Javascript SHA512 implementation

sha512.js

(function () {
    // Shortcuts
    var C = CryptoJS;
    var C_lib = C.lib;
    var Hasher = C_lib.Hasher;
    var C_x64 = C.x64;
    var X64Word = C_x64.Word;
    var X64WordArray = C_x64.WordArray;
    var C_algo = C.algo;

    function X64Word_create() {
        return X64Word.create.apply(X64Word, arguments);
    }

    // Constants
    var K = [
        X64Word_create(0x428a2f98, 0xd728ae22), X64Word_create(0x71374491, 0x23ef65cd),
        X64Word_create(0xb5c0fbcf, 0xec4d3b2f), X64Word_create(0xe9b5dba5, 0x8189dbbc),
        X64Word_create(0x3956c25b, 0xf348b538), X64Word_create(0x59f111f1, 0xb605d019),
        X64Word_create(0x923f82a4, 0xaf194f9b), X64Word_create(0xab1c5ed5, 0xda6d8118),
        X64Word_create(0xd807aa98, 0xa3030242), X64Word_create(0x12835b01, 0x45706fbe),
        X64Word_create(0x243185be, 0x4ee4b28c), X64Word_create(0x550c7dc3, 0xd5ffb4e2),
        X64Word_create(0x72be5d74, 0xf27b896f), X64Word_create(0x80deb1fe, 0x3b1696b1),
        X64Word_create(0x9bdc06a7, 0x25c71235), X64Word_create(0xc19bf174, 0xcf692694),
        X64Word_create(0xe49b69c1, 0x9ef14ad2), X64Word_create(0xefbe4786, 0x384f25e3),
        X64Word_create(0x0fc19dc6, 0x8b8cd5b5), X64Word_create(0x240ca1cc, 0x77ac9c65),
        X64Word_create(0x2de92c6f, 0x592b0275), X64Word_create(0x4a7484aa, 0x6ea6e483),
        X64Word_create(0x5cb0a9dc, 0xbd41fbd4), X64Word_create(0x76f988da, 0x831153b5),
        X64Word_create(0x983e5152, 0xee66dfab), X64Word_create(0xa831c66d, 0x2db43210),
        X64Word_create(0xb00327c8, 0x98fb213f), X64Word_create(0xbf597fc7, 0xbeef0ee4),
        X64Word_create(0xc6e00bf3, 0x3da88fc2), X64Word_create(0xd5a79147, 0x930aa725),
        X64Word_create(0x06ca6351, 0xe003826f), X64Word_create(0x14292967, 0x0a0e6e70),
        X64Word_create(0x27b70a85, 0x46d22ffc), X64Word_create(0x2e1b2138, 0x5c26c926),
        X64Word_create(0x4d2c6dfc, 0x5ac42aed), X64Word_create(0x53380d13, 0x9d95b3df),
        X64Word_create(0x650a7354, 0x8baf63de), X64Word_create(0x766a0abb, 0x3c77b2a8),
        X64Word_create(0x81c2c92e, 0x47edaee6), X64Word_create(0x92722c85, 0x1482353b),
        X64Word_create(0xa2bfe8a1, 0x4cf10364), X64Word_create(0xa81a664b, 0xbc423001),
        X64Word_create(0xc24b8b70, 0xd0f89791), X64Word_create(0xc76c51a3, 0x0654be30),
        X64Word_create(0xd192e819, 0xd6ef5218), X64Word_create(0xd6990624, 0x5565a910),
        X64Word_create(0xf40e3585, 0x5771202a), X64Word_create(0x106aa070, 0x32bbd1b8),
        X64Word_create(0x19a4c116, 0xb8d2d0c8), X64Word_create(0x1e376c08, 0x5141ab53),
        X64Word_create(0x2748774c, 0xdf8eeb99), X64Word_create(0x34b0bcb5, 0xe19b48a8),
        X64Word_create(0x391c0cb3, 0xc5c95a63), X64Word_create(0x4ed8aa4a, 0xe3418acb),
        X64Word_create(0x5b9cca4f, 0x7763e373), X64Word_create(0x682e6ff3, 0xd6b2b8a3),
        X64Word_create(0x748f82ee, 0x5defb2fc), X64Word_create(0x78a5636f, 0x43172f60),
        X64Word_create(0x84c87814, 0xa1f0ab72), X64Word_create(0x8cc70208, 0x1a6439ec),
        X64Word_create(0x90befffa, 0x23631e28), X64Word_create(0xa4506ceb, 0xde82bde9),
        X64Word_create(0xbef9a3f7, 0xb2c67915), X64Word_create(0xc67178f2, 0xe372532b),
        X64Word_create(0xca273ece, 0xea26619c), X64Word_create(0xd186b8c7, 0x21c0c207),
        X64Word_create(0xeada7dd6, 0xcde0eb1e), X64Word_create(0xf57d4f7f, 0xee6ed178),
        X64Word_create(0x06f067aa, 0x72176fba), X64Word_create(0x0a637dc5, 0xa2c898a6),
        X64Word_create(0x113f9804, 0xbef90dae), X64Word_create(0x1b710b35, 0x131c471b),
        X64Word_create(0x28db77f5, 0x23047d84), X64Word_create(0x32caab7b, 0x40c72493),
        X64Word_create(0x3c9ebe0a, 0x15c9bebc), X64Word_create(0x431d67c4, 0x9c100d4c),
        X64Word_create(0x4cc5d4be, 0xcb3e42b6), X64Word_create(0x597f299c, 0xfc657e2a),
        X64Word_create(0x5fcb6fab, 0x3ad6faec), X64Word_create(0x6c44198c, 0x4a475817)
    ];

