Initial revision

1 files changed, 91 insertions, 0 deletions

diff --git a/cast.h b/cast.h
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--- /dev/null
+++ b/cast.h
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+#ifndef CRYPTOPP_CAST_H
+#define CRYPTOPP_CAST_H
+
+/** \file
+*/
+
+#include "seckey.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+class CAST
+{
+protected:
+	static const word32 S[8][256];
+};
+
+//! .
+struct CAST128_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 5, 16>
+{
+	static const char *StaticAlgorithmName() {return "CAST-128";}
+};
+
+/// <a href="http://www.weidai.com/scan-mirror/cs.html#CAST-128">CAST-128</a>
+class CAST128 : public CAST128_Info, public BlockCipherDocumentation
+{
+	class Base : public CAST, public BlockCipherBaseTemplate<CAST128_Info>
+	{
+	public:
+		void UncheckedSetKey(CipherDir direction, const byte *userKey, unsigned int length);
+
+	protected:
+		bool reduced;
+		FixedSizeSecBlock<word32, 32> K;
+	};
+
+	class Enc : public Base
+	{
+	public:
+		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
+	};
+
+	class Dec : public Base
+	{
+	public:
+		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
+	};
+
+public:
+	typedef BlockCipherTemplate<ENCRYPTION, Enc> Encryption;
+	typedef BlockCipherTemplate<DECRYPTION, Dec> Decryption;
+};
+
+//! .
+struct CAST256_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32>
+{
+	static const char *StaticAlgorithmName() {return "CAST-256";}
+};
+
+//! <a href="http://www.weidai.com/scan-mirror/cs.html#CAST-256">CAST-256</a>
+class CAST256 : public CAST256_Info, public BlockCipherDocumentation
+{
+	class Base : public CAST, public BlockCipherBaseTemplate<CAST256_Info>
+	{
+	public:
+		void UncheckedSetKey(CipherDir direction, const byte *userKey, unsigned int length = 8);
+		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
+
+	protected:
+		static const word32 t_m[8][24];
+		static const unsigned int t_r[8][24];
+
+		static void Omega(int i, word32 kappa[8]);
+
+		FixedSizeSecBlock<word32, 8*12> K;
+	};
+
+public:
+	typedef BlockCipherTemplate<ENCRYPTION, Base> Encryption;
+	typedef BlockCipherTemplate<DECRYPTION, Base> Decryption;
+};
+
+typedef CAST128::Encryption CAST128Encryption;
+typedef CAST128::Decryption CAST128Decryption;
+
+typedef CAST256::Encryption CAST256Encryption;
+typedef CAST256::Decryption CAST256Decryption;
+
+NAMESPACE_END
+
+#endif