diff options
| -rw-r--r-- | doc/examples/new_engine.cpp (renamed from doc/examples/xor_ciph.cpp) | 58 |
1 files changed, 31 insertions, 27 deletions
diff --git a/doc/examples/xor_ciph.cpp b/doc/examples/new_engine.cpp index 3174e103e..2f412a6b9 100644 --- a/doc/examples/xor_ciph.cpp +++ b/doc/examples/new_engine.cpp @@ -1,15 +1,13 @@ /* +* Adding an application specific engine * (C) 2004,2008 Jack Lloyd * * Distributed under the terms of the Botan license */ -/* - Adding a simple XOR cipher to the internal tables -*/ - #include <botan/stream_cipher.h> -#include <botan/init.h> +#include <botan/engine.h> + using namespace Botan; class XOR_Cipher : public StreamCipher @@ -25,43 +23,49 @@ class XOR_Cipher : public StreamCipher XOR_Cipher() : StreamCipher(1, 32) { mask_pos = 0; } private: - void cipher(const byte[], byte[], u32bit); - void key_schedule(const byte[], u32bit); + void cipher(const byte in[], byte out[], u32bit length) + { + for(u32bit j = 0; j != length; j++) + { + out[j] = in[j] ^ mask[mask_pos]; + mask_pos = (mask_pos + 1) % mask.size(); + } + } + + void key_schedule(const byte key[], u32bit length) + { + mask.set(key, length); + } SecureVector<byte> mask; u32bit mask_pos; }; -void XOR_Cipher::cipher(const byte in[], byte out[], u32bit length) +class Application_Engine : public Engine { - for(u32bit j = 0; j != length; j++) - { - out[j] = in[j] ^ mask[mask_pos]; - mask_pos = (mask_pos + 1) % mask.size(); - } - } - -void XOR_Cipher::key_schedule(const byte key[], u32bit length) - { - mask.set(key, length); - } + public: + std::string provider_name() const { return "application"; } + + StreamCipher* find_stream_cipher(const SCAN_Name& request, + Algorithm_Factory&) const + { + if(request.algo_name() == "XOR") + return new XOR_Cipher; + return 0; + } + }; -#include <fstream> +#include <botan/botan.h> #include <iostream> #include <string> -#include <vector> -#include <cstring> - -#include <botan/lookup.h> -#include <botan/filters.h> -#include <botan/libstate.h> int main() { Botan::LibraryInitializer init; - global_state().algorithm_factory().add_stream_cipher(new XOR_Cipher, "app"); + global_state().algorithm_factory().add_engine( + new Application_Engine); // a hex key value SymmetricKey key("010203040506070809101112AAFF"); |