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/*
* ECB Mode
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/ecb.h>
namespace Botan {
/*
* Verify the IV is not set
*/
bool ECB::valid_iv_size(u32bit iv_size) const
{
if(iv_size == 0)
return true;
return false;
}
/*
* Return an ECB mode name
*/
std::string ECB::name() const
{
return (cipher->name() + "/" + mode_name + "/" + padder->name());
}
/*
* Encrypt in ECB mode
*/
void ECB_Encryption::write(const byte input[], u32bit length)
{
buffer.copy(position, input, length);
if(position + length >= BLOCK_SIZE)
{
cipher->encrypt(buffer);
send(buffer, BLOCK_SIZE);
input += (BLOCK_SIZE - position);
length -= (BLOCK_SIZE - position);
while(length >= BLOCK_SIZE)
{
cipher->encrypt(input, buffer);
send(buffer, BLOCK_SIZE);
input += BLOCK_SIZE;
length -= BLOCK_SIZE;
}
buffer.copy(input, length);
position = 0;
}
position += length;
}
/*
* Finish encrypting in ECB mode
*/
void ECB_Encryption::end_msg()
{
SecureVector<byte> padding(BLOCK_SIZE);
padder->pad(padding, padding.size(), position);
write(padding, padder->pad_bytes(BLOCK_SIZE, position));
if(position != 0)
throw Encoding_Error(name() + ": Did not pad to full blocksize");
}
/*
* Decrypt in ECB mode
*/
void ECB_Decryption::write(const byte input[], u32bit length)
{
buffer.copy(position, input, length);
if(position + length > BLOCK_SIZE)
{
cipher->decrypt(buffer);
send(buffer, BLOCK_SIZE);
input += (BLOCK_SIZE - position);
length -= (BLOCK_SIZE - position);
while(length > BLOCK_SIZE)
{
cipher->decrypt(input, buffer);
send(buffer, BLOCK_SIZE);
input += BLOCK_SIZE;
length -= BLOCK_SIZE;
}
buffer.copy(input, length);
position = 0;
}
position += length;
}
/*
* Finish decrypting in ECB mode
*/
void ECB_Decryption::end_msg()
{
if(position != BLOCK_SIZE)
throw Decoding_Error(name());
cipher->decrypt(buffer);
send(buffer, padder->unpad(buffer, BLOCK_SIZE));
state = buffer;
position = 0;
}
}
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