Postman WSSE Header Generation Pre-request Script (Tailored for Emarsys)

pre-request-script.js

/*
 * This script should be used as the pre-request script for any requests made to Emarsys. In theory, it should work for any API that implements WSSE authentication as well.
 * To Use:
 *    1: Set an environment variable for wsse-user and wsse-secret containing your WSSE user and secret respectively
 *    2: On your Headers tab, add an X-WSSE header with a value of {{wsse-header}}
 *
 * That's it! When you make a request, the pre-request script will generate your Nonce, Timestamp, and Digest using your secret. The 1-time-use header will be stored in the environment as wsse-header and used for your request.
 */
//
// wsse.js - Generate WSSE authentication header in JavaScript
// (C) 2005 Victor R. Ruiz <victor*sixapart.com> - http://rvr.typepad.com/
//
// Parts:
//   SHA-1 library (C) 2000-2002 Paul Johnston - BSD license
//   ISO 8601 function (C) 2000 JF Walker All Rights
//   Base64 function (C) aardwulf systems - Creative Commons
// 
// Example call:
//
//   var w = wsseHeader(Username, Password);
//   alert('X-WSSE: ' + w);
//
// Changelog:
//   2005.07.21 - Release 1.0
//

/*
 * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
 * in FIPS PUB 180-1
 * Version 2.1a Copyright Paul Johnston 2000 - 2002.
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for details.
 */

/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */
var hexcase = 0;  /* hex output format. 0 - lowercase; 1 - uppercase        */
var b64pad  = "="; /* base-64 pad character. "=" for strict RFC compliance   */
var chrsz   = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode      */

/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
function hex_sha1(s){return binb2hex(core_sha1(str2binb(s),s.length * chrsz));}
function b64_sha1(s){return binb2b64(core_sha1(str2binb(s),s.length * chrsz));}
function str_sha1(s){return binb2str(core_sha1(str2binb(s),s.length * chrsz));}
function hex_hmac_sha1(key, data){ return binb2hex(core_hmac_sha1(key, data));}
function b64_hmac_sha1(key, data){ return binb2b64(core_hmac_sha1(key, data));}
function str_hmac_sha1(key, data){ return binb2str(core_hmac_sha1(key, data));}

/*
 * Perform a simple self-test to see if the VM is working
 */
function sha1_vm_test()
{
  return hex_sha1("abc") == "a9993e364706816aba3e25717850c26c9cd0d89d";
}

/*
 * Calculate the SHA-1 of an array of big-endian words, and a bit length
 */
function core_sha1(x, len)
{
  /* append padding */
  x[len >> 5] |= 0x80 << (24 - len % 32);
  x[((len + 64 >> 9) << 4) + 15] = len;

  var w = Array(80);
  var a =  1732584193;
  var b = -271733879;
  var c = -1732584194;
  var d =  271733878;
  var e = -1009589776;

  for(var i = 0; i < x.length; i += 16)
  {
    var olda = a;
    var oldb = b;
    var oldc = c;
    var oldd = d;
    var olde = e;

    for(var j = 0; j < 80; j++)
    {
      if(j < 16) w[j] = x[i + j];
      else w[j] = rol(w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16], 1);
      var t = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)),
                       safe_add(safe_add(e, w[j]), sha1_kt(j)));
      e = d;
      d = c;
      c = rol(b, 30);
      b = a;
      a = t;
    }

    a = safe_add(a, olda);
    b = safe_add(b, oldb);
    c = safe_add(c, oldc);
    d = safe_add(d, oldd);
    e = safe_add(e, olde);
  }
  return Array(a, b, c, d, e);

}

/*
 * Perform the appropriate triplet combination function for the current
 * iteration
 */
function sha1_ft(t, b, c, d)
{
  if(t < 20) return (b & c) | ((~b) & d);
  if(t < 40) return b ^ c ^ d;
  if(t < 60) return (b & c) | (b & d) | (c & d);
  return b ^ c ^ d;
}

/*
 * Determine the appropriate additive constant for the current iteration
 */
function sha1_kt(t)
{
  return (t < 20) ?  1518500249 : (t < 40) ?  1859775393 :
         (t < 60) ? -1894007588 : -899497514;
}

/*
 * Calculate the HMAC-SHA1 of a key and some data
 */
function core_hmac_sha1(key, data)
{
  var bkey = str2binb(key);
  if(bkey.length > 16) bkey = core_sha1(bkey, key.length * chrsz);

  var ipad = Array(16), opad = Array(16);
  for(var i = 0; i < 16; i++)
  {
    ipad[i] = bkey[i] ^ 0x36363636;
    opad[i] = bkey[i] ^ 0x5C5C5C5C;
  }

  var hash = core_sha1(ipad.concat(str2binb(data)), 512 + data.length * chrsz);
  return core_sha1(opad.concat(hash), 512 + 160);
}

/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function safe_add(x, y)
{
  var lsw = (x & 0xFFFF) + (y & 0xFFFF);
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
  return (msw << 16) | (lsw & 0xFFFF);
}

