SECITEM_TO_MPINT
SECITEM_TO_MPINT( params->order, &order );
SECITEM_TO_MPINT( params->curve.a, &a );
SECITEM_TO_MPINT( params->curve.b, &b );
SECITEM_TO_MPINT( params->fieldID.u.prime, &irreducible );
SECITEM_TO_MPINT( params->fieldID.u.poly, &irreducible );
SECITEM_TO_MPINT( ecParams->order, &n );
SECITEM_TO_MPINT( key->privateValue, &d );
SECITEM_TO_MPINT(*digest, &s); /* s = HASH(M) */
SECITEM_TO_MPINT(ecParams->order, &n);
SECITEM_TO_MPINT(*digest, &u1); /* u1 = HASH(M) */