MeshCentral/rdp-nla-test.js

const crypto = require('crypto');
const forge = require('node-forge');
const asn1 = forge.asn1;
const pki = forge.pki;

const NegotiateFlags = {
    NtlmsspNegociate56: 0x80000000,
    NtlmsspNegociateKeyExch: 0x40000000,
    NtlmsspNegociate128: 0x20000000,
    NtlmsspNegociateVersion: 0x02000000,
    NtlmsspNegociateTargetInfo: 0x00800000,
    NtlmsspRequestNonNTSessionKey: 0x00400000,
    NtlmsspNegociateIdentify: 0x00100000,
    NtlmsspNegociateExtendedSessionSecurity: 0x00080000,
    NtlmsspTargetTypeServer: 0x00020000,
    NtlmsspTargetTypeDomain: 0x00010000,
    NtlmsspNegociateAlwaysSign: 0x00008000,
    NtlmsspNegociateOEMWorkstationSupplied: 0x00002000,
    NtlmsspNegociateOEMDomainSupplied: 0x00001000,
    NtlmsspNegociateNTLM: 0x00000200,
    NtlmsspNegociateLMKey: 0x00000080,
    NtlmsspNegociateDatagram: 0x00000040,
    NtlmsspNegociateSeal: 0x00000020,
    NtlmsspNegociateSign: 0x00000010,
    NtlmsspRequestTarget: 0x00000004,
    NtlmNegotiateOEM: 0x00000002,
    NtlmsspNegociateUnicode: 0x00000001
}

const MajorVersion = {
    WindowsMajorVersion5: 0x05,
    WindowsMajorVersion6: 0x06
}

const MinorVersion = {
    WindowsMinorVersion0: 0x00,
    WindowsMinorVersion1: 0x01,
    WindowsMinorVersion2: 0x02,
    WindowsMinorVersion3: 0x03
}

const NTLMRevision = {
    NtlmSspRevisionW2K3: 0x0F
}

function decodeTargetInfo(targetInfoBuf) {
    var r = {}, type, len, data, ptr = 0;
    while (true) {
        type = targetInfoBuf.readInt16LE(ptr);
        if (type == 0) break;
        len = targetInfoBuf.readInt16LE(ptr + 2);
        r[type] = targetInfoBuf.slice(ptr + 4, ptr + 4 + len);
        ptr += (4 + len);
    }
    return r;
}

function bufToArr(b) { var r = []; for (var i = 0; i < b.length; i++) { r.push(b.readUInt8(i)); } return r; } // For unit testing
function compareArray(a, b) { if (a.length != b.length) return false; for (var i = 0; i < a.length; i++) { if (a[i] != b[i]) return false; } return true; } // For unit testing
function toUnicode(str) { return Buffer.from(str, 'ucs2'); }
function md4(str) { return crypto.createHash('md4').update(str).digest(); }
function md5(str) { return crypto.createHash('md5').update(str).digest(); }
function hmac_md5(key, data) { return crypto.createHmac('md5', key).update(data).digest(); }
function ntowfv2(password, user, domain) { return hmac_md5(md4(toUnicode(password)), toUnicode(user.toUpperCase() + domain)); }
function lmowfv2(password, user, domain) { return ntowfv2(password, user, domain); }
function zeroBuffer(len) { return Buffer.alloc(len); }
function compute_response_v2(response_key_nt, response_key_lm, server_challenge, client_challenge, time, server_name) {
    const response_version = Buffer.from('01', 'hex');
    const hi_response_version = Buffer.from('01', 'hex');
    const temp = Buffer.concat([response_version, hi_response_version, zeroBuffer(6), time, client_challenge, zeroBuffer(4), server_name]);
    const nt_proof_str = hmac_md5(response_key_nt, Buffer.concat([server_challenge, temp]));
    const nt_challenge_response = Buffer.concat([nt_proof_str, temp]);
    const lm_challenge_response = Buffer.concat([hmac_md5(response_key_lm, Buffer.concat([server_challenge, client_challenge])), client_challenge]);
    const session_base_key = hmac_md5(response_key_nt, nt_proof_str);
    return [nt_challenge_response, lm_challenge_response, session_base_key];
}
function kx_key_v2(session_base_key, _lm_challenge_response, _server_challenge) { return session_base_key; }
function rc4k(key, data) { return crypto.createCipheriv('rc4', key, null).update(data); }

