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- Fixed a potential loop bug

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This commit is contained in:
Paul Bakker 2011-11-29 15:56:12 +00:00
parent 02faf45d8b
commit 23fd5ea667
1 changed files with 5 additions and 3 deletions
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8
library/ctr_drbg.c
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@ -253,6 +253,7 @@ int ctr_drbg_random_with_add( void *p_rng,
unsigned char *p = output; unsigned char *p = output;
unsigned char tmp[CTR_DRBG_BLOCKSIZE]; unsigned char tmp[CTR_DRBG_BLOCKSIZE];
int cb, i; int cb, i;
size_t use_len;
if( output_len > CTR_DRBG_MAX_REQUEST ) if( output_len > CTR_DRBG_MAX_REQUEST )
return( POLARSSL_ERR_CTR_DRBG_REQUEST_TOO_BIG ); return( POLARSSL_ERR_CTR_DRBG_REQUEST_TOO_BIG );
@ -293,12 +294,13 @@ int ctr_drbg_random_with_add( void *p_rng,
*/ */
aes_crypt_ecb( &ctx->aes_ctx, AES_ENCRYPT, ctx->counter, tmp ); aes_crypt_ecb( &ctx->aes_ctx, AES_ENCRYPT, ctx->counter, tmp );
use_len = (output_len > CTR_DRBG_BLOCKSIZE ) ? CTR_DRBG_BLOCKSIZE : output_len;
/* /*
* Copy random block to destination * Copy random block to destination
*/ */
memcpy( p, tmp, (output_len > CTR_DRBG_BLOCKSIZE ) ? CTR_DRBG_BLOCKSIZE : output_len ); memcpy( p, tmp, use_len );
p += CTR_DRBG_BLOCKSIZE; p += use_len;
output_len -= CTR_DRBG_BLOCKSIZE; output_len -= use_len;
} }
ctr_drbg_update( ctx, add_input ); ctr_drbg_update( ctx, add_input );