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ccm.c: Return early when ccm* is used without tag.

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Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
This commit is contained in:
Minos Galanakis 2024-08-22 09:21:53 +01:00
parent 28cdd11908
commit 837af430ff
1 changed files with 2 additions and 1 deletions
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3
library/ccm.c
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@ -170,11 +170,12 @@ static int ccm_calculate_first_block_if_ready(mbedtls_ccm_context *ctx)
}
/* CCM expects non-empty tag.
* CCM* allows empty tag. For CCM* without tag, ignore plaintext length.
* CCM* allows empty tag. For CCM* without tag, the tag calculation is skipped.
*/
if (ctx->tag_len == 0) {
if (ctx->mode == MBEDTLS_CCM_STAR_ENCRYPT || ctx->mode == MBEDTLS_CCM_STAR_DECRYPT) {
ctx->plaintext_len = 0;
return 0;
} else {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}