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Clarify the use of MBEDTLS_ERR_PK_SIG_LEN_MISMATCH

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Clarify what MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH and
MBEDTLS_ERR_PK_SIG_LEN_MISMATCH mean. Add comments to highlight that
this indicates that a valid signature is present, unlike other error
codes. See
https://github.com/ARMmbed/mbedtls/pull/1149#discussion_r178130705
This commit is contained in:
Gilles Peskine
2018-03-30 07:12:15 +02:00
parent 32605dc830
commit 5114d3e4e1
5 changed files with 17 additions and 9 deletions
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3
library/ecdsa.c
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@ -400,6 +400,9 @@ int mbedtls_ecdsa_read_signature( mbedtls_ecdsa_context *ctx,
&ctx->Q, &r, &s ) ) != 0 )
goto cleanup;
/* At this point we know that the buffer starts with a valid signature.
* Return 0 if the buffer just contains the signature, and a specific
* error code if the valid signature is followed by more data. */
if( p != end )
ret = MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH;