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sha.js

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+/*   
+ *   A   JavaScript   implementation   of   the   Secure   Hash   Algorithm,   SHA-1,   as   defined   
+ *   in   FIPS   PUB   180-1   
+ *   Version   2.1-BETA   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) << (24 - 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] >>> (24 - 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;
+}