sha256-service-now-script-include.js

var Crypto = Class.create();
Crypto.prototype = {
    initialize: function() {

        /**
         * CryptoJS core components.
         */
        var CryptoJS = CryptoJS || (function (Math, undefined) {
                /**
                 * CryptoJS namespace.
                 */
                var C = {};

                /**
                 * Library namespace.
                 */
                var C_lib = C.lib = {};

                /**
                 * Base object for prototypal inheritance.
                 */
                var Base = C_lib.Base = (function () {
                    function F() {}

                    return {
                        /**
                         * Creates a new object that inherits from this object.
                         *
                         * @param {Object} overrides Properties to copy into the new object.
                         *
                         * @return {Object} The new object.
                         *
                         * @static
                         *
                         * @example
                         *
                         *     var MyType = CryptoJS.lib.Base.extend({
                                     *         field: 'value',
                                     *
                                     *         method: function () {
                                     *         }
                                     *     });
                         */
                        extend: function (overrides) {
                            // Spawn
                            F.prototype = this;
                            var subtype = new F();

                            // Augment
                            if (overrides) {
                                subtype.mixIn(overrides);
                            }

                            // Create default initializer
                            if (!subtype.hasOwnProperty('init')) {
                                subtype.init = function () {
                                    subtype.$super.init.apply(this, arguments);
                                };
                            }

                            // Initializer's prototype is the subtype object
                            subtype.init.prototype = subtype;

                            // Reference supertype
                            subtype.$super = this;

                            return subtype;
                        },

                        /**
                         * Extends this object and runs the init method.
                         * Arguments to create() will be passed to init().
                         *
                         * @return {Object} The new object.
                         *
                         * @static
                         *
                         * @example
                         *
                         *     var instance = MyType.create();
                         */
                        create: function () {
                            var instance = this.extend();
                            instance.init.apply(instance, arguments);

                            return instance;
                        },

                        /**
                         * Initializes a newly created object.
                         * Override this method to add some logic when your objects are created.
                         *
                         * @example
                         *
                         *     var MyType = CryptoJS.lib.Base.extend({
                                     *         init: function () {
                                     *             // ...
                                     *         }
                                     *     });
                         */
                        init: function () {
                        },

                        /**
                         * Copies properties into this object.
                         *
                         * @param {Object} properties The properties to mix in.
                         *
                         * @example
                         *
                         *     MyType.mixIn({
                                     *         field: 'value'
                                     *     });
                         */
                        mixIn: function (properties) {
                            for (var propertyName in properties) {
                                if (properties.hasOwnProperty(propertyName)) {
                                    this[propertyName] = properties[propertyName];
                                }
                            }

                            // IE won't copy toString using the loop above
                            if (properties.hasOwnProperty('toString')) {
                                this.toString = properties.toString;
                            }
                        },

                        /**
                         * Creates a copy of this object.
                         *
                         * @return {Object} The clone.
                         *
                         * @example
                         *
                         *     var clone = instance.clone();
                         */
                        clone: function () {
                            return this.init.prototype.extend(this);
                        }
                    };
                }());

                /**
                 * An array of 32-bit words.
                 *
                 * @property {Array} words The array of 32-bit words.
                 * @property {number} sigBytes The number of significant bytes in this word array.
                 */
                var WordArray = C_lib.WordArray = Base.extend({
                    /**
                     * Initializes a newly created word array.
                     *
                     * @param {Array} words (Optional) An array of 32-bit words.
                     * @param {number} sigBytes (Optional) The number of significant bytes in the words.
                     *
                     * @example
                     *
                     *     var wordArray = CryptoJS.lib.WordArray.create();
                     *     var wordArray = CryptoJS.lib.WordArray.create([0x00010203, 0x04050607]);
                     *     var wordArray = CryptoJS.lib.WordArray.create([0x00010203, 0x04050607], 6);
                     */
                    init: function (words, sigBytes) {
                        words = this.words = words || [];

                        if (sigBytes != undefined) {
                            this.sigBytes = sigBytes;
                        } else {
                            this.sigBytes = words.length * 4;
                        }
                    },

