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// Sha1.h
// This file is based on public domain
// Steve Reid and Wei Dai's code from Crypto++
#ifndef __SHA1_H
#define __SHA1_H
#include <stddef.h>
#include "../../../Common/Types.h"
// Sha1 implementation in RAR before version 3.60 has bug:
// it changes data bytes in some cases.
// So this class supports both versions: normal_SHA and rar3Mode
namespace NCrypto {
namespace NSha1 {
const unsigned int kBlockSize = 64;
const unsigned int kDigestSize = 20;
const unsigned int kBlockSizeInWords = (kBlockSize >> 2);
const unsigned int kDigestSizeInWords = (kDigestSize >> 2);
class CContextBase
{
protected:
UInt32 _state[5];
UInt64 _count;
void UpdateBlock(UInt32 *data, bool returnRes = false)
{
GetBlockDigest(data, _state, returnRes);
_count++;
}
public:
void Init();
void GetBlockDigest(UInt32 *blockData, UInt32 *destDigest, bool returnRes = false);
// PrepareBlock can be used only when size <= 13. size in Words
void PrepareBlock(UInt32 *block, unsigned int size) const;
};
class CContextBase2: public CContextBase
{
protected:
unsigned int _count2;
UInt32 _buffer[kBlockSizeInWords];
void UpdateBlock() { CContextBase::UpdateBlock(_buffer); }
public:
void Init() { CContextBase::Init(); _count2 = 0; }
};
class CContext: public CContextBase2
{
public:
void Update(Byte *data, size_t size, bool rar350Mode = false);
void Update(const Byte *data, size_t size) { Update((Byte *)data, size, false); }
void Final(Byte *digest);
};
class CContext32: public CContextBase2
{
public:
void Update(const UInt32 *data, size_t size);
void Final(UInt32 *digest);
};
}}
#endif
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