From 2c8a618a039af991fe4e0917175fb11d257a763d Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Thu, 23 Nov 2017 11:41:40 -0500
Subject: Add SM4 block ciphers (GH #540)

---
 sm4.h | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 sm4.h

(limited to 'sm4.h')

diff --git a/sm4.h b/sm4.h
new file mode 100644
index 00000000..37cf4727
--- /dev/null
+++ b/sm4.h
@@ -0,0 +1,75 @@
+// sm4.h - written and placed in the public domain by Jeffrey Walton and Han Lulu
+
+//! \file sm4.h
+//! \brief Classes for the SM4 block cipher
+//! \details SM4 is a Chinese national block cipher.
+//! \sa <A HREF="http://eprint.iacr.org/2008/329.pdf">SMS4 Encryption Algorithm for Wireless Networks</A>
+//! \since Crypto++ 6.0
+
+#ifndef CRYPTOPP_SM4_H
+#define CRYPTOPP_SM4_H
+
+#include "config.h"
+#include "seckey.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+//! \class SM4_Info
+//! \brief SM4 block cipher information
+//! \since Crypto++ 6.0
+struct SM4_Info : public FixedBlockSize<16>, FixedKeyLength<16>
+{
+    static const std::string StaticAlgorithmName()
+    {
+        return "SM4";
+    }
+};
+
+//! \file sm4.h
+//! \brief Classes for the SM4 block cipher
+//! \details SM4 is a Chinese national block cipher.
+//! \sa <A HREF="http://eprint.iacr.org/2008/329.pdf">SMS4 Encryption Algorithm for Wireless Networks</A>
+//! \since Crypto++ 6.0
+class CRYPTOPP_NO_VTABLE SM4 : public SM4_Info, public BlockCipherDocumentation
+{
+public:
+    //! \brief SM4 block cipher transformation functions
+    //! \details Provides implementation common to encryption and decryption
+    //! \since Crypto++ 6.0
+    class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<SM4_Info>
+    {
+    protected:
+        void UncheckedSetKey(const byte *userKey, unsigned int keyLength, const NameValuePairs &params);
+    protected:
+        SecBlock<word32, AllocatorWithCleanup<word32> > m_rkeys;
+        mutable SecBlock<word32, AllocatorWithCleanup<word32> > m_wspace;
+    };
+
+    //! \brief Provides implementation for encryption transformation
+    //! \details Enc provides implementation for encryption transformation. All key
+    //!   sizes are supported.
+    //! \since Crypto++ 6.0
+    class CRYPTOPP_NO_VTABLE Enc : public Base
+    {
+    protected:
+        void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
+    };
+
+    //! \brief Provides implementation for encryption transformation
+    //! \details Dec provides implementation for decryption transformation. All key
+    //!   sizes are supported.
+    //! \since Crypto++ 6.0
+    class CRYPTOPP_NO_VTABLE Dec : public Base
+    {
+    protected:
+        void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
+    };
+
+    typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
+    typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
+};
+
+NAMESPACE_END
+
+#endif // CRYPTOPP_SM4_H
-- 
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