                    /**
                     * Converts this word array to a string.
                     *
                     * @param {Encoder} encoder (Optional) The encoding strategy to use. Default: CryptoJS.enc.Hex
                     *
                     * @return {string} The stringified word array.
                     *
                     * @example
                     *
                     *     var string = wordArray + '';
                     *     var string = wordArray.toString();
                     *     var string = wordArray.toString(CryptoJS.enc.Utf8);
                     */
                    toString: function (encoder) {
                        return (encoder || Hex).stringify(this);
                    },

                    /**
                     * Concatenates a word array to this word array.
                     *
                     * @param {WordArray} wordArray The word array to append.
                     *
                     * @return {WordArray} This word array.
                     *
                     * @example
                     *
                     *     wordArray1.concat(wordArray2);
                     */
                    concat: function (wordArray) {
                        // Shortcuts
                        var thisWords = this.words;
                        var thatWords = wordArray.words;
                        var thisSigBytes = this.sigBytes;
                        var thatSigBytes = wordArray.sigBytes;

                        // Clamp excess bits
                        this.clamp();

                        // Concat
                        if (thisSigBytes % 4) {
                            // Copy one byte at a time
                            for (var i = 0; i < thatSigBytes; i++) {
                                var thatByte = (thatWords[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
                                thisWords[(thisSigBytes + i) >>> 2] |= thatByte << (24 - ((thisSigBytes + i) % 4) * 8);
                            }
                        } else if (thatWords.length > 0xffff) {
                            // Copy one word at a time
                            for (var i = 0; i < thatSigBytes; i += 4) {
                                thisWords[(thisSigBytes + i) >>> 2] = thatWords[i >>> 2];
                            }
                        } else {
                            // Copy all words at once
                            thisWords.push.apply(thisWords, thatWords);
                        }
                        this.sigBytes += thatSigBytes;

                        // Chainable
                        return this;
                    },

                    /**
                     * Removes insignificant bits.
                     *
                     * @example
                     *
                     *     wordArray.clamp();
                     */
                    clamp: function () {
                        // Shortcuts
                        var words = this.words;
                        var sigBytes = this.sigBytes;

                        // Clamp
                        words[sigBytes >>> 2] &= 0xffffffff << (32 - (sigBytes % 4) * 8);
                        words.length = Math.ceil(sigBytes / 4);
                    },

                    /**
                     * Creates a copy of this word array.
                     *
                     * @return {WordArray} The clone.
                     *
                     * @example
                     *
                     *     var clone = wordArray.clone();
                     */
                    clone: function () {
                        var clone = Base.clone.call(this);
                        clone.words = this.words.slice(0);

                        return clone;
                    },

                    /**
                     * Creates a word array filled with random bytes.
                     *
                     * @param {number} nBytes The number of random bytes to generate.
                     *
                     * @return {WordArray} The random word array.
                     *
                     * @static
                     *
                     * @example
                     *
                     *     var wordArray = CryptoJS.lib.WordArray.random(16);
                     */
                    random: function (nBytes) {
                        var words = [];
                        for (var i = 0; i < nBytes; i += 4) {
                            words.push((Math.random() * 0x100000000) | 0);
                        }

                        return new WordArray.init(words, nBytes);
                    }
                });

                /**
                 * Encoder namespace.
                 */
                var C_enc = C.enc = {};

                /**
                 * Hex encoding strategy.
                 */
                var Hex = C_enc.Hex = {
                    /**
                     * Converts a word array to a hex string.
                     *
                     * @param {WordArray} wordArray The word array.
                     *
                     * @return {string} The hex string.
                     *
                     * @static
                     *
                     * @example
                     *
                     *     var hexString = CryptoJS.enc.Hex.stringify(wordArray);
                     */
                    stringify: function (wordArray) {
                        // Shortcuts
                        var words = wordArray.words;
                        var sigBytes = wordArray.sigBytes;

                        // Convert
                        var hexChars = [];
                        for (var i = 0; i < sigBytes; i++) {
                            var bite = (words[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
                            hexChars.push((bite >>> 4).toString(16));
                            hexChars.push((bite & 0x0f).toString(16));
                        }