    // Reusable objects
    var W = [];
    (function () {
        for (var i = 0; i < 80; i++) {
            W[i] = X64Word_create();
        }
    }());

    /**
     * SHA-512 hash algorithm.
     */
    var SHA512 = C_algo.SHA512 = Hasher.extend({
        _doReset: function () {
            this._hash = X64WordArray.create([
                X64Word_create(0x6a09e667, 0xf3bcc908), X64Word_create(0xbb67ae85, 0x84caa73b),
                X64Word_create(0x3c6ef372, 0xfe94f82b), X64Word_create(0xa54ff53a, 0x5f1d36f1),
                X64Word_create(0x510e527f, 0xade682d1), X64Word_create(0x9b05688c, 0x2b3e6c1f),
                X64Word_create(0x1f83d9ab, 0xfb41bd6b), X64Word_create(0x5be0cd19, 0x137e2179)
            ]);
        },

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

            var H0 = H[0];
            var H1 = H[1];
            var H2 = H[2];
            var H3 = H[3];
            var H4 = H[4];
            var H5 = H[5];
            var H6 = H[6];
            var H7 = H[7];

            var H0h = H0.high;
            var H0l = H0.low;
            var H1h = H1.high;
            var H1l = H1.low;
            var H2h = H2.high;
            var H2l = H2.low;
            var H3h = H3.high;
            var H3l = H3.low;
            var H4h = H4.high;
            var H4l = H4.low;
            var H5h = H5.high;
            var H5l = H5.low;
            var H6h = H6.high;
            var H6l = H6.low;
            var H7h = H7.high;
            var H7l = H7.low;

            // Working variables
            var ah = H0h;
            var al = H0l;
            var bh = H1h;
            var bl = H1l;
            var ch = H2h;
            var cl = H2l;
            var dh = H3h;
            var dl = H3l;
            var eh = H4h;
            var el = H4l;
            var fh = H5h;
            var fl = H5l;
            var gh = H6h;
            var gl = H6l;
            var hh = H7h;
            var hl = H7l;

            // Rounds
            for (var i = 0; i < 80; i++) {
                // Shortcut
                var Wi = W[i];

                // Extend message
                if (i < 16) {
                    var Wih = Wi.high = M[offset + i * 2]     | 0;
                    var Wil = Wi.low  = M[offset + i * 2 + 1] | 0;
                } else {
                    // Gamma0
                    var gamma0x  = W[i - 15];
                    var gamma0xh = gamma0x.high;
                    var gamma0xl = gamma0x.low;
                    var gamma0h  = ((gamma0xh >>> 1) | (gamma0xl << 31)) ^ ((gamma0xh >>> 8) | (gamma0xl << 24)) ^ (gamma0xh >>> 7);
                    var gamma0l  = ((gamma0xl >>> 1) | (gamma0xh << 31)) ^ ((gamma0xl >>> 8) | (gamma0xh << 24)) ^ ((gamma0xl >>> 7) | (gamma0xh << 25));

                    // Gamma1
                    var gamma1x  = W[i - 2];
                    var gamma1xh = gamma1x.high;
                    var gamma1xl = gamma1x.low;
                    var gamma1h  = ((gamma1xh >>> 19) | (gamma1xl << 13)) ^ ((gamma1xh << 3) | (gamma1xl >>> 29)) ^ (gamma1xh >>> 6);
                    var gamma1l  = ((gamma1xl >>> 19) | (gamma1xh << 13)) ^ ((gamma1xl << 3) | (gamma1xh >>> 29)) ^ ((gamma1xl >>> 6) | (gamma1xh << 26));

                    // W[i] = gamma0 + W[i - 7] + gamma1 + W[i - 16]
                    var Wi7  = W[i - 7];
                    var Wi7h = Wi7.high;
                    var Wi7l = Wi7.low;

                    var Wi16  = W[i - 16];
                    var Wi16h = Wi16.high;
                    var Wi16l = Wi16.low;

                    var Wil = gamma0l + Wi7l;
                    var Wih = gamma0h + Wi7h + ((Wil >>> 0) < (gamma0l >>> 0) ? 1 : 0);
                    var Wil = Wil + gamma1l;
                    var Wih = Wih + gamma1h + ((Wil >>> 0) < (gamma1l >>> 0) ? 1 : 0);
                    var Wil = Wil + Wi16l;
                    var Wih = Wih + Wi16h + ((Wil >>> 0) < (Wi16l >>> 0) ? 1 : 0);

