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Diffstat (limited to 'src/Md5.js')
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diff --git a/src/Md5.js b/src/Md5.js new file mode 100644 index 0000000..65c8c44 --- /dev/null +++ b/src/Md5.js @@ -0,0 +1,226 @@ +/* + * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message + * Digest Algorithm, as defined in RFC 1321. + * Copyright (C) Paul Johnston 1999 - 2000. + * Updated by Greg Holt 2000 - 2001. + * See http://pajhome.org.uk/site/legal.html for details. + +The BSD License +--------------- +Copyright (c) 1998 - 2002, Paul Johnston & Contributors +All rights reserved. + +Redistribution and use in source and binary forms, with or without modification, +are permitted provided that the following conditions are met: + +Redistributions of source code must retain the above copyright notice, this list +of conditions and the following disclaimer. Redistributions in binary form must +reproduce the above copyright notice, this list of conditions and the following +disclaimer in the documentation and/or other materials provided with the distribution. + +Neither the name of Paul Johnston nor pajhome.org.uk nor the names of its contributors +may be used to endorse or promote products derived from this software without specific +prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY +EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT +SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, +INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED +TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR +BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN +ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH +DAMAGE. + +JavaScript MD5 +-------------- +The JavaScript code implementing the algorithm is derived from the C code in RFC 1321 +and is covered by the following copyright: + +Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved. +License to copy and use this software is granted provided that it is identified as +the "RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning +or referencing this software or this function. + +License is also granted to make and use derivative works provided that such works are +identified as "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm" +in all material mentioning or referencing the derived work. + +RSA Data Security, Inc. makes no representations concerning either the merchantability +of this software or the suitability of this software for any particular purpose. It is +provided "as is" without express or implied warranty of any kind. + +These notices must be retained in any copies of any part of this documentation and/or +software. + +This copyright does not prohibit distribution of the JavaScript MD5 code under the +BSD license. + */ + +/* + * Convert a 32-bit number to a hex string with ls-byte first + */ +var hex_chr = "0123456789abcdef"; +function rhex(num) +{ + str = ""; + for(j = 0; j <= 3; j++) + str += hex_chr.charAt((num >> (j * 8 + 4)) & 0x0F) + + hex_chr.charAt((num >> (j * 8)) & 0x0F); + return str; +} + +/* + * Convert a string to a sequence of 16-word blocks, stored as an array. + * Append padding bits and the length, as described in the MD5 standard. + */ +function str2blks_MD5(str) +{ + nblk = ((str.length + 8) >> 6) + 1; + blks = new Array(nblk * 16); + for(i = 0; i < nblk * 16; i++) blks[i] = 0; + for(i = 0; i < str.length; i++) + blks[i >> 2] |= str.charCodeAt(i) << ((i % 4) * 8); + blks[i >> 2] |= 0x80 << ((i % 4) * 8); + blks[nblk * 16 - 2] = str.length * 8; + return blks; +} + +/* + * Add integers, wrapping at 2^32. This uses 16-bit operations internally + * to work around bugs in some JS interpreters. + */ +function 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)); +} + +/* + * These functions implement the basic operation for each round of the + * algorithm. + */ +function cmn(q, a, b, x, s, t) +{ + return add(rol(add(add(a, q), add(x, t)), s), b); +} +function ff(a, b, c, d, x, s, t) +{ + return cmn((b & c) | ((~b) & d), a, b, x, s, t); +} +function gg(a, b, c, d, x, s, t) +{ + return cmn((b & d) | (c & (~d)), a, b, x, s, t); +} +function hh(a, b, c, d, x, s, t) +{ + return cmn(b ^ c ^ d, a, b, x, s, t); +} +function ii(a, b, c, d, x, s, t) +{ + return cmn(c ^ (b | (~d)), a, b, x, s, t); +} + +/* + * Take a string and return the hex representation of its MD5. + */ +function calcMD5(str) +{ + x = str2blks_MD5(str); + a = 1732584193; + b = -271733879; + c = -1732584194; + d = 271733878; + + for(i = 0; i < x.length; i += 16) + { + olda = a; + oldb = b; + oldc = c; + oldd = d; + + a = ff(a, b, c, d, x[i+ 0], 7 , -680876936); + d = ff(d, a, b, c, x[i+ 1], 12, -389564586); + c = ff(c, d, a, b, x[i+ 2], 17, 606105819); + b = ff(b, c, d, a, x[i+ 3], 22, -1044525330); + a = ff(a, b, c, d, x[i+ 4], 7 , -176418897); + d = ff(d, a, b, c, x[i+ 5], 12, 1200080426); + c = ff(c, d, a, b, x[i+ 6], 17, -1473231341); + b = ff(b, c, d, a, x[i+ 7], 22, -45705983); + a = ff(a, b, c, d, x[i+ 8], 7 , 1770035416); + d = ff(d, a, b, c, x[i+ 9], 12, -1958414417); + c = ff(c, d, a, b, x[i+10], 17, -42063); + b = ff(b, c, d, a, x[i+11], 22, -1990404162); + a = ff(a, b, c, d, x[i+12], 7 , 1804603682); + d = ff(d, a, b, c, x[i+13], 12, -40341101); + c = ff(c, d, a, b, x[i+14], 17, -1502002290); + b = ff(b, c, d, a, x[i+15], 22, 1236535329); + + a = gg(a, b, c, d, x[i+ 1], 5 , -165796510); + d = gg(d, a, b, c, x[i+ 6], 9 , -1069501632); + c = gg(c, d, a, b, x[i+11], 14, 643717713); + b = gg(b, c, d, a, x[i+ 0], 20, -373897302); + a = gg(a, b, c, d, x[i+ 5], 5 , -701558691); + d = gg(d, a, b, c, x[i+10], 9 , 38016083); + c = gg(c, d, a, b, x[i+15], 14, -660478335); + b = gg(b, c, d, a, x[i+ 4], 20, -405537848); + a = gg(a, b, c, d, x[i+ 9], 5 , 568446438); + d = gg(d, a, b, c, x[i+14], 9 , -1019803690); + c = gg(c, d, a, b, x[i+ 3], 14, -187363961); + b = gg(b, c, d, a, x[i+ 8], 20, 1163531501); + a = gg(a, b, c, d, x[i+13], 5 , -1444681467); + d = gg(d, a, b, c, x[i+ 2], 9 , -51403784); + c = gg(c, d, a, b, x[i+ 7], 14, 1735328473); + b = gg(b, c, d, a, x[i+12], 20, -1926607734); + + a = hh(a, b, c, d, x[i+ 5], 4 , -378558); + d = hh(d, a, b, c, x[i+ 8], 11, -2022574463); + c = hh(c, d, a, b, x[i+11], 16, 1839030562); + b = hh(b, c, d, a, x[i+14], 23, -35309556); + a = hh(a, b, c, d, x[i+ 1], 4 , -1530992060); + d = hh(d, a, b, c, x[i+ 4], 11, 1272893353); + c = hh(c, d, a, b, x[i+ 7], 16, -155497632); + b = hh(b, c, d, a, x[i+10], 23, -1094730640); + a = hh(a, b, c, d, x[i+13], 4 , 681279174); + d = hh(d, a, b, c, x[i+ 0], 11, -358537222); + c = hh(c, d, a, b, x[i+ 3], 16, -722521979); + b = hh(b, c, d, a, x[i+ 6], 23, 76029189); + a = hh(a, b, c, d, x[i+ 9], 4 , -640364487); + d = hh(d, a, b, c, x[i+12], 11, -421815835); + c = hh(c, d, a, b, x[i+15], 16, 530742520); + b = hh(b, c, d, a, x[i+ 2], 23, -995338651); + + a = ii(a, b, c, d, x[i+ 0], 6 , -198630844); + d = ii(d, a, b, c, x[i+ 7], 10, 1126891415); + c = ii(c, d, a, b, x[i+14], 15, -1416354905); + b = ii(b, c, d, a, x[i+ 5], 21, -57434055); + a = ii(a, b, c, d, x[i+12], 6 , 1700485571); + d = ii(d, a, b, c, x[i+ 3], 10, -1894986606); + c = ii(c, d, a, b, x[i+10], 15, -1051523); + b = ii(b, c, d, a, x[i+ 1], 21, -2054922799); + a = ii(a, b, c, d, x[i+ 8], 6 , 1873313359); + d = ii(d, a, b, c, x[i+15], 10, -30611744); + c = ii(c, d, a, b, x[i+ 6], 15, -1560198380); + b = ii(b, c, d, a, x[i+13], 21, 1309151649); + a = ii(a, b, c, d, x[i+ 4], 6 , -145523070); + d = ii(d, a, b, c, x[i+11], 10, -1120210379); + c = ii(c, d, a, b, x[i+ 2], 15, 718787259); + b = ii(b, c, d, a, x[i+ 9], 21, -343485551); + + a = add(a, olda); + b = add(b, oldb); + c = add(c, oldc); + d = add(d, oldd); + } + return rhex(a) + rhex(b) + rhex(c) + rhex(d); +} |