#define CRYPTOPP_ITERHASH_H
#include "cryptlib.h"
#include "secblock.h"
#include "misc.h"
#include "simple.h"
NAMESPACE_BEGIN(CryptoPP)
//! exception thrown when trying to hash more data than is allowed by a hash function
class CRYPTOPP_DLL HashInputTooLong : public InvalidDataFormat
{
public:
explicit HashInputTooLong(const std::string &alg)
: InvalidDataFormat("IteratedHashBase: input data exceeds maximum allowed by hash function " + alg) {}
};
//! _
template <class T, class BASE>
class CRYPTOPP_NO_VTABLE IteratedHashBase : public BASE
{
public:
typedef T HashWordType;
IteratedHashBase() : m_countLo(0), m_countHi(0) {}
unsigned int OptimalBlockSize() const {return this->BlockSize();}
unsigned int OptimalDataAlignment() const {return GetAlignmentOf<T>();}
void Update(const byte *input, size_t length);
byte * CreateUpdateSpace(size_t &size);
void Restart();
void TruncatedFinal(byte *digest, size_t size);
protected:
inline T GetBitCountHi() const {return (m_countLo >> (8*sizeof(T)-3)) + (m_countHi << 3);}
inline T GetBitCountLo() const {return m_countLo << 3;}
void PadLastBlock(unsigned int lastBlockSize, byte padFirst=0x80);
virtual void Init() =0;
virtual ByteOrder GetByteOrder() const =0;
virtual void HashEndianCorrectedBlock(const HashWordType *data) =0;
virtual size_t HashMultipleBlocks(const T *input, size_t length);
void HashBlock(const HashWordType *input) {HashMultipleBlocks(input, this->BlockSize());}
virtual T* DataBuf() =0;
virtual T* StateBuf() =0;
private:
T m_countLo, m_countHi;
};
//! _
template <class T_HashWordType, class T_Endianness, unsigned int T_BlockSize, class T_Base = HashTransformation>
class CRYPTOPP_NO_VTABLE IteratedHash : public IteratedHashBase<T_HashWordType, T_Base>
{
public:
typedef T_Endianness ByteOrderClass;
typedef T_HashWordType HashWordType;
CRYPTOPP_CONSTANT(BLOCKSIZE = T_BlockSize)
// BCB2006 workaround: can't use BLOCKSIZE here
CRYPTOPP_COMPILE_ASSERT((T_BlockSize & (T_BlockSize - 1)) == 0); // blockSize is a power of 2
unsigned int BlockSize() const {return T_BlockSize;}
ByteOrder GetByteOrder() const {return T_Endianness::ToEnum();}
inline static void CorrectEndianess(HashWordType *out, const HashWordType *in, size_t byteCount)
{
ConditionalByteReverse(T_Endianness::ToEnum(), out, in, byteCount);
}
protected:
T_HashWordType* DataBuf() {return this->m_data;}
FixedSizeSecBlock<T_HashWordType, T_BlockSize/sizeof(T_HashWordType)> m_data;
};
//! _
template <class T_HashWordType, class T_Endianness, unsigned int T_BlockSize, unsigned int T_StateSize, class T_Transform, unsigned int T_DigestSize = 0, bool T_StateAligned = false>
class CRYPTOPP_NO_VTABLE IteratedHashWithStaticTransform
: public ClonableImpl<T_Transform, AlgorithmImpl<IteratedHash<T_HashWordType, T_Endianness, T_BlockSize>, T_Transform> >
{
public:
CRYPTOPP_CONSTANT(DIGESTSIZE = T_DigestSize ? T_DigestSize : T_StateSize)
unsigned int DigestSize() const {return DIGESTSIZE;};
protected:
IteratedHashWithStaticTransform() {this->Init();}
void HashEndianCorrectedBlock(const T_HashWordType *data) {T_Transform::Transform(this->m_state, data);}
void Init() {T_Transform::InitState(this->m_state);}
T_HashWordType* StateBuf() {return this->m_state;}
FixedSizeAlignedSecBlock<T_HashWordType, T_BlockSize/sizeof(T_HashWordType), T_StateAligned> m_state;
};
#ifndef __GNUC__
CRYPTOPP_DLL_TEMPLATE_CLASS IteratedHashBase<word64, HashTransformation>;
CRYPTOPP_STATIC_TEMPLATE_CLASS IteratedHashBase<word64, MessageAuthenticationCode>;
CRYPTOPP_DLL_TEMPLATE_CLASS IteratedHashBase<word32, HashTransformation>;
CRYPTOPP_STATIC_TEMPLATE_CLASS IteratedHashBase<word32, MessageAuthenticationCode>;
#endif
NAMESPACE_END
#endif
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