/* * Block Cipher Mode * (C) 1999-2007 Jack Lloyd * * Distributed under the terms of the Botan license */ #include namespace Botan { /* * Block Cipher Mode Constructor */ BlockCipherMode::BlockCipherMode(BlockCipher* cipher_ptr, const std::string& cipher_mode_name, u32bit iv_size, u32bit iv_meth, u32bit buf_mult) : BLOCK_SIZE(cipher_ptr->BLOCK_SIZE), BUFFER_SIZE(buf_mult * BLOCK_SIZE), IV_METHOD(iv_meth), mode_name(cipher_mode_name) { cipher = cipher_ptr; buffer.create(BUFFER_SIZE); state.create(iv_size); position = 0; } /* * Return the name of this type */ std::string BlockCipherMode::name() const { return (cipher->name() + "/" + mode_name); } /* * Set the IV */ void BlockCipherMode::set_iv(const InitializationVector& new_iv) { if(new_iv.length() != state.size()) throw Invalid_IV_Length(name(), new_iv.length()); state = new_iv.bits_of(); buffer.clear(); position = 0; if(IV_METHOD == 1) cipher->encrypt(state, buffer); else if(IV_METHOD == 2) cipher->encrypt(state); } }