1 files changed, 76 insertions, 0 deletions
diff --git a/src/modes/xts/xts.h b/src/modes/xts/xts.h
new file mode 100644
index 000000000..01558175b
--- /dev/null
+++ b/src/modes/xts/xts.h
@@ -0,0 +1,76 @@
+/*
+* XTS mode, from IEEE P1619
+* (C) 2009 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_XTS_H__
+#define BOTAN_XTS_H__
+
+#include <botan/basefilt.h>
+#include <botan/block_cipher.h>
+
+namespace Botan {
+
+/*
+* XTS Encryption
+*/
+class BOTAN_DLL XTS_Encryption : public Keyed_Filter
+   {
+   public:
+      void set_key(const SymmetricKey& key);
+      void set_iv(const InitializationVector& iv);
+
+      std::string name() const;
+
+      XTS_Encryption(BlockCipher* ciph);
+
+      XTS_Encryption(BlockCipher* ciph,
+                     const SymmetricKey& key,
+                     const InitializationVector& iv);
+
+      ~XTS_Encryption() { delete cipher; delete cipher2; }
+   private:
+      void write(const byte[], u32bit);
+      void end_msg();
+      void encrypt(const byte block[]);
+
+      BlockCipher* cipher;
+      BlockCipher* cipher2;
+      SecureVector<byte> tweak;
+      SecureVector<byte> buffer;
+      u32bit position;
+   };
+
+/*
+* XTS Decryption
+*/
+class BOTAN_DLL XTS_Decryption : public Keyed_Filter
+   {
+   public:
+      void set_key(const SymmetricKey& key);
+      void set_iv(const InitializationVector& iv);
+
+      std::string name() const;
+
+      XTS_Decryption(BlockCipher* ciph);
+
+      XTS_Decryption(BlockCipher* ciph,
+                     const SymmetricKey& key,
+                     const InitializationVector& iv);
+   private:
+      void write(const byte[], u32bit);
+      void end_msg();
+      void decrypt(const byte[]);
+
+      BlockCipher* cipher;
+      BlockCipher* cipher2;
+      SecureVector<byte> tweak;
+      SecureVector<byte> buffer;
+      u32bit position;
+   };
+
+}
+
+#endif