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Improve comment on local_output.

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Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
This commit is contained in:
Mateusz Starzyk 2021-08-09 16:05:14 +02:00
parent a42f9537b5
commit 2f1754916c
1 changed files with 4 additions and 1 deletions
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5
library/ccm.c
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@ -387,7 +387,10 @@ int mbedtls_ccm_update( mbedtls_ccm_context *ctx,
if( ctx->mode == MBEDTLS_CCM_DECRYPT || \ if( ctx->mode == MBEDTLS_CCM_DECRYPT || \
ctx->mode == MBEDTLS_CCM_STAR_DECRYPT ) ctx->mode == MBEDTLS_CCM_STAR_DECRYPT )
{ {
/* Write decrypted data to local_output to avoid using output variable as /* Since output may be in shared memory, we cannot be sure that
* it will contain what we wrote to it. Therefore, we should avoid using
* it as input to any operations.
* Write decrypted data to local_output to avoid using output variable as
* input in the XOR operation for Y. * input in the XOR operation for Y.
*/ */
ret = mbedtls_ccm_crypt( ctx, offset, use_len, input, local_output ); ret = mbedtls_ccm_crypt( ctx, offset, use_len, input, local_output );