3 files changed, 120 insertions, 0 deletions
diff --git a/src/block/xtea/info.txt b/src/block/xtea/info.txt
new file mode 100644
index 000000000..0120a3bce
--- /dev/null
+++ b/src/block/xtea/info.txt
@@ -0,0 +1,10 @@
+realname "XTEA"
+
+define XTEA
+
+load_on auto
+
+<add>
+xtea.cpp
+xtea.h
+</add>
diff --git a/src/block/xtea/xtea.cpp b/src/block/xtea/xtea.cpp
new file mode 100644
index 000000000..db5c7effc
--- /dev/null
+++ b/src/block/xtea/xtea.cpp
@@ -0,0 +1,78 @@
+/*************************************************
+* XTEA Source File                               *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/xtea.h>
+#include <botan/loadstor.h>
+#include <botan/parsing.h>
+
+namespace Botan {
+
+/*************************************************
+* XTEA Encryption                                *
+*************************************************/
+void XTEA::enc(const byte in[], byte out[]) const
+   {
+   u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1);
+
+   for(u32bit j = 0; j != 32; ++j)
+      {
+      L += (((R << 4) ^ (R >> 5)) + R) ^ EK[2*j];
+      R += (((L << 4) ^ (L >> 5)) + L) ^ EK[2*j+1];
+      }
+
+   store_be(out, L, R);
+   }
+
+/*************************************************
+* XTEA Decryption                                *
+*************************************************/
+void XTEA::dec(const byte in[], byte out[]) const
+   {
+   u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1);
+
+   for(u32bit j = 32; j > 0; --j)
+      {
+      R -= (((L << 4) ^ (L >> 5)) + L) ^ EK[2*j - 1];
+      L -= (((R << 4) ^ (R >> 5)) + R) ^ EK[2*j - 2];
+      }
+
+   store_be(out, L, R);
+   }
+
+/*************************************************
+* XTEA Key Schedule                              *
+*************************************************/
+void XTEA::key(const byte key[], u32bit)
+   {
+   static const u32bit DELTAS[64] = {
+      0x00000000, 0x9E3779B9, 0x9E3779B9, 0x3C6EF372, 0x3C6EF372, 0xDAA66D2B,
+      0xDAA66D2B, 0x78DDE6E4, 0x78DDE6E4, 0x1715609D, 0x1715609D, 0xB54CDA56,
+      0xB54CDA56, 0x5384540F, 0x5384540F, 0xF1BBCDC8, 0xF1BBCDC8, 0x8FF34781,
+      0x8FF34781, 0x2E2AC13A, 0x2E2AC13A, 0xCC623AF3, 0xCC623AF3, 0x6A99B4AC,
+      0x6A99B4AC, 0x08D12E65, 0x08D12E65, 0xA708A81E, 0xA708A81E, 0x454021D7,
+      0x454021D7, 0xE3779B90, 0xE3779B90, 0x81AF1549, 0x81AF1549, 0x1FE68F02,
+      0x1FE68F02, 0xBE1E08BB, 0xBE1E08BB, 0x5C558274, 0x5C558274, 0xFA8CFC2D,
+      0xFA8CFC2D, 0x98C475E6, 0x98C475E6, 0x36FBEF9F, 0x36FBEF9F, 0xD5336958,
+      0xD5336958, 0x736AE311, 0x736AE311, 0x11A25CCA, 0x11A25CCA, 0xAFD9D683,
+      0xAFD9D683, 0x4E11503C, 0x4E11503C, 0xEC48C9F5, 0xEC48C9F5, 0x8A8043AE,
+      0x8A8043AE, 0x28B7BD67, 0x28B7BD67, 0xC6EF3720 };
+
+   static const byte KEY_INDEX[64] = {
+      0x00, 0x03, 0x01, 0x02, 0x02, 0x01, 0x03, 0x00, 0x00, 0x00, 0x01, 0x03,
+      0x02, 0x02, 0x03, 0x01, 0x00, 0x00, 0x01, 0x00, 0x02, 0x03, 0x03, 0x02,
+      0x00, 0x01, 0x01, 0x01, 0x02, 0x00, 0x03, 0x03, 0x00, 0x02, 0x01, 0x01,
+      0x02, 0x01, 0x03, 0x00, 0x00, 0x03, 0x01, 0x02, 0x02, 0x01, 0x03, 0x01,
+      0x00, 0x00, 0x01, 0x03, 0x02, 0x02, 0x03, 0x02, 0x00, 0x01, 0x01, 0x00,
+      0x02, 0x03, 0x03, 0x02 };
+
+   SecureBuffer<u32bit, 4> UK;
+   for(u32bit j = 0; j != 4; ++j)
+      UK[j] = load_be<u32bit>(key, j);
+
+   for(u32bit j = 0; j != 64; ++j)
+      EK[j] = DELTAS[j] + UK[KEY_INDEX[j]];
+   }
+
+}
diff --git a/src/block/xtea/xtea.h b/src/block/xtea/xtea.h
new file mode 100644
index 000000000..03b41f683
--- /dev/null
+++ b/src/block/xtea/xtea.h
@@ -0,0 +1,32 @@
+/*************************************************
+* XTEA Header File                               *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#ifndef BOTAN_XTEA_H__
+#define BOTAN_XTEA_H__
+
+#include <botan/block_cipher.h>
+
+namespace Botan {
+
+/*************************************************
+* XTEA                                           *
+*************************************************/
+class BOTAN_DLL XTEA : public BlockCipher
+   {
+   public:
+      void clear() throw() { EK.clear(); }
+      std::string name() const { return "XTEA"; }
+      BlockCipher* clone() const { return new XTEA; }
+      XTEA() : BlockCipher(8, 16) {}
+   private:
+      void enc(const byte[], byte[]) const;
+      void dec(const byte[], byte[]) const;
+      void key(const byte[], u32bit);
+      SecureBuffer<u32bit, 64> EK;
+   };
+
+}
+
+#endif