Function mbedtls_oid_get_sig_alg_desc 

pub unsafe extern "C" fn mbedtls_oid_get_sig_alg_desc(
    oid: *const mbedtls_asn1_buf,
    desc: *mut *const c_char,
) -> c_int

\brief Translate SignatureAlgorithm OID into description

\param oid OID to use \param desc place to store string pointer

\return 0 if successful, or MBEDTLS_ERR_OID_NOT_FOUND