/*
 * Bitwise rotate a 32-bit number to the left.
 */
function rol(num, cnt)
{
  return (num << cnt) | (num >>> (32 - cnt));
}

/*
 * Convert an 8-bit or 16-bit string to an array of big-endian words
 * In 8-bit function, characters >255 have their hi-byte silently ignored.
 */
function str2binb(str)
{
  var bin = Array();
  var mask = (1 << chrsz) - 1;
  for(var i = 0; i < str.length * chrsz; i += chrsz)
    bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (32 - chrsz - i%32);
  return bin;
}

/*
 * Convert an array of big-endian words to a string
 */
function binb2str(bin)
{
  var str = "";
  var mask = (1 << chrsz) - 1;
  for(var i = 0; i < bin.length * 32; i += chrsz)
    str += String.fromCharCode((bin[i>>5] >>> (32 - chrsz - i%32)) & mask);
  return str;
}

/*
 * Convert an array of big-endian words to a hex string.
 */
function binb2hex(binarray)
{
  var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
  var str = "";
  for(var i = 0; i < binarray.length * 4; i++)
  {
    str += hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8+4)) & 0xF) +
           hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8  )) & 0xF);
  }
  return str;
}

/*
 * Convert an array of big-endian words to a base-64 string
 */
function binb2b64(binarray)
{
  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  var str = "";
  for(var i = 0; i < binarray.length * 4; i += 3)
  {
    var triplet = (((binarray[i   >> 2] >> 8 * (3 -  i   %4)) & 0xFF) << 16)
                | (((binarray[i+1 >> 2] >> 8 * (3 - (i+1)%4)) & 0xFF) << 8 )
                |  ((binarray[i+2 >> 2] >> 8 * (3 - (i+2)%4)) & 0xFF);
    for(var j = 0; j < 4; j++)
    {
      if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
      else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
    }
  }
  return str;
}

// aardwulf systems
// This work is licensed under a Creative Commons License.
// http://www.aardwulf.com/tutor/base64/
function encode64(input) {
    var keyStr = "ABCDEFGHIJKLMNOP" +
                "QRSTUVWXYZabcdef" +
                "ghijklmnopqrstuv" +
                "wxyz0123456789+/" +
                "=";

    var output = "";
    var chr1, chr2, chr3 = "";
    var enc1, enc2, enc3, enc4 = "";
    var i = 0;

    do {
        chr1 = input.charCodeAt(i++);
        chr2 = input.charCodeAt(i++);
        chr3 = input.charCodeAt(i++);

        enc1 = chr1 >> 2;
        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
        enc4 = chr3 & 63;

        if (isNaN(chr2)) {
        enc3 = enc4 = 64;
        } else if (isNaN(chr3)) {
        enc4 = 64;
        }

        output = output + 
        keyStr.charAt(enc1) + 
        keyStr.charAt(enc2) + 
        keyStr.charAt(enc3) + 
        keyStr.charAt(enc4);
        chr1 = chr2 = chr3 = "";
        enc1 = enc2 = enc3 = enc4 = "";
    } while (i < input.length);

    return output;
}

// TITLE
// TempersFewGit v 2.1 (ISO 8601 Time/Date script) 
//
// OBJECTIVE
// Javascript script to detect the time zone where a browser
// is and display the date and time in accordance with the 
// ISO 8601 standard.
//
// AUTHOR
// John Walker 
// http://321WebLiftOff.net
// jfwalker@ureach.com
//
// ENCOMIUM
// Thanks to Stephen Pugh for his help.
//
// CREATED
// 2000-09-15T09:42:53+01:00 
//
// REFERENCES
// For more about ISO 8601 see:
// http://www.w3.org/TR/NOTE-datetime
// http://www.cl.cam.ac.uk/~mgk25/iso-time.html
//
// COPYRIGHT
// This script is Copyright  2000 JF Walker All Rights 
// Reserved but may be freely used provided this colophon is 
// included in full.
//
function isodatetime() {
    var today = new Date();
    var year  = today.getYear();
    if (year < 2000)    // Y2K Fix, Isaac Powell
    year = year + 1900; // http://onyx.idbsu.edu/~ipowell
    var month = today.getMonth() + 1;
    var day  = today.getDate();
    var hour = today.getHours();
    var hourUTC = today.getUTCHours();
    var diff = hour - hourUTC;
    if(diff > 12) diff -= 24; // Fix the problem for town with real negative diff
    if(diff <= -12) diff += 24; // Fix the problem for town with real positive diff
    var hourdifference = Math.abs(diff);
    var minute = today.getMinutes();
    var minuteUTC = today.getUTCMinutes();
    var minutedifference;
    var second = today.getSeconds();
    var timezone;
    if (minute != minuteUTC && minuteUTC < 30 && diff < 0) { hourdifference--; }
    if (minute != minuteUTC && minuteUTC > 30 && diff > 0) { hourdifference--; }
    if (minute != minuteUTC) {
    minutedifference = ":30";
    }
    else {
    minutedifference = ":00";
    }
    if (hourdifference < 10) { 
    timezone = "0" + hourdifference + minutedifference;
    }
    else {
    timezone = "" + hourdifference + minutedifference;
    }
    if (diff < 0) {
    timezone = "-" + timezone;
    }
    else {
    timezone = "+" + timezone;
    }
    if (month <= 9) month = "0" + month;
    if (day <= 9) day = "0" + day;
    if (hour <= 9) hour = "0" + hour;
    if (minute <= 9) minute = "0" + minute;
    if (second <= 9) second = "0" + second;
    time = year + "-" + month + "-" + day + "T"
    + hour + ":" + minute + ":" + second + timezone;
    return time;
}