function create_negotiate_message() {
    return negotiate_message(
        NegotiateFlags.NtlmsspNegociateKeyExch |
        NegotiateFlags.NtlmsspNegociate128 |
        NegotiateFlags.NtlmsspNegociateExtendedSessionSecurity |
        NegotiateFlags.NtlmsspNegociateAlwaysSign |
        NegotiateFlags.NtlmsspNegociateNTLM |
        NegotiateFlags.NtlmsspNegociateSeal |
        NegotiateFlags.NtlmsspNegociateSign |
        NegotiateFlags.NtlmsspRequestTarget |
        NegotiateFlags.NtlmsspNegociateUnicode, Buffer.alloc(0), Buffer.alloc(0)
    );
}

function negotiate_message(flags, domain, workstation) {
    const offset = ((flags & NegotiateFlags.NtlmsspNegociateVersion) == 0) ? 32 : 40;
    const buf = Buffer.alloc(offset);
    buf.write('4e544c4d53535000', 0, 8, 'hex'); // Signature (NTLMSP\0)
    buf.writeInt32LE(1, 8); // MessageType (1)
    buf.writeInt32LE(flags, 12); // Flags
    buf.writeInt16LE(domain.length, 16); // DomainNameLen
    buf.writeInt16LE(domain.length, 18); // DomainNameMaxLen
    if (domain.length > 0) { buf.writeInt32LE(offset, 20); } // DomainNameBufferOffset
    buf.writeInt16LE(workstation.length, 24); // WorkstationLen
    buf.writeInt16LE(workstation.length, 26); // WorkstationMaxLen
    if (workstation.length > 0) { buf.writeInt32LE(offset + domain.length, 28); } // WorkstationBufferOffset
    if ((flags & NegotiateFlags.NtlmsspNegociateVersion) != 0) {
        buf.writeUInt8(MajorVersion.WindowsMajorVersion6, 32); // ProductMajorVersion
        buf.writeUInt8(MinorVersion.WindowsMinorVersion0, 33); // ProductMinorVersion
        buf.writeInt16LE(6002, 34); // ProductBuild
        //buf.writeInt16LE(0, 36); // Reserved
        //buf.writeUInt8(0, 38); // Reserved
        buf.writeUInt8(NTLMRevision.NtlmSspRevisionW2K3, 39); // NTLMRevisionCurrent
    }
    return Buffer.concat([buf, domain, workstation]);
}

function mac(rc4_handle, signing_key, seq_num, data) {
    const buf = Buffer.alloc(4);
    buf.writeInt32LE(seq_num, 0);
    var signature = hmac_md5(signing_key, Buffer.concat([buf, data]));
    return message_signature_ex(rc4_handle.update(signature.slice(0, 8)), seq_num);
}

function message_signature_ex(check_sum, seq_num) {
    const buf = Buffer.alloc(16);
    buf.writeInt32LE(1, 0); // Version
    if (check_sum) { check_sum.copy(buf, 4, 0, 8); } // check_sum
    if (seq_num) { buf.writeInt32LE(seq_num, 12); } // seq_num
    return buf;
}

/// Compute a signature of all data exchange during NTLMv2 handshake
function mic(exported_session_key, negotiate_message, challenge_message, authenticate_message) { return hmac_md5(exported_session_key, Buffer.concat([negotiate_message, challenge_message, authenticate_message])); }

/// NTLMv2 security interface generate a sign key
/// By using MD5 of the session key + a static member (sentense)
function sign_key(exported_session_key, is_client) {
    if (is_client) {
        return md5(Buffer.concat([exported_session_key, Buffer.from("session key to client-to-server signing key magic constant\0")]));
    } else {
        return md5(Buffer.concat([exported_session_key, Buffer.from("session key to server-to-client signing key magic constant\0")]));
    }
}

/// NTLMv2 security interface generate a seal key
/// By using MD5 of the session key + a static member (sentense)
function seal_key(exported_session_key, is_client) {
    if (is_client) {
        return md5(Buffer.concat([exported_session_key, Buffer.from("session key to client-to-server sealing key magic constant\0")]));
    } else {
        return md5(Buffer.concat([exported_session_key, Buffer.from("session key to server-to-client sealing key magic constant\0")]));
    }
}