                        return hexChars.join('');
                    },

                    /**
                     * Converts a hex string to a word array.
                     *
                     * @param {string} hexStr The hex string.
                     *
                     * @return {WordArray} The word array.
                     *
                     * @static
                     *
                     * @example
                     *
                     *     var wordArray = CryptoJS.enc.Hex.parse(hexString);
                     */
                    parse: function (hexStr) {
                        // Shortcut
                        var hexStrLength = hexStr.length;

                        // Convert
                        var words = [];
                        for (var i = 0; i < hexStrLength; i += 2) {
                            words[i >>> 3] |= parseInt(hexStr.substr(i, 2), 16) << (24 - (i % 8) * 4);
                        }

                        return new WordArray.init(words, hexStrLength / 2);
                    }
                };

                /**
                 * Latin1 encoding strategy.
                 */
                var Latin1 = C_enc.Latin1 = {
                    /**
                     * Converts a word array to a Latin1 string.
                     *
                     * @param {WordArray} wordArray The word array.
                     *
                     * @return {string} The Latin1 string.
                     *
                     * @static
                     *
                     * @example
                     *
                     *     var latin1String = CryptoJS.enc.Latin1.stringify(wordArray);
                     */
                    stringify: function (wordArray) {
                        // Shortcuts
                        var words = wordArray.words;
                        var sigBytes = wordArray.sigBytes;

                        // Convert
                        var latin1Chars = [];
                        for (var i = 0; i < sigBytes; i++) {
                            var bite = (words[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
                            latin1Chars.push(String.fromCharCode(bite));
                        }

                        return latin1Chars.join('');
                    },

                    /**
                     * Converts a Latin1 string to a word array.
                     *
                     * @param {string} latin1Str The Latin1 string.
                     *
                     * @return {WordArray} The word array.
                     *
                     * @static
                     *
                     * @example
                     *
                     *     var wordArray = CryptoJS.enc.Latin1.parse(latin1String);
                     */
                    parse: function (latin1Str) {
                        // Shortcut
                        var latin1StrLength = latin1Str.length;

                        // Convert
                        var words = [];
                        for (var i = 0; i < latin1StrLength; i++) {
                            words[i >>> 2] |= (latin1Str.charCodeAt(i) & 0xff) << (24 - (i % 4) * 8);
                        }

                        return new WordArray.init(words, latin1StrLength);
                    }
                };

                /**
                 * UTF-8 encoding strategy.
                 */
                var Utf8 = C_enc.Utf8 = {
                    /**
                     * Converts a word array to a UTF-8 string.
                     *
                     * @param {WordArray} wordArray The word array.
                     *
                     * @return {string} The UTF-8 string.
                     *
                     * @static
                     *
                     * @example
                     *
                     *     var utf8String = CryptoJS.enc.Utf8.stringify(wordArray);
                     */
                    stringify: function (wordArray) {
                        try {
                            return decodeURIComponent(escape(Latin1.stringify(wordArray)));
                        } catch (e) {
                            throw new Error('Malformed UTF-8 data');
                        }
                    },

                    /**
                     * Converts a UTF-8 string to a word array.
                     *
                     * @param {string} utf8Str The UTF-8 string.
                     *
                     * @return {WordArray} The word array.
                     *
                     * @static
                     *
                     * @example
                     *
                     *     var wordArray = CryptoJS.enc.Utf8.parse(utf8String);
                     */
                    parse: function (utf8Str) {
                        return Latin1.parse(unescape(encodeURIComponent(utf8Str)));
                    }
                };

                /**
                 * Abstract buffered block algorithm template.
                 *
                 * The property blockSize must be implemented in a concrete subtype.
                 *
                 * @property {number} _minBufferSize The number of blocks that should be kept unprocessed in the buffer. Default: 0
                 */
                var BufferedBlockAlgorithm = C_lib.BufferedBlockAlgorithm = Base.extend({
                    /**
                     * Resets this block algorithm's data buffer to its initial state.
                     *
                     * @example
                     *
                     *     bufferedBlockAlgorithm.reset();
                     */
                    reset: function () {
                        // Initial values
                        this._data = new WordArray.init();
                        this._nDataBytes = 0;
                    },

