Function mbedtls_oid_get_sig_alg 

pub unsafe extern "C" fn mbedtls_oid_get_sig_alg(
    oid: *const mbedtls_asn1_buf,
    md_alg: *mut mbedtls_md_type_t,
    pk_alg: *mut mbedtls_pk_type_t,
) -> c_int

\brief Translate SignatureAlgorithm OID into md_type and pk_type

\param oid OID to use \param md_alg place to store message digest algorithm \param pk_alg place to store public key algorithm

\return 0 if successful, or MBEDTLS_ERR_OID_NOT_FOUND