/// We are now able to build a security interface
/// that will be used by the CSSP manager to cipherring message (private keys)
/// To detect MITM attack
function build_security_interface(ntlm) {
    const obj = {};
    if (ntlm) {
        obj.signing_key = sign_key(ntlm.exported_session_key, true);
        obj.verify_key = sign_key(ntlm.exported_session_key, false);
        const client_sealing_key = seal_key(ntlm.exported_session_key, true);
        const server_sealing_key = seal_key(ntlm.exported_session_key, false);
        obj.encrypt = crypto.createCipheriv('rc4', client_sealing_key, null);
        obj.decrypt = crypto.createCipheriv('rc4', server_sealing_key, null);
    }
    obj.seq_num = 0;

    obj.gss_wrapex = function (data) {
        const encrypted_data = obj.encrypt.update(data);
        const signature = mac(obj.encrypt, obj.signing_key, obj.seq_num, data);
        obj.seq_num++;
        return Buffer.concat([ signature, encrypted_data ] );
    }

    obj.gss_unwrapex = function(data) {
        const version = data.readInt32LE(0);
        const checksum = data.slice(4, 12);
        const seqnum = data.readInt32LE(12);
        const payload = data.slice(16);
        const plaintext_payload = obj.decrypt.update(payload);
        const plaintext_checksum = obj.decrypt.update(checksum);
        const seqnumbuf = Buffer.alloc(4);
        seqnumbuf.writeInt32LE(seqnum, 0);
        const computed_checksum = hmac_md5(obj.verify_key, Buffer.concat([ seqnumbuf, plaintext_payload ])).slice(0, 8);
        if (!plaintext_checksum.equals(computed_checksum)) { console.log("Invalid checksum on NTLMv2"); }
        return plaintext_payload.toString();
    }

    return obj;
}

function Create_Ntlm() {
    return {
        /// Microsoft Domain for Active Directory
        domain: "", //String,
        /// Username
        user: "", //String,
        /// Password
        password: "", // String,
        /// Key generated from NTLM hash
        response_key_nt: null, // Buffer
        /// Key generated from NTLM hash
        response_key_lm: null, // Buffer
        /// Keep trace of each messages to compute a final hash
        negotiate_message: null, // Buffer
        /// Key use to ciphering messages
        exported_session_key: crypto.randomBytes(16), // Buffer
        /// True if session use unicode
        is_unicode: false // Boolean
    }
}

function authenticate_message(lm_challenge_response, nt_challenge_response, domain, user, workstation, encrypted_random_session_key, flags) {
    const payload = Buffer.concat([lm_challenge_response, nt_challenge_response, domain, user, workstation, encrypted_random_session_key]);
    const offset = ((flags & NegotiateFlags.NtlmsspNegociateVersion) == 0) ? 80 : 88;
    const buf = Buffer.alloc(offset - 16);
    buf.write('4e544c4d53535000', 0, 8, 'hex'); // Signature
    buf.writeInt32LE(3, 8); // MessageType
    buf.writeInt16LE(lm_challenge_response.length, 12); // LmChallengeResponseLen
    buf.writeInt16LE(lm_challenge_response.length, 14); // LmChallengeResponseMaxLen
    if (lm_challenge_response.length > 0) { buf.writeInt32LE(offset, 16); } // LmChallengeResponseBufferOffset
    buf.writeInt16LE(nt_challenge_response.length, 20); // NtChallengeResponseLen
    buf.writeInt16LE(nt_challenge_response.length, 22); // NtChallengeResponseMaxLen
    if (nt_challenge_response.length > 0) { buf.writeInt32LE(offset + lm_challenge_response.length, 24); } // NtChallengeResponseBufferOffset
    buf.writeInt16LE(domain.length, 28); // DomainNameLen
    buf.writeInt16LE(domain.length, 30); // DomainNameMaxLen
    if (domain.length > 0) { buf.writeInt32LE(offset + lm_challenge_response.length + nt_challenge_response.length, 32); } // DomainNameBufferOffset
    buf.writeInt16LE(user.length, 36); // UserNameLen
    buf.writeInt16LE(user.length, 38); // UserNameMaxLen
    if (user.length > 0) { buf.writeInt32LE(offset + lm_challenge_response.length + nt_challenge_response.length + domain.length, 40); } // UserNameBufferOffset
    buf.writeInt16LE(workstation.length, 44); // WorkstationLen
    buf.writeInt16LE(workstation.length, 46); // WorkstationMaxLen
    if (workstation.length > 0) { buf.writeInt32LE(offset + lm_challenge_response.length + nt_challenge_response.length + domain.length + user.length, 48); } // WorkstationBufferOffset
    buf.writeInt16LE(encrypted_random_session_key.length, 52); // EncryptedRandomSessionLen
    buf.writeInt16LE(encrypted_random_session_key.length, 54); // EncryptedRandomSessionMaxLen
    buf.writeInt32LE(offset + lm_challenge_response.length + nt_challenge_response.length + domain.length + user.length + workstation.length, 56); // EncryptedRandomSessionBufferOffset
    buf.writeInt32LE(flags, 60); // NegotiateFlags
    if ((flags & NegotiateFlags.NtlmsspNegociateVersion) != 0) {
        buf.writeUInt8(MajorVersion.WindowsMajorVersion6, 64); // ProductMajorVersion
        buf.writeUInt8(MinorVersion.WindowsMinorVersion0, 65); // ProductMinorVersion
        buf.writeInt16LE(6002, 66); // ProductBuild
        //buf.writeInt16LE(0, 68); // Reserved
        //buf.writeUInt8(0, 70); // Reserved
        buf.writeUInt8(NTLMRevision.NtlmSspRevisionW2K3, 71); // NTLMRevisionCurrent
    }
    return [buf, payload];
}

