Initial checkin1.5.6

1 files changed, 114 insertions, 0 deletions

diff --git a/src/lubyrack.cpp b/src/lubyrack.cpp
new file mode 100644
index 000000000..0c3d4b284
--- /dev/null
+++ b/src/lubyrack.cpp
@@ -0,0 +1,114 @@
+/*************************************************
+* Luby-Rackoff Source File                       *
+* (C) 1999-2006 The Botan Project                *
+*************************************************/
+
+#include <botan/lubyrack.h>
+#include <botan/lookup.h>
+#include <botan/bit_ops.h>
+
+namespace Botan {
+
+/*************************************************
+* Luby-Rackoff Encryption                        *
+*************************************************/
+void LubyRackoff::enc(const byte in[], byte out[]) const
+   {
+   const u32bit OUTPUT_LENGTH = hash->OUTPUT_LENGTH;
+
+   SecureVector<byte> buffer(OUTPUT_LENGTH);
+   hash->update(K1);
+   hash->update(in, OUTPUT_LENGTH);
+   hash->final(buffer);
+   xor_buf(out + OUTPUT_LENGTH, in + OUTPUT_LENGTH, buffer, OUTPUT_LENGTH);
+
+   hash->update(K2);
+   hash->update(out + OUTPUT_LENGTH, OUTPUT_LENGTH);
+   hash->final(buffer);
+   xor_buf(out, in, buffer, OUTPUT_LENGTH);
+
+   hash->update(K1);
+   hash->update(out, OUTPUT_LENGTH);
+   hash->final(buffer);
+   xor_buf(out + OUTPUT_LENGTH, buffer, OUTPUT_LENGTH);
+
+   hash->update(K2);
+   hash->update(out + OUTPUT_LENGTH, OUTPUT_LENGTH);
+   hash->final(buffer);
+   xor_buf(out, buffer, OUTPUT_LENGTH);
+   }
+
+/*************************************************
+* Luby-Rackoff Decryption                        *
+*************************************************/
+void LubyRackoff::dec(const byte in[], byte out[]) const
+   {
+   const u32bit OUTPUT_LENGTH = hash->OUTPUT_LENGTH;
+
+   SecureVector<byte> buffer(OUTPUT_LENGTH);
+   hash->update(K2);
+   hash->update(in + OUTPUT_LENGTH, OUTPUT_LENGTH);
+   hash->final(buffer);
+   xor_buf(out, in, buffer, OUTPUT_LENGTH);
+
+   hash->update(K1);
+   hash->update(out, OUTPUT_LENGTH);
+   hash->final(buffer);
+   xor_buf(out + OUTPUT_LENGTH, in + OUTPUT_LENGTH, buffer, OUTPUT_LENGTH);
+
+   hash->update(K2);
+   hash->update(out + OUTPUT_LENGTH, OUTPUT_LENGTH);
+   hash->final(buffer);
+   xor_buf(out, buffer, OUTPUT_LENGTH);
+
+   hash->update(K1);
+   hash->update(out, OUTPUT_LENGTH);
+   hash->final(buffer);
+   xor_buf(out + OUTPUT_LENGTH, buffer, OUTPUT_LENGTH);
+   }
+
+/*************************************************
+* Luby-Rackoff Key Schedule                      *
+*************************************************/
+void LubyRackoff::key(const byte key[], u32bit length)
+   {
+   K1.set(key, length / 2);
+   K2.set(key + length / 2, length / 2);
+   }
+
+/*************************************************
+* Clear memory of sensitive data                 *
+*************************************************/
+void LubyRackoff::clear() throw()
+   {
+   K1.clear();
+   K2.clear();
+   hash->clear();
+   }
+
+/*************************************************
+* Return a clone of this object                  *
+*************************************************/
+BlockCipher* LubyRackoff::clone() const
+   {
+   return new LubyRackoff(hash->name());
+   }
+
+/*************************************************
+* Return the name of this type                   *
+*************************************************/
+std::string LubyRackoff::name() const
+   {
+   return "Luby-Rackoff(" + hash->name() + ")";
+   }
+
+/*************************************************
+* Luby-Rackoff Constructor                       *
+*************************************************/
+LubyRackoff::LubyRackoff(const std::string& hash_name) :
+   BlockCipher(2*output_length_of(hash_name), 2, 32, 2),
+   hash(get_hash(hash_name))
+   {
+   }
+
+}