// (C) 2005 Victor R. Ruiz <victor*sixapart.com>
// Code to generate WSSE authentication header
//
// http://www.sixapart.com/pronet/docs/typepad_atom_api
//
// X-WSSE: UsernameToken Username="name", PasswordDigest="digest", Created="timestamp", Nonce="nonce"
//
//  * Username- The username that the user enters (the TypePad username).
//  * Nonce. A secure token generated anew for each HTTP request.
//  * Created. The ISO-8601 timestamp marking when Nonce was created.
//  * PasswordDigest. A SHA-1 digest of the Nonce, Created timestamp, and the password
//    that the user supplies, base64-encoded. In other words, this should be calculated
//    as: base64(sha1(Nonce . Created . Password))
//

function wsse(Password) {
    var PasswordDigest, Nonce, Created;
    var r = new Array;
    
    nonceEncoded = hex_sha1(isodatetime() + String(Math.random()) + 'There is more than words');
    Created = isodatetime();
    PasswordDigest = encode64(hex_sha1(nonceEncoded + Created + Password));

    r[0] = nonceEncoded;
    r[1] = Created;
    r[2] = PasswordDigest;
    return r;
}

function wsseHeader(Username, Password) {
    var w = wsse(Password);
    var header = 'UsernameToken Username="' + Username + '", PasswordDigest="' + w[2] + '", Created="' + w[1] + '", Nonce="' + w[0] + '"';
    return header;
}

//generate the header and set it in the environment
pm.environment.set(
    "wsse-header",
    wsseHeader(pm.environment.get("wsse-user"), pm.environment.get("wsse-secret"))
);

Hi there.

I came across your script and thought I would share my version. You don't need to include library code within the pre-request script:

// https://code.google.com/archive/p/crypto-js/
const crypto = require('crypto-js');

// Get current timestamp in correct format
var timestamp = (new Date()).toISOString();
// Generate Random 32 byte hex string
var nonce = crypto.lib.WordArray.random(16).toString(crypto.enc.Hex);
// Get secret from environment
var secret = pm.environment.get("secret");
// Create SHA1 Hash of the concatenated nonce, timestamp and secret
var hash = crypto.SHA1(nonce + timestamp + secret);
// Convert the hash into a Base64 encoded version of the hash, represented in hex
var passwordDigest = crypto.enc.Base64.stringify(crypto.enc.Utf8.parse(hash.toString(crypto.enc.Hex)));

// Set environment variables ready for the request
pm.environment.set("password_digest", passwordDigest);
pm.environment.set("nonce", nonce);
pm.environment.set("timestampISO", timestamp);

Hope this helps!

@asknoone Thank you! Works nicely. Because I have a lot of requests already defined, I created an env variable with the whole header value:

pm.environment.set("wsse", `UsernameToken Username="${username}", PasswordDigest="${passwordDigest}", Nonce="${nonce}", Created="${timestamp}"`);

@vassyz Thank you for posting too, to build on the last 3 comments I found this script worked perfectly end to end:

// https://code.google.com/archive/p/crypto-js/
const crypto = require('crypto-js');

// Get current timestamp in correct format
var timestamp = (new Date()).toISOString();
// Generate Random 32 byte hex string
var nonce = crypto.lib.WordArray.random(16).toString(crypto.enc.Hex);
// Get secret from environment
var secret = pm.environment.get("secret");
// Create SHA1 Hash of the concatenated nonce, timestamp and secret
var hash = crypto.SHA1(nonce + timestamp + secret);
// Convert the hash into a Base64 encoded version of the hash, represented in hex
var passwordDigest = crypto.enc.Base64.stringify(crypto.enc.Utf8.parse(hash.toString(crypto.enc.Hex)));

// Set environment variables ready for the request
pm.environment.set("password_digest", passwordDigest);
pm.environment.set("nonce", nonce);
pm.environment.set("timestampISO", timestamp);
username = pm.variables.get("username");
pm.environment.set("wsse", `UsernameToken Username="${username}", PasswordDigest="${passwordDigest}", Nonce="${nonce}", Created="${timestamp}"`); 

Note you need a postman environment with the variables, username and secret set and password_digest, nonce, timestampISO and wsse all set to be null.
Then use {{wsse}} as the value for key X-WSSE in your call and job done.

Great.

@vassyz, might be worth updating the revision with the "final" version. ( If you can be bothered! :-) )

@asknoone this is not my gist. I only posted a comment.