int i;
        int len;
        if (buf.length < TOK_ID_SIZE + MECH_OID_LEN_SIZE) {
            throw new IllegalArgumentException();
        }
        // TOK_ID
        for (i = 0; i < TOK_ID.length; i++) {
            if (TOK_ID[i] != buf[i]) {
                throw new IllegalArgumentException();
            }
        }
        // MECH_OID_LEN
        len = 0xff00 & buf[i] << 8;
        i++;

        return Stream.of(
                // Too short for TOK_ID + MECH_OID_LEN
                Arguments.of("too short header", new byte[] { 0x04, 0x01, 0x00 }, IllegalArgumentException.class),

                // Wrong TOK_ID
                Arguments.of("wrong TOK_ID", new byte[] { 0x00, 0x02, 0x00, 0x01 }, IllegalArgumentException.class),