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/*************************************************
* Block Cipher Mode Source File *
* (C) 1999-2008 The Botan Project *
*************************************************/
#include <botan/modebase.h>
#include <botan/lookup.h>
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);
}
}
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