                    /**
                     * Adds new data to this block algorithm's buffer.
                     *
                     * @param {WordArray|string} data The data to append. Strings are converted to a WordArray using UTF-8.
                     *
                     * @example
                     *
                     *     bufferedBlockAlgorithm._append('data');
                     *     bufferedBlockAlgorithm._append(wordArray);
                     */
                    _append: function (data) {
                        // Convert string to WordArray, else assume WordArray already
                        if (typeof data == 'string') {
                            data = Utf8.parse(data);
                        }

                        // Append
                        this._data.concat(data);
                        this._nDataBytes += data.sigBytes;
                    },

                    /**
                     * Processes available data blocks.
                     *
                     * This method invokes _doProcessBlock(offset), which must be implemented by a concrete subtype.
                     *
                     * @param {boolean} doFlush Whether all blocks and partial blocks should be processed.
                     *
                     * @return {WordArray} The processed data.
                     *
                     * @example
                     *
                     *     var processedData = bufferedBlockAlgorithm._process();
                     *     var processedData = bufferedBlockAlgorithm._process(!!'flush');
                     */
                    _process: function (doFlush) {
                        // Shortcuts
                        var data = this._data;
                        var dataWords = data.words;
                        var dataSigBytes = data.sigBytes;
                        var blockSize = this.blockSize;
                        var blockSizeBytes = blockSize * 4;

                        // Count blocks ready
                        var nBlocksReady = dataSigBytes / blockSizeBytes;
                        if (doFlush) {
                            // Round up to include partial blocks
                            nBlocksReady = Math.ceil(nBlocksReady);
                        } else {
                            // Round down to include only full blocks,
                            // less the number of blocks that must remain in the buffer
                            nBlocksReady = Math.max((nBlocksReady | 0) - this._minBufferSize, 0);
                        }

                        // Count words ready
                        var nWordsReady = nBlocksReady * blockSize;

                        // Count bytes ready
                        var nBytesReady = Math.min(nWordsReady * 4, dataSigBytes);

                        // Process blocks
                        if (nWordsReady) {
                            for (var offset = 0; offset < nWordsReady; offset += blockSize) {
                                // Perform concrete-algorithm logic
                                this._doProcessBlock(dataWords, offset);
                            }

                            // Remove processed words
                            var processedWords = dataWords.splice(0, nWordsReady);
                            data.sigBytes -= nBytesReady;
                        }

                        // Return processed words
                        return new WordArray.init(processedWords, nBytesReady);
                    },

                    /**
                     * Creates a copy of this object.
                     *
                     * @return {Object} The clone.
                     *
                     * @example
                     *
                     *     var clone = bufferedBlockAlgorithm.clone();
                     */
                    clone: function () {
                        var clone = Base.clone.call(this);
                        clone._data = this._data.clone();

                        return clone;
                    },

                    _minBufferSize: 0
                });

                /**
                 * Abstract hasher template.
                 *
                 * @property {number} blockSize The number of 32-bit words this hasher operates on. Default: 16 (512 bits)
                 */
                var Hasher = C_lib.Hasher = BufferedBlockAlgorithm.extend({
                    /**
                     * Configuration options.
                     */
                    cfg: Base.extend(),

                    /**
                     * Initializes a newly created hasher.
                     *
                     * @param {Object} cfg (Optional) The configuration options to use for this hash computation.
                     *
                     * @example
                     *
                     *     var hasher = CryptoJS.algo.SHA256.create();
                     */
                    init: function (cfg) {
                        // Apply config defaults
                        this.cfg = this.cfg.extend(cfg);

                        // Set initial values
                        this.reset();
                    },

                    /**
                     * Resets this hasher to its initial state.
                     *
                     * @example
                     *
                     *     hasher.reset();
                     */
                    reset: function () {
                        // Reset data buffer
                        BufferedBlockAlgorithm.reset.call(this);

                        // Perform concrete-hasher logic
                        this._doReset();
                    },

