diff options
| author | watcherhd <watcherhd@e753b5eb-9565-29b2-b5c5-2cc6f99dfbcb> | 2011-04-21 14:14:52 +0000 |
|---|---|---|
| committer | watcherhd <watcherhd@e753b5eb-9565-29b2-b5c5-2cc6f99dfbcb> | 2011-04-21 14:14:52 +0000 |
| commit | cb4a46e7fbe62d788e66ed6121c717a2d22a4d7c (patch) | |
| tree | 30df260fdc5a1b5a7049c2f8cac8b7ef17513d6d /cryptopp/crypto/crc.h | |
| parent | 19b6f534d2e784a1e120bf52c4aa07004798f473 (diff) | |
svn.miranda.im is moving to a new home!
git-svn-id: http://miranda-plugins.googlecode.com/svn/trunk@7 e753b5eb-9565-29b2-b5c5-2cc6f99dfbcb
Diffstat (limited to 'cryptopp/crypto/crc.h')
| -rw-r--r-- | cryptopp/crypto/crc.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/cryptopp/crypto/crc.h b/cryptopp/crypto/crc.h new file mode 100644 index 0000000..ffe90f4 --- /dev/null +++ b/cryptopp/crypto/crc.h @@ -0,0 +1,41 @@ +#ifndef CRYPTOPP_CRC32_H
+#define CRYPTOPP_CRC32_H
+
+#include "cryptlib.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+const word32 CRC32_NEGL = 0xffffffffL;
+
+#ifdef IS_LITTLE_ENDIAN
+#define CRC32_INDEX(c) (c & 0xff)
+#define CRC32_SHIFTED(c) (c >> 8)
+#else
+#define CRC32_INDEX(c) (c >> 24)
+#define CRC32_SHIFTED(c) (c << 8)
+#endif
+
+//! CRC Checksum Calculation
+class CRC32 : public HashTransformation
+{
+public:
+ CRYPTOPP_CONSTANT(DIGESTSIZE = 4)
+ CRC32();
+ void Update(const byte *input, size_t length);
+ void TruncatedFinal(byte *hash, size_t size);
+ unsigned int DigestSize() const {return DIGESTSIZE;}
+ std::string AlgorithmName() const {return "CRC32";}
+
+ void UpdateByte(byte b) {m_crc = m_tab[CRC32_INDEX(m_crc) ^ b] ^ CRC32_SHIFTED(m_crc);}
+ byte GetCrcByte(size_t i) const {return ((byte *)&(m_crc))[i];}
+
+private:
+ void Reset() {m_crc = CRC32_NEGL;}
+
+ static const word32 m_tab[256];
+ word32 m_crc;
+};
+
+NAMESPACE_END
+
+#endif
|