byte[] opad = new byte[64];

        // HMACT64 specific: truncate key to 64 bytes if needed
        int keyLen = Math.min(key.length, 64);
        for (int i = 0; i < keyLen; i++) {
            ipad[i] = (byte) (key[i] ^ 0x36);
            opad[i] = (byte) (key[i] ^ 0x5c);
        }
        for (int i = keyLen; i < 64; i++) {
            ipad[i] = 0x36;
            opad[i] = 0x5c;
        }

        byte[] opad = new byte[64];

        // HMACT64 specific: truncate key to 64 bytes if needed
        int keyLen = Math.min(key.length, 64);
        for (int i = 0; i < keyLen; i++) {
            ipad[i] = (byte) (key[i] ^ 0x36);
            opad[i] = (byte) (key[i] ^ 0x5c);
        }
        for (int i = keyLen; i < 64; i++) {
            ipad[i] = 0x36;
            opad[i] = 0x5c;
        }

            final int reqLen = negotiateWrite(smb2neg, first != null);
            final boolean doPreauth = getContext().getConfig().getMaximumVersion().atLeast(DialectVersion.SMB311);
            if (doPreauth) {
                negoReqBuffer = new byte[reqLen];
                System.arraycopy(this.sbuf, 4, negoReqBuffer, 0, reqLen);
            }

            negotiatePeek();