From a3b6ece7ab341b5b14135baeccea7d5e4c086771 Mon Sep 17 00:00:00 2001
From: weidai <weidai11@users.noreply.github.com>
Date: Fri, 4 Oct 2002 17:31:41 +0000
Subject: Initial revision

---
 gost.h | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 gost.h

(limited to 'gost.h')

diff --git a/gost.h b/gost.h
new file mode 100644
index 00000000..332f36a2
--- /dev/null
+++ b/gost.h
@@ -0,0 +1,57 @@
+#ifndef CRYPTOPP_GOST_H
+#define CRYPTOPP_GOST_H
+
+/** \file
+*/
+
+#include "seckey.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+struct GOST_Info : public FixedBlockSize<8>, public FixedKeyLength<32>
+{
+	static const char *StaticAlgorithmName() {return "GOST";}
+};
+
+/// <a href="http://www.weidai.com/scan-mirror/cs.html#GOST">GOST</a>
+class GOST : public GOST_Info, public BlockCipherDocumentation
+{
+	class Base : public BlockCipherBaseTemplate<GOST_Info>
+	{
+	public:
+		void UncheckedSetKey(CipherDir direction, const byte *userKey, unsigned int length);
+
+	protected:
+		static void PrecalculateSTable();
+
+		static const byte sBox[8][16];
+		static bool sTableCalculated;
+		static word32 sTable[4][256];
+
+		FixedSizeSecBlock<word32, 8> key;
+	};
+
+	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;
+};
+
+typedef GOST::Encryption GOSTEncryption;
+typedef GOST::Decryption GOSTDecryption;
+
+NAMESPACE_END
+
+#endif
-- 
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