1 files changed, 113 insertions, 0 deletions
diff --git a/src/cipher/lion/lion.cpp b/src/cipher/lion/lion.cpp
new file mode 100644
index 000000000..009e98408
--- /dev/null
+++ b/src/cipher/lion/lion.cpp
@@ -0,0 +1,113 @@
+/*************************************************
+* Lion Source File                               *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/lion.h>
+#include <botan/lookup.h>
+#include <botan/xor_buf.h>
+#include <botan/parsing.h>
+
+namespace Botan {
+
+/*************************************************
+* Lion Encryption                                *
+*************************************************/
+void Lion::enc(const byte in[], byte out[]) const
+   {
+   SecureVector<byte> buffer(LEFT_SIZE);
+
+   xor_buf(buffer, in, key1, LEFT_SIZE);
+   cipher->set_key(buffer, LEFT_SIZE);
+   cipher->encrypt(in + LEFT_SIZE, out + LEFT_SIZE, RIGHT_SIZE);
+
+   hash->update(out + LEFT_SIZE, RIGHT_SIZE);
+   hash->final(buffer);
+   xor_buf(out, in, buffer, LEFT_SIZE);
+
+   xor_buf(buffer, out, key2, LEFT_SIZE);
+   cipher->set_key(buffer, LEFT_SIZE);
+   cipher->encrypt(out + LEFT_SIZE, RIGHT_SIZE);
+   }
+
+/*************************************************
+* Lion Decryption                                *
+*************************************************/
+void Lion::dec(const byte in[], byte out[]) const
+   {
+   SecureVector<byte> buffer(LEFT_SIZE);
+
+   xor_buf(buffer, in, key2, LEFT_SIZE);
+   cipher->set_key(buffer, LEFT_SIZE);
+   cipher->encrypt(in + LEFT_SIZE, out + LEFT_SIZE, RIGHT_SIZE);
+
+   hash->update(out + LEFT_SIZE, RIGHT_SIZE);
+   hash->final(buffer);
+   xor_buf(out, in, buffer, LEFT_SIZE);
+
+   xor_buf(buffer, out, key1, LEFT_SIZE);
+   cipher->set_key(buffer, LEFT_SIZE);
+   cipher->encrypt(out + LEFT_SIZE, RIGHT_SIZE);
+   }
+
+/*************************************************
+* Lion Key Schedule                              *
+*************************************************/
+void Lion::key(const byte key[], u32bit length)
+   {
+   clear();
+
+   key1.copy(key,              length / 2);
+   key2.copy(key + length / 2, length / 2);
+   }
+
+/*************************************************
+* Return the name of this type                   *
+*************************************************/
+std::string Lion::name() const
+   {
+   return "Lion(" + hash->name() + "," +
+                    cipher->name() + "," +
+                    to_string(BLOCK_SIZE) + ")";
+   }
+
+/*************************************************
+* Return a clone of this object                  *
+*************************************************/
+BlockCipher* Lion::clone() const
+   {
+   return new Lion(hash->name(), cipher->name(), BLOCK_SIZE);
+   }
+
+/*************************************************
+* Clear memory of sensitive data                 *
+*************************************************/
+void Lion::clear() throw()
+   {
+   hash->clear();
+   cipher->clear();
+   key1.clear();
+   key2.clear();
+   }
+
+/*************************************************
+* Lion Constructor                               *
+*************************************************/
+Lion::Lion(const std::string& hash_name, const std::string& sc_name,
+           u32bit block_len) :
+   BlockCipher(block_len, 2, 2*output_length_of(hash_name), 2),
+   LEFT_SIZE(output_length_of(hash_name)), RIGHT_SIZE(BLOCK_SIZE - LEFT_SIZE)
+   {
+   hash = get_hash(hash_name);
+   cipher = get_stream_cipher(sc_name);
+
+   if(2*LEFT_SIZE + 1 > BLOCK_SIZE)
+      throw Invalid_Argument(name() + ": Chosen block size is too small");
+   if(!cipher->valid_keylength(LEFT_SIZE))
+      throw Exception(name() + ": This stream/hash combination is invalid");
+
+   key1.create(LEFT_SIZE);
+   key2.create(LEFT_SIZE);
+   }
+
+}