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ECDSA: Add mbedtls_ecdsa_can_do

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This commit is contained in:
Christoph M. Wintersteiger 2019-01-07 13:47:30 +00:00 • committed by Janos Follath
parent 8a0f5bb3c1
commit 0082f9df6f
3 changed files with 32 additions and 5 deletions
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20
library/ecdsa.c Normal file → Executable file
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@ -263,9 +263,7 @@ static int ecdsa_sign_restartable( mbedtls_ecp_group *grp,
mbedtls_mpi *pk = &k, *pr = r;
/* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */
if( grp->id == MBEDTLS_ECP_DP_CURVE25519 ||
grp->id == MBEDTLS_ECP_DP_CURVE448 ||
grp->N.p == NULL )
if( !mbedtls_ecdsa_can_do( grp->id ) || grp->N.p == NULL )
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
/* Make sure d is in range 1..n-1 */
@ -380,6 +378,20 @@ cleanup:
return( ret );
}
int mbedtls_ecdsa_can_do( mbedtls_ecp_group_id gid )
{
switch( gid )
{
#ifdef MBEDTLS_ECP_DP_CURVE25519_ENABLED
case MBEDTLS_ECP_DP_CURVE25519: return 0;
#endif
#ifdef MBEDTLS_ECP_DP_CURVE448_ENABLED
case MBEDTLS_ECP_DP_CURVE448: return 0;
#endif
default: return 1;
}
}
/*
* Compute ECDSA signature of a hashed message
*/
@ -504,7 +516,7 @@ static int ecdsa_verify_restartable( mbedtls_ecp_group *grp,
mbedtls_mpi_init( &u1 ); mbedtls_mpi_init( &u2 );
/* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */
if( grp->N.p == NULL )
if( !mbedtls_ecdsa_can_do( grp->id ) || grp->N.p == NULL )
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
ECDSA_RS_ENTER( ver );