function read_challenge_message(ntlm, derBuffer) {
    const headerSignature = derBuffer.slice(0, 8);
    if (headerSignature.toString('hex') != '4e544c4d53535000') { console.log('BAD SIGNATURE'); }
    const messageType = derBuffer.readInt32LE(8);
    if (messageType != 2) { console.log('BAD MESSAGE TYPE'); }
    const targetNameLen = derBuffer.readInt16LE(12);
    const targetNameLenMax = derBuffer.readInt16LE(14);
    const targetNameBufferOffset = derBuffer.readInt32LE(16);
    const negotiateFlags = derBuffer.readInt32LE(20);
    const serverChallenge = derBuffer.slice(24, 32);
    const reserved = derBuffer.slice(32, 40);
    if (reserved.toString('hex') != '0000000000000000') { console.log('BAD RESERVED'); }
    const targetInfoLen = derBuffer.readInt16LE(40);
    const targetInfoLenMax = derBuffer.readInt16LE(42);
    const targetInfoBufferOffset = derBuffer.readInt32LE(44);
    const targetName = derBuffer.slice(targetNameBufferOffset, targetNameBufferOffset + targetNameLen);
    const targetInfo = decodeTargetInfo(derBuffer.slice(targetInfoBufferOffset, targetInfoBufferOffset + targetInfoLen));
    const timestamp = targetInfo[7];
    if (timestamp == null) { console.log('NO TIMESTAMP'); }
    const clientChallenge = crypto.randomBytes(8);
    const response_key_nt = ntowfv2(ntlm.password, ntlm.user, ntlm.domain); // Password, Username, Domain
    const response_key_lm = lmowfv2(ntlm.password, ntlm.user, ntlm.domain); // Password, Username, Domain

    var resp = compute_response_v2(response_key_nt, response_key_lm, serverChallenge, clientChallenge, timestamp, targetName);
    const nt_challenge_response = resp[0];
    const lm_challenge_response = resp[1];
    const session_base_key = resp[2];

    const key_exchange_key = kx_key_v2(session_base_key, lm_challenge_response, serverChallenge);
    const encrypted_random_session_key = rc4k(key_exchange_key, ntlm.exported_session_key);

    ntlm.is_unicode = ((negotiateFlags & 1) != 0)
    var xdomain = null;
    var xuser = null;
    if (ntlm.is_unicode) {
        xdomain = toUnicode(ntlm.domain);
        xuser = toUnicode(ntlm.user);
    } else {
        xdomain = Buffer.from(ntlm.domain, 'utf8');
        xuser = Buffer.from(ntlm.user, 'utf8');
    }

    const auth_message_compute = authenticate_message(lm_challenge_response, nt_challenge_response, xdomain, xuser, zeroBuffer(0), encrypted_random_session_key, negotiateFlags);

