?? ofb.cpp
字號:
/************************************************** OFB Mode Source File ** (C) 1999-2002 The Botan Project **************************************************/#include <botan/ofb.h>namespace Botan {/************************************************** OFB Constructor **************************************************/OFB::OFB(const std::string& cipher_name, const SymmetricKey& key, const BlockCipherModeIV& iv) : BlockCipherMode(cipher_name, "OFB", key, iv) { if(!valid_iv_length(iv.length())) throw Invalid_IV_Length(name(), iv.length()); cipher->encrypt(state); }/************************************************** OFB Encryption/Decryption **************************************************/void OFB::write(const byte input[], u32bit length) { while(length) { u32bit copied = std::min(BLOCK_SIZE - position, length); xor_buf(buffer, input, state + position, copied); send(buffer, copied); input += copied; length -= copied; position += copied; if(position == BLOCK_SIZE) { cipher->encrypt(state); position = 0; } } }}
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