/* * DES * (C) 1999-2007 Jack Lloyd * * Distributed under the terms of the Botan license */ #include <botan/desx.h> #include <botan/internal/xor_buf.h> namespace Botan { /* * DESX Encryption */ void DESX::encrypt_n(const byte in[], byte out[], size_t blocks) const { for(size_t i = 0; i != blocks; ++i) { xor_buf(out, in, &K1[0], BLOCK_SIZE); des.encrypt(out); xor_buf(out, &K2[0], BLOCK_SIZE); in += BLOCK_SIZE; out += BLOCK_SIZE; } } /* * DESX Decryption */ void DESX::decrypt_n(const byte in[], byte out[], size_t blocks) const { for(size_t i = 0; i != blocks; ++i) { xor_buf(out, in, &K2[0], BLOCK_SIZE); des.decrypt(out); xor_buf(out, &K1[0], BLOCK_SIZE); in += BLOCK_SIZE; out += BLOCK_SIZE; } } /* * DESX Key Schedule */ void DESX::key_schedule(const byte key[], size_t) { K1.assign(key, key + 8); des.set_key(key + 8, 8); K2.assign(key + 16, key + 24); } void DESX::clear() { des.clear(); zap(K1); zap(K2); } }