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