/************************************************* * Block Cipher Mode Source File * * (C) 1999-2007 The Botan Project * *************************************************/ #include #include namespace Botan { /************************************************* * Block Cipher Mode Constructor * *************************************************/ BlockCipherMode::BlockCipherMode(const std::string& cipher_name, const std::string& cipher_mode_name, u32bit iv_size, u32bit iv_meth, u32bit buf_mult) : BLOCK_SIZE(block_size_of(cipher_name)), BUFFER_SIZE(buf_mult * BLOCK_SIZE), IV_METHOD(iv_meth), mode_name(cipher_mode_name) { base_ptr = cipher = get_block_cipher(cipher_name); 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); } }