int nameLen = nameBytes.length;

        byte[] buf = new byte[2 + 2 + oidLen + 4 + nameLen];
        int i = 0;
        // TOK_ID
        buf[i++] = tokId[0];
        buf[i++] = tokId[1];
        // MECH_OID_LEN (2 bytes big-endian)
        buf[i++] = (byte) ((oidLen >>> 8) & 0xFF);
        buf[i++] = (byte) (oidLen & 0xFF);
        // MECH_OID
        System.arraycopy(oidDer, 0, buf, i, oidLen);
        i += oidLen;

        }
        // 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++;
        len |= 0xff & buf[i++];

        // MECH_OID
        if (buf.length < i + len) {
            throw new IllegalArgumentException();
        }