1 files changed, 107 insertions, 0 deletions
diff --git a/src/algo_filt.cpp b/src/algo_filt.cpp
new file mode 100644
index 000000000..2c8402601
--- /dev/null
+++ b/src/algo_filt.cpp
@@ -0,0 +1,107 @@
+/*************************************************
+* Filters Source File                            *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/filters.h>
+#include <botan/lookup.h>
+#include <algorithm>
+
+namespace Botan {
+
+/*************************************************
+* StreamCipher_Filter Constructor                *
+*************************************************/
+StreamCipher_Filter::StreamCipher_Filter(const std::string& sc_name) :
+   buffer(DEFAULT_BUFFERSIZE)
+   {
+   base_ptr = cipher = get_stream_cipher(sc_name);
+   }
+
+/*************************************************
+* StreamCipher_Filter Constructor                *
+*************************************************/
+StreamCipher_Filter::StreamCipher_Filter(const std::string& sc_name,
+                                         const SymmetricKey& key) :
+   buffer(DEFAULT_BUFFERSIZE)
+   {
+   base_ptr = cipher = get_stream_cipher(sc_name);
+   cipher->set_key(key);
+   }
+
+/*************************************************
+* Set the IV of a stream cipher                  *
+*************************************************/
+void StreamCipher_Filter::set_iv(const InitializationVector& iv)
+   {
+   cipher->resync(iv.begin(), iv.length());
+   }
+
+/*************************************************
+* Write data into a StreamCipher_Filter          *
+*************************************************/
+void StreamCipher_Filter::write(const byte input[], u32bit length)
+   {
+   while(length)
+      {
+      u32bit copied = std::min(length, buffer.size());
+      cipher->encrypt(input, buffer, copied);
+      send(buffer, copied);
+      input += copied;
+      length -= copied;
+      }
+   }
+
+/*************************************************
+* Hash_Filter Constructor                        *
+*************************************************/
+Hash_Filter::Hash_Filter(const std::string& hash_name, u32bit len) :
+   OUTPUT_LENGTH(len)
+   {
+   hash = get_hash(hash_name);
+   }
+
+/*************************************************
+* Complete a calculation by a Hash_Filter        *
+*************************************************/
+void Hash_Filter::end_msg()
+   {
+   SecureVector<byte> output = hash->final();
+   if(OUTPUT_LENGTH)
+      send(output, std::min(OUTPUT_LENGTH, output.size()));
+   else
+      send(output);
+   }
+
+/*************************************************
+* MAC_Filter Constructor                         *
+*************************************************/
+MAC_Filter::MAC_Filter(const std::string& mac_name, u32bit len) :
+   OUTPUT_LENGTH(len)
+   {
+   base_ptr = mac = get_mac(mac_name);
+   }
+
+/*************************************************
+* MAC_Filter Constructor                         *
+*************************************************/
+MAC_Filter::MAC_Filter(const std::string& mac_name, const SymmetricKey& key,
+                       u32bit len) : OUTPUT_LENGTH(len)
+   {
+   base_ptr = mac = get_mac(mac_name);
+   mac->set_key(key);
+   }
+
+/*************************************************
+* Complete a calculation by a MAC_Filter         *
+*************************************************/
+void MAC_Filter::end_msg()
+   {
+   SecureVector<byte> output = mac->final();
+   if(OUTPUT_LENGTH)
+      send(output, std::min(OUTPUT_LENGTH, output.size()));
+   else
+      send(output);
+   }
+
+}