Move lib into src

1 files changed, 93 insertions, 0 deletions

diff --git a/src/lib/stream/ofb/ofb.cpp b/src/lib/stream/ofb/ofb.cpp
new file mode 100644
index 000000000..1137a58af
--- /dev/null
+++ b/src/lib/stream/ofb/ofb.cpp
@@ -0,0 +1,93 @@
+/*
+* OFB Mode
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/ofb.h>
+#include <botan/internal/xor_buf.h>
+#include <algorithm>
+
+namespace Botan {
+
+/*
+* OFB Constructor
+*/
+OFB::OFB(BlockCipher* ciph) : permutation(ciph)
+   {
+   position = 0;
+   buffer.resize(permutation->block_size());
+   }
+
+/*
+* OFB Destructor
+*/
+OFB::~OFB()
+   {
+   delete permutation;
+   }
+
+/*
+* Zeroize
+*/
+void OFB::clear()
+   {
+   permutation->clear();
+   zeroise(buffer);
+   position = 0;
+   }
+
+/*
+* Set the key
+*/
+void OFB::key_schedule(const byte key[], size_t key_len)
+   {
+   permutation->set_key(key, key_len);
+
+   // Set a default all-zeros IV
+   set_iv(nullptr, 0);
+   }
+
+/*
+* Return the name of this type
+*/
+std::string OFB::name() const
+   {
+   return ("OFB(" + permutation->name() + ")");
+   }
+
+/*
+* CTR-BE Encryption/Decryption
+*/
+void OFB::cipher(const byte in[], byte out[], size_t length)
+   {
+   while(length >= buffer.size() - position)
+      {
+      xor_buf(out, in, &buffer[position], buffer.size() - position);
+      length -= (buffer.size() - position);
+      in += (buffer.size() - position);
+      out += (buffer.size() - position);
+      permutation->encrypt(buffer);
+      position = 0;
+      }
+   xor_buf(out, in, &buffer[position], length);
+   position += length;
+   }
+
+/*
+* Set CTR-BE IV
+*/
+void OFB::set_iv(const byte iv[], size_t iv_len)
+   {
+   if(!valid_iv_length(iv_len))
+      throw Invalid_IV_Length(name(), iv_len);
+
+   zeroise(buffer);
+   buffer_insert(buffer, 0, iv, iv_len);
+
+   permutation->encrypt(buffer);
+   position = 0;
+   }
+
+}