diff options
author | lloyd <[email protected]> | 2008-11-08 19:46:52 +0000 |
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committer | lloyd <[email protected]> | 2008-11-08 19:46:52 +0000 |
commit | f1c459725da56fd8ed5766e7779300182fa26bcf (patch) | |
tree | 32295cec92df1155563ae8a535dc695d6800d7f6 /src/block/lion/lion.cpp | |
parent | 8dba7b5264403e781bbb86ff61850e4377dca7b9 (diff) |
Split ciphers into block and stream ciphers. Move base class headers
Diffstat (limited to 'src/block/lion/lion.cpp')
-rw-r--r-- | src/block/lion/lion.cpp | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/block/lion/lion.cpp b/src/block/lion/lion.cpp new file mode 100644 index 000000000..629badd3d --- /dev/null +++ b/src/block/lion/lion.cpp @@ -0,0 +1,112 @@ +/************************************************* +* Lion Source File * +* (C) 1999-2007 Jack Lloyd * +*************************************************/ + +#include <botan/lion.h> +#include <botan/xor_buf.h> +#include <botan/parsing.h> + +namespace Botan { + +/************************************************* +* Lion Encryption * +*************************************************/ +void Lion::enc(const byte in[], byte out[]) const + { + SecureVector<byte> buffer(LEFT_SIZE); + + xor_buf(buffer, in, key1, LEFT_SIZE); + cipher->set_key(buffer, LEFT_SIZE); + cipher->encrypt(in + LEFT_SIZE, out + LEFT_SIZE, RIGHT_SIZE); + + hash->update(out + LEFT_SIZE, RIGHT_SIZE); + hash->final(buffer); + xor_buf(out, in, buffer, LEFT_SIZE); + + xor_buf(buffer, out, key2, LEFT_SIZE); + cipher->set_key(buffer, LEFT_SIZE); + cipher->encrypt(out + LEFT_SIZE, RIGHT_SIZE); + } + +/************************************************* +* Lion Decryption * +*************************************************/ +void Lion::dec(const byte in[], byte out[]) const + { + SecureVector<byte> buffer(LEFT_SIZE); + + xor_buf(buffer, in, key2, LEFT_SIZE); + cipher->set_key(buffer, LEFT_SIZE); + cipher->encrypt(in + LEFT_SIZE, out + LEFT_SIZE, RIGHT_SIZE); + + hash->update(out + LEFT_SIZE, RIGHT_SIZE); + hash->final(buffer); + xor_buf(out, in, buffer, LEFT_SIZE); + + xor_buf(buffer, out, key1, LEFT_SIZE); + cipher->set_key(buffer, LEFT_SIZE); + cipher->encrypt(out + LEFT_SIZE, RIGHT_SIZE); + } + +/************************************************* +* Lion Key Schedule * +*************************************************/ +void Lion::key(const byte key[], u32bit length) + { + clear(); + + key1.copy(key, length / 2); + key2.copy(key + length / 2, length / 2); + } + +/************************************************* +* Return the name of this type * +*************************************************/ +std::string Lion::name() const + { + return "Lion(" + hash->name() + "," + + cipher->name() + "," + + to_string(BLOCK_SIZE) + ")"; + } + +/************************************************* +* Return a clone of this object * +*************************************************/ +BlockCipher* Lion::clone() const + { + return new Lion(hash->clone(), cipher->clone(), BLOCK_SIZE); + } + +/************************************************* +* Clear memory of sensitive data * +*************************************************/ +void Lion::clear() throw() + { + hash->clear(); + cipher->clear(); + key1.clear(); + key2.clear(); + } + +/************************************************* +* Lion Constructor * +*************************************************/ +Lion::Lion(HashFunction* hash_in, StreamCipher* sc_in, u32bit block_len) : + BlockCipher(std::max<u32bit>(2*hash_in->OUTPUT_LENGTH + 1, block_len), + 2, 2*hash_in->OUTPUT_LENGTH, 2), + LEFT_SIZE(hash_in->OUTPUT_LENGTH), + RIGHT_SIZE(BLOCK_SIZE - LEFT_SIZE), + hash(hash_in), + cipher(sc_in) + { + if(2*LEFT_SIZE + 1 > BLOCK_SIZE) + throw Invalid_Argument(name() + ": Chosen block size is too small"); + if(!cipher->valid_keylength(LEFT_SIZE)) + throw Exception(name() + ": This stream/hash combination is invalid"); + + key1.create(LEFT_SIZE); + key2.create(LEFT_SIZE); + } + +} |