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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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11
include/mbedtls/ecdsa.h Normal file → Executable file
View file

@ -125,6 +125,16 @@ typedef void mbedtls_ecdsa_restart_ctx;
#endif /* MBEDTLS_ECP_RESTARTABLE */
/**
* \brief This function checks whether a given group can be used
* for ECDSA.
*
* \param gid The ECP group ID to check.
*
* \return \c 1 if the group can be used, \c 0 otherwise
*/
int mbedtls_ecdsa_can_do( mbedtls_ecp_group_id gid );
/**
* \brief This function computes the ECDSA signature of a
* previously-hashed message.
@ -469,7 +479,6 @@ int mbedtls_ecdsa_read_signature_restartable( mbedtls_ecdsa_context *ctx,
const unsigned char *hash, size_t hlen,
const unsigned char *sig, size_t slen,
mbedtls_ecdsa_restart_ctx *rs_ctx );
/**
* \brief This function generates an ECDSA keypair on the given curve.
*

20
library/ecdsa.c Normal file → Executable file
View file

@ -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 );

6
programs/test/benchmark.c
View file

@ -835,6 +835,9 @@ int main( int argc, char *argv[] )
curve_info->grp_id != MBEDTLS_ECP_DP_NONE;
curve_info++ )
{
if( mbedtls_ecdsa_can_do( curve_info->grp_id ) == 0 )
continue;
mbedtls_ecdsa_init( &ecdsa );
if( mbedtls_ecdsa_genkey( &ecdsa, curve_info->grp_id, myrand, NULL ) != 0 )
@ -854,6 +857,9 @@ int main( int argc, char *argv[] )
curve_info->grp_id != MBEDTLS_ECP_DP_NONE;
curve_info++ )
{
if( mbedtls_ecdsa_can_do( curve_info->grp_id ) == 0 )
continue;
mbedtls_ecdsa_init( &ecdsa );
if( mbedtls_ecdsa_genkey( &ecdsa, curve_info->grp_id, myrand, NULL ) != 0 ||