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Add ecp_check_pub_priv()

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This commit is contained in:
Manuel Pégourié-Gonnard
2014-11-06 15:25:32 +01:00
parent 2f8d1f9fc3
commit 30668d688d
4 changed files with 107 additions and 0 deletions
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42
library/ecp.c
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@ -1897,6 +1897,48 @@ int ecp_gen_key( ecp_group_id grp_id, ecp_keypair *key,
return( ecp_gen_keypair( &key->grp, &key->d, &key->Q, f_rng, p_rng ) );
}
/*
* Check a public-private key pair
*/
int ecp_check_pub_priv( const ecp_keypair *pub, const ecp_keypair *prv )
{
int ret;
ecp_point Q;
ecp_group grp;
if( pub->grp.id == POLARSSL_ECP_DP_NONE ||
pub->grp.id != prv->grp.id ||
mpi_cmp_mpi( &pub->Q.X, &prv->Q.X ) ||
mpi_cmp_mpi( &pub->Q.Y, &prv->Q.Y ) ||
mpi_cmp_mpi( &pub->Q.Z, &prv->Q.Z ) )
{
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
}
ecp_point_init( &Q );
ecp_group_init( &grp );
/* ecp_mul() needs a non-const group... */
ecp_group_copy( &grp, &prv->grp );
/* Also checks d is valid */
MPI_CHK( ecp_mul( &grp, &Q, &prv->d, &prv->grp.G, NULL, NULL ) );
if( mpi_cmp_mpi( &Q.X, &prv->Q.X ) ||
mpi_cmp_mpi( &Q.Y, &prv->Q.Y ) ||
mpi_cmp_mpi( &Q.Z, &prv->Q.Z ) )
{
ret = POLARSSL_ERR_ECP_BAD_INPUT_DATA;
goto cleanup;
}
cleanup:
ecp_point_free( &Q );
ecp_group_free( &grp );
return( ret );
}
#if defined(POLARSSL_SELF_TEST)
/*