From 6894dca64c04936d07048c0e8cbf7e25858548c3 Mon Sep 17 00:00:00 2001
From: lloyd <lloyd@randombit.net>
Date: Fri, 10 Jan 2014 03:41:59 +0000
Subject: Move lib into src

---
 src/lib/block/lubyrack/info.txt     |   5 ++
 src/lib/block/lubyrack/lubyrack.cpp | 129 ++++++++++++++++++++++++++++++++++++
 src/lib/block/lubyrack/lubyrack.h   |  50 ++++++++++++++
 3 files changed, 184 insertions(+)
 create mode 100644 src/lib/block/lubyrack/info.txt
 create mode 100644 src/lib/block/lubyrack/lubyrack.cpp
 create mode 100644 src/lib/block/lubyrack/lubyrack.h

(limited to 'src/lib/block/lubyrack')

diff --git a/src/lib/block/lubyrack/info.txt b/src/lib/block/lubyrack/info.txt
new file mode 100644
index 000000000..1d83a0bac
--- /dev/null
+++ b/src/lib/block/lubyrack/info.txt
@@ -0,0 +1,5 @@
+define LUBY_RACKOFF 20131128
+
+<requires>
+hash
+</requires>
diff --git a/src/lib/block/lubyrack/lubyrack.cpp b/src/lib/block/lubyrack/lubyrack.cpp
new file mode 100644
index 000000000..9be079003
--- /dev/null
+++ b/src/lib/block/lubyrack/lubyrack.cpp
@@ -0,0 +1,129 @@
+/*
+* Luby-Rackoff
+* (C) 1999-2008 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/lubyrack.h>
+#include <botan/internal/xor_buf.h>
+
+namespace Botan {
+
+/*
+* Luby-Rackoff Encryption
+*/
+void LubyRackoff::encrypt_n(const byte in[], byte out[], size_t blocks) const
+   {
+   const size_t len = hash->output_length();
+
+   secure_vector<byte> buffer_vec(len);
+   byte* buffer = &buffer_vec[0];
+
+   for(size_t i = 0; i != blocks; ++i)
+      {
+      hash->update(K1);
+      hash->update(in, len);
+      hash->final(buffer);
+      xor_buf(out + len, in + len, buffer, len);
+
+      hash->update(K2);
+      hash->update(out + len, len);
+      hash->final(buffer);
+      xor_buf(out, in, buffer, len);
+
+      hash->update(K1);
+      hash->update(out, len);
+      hash->final(buffer);
+      xor_buf(out + len, buffer, len);
+
+      hash->update(K2);
+      hash->update(out + len, len);
+      hash->final(buffer);
+      xor_buf(out, buffer, len);
+
+      in += 2 * len;
+      out += 2 * len;
+      }
+   }
+
+/*
+* Luby-Rackoff Decryption
+*/
+void LubyRackoff::decrypt_n(const byte in[], byte out[], size_t blocks) const
+   {
+   const size_t len = hash->output_length();
+
+   secure_vector<byte> buffer_vec(len);
+   byte* buffer = &buffer_vec[0];
+
+   for(size_t i = 0; i != blocks; ++i)
+      {
+      hash->update(K2);
+      hash->update(in + len, len);
+      hash->final(buffer);
+      xor_buf(out, in, buffer, len);
+
+      hash->update(K1);
+      hash->update(out, len);
+      hash->final(buffer);
+      xor_buf(out + len, in + len, buffer, len);
+
+      hash->update(K2);
+      hash->update(out + len, len);
+      hash->final(buffer);
+      xor_buf(out, buffer, len);
+
+      hash->update(K1);
+      hash->update(out, len);
+      hash->final(buffer);
+      xor_buf(out + len, buffer, len);
+
+      in += 2 * len;
+      out += 2 * len;
+      }
+   }
+
+/*
+* Luby-Rackoff Key Schedule
+*/
+void LubyRackoff::key_schedule(const byte key[], size_t length)
+   {
+   K1.assign(key, key + (length / 2));
+   K2.assign(key + (length / 2), key + length);
+   }
+
+/*
+* Clear memory of sensitive data
+*/
+void LubyRackoff::clear()
+   {
+   zap(K1);
+   zap(K2);
+   hash->clear();
+   }
+
+/*
+* Return a clone of this object
+*/
+BlockCipher* LubyRackoff::clone() const
+   {
+   return new LubyRackoff(hash->clone());
+   }
+
+/*
+* Return the name of this type
+*/
+std::string LubyRackoff::name() const
+   {
+   return "Luby-Rackoff(" + hash->name() + ")";
+   }
+
+/*
+* Luby-Rackoff Constructor
+*/
+LubyRackoff::LubyRackoff(HashFunction* h) : hash(h)
+   {
+   }
+
+}
diff --git a/src/lib/block/lubyrack/lubyrack.h b/src/lib/block/lubyrack/lubyrack.h
new file mode 100644
index 000000000..e28c60be7
--- /dev/null
+++ b/src/lib/block/lubyrack/lubyrack.h
@@ -0,0 +1,50 @@
+/*
+* Luby-Rackoff
+* (C) 1999-2008 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_LUBY_RACKOFF_H__
+#define BOTAN_LUBY_RACKOFF_H__
+
+#include <botan/block_cipher.h>
+#include <botan/hash.h>
+
+namespace Botan {
+
+/**
+* Luby-Rackoff block cipher construction
+*/
+class BOTAN_DLL LubyRackoff : public BlockCipher
+   {
+   public:
+      void encrypt_n(const byte in[], byte out[], size_t blocks) const;
+      void decrypt_n(const byte in[], byte out[], size_t blocks) const;
+
+      size_t block_size() const { return 2 * hash->output_length(); }
+
+      Key_Length_Specification key_spec() const
+         {
+         return Key_Length_Specification(2, 32, 2);
+         }
+
+      void clear();
+      std::string name() const;
+      BlockCipher* clone() const;
+
+      /**
+      * @param hash function to use to form the block cipher
+      */
+      LubyRackoff(HashFunction* hash);
+      ~LubyRackoff() { delete hash; }
+   private:
+      void key_schedule(const byte[], size_t);
+
+      HashFunction* hash;
+      secure_vector<byte> K1, K2;
+   };
+
+}
+
+#endif
-- 
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