1 files changed, 60 insertions, 0 deletions
diff --git a/src/tea.cpp b/src/tea.cpp
new file mode 100644
index 000000000..364b3c527
--- /dev/null
+++ b/src/tea.cpp
@@ -0,0 +1,60 @@
+/*************************************************
+* TEA Source File                                *
+* (C) 1999-2006 The Botan Project                *
+*************************************************/
+
+#include <botan/tea.h>
+#include <botan/bit_ops.h>
+
+namespace Botan {
+
+/*************************************************
+* TEA Encryption                                 *
+*************************************************/
+void TEA::enc(const byte in[], byte out[]) const
+   {
+   u32bit left  = make_u32bit(in[0], in[1], in[2], in[3]),
+          right = make_u32bit(in[4], in[5], in[6], in[7]);
+   u32bit sum = 0;
+   for(u32bit j = 0; j != 32; ++j)
+      {
+      sum   += 0x9E3779B9;
+      left  += ((right << 4) + K[0]) ^ (right + sum) ^ ((right >> 5) + K[1]);
+      right += ((left  << 4) + K[2]) ^ (left  + sum) ^ ((left  >> 5) + K[3]);
+      }
+   out[0] = get_byte(0, left);  out[1] = get_byte(1, left);
+   out[2] = get_byte(2, left);  out[3] = get_byte(3, left);
+   out[4] = get_byte(0, right); out[5] = get_byte(1, right);
+   out[6] = get_byte(2, right); out[7] = get_byte(3, right);
+   }
+
+/*************************************************
+* TEA Decryption                                 *
+*************************************************/
+void TEA::dec(const byte in[], byte out[]) const
+   {
+   u32bit left  = make_u32bit(in[0], in[1], in[2], in[3]),
+          right = make_u32bit(in[4], in[5], in[6], in[7]);
+   u32bit sum = 0xC6EF3720;
+   for(u32bit j = 0; j != 32; ++j)
+      {
+      right -= ((left  << 4) + K[2]) ^ (left  + sum) ^ ((left  >> 5) + K[3]);
+      left  -= ((right << 4) + K[0]) ^ (right + sum) ^ ((right >> 5) + K[1]);
+      sum   -= 0x9E3779B9;
+      }
+   out[0] = get_byte(0, left);  out[1] = get_byte(1, left);
+   out[2] = get_byte(2, left);  out[3] = get_byte(3, left);
+   out[4] = get_byte(0, right); out[5] = get_byte(1, right);
+   out[6] = get_byte(2, right); out[7] = get_byte(3, right);
+   }
+
+/*************************************************
+* TEA Key Schedule                               *
+*************************************************/
+void TEA::key(const byte key[], u32bit)
+   {
+   for(u32bit j = 0; j != 4; ++j)
+      K[j] = make_u32bit(key[4*j], key[4*j+1], key[4*j+2], key[4*j+3]);
+   }
+
+}