4.63

CPP/7zip/Crypto/Sha1.h

@@ -0,0 +1,68 @@
+// Crypto/Sha1.h
+// This file is based on public domain
+// Steve Reid and Wei Dai's code from Crypto++
+
+#ifndef __CRYPTO_SHA1_H
+#define __CRYPTO_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 kBlockSize = 64;
+const unsigned kDigestSize = 20;
+
+const unsigned kBlockSizeInWords = (kBlockSize >> 2);
+const unsigned 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 _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