diff options
Diffstat (limited to 'library/cryptojs/components/sha256.js')
| -rw-r--r-- | library/cryptojs/components/sha256.js | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/library/cryptojs/components/sha256.js b/library/cryptojs/components/sha256.js new file mode 100644 index 000000000..16cee0cfd --- /dev/null +++ b/library/cryptojs/components/sha256.js @@ -0,0 +1,185 @@ +/* +CryptoJS v3.1.2 +code.google.com/p/crypto-js +(c) 2009-2013 by Jeff Mott. All rights reserved. +code.google.com/p/crypto-js/wiki/License +*/ +(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));
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