                    /**
                     * Updates this hasher with a message.
                     *
                     * @param {WordArray|string} messageUpdate The message to append.
                     *
                     * @return {Hasher} This hasher.
                     *
                     * @example
                     *
                     *     hasher.update('message');
                     *     hasher.update(wordArray);
                     */
                    update: function (messageUpdate) {
                        // Append
                        this._append(messageUpdate);

                        // Update the hash
                        this._process();

                        // Chainable
                        return this;
                    },

                    /**
                     * Finalizes the hash computation.
                     * Note that the finalize operation is effectively a destructive, read-once operation.
                     *
                     * @param {WordArray|string} messageUpdate (Optional) A final message update.
                     *
                     * @return {WordArray} The hash.
                     *
                     * @example
                     *
                     *     var hash = hasher.finalize();
                     *     var hash = hasher.finalize('message');
                     *     var hash = hasher.finalize(wordArray);
                     */
                    finalize: function (messageUpdate) {
                        // Final message update
                        if (messageUpdate) {
                            this._append(messageUpdate);
                        }

                        // Perform concrete-hasher logic
                        var hash = this._doFinalize();

                        return hash;
                    },

                    blockSize: 512/32,

                    /**
                     * Creates a shortcut function to a hasher's object interface.
                     *
                     * @param {Hasher} hasher The hasher to create a helper for.
                     *
                     * @return {Function} The shortcut function.
                     *
                     * @static
                     *
                     * @example
                     *
                     *     var SHA256 = CryptoJS.lib.Hasher._createHelper(CryptoJS.algo.SHA256);
                     */
                    _createHelper: function (hasher) {
                        return function (message, cfg) {
                            return new hasher.init(cfg).finalize(message);
                        };
                    },

                    /**
                     * Creates a shortcut function to the HMAC's object interface.
                     *
                     * @param {Hasher} hasher The hasher to use in this HMAC helper.
                     *
                     * @return {Function} The shortcut function.
                     *
                     * @static
                     *
                     * @example
                     *
                     *     var HmacSHA256 = CryptoJS.lib.Hasher._createHmacHelper(CryptoJS.algo.SHA256);
                     */
                    _createHmacHelper: function (hasher) {
                        return function (message, key) {
                            return new C_algo.HMAC.init(hasher, key).finalize(message);
                        };
                    }
                });

                /**
                 * Algorithm namespace.
                 */
                var C_algo = C.algo = {};

                return C;
            }(Math));

        (function (Math) {
            // Shortcuts
            var C = CryptoJS;
            var C_lib = C.lib;
            var WordArray = C_lib.WordArray;
            var Hasher = C_lib.Hasher;
            var C_algo = C.algo;

            // Initialization and round constants tables
            var H = [];
            var K = [];

            // Compute constants
            (function () {
                function isPrime(n) {
                    var sqrtN = Math.sqrt(n);
                    for (var factor = 2; factor <= sqrtN; factor++) {
                        if (!(n % factor)) {
                            return false;
                        }
                    }

                    return true;
                }

                function getFractionalBits(n) {
                    return ((n - (n | 0)) * 0x100000000) | 0;
                }

                var n = 2;
                var nPrime = 0;
                while (nPrime < 64) {
                    if (isPrime(n)) {
                        if (nPrime < 8) {
                            H[nPrime] = getFractionalBits(Math.pow(n, 1 / 2));
                        }
                        K[nPrime] = getFractionalBits(Math.pow(n, 1 / 3));

                        nPrime++;
                    }

                    n++;
                }
            }());

            // Reusable object
            var W = [];

            /**
             * SHA-256 hash algorithm.
             */
            var SHA256 = C_algo.SHA256 = Hasher.extend({
                _doReset: function () {
                    this._hash = new WordArray.init(H.slice(0));
                },

                _doProcessBlock: function (M, offset) {
                    // Shortcut
                    var H = this._hash.words;

                    // Working variables
                    var a = H[0];
                    var b = H[1];
                    var c = H[2];
                    var d = H[3];
                    var e = H[4];
                    var f = H[5];
                    var g = H[6];
                    var h = H[7];

