1 files changed, 78 insertions, 0 deletions
diff --git a/src/lib/block/tea/tea.cpp b/src/lib/block/tea/tea.cpp
new file mode 100644
index 000000000..2accab700
--- /dev/null
+++ b/src/lib/block/tea/tea.cpp
@@ -0,0 +1,78 @@
+/*
+* TEA
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/tea.h>
+#include <botan/loadstor.h>
+
+namespace Botan {
+
+/*
+* TEA Encryption
+*/
+void TEA::encrypt_n(const byte in[], byte out[], size_t blocks) const
+   {
+   for(size_t i = 0; i != blocks; ++i)
+      {
+      u32bit L = load_be<u32bit>(in, 0);
+      u32bit R = load_be<u32bit>(in, 1);
+
+      u32bit S = 0;
+      for(size_t 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);
+
+      in += BLOCK_SIZE;
+      out += BLOCK_SIZE;
+      }
+   }
+
+/*
+* TEA Decryption
+*/
+void TEA::decrypt_n(const byte in[], byte out[], size_t blocks) const
+   {
+   for(size_t i = 0; i != blocks; ++i)
+      {
+      u32bit L = load_be<u32bit>(in, 0);
+      u32bit R = load_be<u32bit>(in, 1);
+
+      u32bit S = 0xC6EF3720;
+      for(size_t 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);
+
+      in += BLOCK_SIZE;
+      out += BLOCK_SIZE;
+      }
+   }
+
+/*
+* TEA Key Schedule
+*/
+void TEA::key_schedule(const byte key[], size_t)
+   {
+   K.resize(4);
+   for(size_t i = 0; i != 4; ++i)
+      K[i] = load_be<u32bit>(key, i);
+   }
+
+void TEA::clear()
+   {
+   zap(K);
+   }
+
+}