178 lines
5.4 KiB
JavaScript
178 lines
5.4 KiB
JavaScript
/*
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* A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
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* Digest Algorithm, as defined in RFC 1321.
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* Copyright (C) Paul Johnston 1999 - 2000.
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* Updated by Greg Holt 2000 - 2001.
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* See http://pajhome.org.uk/site/legal.html for details.
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*/
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/**
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* Take a string and return the hex representation of its MD5.
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* @arg string
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*/
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function calcMD5(str)
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{
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x = str2blks_MD5(str);
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a = 1732584193;
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b = -271733879;
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c = -1732584194;
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d = 271733878;
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for(i = 0; i < x.length; i += 16)
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{
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olda = a;
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oldb = b;
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oldc = c;
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oldd = d;
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a = ff(a, b, c, d, x[i+ 0], 7 , -680876936);
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d = ff(d, a, b, c, x[i+ 1], 12, -389564586);
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c = ff(c, d, a, b, x[i+ 2], 17, 606105819);
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b = ff(b, c, d, a, x[i+ 3], 22, -1044525330);
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a = ff(a, b, c, d, x[i+ 4], 7 , -176418897);
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d = ff(d, a, b, c, x[i+ 5], 12, 1200080426);
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c = ff(c, d, a, b, x[i+ 6], 17, -1473231341);
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b = ff(b, c, d, a, x[i+ 7], 22, -45705983);
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a = ff(a, b, c, d, x[i+ 8], 7 , 1770035416);
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d = ff(d, a, b, c, x[i+ 9], 12, -1958414417);
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c = ff(c, d, a, b, x[i+10], 17, -42063);
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b = ff(b, c, d, a, x[i+11], 22, -1990404162);
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a = ff(a, b, c, d, x[i+12], 7 , 1804603682);
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d = ff(d, a, b, c, x[i+13], 12, -40341101);
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c = ff(c, d, a, b, x[i+14], 17, -1502002290);
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b = ff(b, c, d, a, x[i+15], 22, 1236535329);
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a = gg(a, b, c, d, x[i+ 1], 5 , -165796510);
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d = gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
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c = gg(c, d, a, b, x[i+11], 14, 643717713);
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b = gg(b, c, d, a, x[i+ 0], 20, -373897302);
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a = gg(a, b, c, d, x[i+ 5], 5 , -701558691);
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d = gg(d, a, b, c, x[i+10], 9 , 38016083);
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c = gg(c, d, a, b, x[i+15], 14, -660478335);
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b = gg(b, c, d, a, x[i+ 4], 20, -405537848);
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a = gg(a, b, c, d, x[i+ 9], 5 , 568446438);
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d = gg(d, a, b, c, x[i+14], 9 , -1019803690);
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c = gg(c, d, a, b, x[i+ 3], 14, -187363961);
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b = gg(b, c, d, a, x[i+ 8], 20, 1163531501);
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a = gg(a, b, c, d, x[i+13], 5 , -1444681467);
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d = gg(d, a, b, c, x[i+ 2], 9 , -51403784);
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c = gg(c, d, a, b, x[i+ 7], 14, 1735328473);
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b = gg(b, c, d, a, x[i+12], 20, -1926607734);
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a = hh(a, b, c, d, x[i+ 5], 4 , -378558);
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d = hh(d, a, b, c, x[i+ 8], 11, -2022574463);
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c = hh(c, d, a, b, x[i+11], 16, 1839030562);
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b = hh(b, c, d, a, x[i+14], 23, -35309556);
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a = hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
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d = hh(d, a, b, c, x[i+ 4], 11, 1272893353);
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c = hh(c, d, a, b, x[i+ 7], 16, -155497632);
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b = hh(b, c, d, a, x[i+10], 23, -1094730640);
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a = hh(a, b, c, d, x[i+13], 4 , 681279174);
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d = hh(d, a, b, c, x[i+ 0], 11, -358537222);
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c = hh(c, d, a, b, x[i+ 3], 16, -722521979);
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b = hh(b, c, d, a, x[i+ 6], 23, 76029189);
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a = hh(a, b, c, d, x[i+ 9], 4 , -640364487);
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d = hh(d, a, b, c, x[i+12], 11, -421815835);
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c = hh(c, d, a, b, x[i+15], 16, 530742520);
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b = hh(b, c, d, a, x[i+ 2], 23, -995338651);
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a = ii(a, b, c, d, x[i+ 0], 6 , -198630844);
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d = ii(d, a, b, c, x[i+ 7], 10, 1126891415);
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c = ii(c, d, a, b, x[i+14], 15, -1416354905);
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b = ii(b, c, d, a, x[i+ 5], 21, -57434055);
