00001 #ifndef CRYPTOPP_ITERHASH_H
00002 #define CRYPTOPP_ITERHASH_H
00003
00004 #include "cryptlib.h"
00005 #include "secblock.h"
00006 #include "misc.h"
00007 #include "simple.h"
00008
00009 NAMESPACE_BEGIN(CryptoPP)
00010
00011
00012 class CRYPTOPP_DLL HashInputTooLong : public InvalidDataFormat
00013 {
00014 public:
00015 explicit HashInputTooLong(const std::string &alg)
00016 : InvalidDataFormat("IteratedHashBase: input data exceeds maximum allowed by hash function " + alg) {}
00017 };
00018
00019
00020 template <class T, class BASE>
00021 class CRYPTOPP_NO_VTABLE IteratedHashBase : public BASE
00022 {
00023 public:
00024 typedef T HashWordType;
00025
00026 IteratedHashBase() : m_countLo(0), m_countHi(0) {}
00027 unsigned int OptimalBlockSize() const {return this->BlockSize();}
00028 unsigned int OptimalDataAlignment() const {return GetAlignmentOf<T>();}
00029 void Update(const byte *input, size_t length);
00030 byte * CreateUpdateSpace(size_t &size);
00031 void Restart();
00032 void TruncatedFinal(byte *digest, size_t size);
00033
00034 protected:
00035 inline T GetBitCountHi() const {return (m_countLo >> (8*sizeof(T)-3)) + (m_countHi << 3);}
00036 inline T GetBitCountLo() const {return m_countLo << 3;}
00037
00038 void PadLastBlock(unsigned int lastBlockSize, byte padFirst=0x80);
00039 virtual void Init() =0;
00040
00041 virtual ByteOrder GetByteOrder() const =0;
00042 virtual void HashEndianCorrectedBlock(const HashWordType *data) =0;
00043 virtual size_t HashMultipleBlocks(const T *input, size_t length);
00044 void HashBlock(const HashWordType *input) {HashMultipleBlocks(input, this->BlockSize());}
00045
00046 virtual T* DataBuf() =0;
00047 virtual T* StateBuf() =0;
00048
00049 private:
00050 T m_countLo, m_countHi;
00051 };
00052
00053
00054 template <class T_HashWordType, class T_Endianness, unsigned int T_BlockSize, class T_Base = HashTransformation>
00055 class CRYPTOPP_NO_VTABLE IteratedHash : public IteratedHashBase<T_HashWordType, T_Base>
00056 {
00057 public:
00058 typedef T_Endianness ByteOrderClass;
00059 typedef T_HashWordType HashWordType;
00060
00061 CRYPTOPP_CONSTANT(BLOCKSIZE = T_BlockSize)
00062
00063 CRYPTOPP_COMPILE_ASSERT((T_BlockSize & (T_BlockSize - 1)) == 0);
00064 unsigned int BlockSize() const {return T_BlockSize;}
00065
00066 ByteOrder GetByteOrder() const {return T_Endianness::ToEnum();}
00067
00068 inline static void CorrectEndianess(HashWordType *out, const HashWordType *in, size_t byteCount)
00069 {
00070 ConditionalByteReverse(T_Endianness::ToEnum(), out, in, byteCount);
00071 }
00072
00073 protected:
00074 T_HashWordType* DataBuf() {return this->m_data;}
00075 FixedSizeSecBlock<T_HashWordType, T_BlockSize/sizeof(T_HashWordType)> m_data;
00076 };
00077
00078
00079 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>
00080 class CRYPTOPP_NO_VTABLE IteratedHashWithStaticTransform
00081 : public ClonableImpl<T_Transform, AlgorithmImpl<IteratedHash<T_HashWordType, T_Endianness, T_BlockSize>, T_Transform> >
00082 {
00083 public:
00084 CRYPTOPP_CONSTANT(DIGESTSIZE = T_DigestSize ? T_DigestSize : T_StateSize)
00085 unsigned int DigestSize() const {return DIGESTSIZE;};
00086
00087 protected:
00088 IteratedHashWithStaticTransform() {this->Init();}
00089 void HashEndianCorrectedBlock(const T_HashWordType *data) {T_Transform::Transform(this->m_state, data);}
00090 void Init() {T_Transform::InitState(this->m_state);}
00091
00092 T_HashWordType* StateBuf() {return this->m_state;}
00093 FixedSizeAlignedSecBlock<T_HashWordType, T_BlockSize/sizeof(T_HashWordType), T_StateAligned> m_state;
00094 };
00095
00096 #ifndef __GNUC__
00097 CRYPTOPP_DLL_TEMPLATE_CLASS IteratedHashBase<word64, HashTransformation>;
00098 CRYPTOPP_STATIC_TEMPLATE_CLASS IteratedHashBase<word64, MessageAuthenticationCode>;
00099
00100 CRYPTOPP_DLL_TEMPLATE_CLASS IteratedHashBase<word32, HashTransformation>;
00101 CRYPTOPP_STATIC_TEMPLATE_CLASS IteratedHashBase<word32, MessageAuthenticationCode>;
00102 #endif
00103
00104 NAMESPACE_END
00105
00106 #endif