    // Write a tmp message to compute MIC and then include it into final message
    const tmp_final_auth_message = Buffer.concat([auth_message_compute[0], zeroBuffer(16), auth_message_compute[1]]);

    const signature = mic(ntlm.exported_session_key, ntlm.negotiate_message, derBuffer, tmp_final_auth_message);
    return Buffer.concat([auth_message_compute[0], signature, auth_message_compute[1]]);
}


/*
// Create create_ts_request

const entireBuffer = Buffer.from('3081b2a003020106a181aa3081a73081a4a081a104819e4e544c4d53535000020000000e000e003800000035828a62f2290572b3cac375000000000000000058005800460000000a00614a0000000f430045004e005400520041004c0002000e00430045004e005400520041004c0001000e00430045004e005400520041004c0004000e00430065006e007400720061006c0003000e00430065006e007400720061006c0007000800afbc2c2a9256d80100000000', 'hex').toString('binary');

const ntml = Create_Ntlm();
ntml.domain = "";
ntml.user = "default";
ntml.password = "";
ntml.negotiate_message = Buffer.from('4e544c4d53535000010000003582086000000000000000000000000000000000', 'hex');

// We have a full ASN1 data block, decode it now
const der = asn1.fromDer(entireBuffer.toString('binary'));
const derNum = der.value[0].value[0].value.charCodeAt(0);
const derBuffer = Buffer.from(der.value[1].value[0].value[0].value[0].value[0].value, 'binary');
const client_challenge = read_challenge_message(ntml, derBuffer);

console.log('client_challenge', client_challenge.toString('hex'));

const NTLMv2SecurityInterface = build_security_interface(ntml);
*/


function unitTest() {
    console.log('--- Starting RDP NLA Unit Tests');

    // Test format of the first client message
    var r = create_negotiate_message();
    console.log(compareArray(bufToArr(r), [78, 84, 76, 77, 83, 83, 80, 0, 1, 0, 0, 0, 53, 130, 8, 96, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]) ? "negotiate_message passed." : "negotiate_message failed.");

    // Test of MD4 hash function
    r = md4(Buffer.from("foo"));
    console.log(compareArray(bufToArr(r), [0x0a, 0xc6, 0x70, 0x0c, 0x49, 0x1d, 0x70, 0xfb, 0x86, 0x50, 0x94, 0x0b, 0x1c, 0xa1, 0xe4, 0xb2]) ? "RC4 passed." : "RC4 failed.");

    // Test of the unicode function
    r = toUnicode("foo");
    console.log(compareArray(bufToArr(r), [0x66, 0x00, 0x6f, 0x00, 0x6f, 0x00]) ? "Unicode passed." : "Unicode failed.");

    // Test HMAC_MD5 function
    r = hmac_md5(Buffer.from("foo"), Buffer.from("bar"));
    console.log(compareArray(bufToArr(r), [0x0c, 0x7a, 0x25, 0x02, 0x81, 0x31, 0x5a, 0xb8, 0x63, 0x54, 0x9f, 0x66, 0xcd, 0x8a, 0x3a, 0x53]) ? "HMAC_MD5 passed." : "HMAC_MD5 failed.");

    // Test NTOWFv2 function
    r = ntowfv2("foo", "user", "domain");
    console.log(compareArray(bufToArr(r), [0x6e, 0x53, 0xb9, 0x0, 0x97, 0x8c, 0x87, 0x1f, 0x91, 0xde, 0x6, 0x44, 0x9d, 0x8b, 0x8b, 0x81]) ? "NTOWFv2 passed." : "NTOWFv2 failed.");

    // Test LMOWFv2 function
    r = ntowfv2("foo", "user", "domain");
    console.log(compareArray(bufToArr(r), ntowfv2("foo", "user", "domain")) ? "LMOWFv2 passed." : "LMOWFv2 failed.");