                    // Computation
                    for (var i = 0; i < 64; i++) {
                        if (i < 16) {
                            W[i] = M[offset + i] | 0;
                        } else {
                            var gamma0x = W[i - 15];
                            var gamma0  = ((gamma0x << 25) | (gamma0x >>> 7))  ^
                                ((gamma0x << 14) | (gamma0x >>> 18)) ^
                                (gamma0x >>> 3);

                            var gamma1x = W[i - 2];
                            var gamma1  = ((gamma1x << 15) | (gamma1x >>> 17)) ^
                                ((gamma1x << 13) | (gamma1x >>> 19)) ^
                                (gamma1x >>> 10);

                            W[i] = gamma0 + W[i - 7] + gamma1 + W[i - 16];
                        }

                        var ch  = (e & f) ^ (~e & g);
                        var maj = (a & b) ^ (a & c) ^ (b & c);

                        var sigma0 = ((a << 30) | (a >>> 2)) ^ ((a << 19) | (a >>> 13)) ^ ((a << 10) | (a >>> 22));
                        var sigma1 = ((e << 26) | (e >>> 6)) ^ ((e << 21) | (e >>> 11)) ^ ((e << 7)  | (e >>> 25));

                        var t1 = h + sigma1 + ch + K[i] + W[i];
                        var t2 = sigma0 + maj;

                        h = g;
                        g = f;
                        f = e;
                        e = (d + t1) | 0;
                        d = c;
                        c = b;
                        b = a;
                        a = (t1 + t2) | 0;
                    }

                    // Intermediate hash value
                    H[0] = (H[0] + a) | 0;
                    H[1] = (H[1] + b) | 0;
                    H[2] = (H[2] + c) | 0;
                    H[3] = (H[3] + d) | 0;
                    H[4] = (H[4] + e) | 0;
                    H[5] = (H[5] + f) | 0;
                    H[6] = (H[6] + g) | 0;
                    H[7] = (H[7] + h) | 0;
                },

                _doFinalize: function () {
                    // Shortcuts
                    var data = this._data;
                    var dataWords = data.words;

                    var nBitsTotal = this._nDataBytes * 8;
                    var nBitsLeft = data.sigBytes * 8;

                    // Add padding
                    dataWords[nBitsLeft >>> 5] |= 0x80 << (24 - nBitsLeft % 32);
                    dataWords[(((nBitsLeft + 64) >>> 9) << 4) + 14] = Math.floor(nBitsTotal / 0x100000000);
                    dataWords[(((nBitsLeft + 64) >>> 9) << 4) + 15] = nBitsTotal;
                    data.sigBytes = dataWords.length * 4;

                    // Hash final blocks
                    this._process();

                    // Return final computed hash
                    return this._hash;
                },

                clone: function () {
                    var clone = Hasher.clone.call(this);
                    clone._hash = this._hash.clone();

                    return clone;
                }
            });

            /**
             * Shortcut function to the hasher's object interface.
             *
             * @param {WordArray|string} message The message to hash.
             *
             * @return {WordArray} The hash.
             *
             * @static
             *
             * @example
             *
             *     var hash = CryptoJS.SHA256('message');
             *     var hash = CryptoJS.SHA256(wordArray);
             */
            C.SHA256 = Hasher._createHelper(SHA256);

            /**
             * Shortcut function to the HMAC's object interface.
             *
             * @param {WordArray|string} message The message to hash.
             * @param {WordArray|string} key The secret key.
             *
             * @return {WordArray} The HMAC.
             *
             * @static
             *
             * @example
             *
             *     var hmac = CryptoJS.HmacSHA256(message, key);
             */
            C.HmacSHA256 = Hasher._createHmacHelper(SHA256);
        }(Math));



        this.CryptoJS = CryptoJS;
    },
    type: 'Crypto'
};

Hi, could you let me know how i can use this in service now? How do I actually make the call to create the hash?
Thanks.

Hi, do you know how to use this code?

Hello @igable,

I am using cryptoJS Lib for generating Hex HMACSHA256 signature for AWS4 request in servicenow.Its working fine in custom application scope but in sn_capi (cloud api) scope of servicenow throws me error "undefined properties".Do anyone have idea what can be the problem.