Split ciphers into block and stream ciphers. Move base class headers

3 files changed, 98 insertions, 0 deletions

diff --git a/src/block/tea/info.txt b/src/block/tea/info.txt
new file mode 100644
index 000000000..6a0e76b15
--- /dev/null
+++ b/src/block/tea/info.txt
@@ -0,0 +1,10 @@
+realname "TEA"
+
+define TEA
+
+load_on auto
+
+<add>
+tea.cpp
+tea.h
+</add>
diff --git a/src/block/tea/tea.cpp b/src/block/tea/tea.cpp
new file mode 100644
index 000000000..c5bd1b1fa
--- /dev/null
+++ b/src/block/tea/tea.cpp
@@ -0,0 +1,56 @@
+/*************************************************
+* TEA Source File                                *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/tea.h>
+#include <botan/loadstor.h>
+
+namespace Botan {
+
+/*************************************************
+* TEA Encryption                                 *
+*************************************************/
+void TEA::enc(const byte in[], byte out[]) const
+   {
+   u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1);
+
+   u32bit S = 0;
+   for(u32bit j = 0; j != 32; ++j)
+      {
+      S += 0x9E3779B9;
+      L += ((R << 4) + K[0]) ^ (R + S) ^ ((R >> 5) + K[1]);
+      R += ((L << 4) + K[2]) ^ (L + S) ^ ((L >> 5) + K[3]);
+      }
+
+   store_be(out, L, R);
+   }
+
+/*************************************************
+* TEA Decryption                                 *
+*************************************************/
+void TEA::dec(const byte in[], byte out[]) const
+   {
+   u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1);
+
+   u32bit S = 0xC6EF3720;
+   for(u32bit j = 0; j != 32; ++j)
+      {
+      R -= ((L << 4) + K[2]) ^ (L + S) ^ ((L >> 5) + K[3]);
+      L -= ((R << 4) + K[0]) ^ (R + S) ^ ((R >> 5) + K[1]);
+      S -= 0x9E3779B9;
+      }
+
+   store_be(out, L, R);
+   }
+
+/*************************************************
+* TEA Key Schedule                               *
+*************************************************/
+void TEA::key(const byte key[], u32bit)
+   {
+   for(u32bit j = 0; j != 4; ++j)
+      K[j] = load_be<u32bit>(key, j);
+   }
+
+}
diff --git a/src/block/tea/tea.h b/src/block/tea/tea.h
new file mode 100644
index 000000000..71d4e02f9
--- /dev/null
+++ b/src/block/tea/tea.h
@@ -0,0 +1,32 @@
+/*************************************************
+* TEA Header File                                *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#ifndef BOTAN_TEA_H__
+#define BOTAN_TEA_H__
+
+#include <botan/block_cipher.h>
+
+namespace Botan {
+
+/*************************************************
+* TEA                                            *
+*************************************************/
+class BOTAN_DLL TEA : public BlockCipher
+   {
+   public:
+      void clear() throw() { K.clear(); }
+      std::string name() const { return "TEA"; }
+      BlockCipher* clone() const { return new TEA; }
+      TEA() : BlockCipher(8, 16) {}
+   private:
+      void enc(const byte[], byte[]) const;
+      void dec(const byte[], byte[]) const;
+      void key(const byte[], u32bit);
+      SecureBuffer<u32bit, 4> K;
+   };
+
+}
+
+#endif