Initial revision

1 files changed, 101 insertions, 0 deletions

diff --git a/safer.h b/safer.h
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+++ b/safer.h
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+#ifndef CRYPTOPP_SAFER_H
+#define CRYPTOPP_SAFER_H
+
+/** \file
+*/
+
+#include "seckey.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+/// base class, do not use directly
+class SAFER
+{
+public:
+	class Base : public BlockCipher
+	{
+	public:
+		unsigned int GetAlignment() const {return 1;}
+		void UncheckedSetKey(CipherDir dir, const byte *userkey, unsigned int length, unsigned nof_rounds);
+
+		bool strengthened;
+		SecByteBlock keySchedule;
+		static const byte exp_tab[256];
+		static const byte log_tab[256];
+	};
+
+	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;
+	};
+};
+
+struct SAFER_K_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
+{
+	static const char *StaticAlgorithmName() {return "SAFER-K";}
+	static unsigned int DefaultRounds(unsigned int keylength) {return keylength == 8 ? 6 : 10;}
+};
+
+/// <a href="http://www.weidai.com/scan-mirror/cs.html#SAFER-K">SAFER-K</a>
+class SAFER_K : public SAFER_K_Info, public SAFER, public BlockCipherDocumentation
+{
+	class Enc : public BlockCipherBaseTemplate<SAFER_K_Info, SAFER::Enc>
+	{
+	public:
+		Enc() {strengthened = false;}
+	};
+
+	class Dec : public BlockCipherBaseTemplate<SAFER_K_Info, SAFER::Dec>
+	{
+	public:
+		Dec() {strengthened = false;}
+	};
+
+public:
+	typedef BlockCipherTemplate<ENCRYPTION, Enc> Encryption;
+	typedef BlockCipherTemplate<DECRYPTION, Dec> Decryption;
+};
+
+struct SAFER_SK_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
+{
+	static const char *StaticAlgorithmName() {return "SAFER-SK";}
+	static unsigned int DefaultRounds(unsigned int keylength) {return keylength == 8 ? 8 : 10;}
+};
+
+/// <a href="http://www.weidai.com/scan-mirror/cs.html#SAFER-SK">SAFER-SK</a>
+class SAFER_SK : public SAFER_SK_Info, public SAFER, public BlockCipherDocumentation
+{
+	class Enc : public BlockCipherBaseTemplate<SAFER_SK_Info, SAFER::Enc>
+	{
+	public:
+		Enc() {strengthened = true;}
+	};
+
+	class Dec : public BlockCipherBaseTemplate<SAFER_SK_Info, SAFER::Dec>
+	{
+	public:
+		Dec() {strengthened = true;}
+	};
+
+public:
+	typedef BlockCipherTemplate<ENCRYPTION, Enc> Encryption;
+	typedef BlockCipherTemplate<DECRYPTION, Dec> Decryption;
+};
+
+typedef SAFER_K::Encryption SAFER_K_Encryption;
+typedef SAFER_K::Decryption SAFER_K_Decryption;
+
+typedef SAFER_SK::Encryption SAFER_SK_Encryption;
+typedef SAFER_SK::Decryption SAFER_SK_Decryption;
+
+NAMESPACE_END
+
+#endif