                    Wi.high = Wih;
                    Wi.low  = Wil;
                }

                var chh  = (eh & fh) ^ (~eh & gh);
                var chl  = (el & fl) ^ (~el & gl);
                var majh = (ah & bh) ^ (ah & ch) ^ (bh & ch);
                var majl = (al & bl) ^ (al & cl) ^ (bl & cl);

                var sigma0h = ((ah >>> 28) | (al << 4))  ^ ((ah << 30)  | (al >>> 2)) ^ ((ah << 25) | (al >>> 7));
                var sigma0l = ((al >>> 28) | (ah << 4))  ^ ((al << 30)  | (ah >>> 2)) ^ ((al << 25) | (ah >>> 7));
                var sigma1h = ((eh >>> 14) | (el << 18)) ^ ((eh >>> 18) | (el << 14)) ^ ((eh << 23) | (el >>> 9));
                var sigma1l = ((el >>> 14) | (eh << 18)) ^ ((el >>> 18) | (eh << 14)) ^ ((el << 23) | (eh >>> 9));

                // t1 = h + sigma1 + ch + K[i] + W[i]
                var Ki  = K[i];
                var Kih = Ki.high;
                var Kil = Ki.low;

                var t1l = hl + sigma1l;
                var t1h = hh + sigma1h + ((t1l >>> 0) < (hl >>> 0) ? 1 : 0);
                var t1l = t1l + chl;
                var t1h = t1h + chh + ((t1l >>> 0) < (chl >>> 0) ? 1 : 0);
                var t1l = t1l + Kil;
                var t1h = t1h + Kih + ((t1l >>> 0) < (Kil >>> 0) ? 1 : 0);
                var t1l = t1l + Wil;
                var t1h = t1h + Wih + ((t1l >>> 0) < (Wil >>> 0) ? 1 : 0);

                var t2l = sigma0l + majl;
                var t2h = sigma0h + majh + ((t2l >>> 0) < (sigma0l >>> 0) ? 1 : 0);

                // Update working variables
                hh = gh;
                hl = gl;
                gh = fh;
                gl = fl;
                fh = eh;
                fl = el;
                el = (dl + t1l) | 0;
                eh = (dh + t1h + ((el >>> 0) < (dl >>> 0) ? 1 : 0)) | 0;
                dh = ch;
                dl = cl;
                ch = bh;
                cl = bl;
                bh = ah;
                bl = al;
                al = (t1l + t2l) | 0;
                ah = (t1h + t2h + ((al >>> 0) < (t1l >>> 0) ? 1 : 0)) | 0;
            }

            // Intermediate hash value
            H0l = H0.low  = (H0l + al);
            H0.high = (H0h + ah + ((H0l >>> 0) < (al >>> 0) ? 1 : 0));
            H1l = H1.low  = (H1l + bl);
            H1.high = (H1h + bh + ((H1l >>> 0) < (bl >>> 0) ? 1 : 0));
            H2l = H2.low  = (H2l + cl);
            H2.high = (H2h + ch + ((H2l >>> 0) < (cl >>> 0) ? 1 : 0));
            H3l = H3.low  = (H3l + dl);
            H3.high = (H3h + dh + ((H3l >>> 0) < (dl >>> 0) ? 1 : 0));
            H4l = H4.low  = (H4l + el);
            H4.high = (H4h + eh + ((H4l >>> 0) < (el >>> 0) ? 1 : 0));
            H5l = H5.low  = (H5l + fl);
            H5.high = (H5h + fh + ((H5l >>> 0) < (fl >>> 0) ? 1 : 0));
            H6l = H6.low  = (H6l + gl);
            H6.high = (H6h + gh + ((H6l >>> 0) < (gl >>> 0) ? 1 : 0));
            H7l = H7.low  = (H7l + hl);
            H7.high = (H7h + hh + ((H7l >>> 0) < (hl >>> 0) ? 1 : 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 + 128) >>> 10) << 5) + 31] = nBitsTotal;
            data.sigBytes = dataWords.length * 4;

            // Hash final blocks
            this._process();

            // Convert hash to 32-bit word array before returning
            this._hash = this._hash.toX32();
        },

        blockSize: 1024/32
    });

    /**
     * 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.SHA512('message');
     *     var hash = CryptoJS.SHA512(wordArray);
     */
    C.SHA512 = Hasher._createHelper(SHA512);

    /**
     * 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.HmacSHA512(message, key);
     */
    C.HmacSHA512 = Hasher._createHmacHelper(SHA512);
}());