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 template <class T, class BASE>
00013 class CRYPTOPP_NO_VTABLE
IteratedHashBase : public BASE
00014 {
00015
public:
00016
typedef T HashWordType;
00017
00018
IteratedHashBase() : m_countHi(0), m_countLo(0) {}
00019
unsigned int BlockSize()
const {
return m_data.size() *
sizeof(T);}
00020
unsigned int OptimalBlockSize()
const {
return BlockSize();}
00021
unsigned int OptimalDataAlignment()
const {
return sizeof(T);}
00022
void Update(
const byte *input,
unsigned int length);
00023 byte * CreateUpdateSpace(
unsigned int &size);
00024
void Restart();
00025
00026
protected:
00027
void SetBlockSize(
unsigned int blockSize) {m_data.resize(blockSize /
sizeof(HashWordType));}
00028
void SetStateSize(
unsigned int stateSize) {m_digest.resize(stateSize /
sizeof(HashWordType));}
00029
00030 T GetBitCountHi()
const {
return (m_countLo >> (8*
sizeof(T)-3)) + (m_countHi << 3);}
00031 T GetBitCountLo()
const {
return m_countLo << 3;}
00032
00033
virtual unsigned int HashMultipleBlocks(
const T *input,
unsigned int length);
00034
void PadLastBlock(
unsigned int lastBlockSize, byte padFirst=0x80);
00035
virtual void Init() =0;
00036
virtual void HashBlock(
const T *input) =0;
00037
00038
SecBlock<T> m_data;
00039
SecBlock<T> m_digest;
00040
00041
private:
00042 T m_countLo, m_countHi;
00043 };
00044
00045
#ifdef WORD64_AVAILABLE
00046
CRYPTOPP_STATIC_TEMPLATE_CLASS
IteratedHashBase<word64, HashTransformation>;
00047 CRYPTOPP_STATIC_TEMPLATE_CLASS
IteratedHashBase<word64, MessageAuthenticationCode>;
00048
#endif
00049
00050 CRYPTOPP_DLL_TEMPLATE_CLASS
IteratedHashBase<word32, HashTransformation>;
00051 CRYPTOPP_STATIC_TEMPLATE_CLASS
IteratedHashBase<word32, MessageAuthenticationCode>;
00052
00053
00054
template <
class T,
class B,
class BASE>
00055 class CRYPTOPP_NO_VTABLE IteratedHashBase2 :
public IteratedHashBase<T, BASE>
00056 {
00057
public:
00058
typedef B ByteOrderClass;
00059
typedef typename IteratedHashBase<T, BASE>::HashWordType HashWordType;
00060
00061
inline static void CorrectEndianess(HashWordType *out,
const HashWordType *in,
unsigned int byteCount)
00062 {
00063 ConditionalByteReverse(B::ToEnum(), out, in, byteCount);
00064 }
00065
00066
void TruncatedFinal(byte *digest,
unsigned int size);
00067
00068
protected:
00069
void HashBlock(
const HashWordType *input);
00070
virtual void HashEndianCorrectedBlock(
const HashWordType *data) =0;
00071 };
00072
00073
00074
template <
class T_HashWordType,
class T_Endianness,
unsigned int T_BlockSize,
class T_Base = HashTransformation>
00075 class CRYPTOPP_NO_VTABLE IteratedHash :
public IteratedHashBase2<T_HashWordType, T_Endianness, T_Base>
00076 {
00077
public:
00078
enum {BLOCKSIZE = T_BlockSize};
00079 CRYPTOPP_COMPILE_ASSERT((BLOCKSIZE & (BLOCKSIZE - 1)) == 0);
00080
00081
protected:
00082 IteratedHash() {this->SetBlockSize(T_BlockSize);}
00083 };
00084
00085
00086
template <
class T_HashWordType,
class T_Endianness,
unsigned int T_BlockSize,
unsigned int T_StateSize,
class T_Transform,
unsigned int T_DigestSize = T_StateSize>
00087 class CRYPTOPP_NO_VTABLE IteratedHashWithStaticTransform
00088 :
public ClonableImpl<T_Transform, AlgorithmImpl<IteratedHash<T_HashWordType, T_Endianness, T_BlockSize>, T_Transform> >
00089 {
00090
public:
00091
enum {DIGESTSIZE = T_DigestSize};
00092 unsigned int DigestSize()
const {
return DIGESTSIZE;};
00093
00094
protected:
00095 IteratedHashWithStaticTransform()
00096 {
00097 this->SetStateSize(T_StateSize);
00098 Init();
00099 }
00100
void HashEndianCorrectedBlock(
const T_HashWordType *data) {T_Transform::Transform(this->m_digest, data);}
00101
void Init() {T_Transform::InitState(this->m_digest);}
00102 };
00103
00104
00105
00106
template <
class T,
class B,
class BASE>
void IteratedHashBase2<T, B, BASE>::TruncatedFinal(byte *digest,
unsigned int size)
00107 {
00108 this->ThrowIfInvalidTruncatedSize(size);
00109
00110 PadLastBlock(this->BlockSize() - 2*
sizeof(HashWordType));
00111 CorrectEndianess(this->m_data, this->m_data, this->BlockSize() - 2*
sizeof(HashWordType));
00112
00113 this->m_data[this->m_data.
size()-2] = B::ToEnum() ? this->GetBitCountHi() : this->GetBitCountLo();
00114 this->m_data[this->m_data.
size()-1] = B::ToEnum() ? this->GetBitCountLo() : this->GetBitCountHi();
00115
00116 HashEndianCorrectedBlock(this->m_data);
00117 CorrectEndianess(this->m_digest, this->m_digest, this->DigestSize());
00118 memcpy(digest, this->m_digest, size);
00119
00120 this->
Restart();
00121 }
00122
00123
template <
class T,
class B,
class BASE>
void IteratedHashBase2<T, B, BASE>::HashBlock(
const HashWordType *input)
00124 {
00125
if (NativeByteOrderIs(B::ToEnum()))
00126 HashEndianCorrectedBlock(input);
00127
else
00128 {
00129 ByteReverse(this->m_data.begin(), input, this->
BlockSize());
00130 HashEndianCorrectedBlock(this->m_data);
00131 }
00132 }
00133
00134 NAMESPACE_END
00135
00136
#endif