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Remove unnecessary flag from CMAC context

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This commit is contained in:
Janos Follath 2016-10-11 10:49:26 +01:00 committed by Simon Butcher
parent 851ae29a5d
commit e3d882ad4a
2 changed files with 1 additions and 15 deletions
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4
include/mbedtls/cmac.h
View File

@ -44,7 +44,6 @@ extern "C" {
*/ */
struct mbedtls_cmac_context_t struct mbedtls_cmac_context_t
{ {
/** Internal state of the CMAC algorithm */ /** Internal state of the CMAC algorithm */
unsigned char state[MBEDTLS_CIPHER_BLKSIZE_MAX]; unsigned char state[MBEDTLS_CIPHER_BLKSIZE_MAX];
@ -54,9 +53,6 @@ struct mbedtls_cmac_context_t
/** Length of data pending to be processed */ /** Length of data pending to be processed */
size_t unprocessed_len; size_t unprocessed_len;
/** Flag to indicate if the last block needs padding */
int padding_flag;
}; };
/** /**

12
library/cmac.c
View File

@ -235,7 +235,6 @@ int mbedtls_cipher_cmac_starts( mbedtls_cipher_context_t *ctx,
ctx->cmac_ctx = cmac_ctx; ctx->cmac_ctx = cmac_ctx;
mbedtls_zeroize( cmac_ctx->state, sizeof( cmac_ctx->state ) ); mbedtls_zeroize( cmac_ctx->state, sizeof( cmac_ctx->state ) );
cmac_ctx->padding_flag = 1;
return 0; return 0;
} }
@ -292,8 +291,6 @@ int mbedtls_cipher_cmac_update( mbedtls_cipher_context_t *ctx,
ilen -= block_size; ilen -= block_size;
input += block_size; input += block_size;
cmac_ctx->padding_flag = 0;
} }
/* If there is data left over that wasn't aligned to a block */ /* If there is data left over that wasn't aligned to a block */
@ -303,11 +300,6 @@ int mbedtls_cipher_cmac_update( mbedtls_cipher_context_t *ctx,
input, input,
ilen ); ilen );
cmac_ctx->unprocessed_len += ilen; cmac_ctx->unprocessed_len += ilen;
if( ilen % block_size > 0 )
cmac_ctx->padding_flag = 1;
else
cmac_ctx->padding_flag = 0;
} }
exit: exit:
@ -340,7 +332,7 @@ int mbedtls_cipher_cmac_finish( mbedtls_cipher_context_t *ctx,
last_block = cmac_ctx->unprocessed_block; last_block = cmac_ctx->unprocessed_block;
/* Calculate last block */ /* Calculate last block */
if( cmac_ctx->padding_flag && cmac_ctx->unprocessed_len < block_size ) if( cmac_ctx->unprocessed_len < block_size )
{ {
cmac_pad( M_last, block_size, last_block, cmac_ctx->unprocessed_len ); cmac_pad( M_last, block_size, last_block, cmac_ctx->unprocessed_len );
cmac_xor_block( M_last, M_last, K2, block_size ); cmac_xor_block( M_last, M_last, K2, block_size );
@ -367,7 +359,6 @@ exit:
mbedtls_zeroize( K1, sizeof( K1 ) ); mbedtls_zeroize( K1, sizeof( K1 ) );
mbedtls_zeroize( K2, sizeof( K2 ) ); mbedtls_zeroize( K2, sizeof( K2 ) );
cmac_ctx->padding_flag = 1;
cmac_ctx->unprocessed_len = 0; cmac_ctx->unprocessed_len = 0;
mbedtls_zeroize( cmac_ctx->unprocessed_block, mbedtls_zeroize( cmac_ctx->unprocessed_block,
sizeof( cmac_ctx->unprocessed_block ) ); sizeof( cmac_ctx->unprocessed_block ) );
@ -391,7 +382,6 @@ int mbedtls_cipher_cmac_reset( mbedtls_cipher_context_t *ctx )
sizeof( cmac_ctx->unprocessed_block ) ); sizeof( cmac_ctx->unprocessed_block ) );
mbedtls_zeroize( cmac_ctx->state, mbedtls_zeroize( cmac_ctx->state,
sizeof( cmac_ctx->state ) ); sizeof( cmac_ctx->state ) );
cmac_ctx->padding_flag = 1;
return( 0 ); return( 0 );
} }