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1 // Crypto/Sha1.h
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2 // This file is based on public domain
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3 // Steve Reid and Wei Dai's code from Crypto++
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4
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5 #ifndef __CRYPTO_SHA1_H
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6 #define __CRYPTO_SHA1_H
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7
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8 #include <stddef.h>
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9 #include "../../Common/Types.h"
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10
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11 // Sha1 implementation in RAR before version 3.60 has bug:
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12 // it changes data bytes in some cases.
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13 // So this class supports both versions: normal_SHA and rar3Mode
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14
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15 namespace NCrypto {
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16 namespace NSha1 {
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17
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18 const unsigned kBlockSize = 64;
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19 const unsigned kDigestSize = 20;
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20
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21 const unsigned kBlockSizeInWords = (kBlockSize >> 2);
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22 const unsigned kDigestSizeInWords = (kDigestSize >> 2);
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23
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24 class CContextBase
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25 {
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26 protected:
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27 UInt32 _state[5];
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28 UInt64 _count;
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29 void UpdateBlock(UInt32 *data, bool returnRes = false)
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30 {
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31 GetBlockDigest(data, _state, returnRes);
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32 _count++;
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33 }
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34 public:
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35 void Init();
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36 void GetBlockDigest(UInt32 *blockData, UInt32 *destDigest, bool returnRes = false);
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37 // PrepareBlock can be used only when size <= 13. size in Words
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38 void PrepareBlock(UInt32 *block, unsigned int size) const;
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39 };
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40
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41 class CContextBase2: public CContextBase
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42 {
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43 protected:
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44 unsigned _count2;
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45 UInt32 _buffer[kBlockSizeInWords];
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46 void UpdateBlock() { CContextBase::UpdateBlock(_buffer); }
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47 public:
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48 void Init() { CContextBase::Init(); _count2 = 0; }
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49 };
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50
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51 class CContext: public CContextBase2
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52 {
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53 public:
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54 void Update(Byte *data, size_t size, bool rar350Mode = false);
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55 void Update(const Byte *data, size_t size) { Update((Byte *)data, size, false); }
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56 void Final(Byte *digest);
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57 };
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58
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59 class CContext32: public CContextBase2
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60 {
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61 public:
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62 void Update(const UInt32 *data, size_t size);
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63 void Final(UInt32 *digest);
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64 };
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65
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66 }}
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67
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68 #endif
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