    // Test compute response v2 function
    r = compute_response_v2(Buffer.from("a"), Buffer.from("b"), Buffer.from("c"), Buffer.from("d"), Buffer.from("e"), Buffer.from("f"));
    console.log(compareArray(bufToArr(r[0]), [0xb4, 0x23, 0x84, 0xf, 0x6e, 0x83, 0xc1, 0x5a, 0x45, 0x4f, 0x4c, 0x92, 0x7a, 0xf2, 0xc3, 0x3e, 0x1, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x65, 0x64, 0x0, 0x0, 0x0, 0x0, 0x66]) ? "responsev2 1 passed." : "responsev2 1 failed.");
    console.log(compareArray(bufToArr(r[1]), [0x56, 0xba, 0xff, 0x2d, 0x98, 0xbe, 0xcd, 0xa5, 0x6d, 0xe6, 0x17, 0x89, 0xe1, 0xed, 0xca, 0xae, 0x64]) ? "responsev2 2 passed." : "responsev2 2 failed.");
    console.log(compareArray(bufToArr(r[2]), [0x40, 0x3b, 0x33, 0xe5, 0x24, 0x34, 0x3c, 0xc3, 0x24, 0xa0, 0x4d, 0x77, 0x75, 0x34, 0xa4, 0xd0]) ? "responsev2 3 passed." : "responsev2 3 failed.");

    // Test of rc4k function
    r = rc4k(Buffer.from("foo"), Buffer.from("bar"));
    console.log(compareArray(bufToArr(r), [201, 67, 159]) ? "rc4k passed." : "rc4k failed.");

    // Test of sign_key function
    r = sign_key(Buffer.from("foo"), true);
    console.log(compareArray(bufToArr(r), [253, 238, 149, 155, 221, 78, 43, 179, 82, 61, 111, 132, 168, 68, 222, 15]) ? "sign_key 1 passed." : "sign_key 1 failed.");
    r = sign_key(Buffer.from("foo"), false);
    console.log(compareArray(bufToArr(r), [90, 201, 12, 225, 140, 156, 151, 61, 156, 56, 31, 254, 10, 223, 252, 74]) ? "sign_key 2 passed." : "sign_key 2 failed.");

    // Test of seal_key function
    r = seal_key(Buffer.from("foo"), true);
    console.log(compareArray(bufToArr(r), [20, 213, 185, 176, 168, 142, 134, 244, 36, 249, 89, 247, 180, 36, 162, 101]) ? "seal_key 1 passed." : "seal_key 1 failed.");
    r = seal_key(Buffer.from("foo"), false);
    console.log(compareArray(bufToArr(r), [64, 125, 160, 17, 144, 165, 62, 226, 22, 125, 128, 31, 103, 141, 55, 40]) ? "seal_key 2 passed." : "seal_key 2 failed.");

    // Test signature function
    var rc4 = crypto.createCipheriv('rc4', Buffer.from("foo"), null);
    r = mac(rc4, Buffer.from("bar"), 0, Buffer.from("data"));
    console.log(compareArray(bufToArr(r), [1, 0, 0, 0, 77, 211, 144, 84, 51, 242, 202, 176, 0, 0, 0, 0]) ? "Signature passed." : "Signature failed.");

    // Test challenge message
    r = authenticate_message(Buffer.from("foo"), Buffer.from("foo"), Buffer.from("domain"), Buffer.from("user"), Buffer.from("workstation"), Buffer.from("foo"), 0);
    var buf = Buffer.concat([r[0], Buffer.alloc(16), r[1]]);
    console.log(compareArray(bufToArr(buf), [78, 84, 76, 77, 83, 83, 80, 0, 3, 0, 0, 0, 3, 0, 3, 0, 80, 0, 0, 0, 3, 0, 3, 0, 83, 0, 0, 0, 6, 0, 6, 0, 86, 0, 0, 0, 4, 0, 4, 0, 92, 0, 0, 0, 11, 0, 11, 0, 96, 0, 0, 0, 3, 0, 3, 0, 107, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 102, 111, 111, 102, 111, 111, 100, 111, 109, 97, 105, 110, 117, 115, 101, 114, 119, 111, 114, 107, 115, 116, 97, 116, 105, 111, 110, 102, 111, 111]) ? "Challenge message passed." : "Challenge message failed.");

    // Test RC4
    rc4 = crypto.createCipheriv('rc4', Buffer.from("foo"), null);
    r = rc4.update(Buffer.from("bar"));
    console.log(compareArray(bufToArr(r), [201, 67, 159]) ? "RC4 1 passed." : "RC4 1 failed.");
    r = rc4.update(Buffer.from("bar"));
    console.log(compareArray(bufToArr(r), [75, 169, 19]) ? "RC4 2 passed." : "RC4  failed.");

    console.log('--- RDP NLA Unit Tests Completed');
}

unitTest();