/*
* Blowfish-CBC buffer encryption/decryption
*/
int blowfish_crypt_cbc( blowfish_context *ctx,
int mode,
size_t length,
unsigned char iv[BLOWFISH_BLOCKSIZE],
const unsigned char *input,
unsigned char *output )
{
int i;
unsigned char temp[BLOWFISH_BLOCKSIZE];
if( length % BLOWFISH_BLOCKSIZE )
return( POLARSSL_ERR_BLOWFISH_INVALID_INPUT_LENGTH );
if( mode == BLOWFISH_DECRYPT )
{
while( length > 0 )
{
memcpy( temp, input, BLOWFISH_BLOCKSIZE );
blowfish_crypt_ecb( ctx, mode, input, output );
for( i = 0; i < BLOWFISH_BLOCKSIZE;i++ )
output[i] = (unsigned char)( output[i] ^ iv[i] );
memcpy( iv, temp, BLOWFISH_BLOCKSIZE );
input += BLOWFISH_BLOCKSIZE;
output += BLOWFISH_BLOCKSIZE;
length -= BLOWFISH_BLOCKSIZE;
}
}
else
{
while( length > 0 )
{
for( i = 0; i < BLOWFISH_BLOCKSIZE; i++ )
output[i] = (unsigned char)( input[i] ^ iv[i] );
blowfish_crypt_ecb( ctx, mode, output, output );
memcpy( iv, output, BLOWFISH_BLOCKSIZE );
input += BLOWFISH_BLOCKSIZE;
output += BLOWFISH_BLOCKSIZE;
length -= BLOWFISH_BLOCKSIZE;
}
}
return( 0 );
}
/*
* Blowfish CTR buffer encryption/decryption
*/
int blowfish_crypt_ctr( blowfish_context *ctx,
size_t length,
size_t *nc_off,
unsigned char nonce_counter[BLOWFISH_BLOCKSIZE],
unsigned char stream_block[BLOWFISH_BLOCKSIZE],
const unsigned char *input,
unsigned char *output )
{
int c, i;
size_t n = *nc_off;
while( length-- )
{
if( n == 0 ) {
blowfish_crypt_ecb( ctx, BLOWFISH_ENCRYPT, nonce_counter,
stream_block );
for( i = BLOWFISH_BLOCKSIZE; i > 0; i-- )
if( ++nonce_counter[i - 1] != 0 )
break;
}
c = *input++;
*output++ = (unsigned char)( c ^ stream_block[n] );
n = (n + 1) % BLOWFISH_BLOCKSIZE;
}
*nc_off = n;
return( 0 );
}
/*
* Blowfish CFB buffer encryption/decryption
*/
int blowfish_crypt_cfb64( blowfish_context *ctx,
int mode,
size_t length,
size_t *iv_off,
unsigned char iv[BLOWFISH_BLOCKSIZE],
const unsigned char *input,
unsigned char *output )
{
int c;
size_t n = *iv_off;
if( mode == BLOWFISH_DECRYPT )
{
while( length-- )
{
if( n == 0 )
blowfish_crypt_ecb( ctx, BLOWFISH_ENCRYPT, iv, iv );
c = *input++;
*output++ = (unsigned char)( c ^ iv[n] );
iv[n] = (unsigned char) c;
n = (n + 1) % BLOWFISH_BLOCKSIZE;
}
}
else
{
while( length-- )
{
if( n == 0 )
blowfish_crypt_ecb( ctx, BLOWFISH_ENCRYPT, iv, iv );
iv[n] = *output++ = (unsigned char)( iv[n] ^ *input++ );
n = (n + 1) % BLOWFISH_BLOCKSIZE;
}
}
*iv_off = n;
return( 0 );
}
static int blowfish_crypt_ecb_wrap( void *ctx, operation_t operation,
const unsigned char *input, unsigned char *output )
{
return blowfish_crypt_ecb( (blowfish_context *) ctx, operation, input,
output );
}