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a = ii(a, b, c, d, x[i+12], 6 , 1700485571);
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d = ii(d, a, b, c, x[i+ 3], 10, -1894986606);
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c = ii(c, d, a, b, x[i+10], 15, -1051523);
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b = ii(b, c, d, a, x[i+ 1], 21, -2054922799);
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a = ii(a, b, c, d, x[i+ 8], 6 , 1873313359);
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d = ii(d, a, b, c, x[i+15], 10, -30611744);
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c = ii(c, d, a, b, x[i+ 6], 15, -1560198380);
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b = ii(b, c, d, a, x[i+13], 21, 1309151649);
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a = ii(a, b, c, d, x[i+ 4], 6 , -145523070);
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d = ii(d, a, b, c, x[i+11], 10, -1120210379);
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c = ii(c, d, a, b, x[i+ 2], 15, 718787259);
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b = ii(b, c, d, a, x[i+ 9], 21, -343485551);
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a = add(a, olda);
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b = add(b, oldb);
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c = add(c, oldc);
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d = add(d, oldd);
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}
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return rhex(a) + rhex(b) + rhex(c) + rhex(d);
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}
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/*
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* Convert a 32-bit number to a hex string with ls-byte first
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*/
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var hex_chr = "0123456789abcdef";
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function rhex(num)
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{
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str = "";
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for(j = 0; j <= 3; j++)
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str += hex_chr.charAt((num >> (j * 8 + 4)) & 0x0F) +
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hex_chr.charAt((num >> (j * 8)) & 0x0F);
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return str;
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}
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/*
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* Convert a string to a sequence of 16-word blocks, stored as an array.
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* Append padding bits and the length, as described in the MD5 standard.
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*/
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function str2blks_MD5(str)
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{
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nblk = ((str.length + 8) >> 6) + 1;
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blks = new Array(nblk * 16);
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for(i = 0; i < nblk * 16; i++) blks[i] = 0;
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for(i = 0; i < str.length; i++)
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blks[i >> 2] |= str.charCodeAt(i) << ((i % 4) * 8);
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blks[i >> 2] |= 0x80 << ((i % 4) * 8);
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blks[nblk * 16 - 2] = str.length * 8;
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return blks;
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}
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/*
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* Add integers, wrapping at 2^32. This uses 16-bit operations internally
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* to work around bugs in some JS interpreters.
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*/
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function add(x, y)
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{
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var lsw = (x & 0xFFFF) + (y & 0xFFFF);
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var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
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return (msw << 16) | (lsw & 0xFFFF);
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}
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/*
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* Bitwise rotate a 32-bit number to the left
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*/
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function rol(num, cnt)
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{
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return (num << cnt) | (num >>> (32 - cnt));
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}
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/*
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* These functions implement the basic operation for each round of the
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* algorithm.
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*/
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function cmn(q, a, b, x, s, t)
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{
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return add(rol(add(add(a, q), add(x, t)), s), b);
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}
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function ff(a, b, c, d, x, s, t)
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{
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return cmn((b & c) | ((~b) & d), a, b, x, s, t);
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}
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function gg(a, b, c, d, x, s, t)
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{
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return cmn((b & d) | (c & (~d)), a, b, x, s, t);
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}
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function hh(a, b, c, d, x, s, t)
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{
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return cmn(b ^ c ^ d, a, b, x, s, t);
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}
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function ii(a, b, c, d, x, s, t)
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{
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return cmn(c ^ (b | (~d)), a, b, x, s, t);
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}
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