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Add special return code for ecdsa length mismatch

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Manuel Pégourié-Gonnard 2014-04-08 12:17:41 +02:00 • committed by Paul Bakker
parent 1cfc45835f
commit 35e95ddca4
5 changed files with 14 additions and 6 deletions
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11
library/ecdsa.c
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@ -422,11 +422,14 @@ int ecdsa_read_signature( ecdsa_context *ctx,
( ret = asn1_get_mpi( &p, end, &ctx->s ) ) != 0 )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA + ret );
if( p != end )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
if( ( ret = ecdsa_verify( &ctx->grp, hash, hlen,
&ctx->Q, &ctx->r, &ctx->s ) ) != 0 )
return( ret );
return( ecdsa_verify( &ctx->grp, hash, hlen, &ctx->Q, &ctx->r, &ctx->s ) );
if( p != end )
return( POLARSSL_ERR_ECP_SIG_LEN_MISMATCH );
return( 0 );
}
/*

2
library/error.c
View file

@ -245,6 +245,8 @@ void polarssl_strerror( int ret, char *buf, size_t buflen )
snprintf( buf, buflen, "ECP - Generation of random value, such as (ephemeral) key, failed" );
if( use_ret == -(POLARSSL_ERR_ECP_INVALID_KEY) )
snprintf( buf, buflen, "ECP - Invalid private or public key" );
if( use_ret == -(POLARSSL_ERR_ECP_SIG_LEN_MISMATCH) )
snprintf( buf, buflen, "ECP - Signature is valid but shorter than the user-supplied length" );
#endif /* POLARSSL_ECP_C */
#if defined(POLARSSL_MD_C)