lib/mbedtls
1
0
Fork 0
mirror of https://github.com/Mbed-TLS/mbedtls.git synced 2025-08-01 10:06:53 +03:00
Code Activity

- Added additional (configurable) cipher block modes. AES-CTR, Camellia-CTR, XTEA-CBC

Browse Source
This commit is contained in:
Paul Bakker
2011-04-19 14:29:23 +00:00
parent 34953bbcd3
commit b6ecaf5276
10 changed files with 551 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
library/xtea.c
View File

@ -111,6 +111,58 @@ int xtea_crypt_ecb( xtea_context *ctx, int mode, unsigned char input[8],
return( 0 );
}
/*
* XTEA-CBC buffer encryption/decryption
*/
int xtea_crypt_cbc( xtea_context *ctx,
int mode,
int length,
unsigned char iv[8],
unsigned char *input,
unsigned char *output)
{
int i;
unsigned char temp[8];
if(length % 8)
return( POLARSSL_ERR_XTEA_INVALID_INPUT_LENGTH );
if( mode == XTEA_DECRYPT )
{
while( length > 0 )
{
memcpy( temp, input, 8 );
xtea_crypt_ecb( ctx, mode, input, output );
for(i = 0; i < 8; i++)
output[i] = (unsigned char)( output[i] ^ iv[i] );
memcpy( iv, temp, 8 );
input += 8;
output += 8;
length -= 8;
}
}
else
{
while( length > 0 )
{
for( i = 0; i < 8; i++ )
output[i] = (unsigned char)( input[i] ^ iv[i] );
xtea_crypt_ecb( ctx, mode, output, output );
memcpy( iv, output, 8 );
input += 8;
output += 8;
length -= 8;
}
}
return( 0 );
}
#if defined(POLARSSL_SELF_TEST)
#include <string.h>