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| 1 | +/* |
| 2 | + * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message |
| 3 | + * Digest Algorithm, as defined in RFC 1321. |
| 4 | + * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002. |
| 5 | + * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet |
| 6 | + * Distributed under the BSD License |
| 7 | + * See http://pajhome.org.uk/crypt/md5 for more info. |
| 8 | + */ |
| 9 | + |
| 10 | +var helpers = require('./helpers'); |
| 11 | + |
| 12 | +/* |
| 13 | + * Perform a simple self-test to see if the VM is working |
| 14 | + */ |
| 15 | +function md5_vm_test() |
| 16 | +{ |
| 17 | + return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72"; |
| 18 | +} |
| 19 | + |
| 20 | +/* |
| 21 | + * Calculate the MD5 of an array of little-endian words, and a bit length |
| 22 | + */ |
| 23 | +function core_md5(x, len) |
| 24 | +{ |
| 25 | + /* append padding */ |
| 26 | + x[len >> 5] |= 0x80 << ((len) % 32); |
| 27 | + x[(((len + 64) >>> 9) << 4) + 14] = len; |
| 28 | + |
| 29 | + var a = 1732584193; |
| 30 | + var b = -271733879; |
| 31 | + var c = -1732584194; |
| 32 | + var d = 271733878; |
| 33 | + |
| 34 | + for(var i = 0; i < x.length; i += 16) |
| 35 | + { |
| 36 | + var olda = a; |
| 37 | + var oldb = b; |
| 38 | + var oldc = c; |
| 39 | + var oldd = d; |
| 40 | + |
| 41 | + a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936); |
| 42 | + d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586); |
| 43 | + c = md5_ff(c, d, a, b, x[i+ 2], 17, 606105819); |
| 44 | + b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330); |
| 45 | + a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897); |
| 46 | + d = md5_ff(d, a, b, c, x[i+ 5], 12, 1200080426); |
| 47 | + c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341); |
| 48 | + b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983); |
| 49 | + a = md5_ff(a, b, c, d, x[i+ 8], 7 , 1770035416); |
| 50 | + d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417); |
| 51 | + c = md5_ff(c, d, a, b, x[i+10], 17, -42063); |
| 52 | + b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162); |
| 53 | + a = md5_ff(a, b, c, d, x[i+12], 7 , 1804603682); |
| 54 | + d = md5_ff(d, a, b, c, x[i+13], 12, -40341101); |
| 55 | + c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290); |
| 56 | + b = md5_ff(b, c, d, a, x[i+15], 22, 1236535329); |
| 57 | + |
| 58 | + a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510); |
| 59 | + d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632); |
| 60 | + c = md5_gg(c, d, a, b, x[i+11], 14, 643717713); |
| 61 | + b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302); |
| 62 | + a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691); |
| 63 | + d = md5_gg(d, a, b, c, x[i+10], 9 , 38016083); |
| 64 | + c = md5_gg(c, d, a, b, x[i+15], 14, -660478335); |
| 65 | + b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848); |
| 66 | + a = md5_gg(a, b, c, d, x[i+ 9], 5 , 568446438); |
| 67 | + d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690); |
| 68 | + c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961); |
| 69 | + b = md5_gg(b, c, d, a, x[i+ 8], 20, 1163531501); |
| 70 | + a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467); |
| 71 | + d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784); |
| 72 | + c = md5_gg(c, d, a, b, x[i+ 7], 14, 1735328473); |
| 73 | + b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734); |
| 74 | + |
| 75 | + a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558); |
| 76 | + d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463); |
| 77 | + c = md5_hh(c, d, a, b, x[i+11], 16, 1839030562); |
| 78 | + b = md5_hh(b, c, d, a, x[i+14], 23, -35309556); |
| 79 | + a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060); |
| 80 | + d = md5_hh(d, a, b, c, x[i+ 4], 11, 1272893353); |
| 81 | + c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632); |
| 82 | + b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640); |
| 83 | + a = md5_hh(a, b, c, d, x[i+13], 4 , 681279174); |
| 84 | + d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222); |
| 85 | + c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979); |
| 86 | + b = md5_hh(b, c, d, a, x[i+ 6], 23, 76029189); |
| 87 | + a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487); |
| 88 | + d = md5_hh(d, a, b, c, x[i+12], 11, -421815835); |
| 89 | + c = md5_hh(c, d, a, b, x[i+15], 16, 530742520); |
| 90 | + b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651); |
| 91 | + |
| 92 | + a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844); |
| 93 | + d = md5_ii(d, a, b, c, x[i+ 7], 10, 1126891415); |
| 94 | + c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905); |
| 95 | + b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055); |
| 96 | + a = md5_ii(a, b, c, d, x[i+12], 6 , 1700485571); |
| 97 | + d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606); |
| 98 | + c = md5_ii(c, d, a, b, x[i+10], 15, -1051523); |
| 99 | + b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799); |
| 100 | + a = md5_ii(a, b, c, d, x[i+ 8], 6 , 1873313359); |
| 101 | + d = md5_ii(d, a, b, c, x[i+15], 10, -30611744); |
| 102 | + c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380); |
| 103 | + b = md5_ii(b, c, d, a, x[i+13], 21, 1309151649); |
| 104 | + a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070); |
| 105 | + d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379); |
| 106 | + c = md5_ii(c, d, a, b, x[i+ 2], 15, 718787259); |
| 107 | + b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551); |
| 108 | + |
| 109 | + a = safe_add(a, olda); |
| 110 | + b = safe_add(b, oldb); |
| 111 | + c = safe_add(c, oldc); |
| 112 | + d = safe_add(d, oldd); |
| 113 | + } |
| 114 | + return Array(a, b, c, d); |
| 115 | + |
| 116 | +} |
| 117 | + |
| 118 | +/* |
| 119 | + * These functions implement the four basic operations the algorithm uses. |
| 120 | + */ |
| 121 | +function md5_cmn(q, a, b, x, s, t) |
| 122 | +{ |
| 123 | + return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b); |
| 124 | +} |
| 125 | +function md5_ff(a, b, c, d, x, s, t) |
| 126 | +{ |
| 127 | + return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t); |
| 128 | +} |
| 129 | +function md5_gg(a, b, c, d, x, s, t) |
| 130 | +{ |
| 131 | + return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t); |
| 132 | +} |
| 133 | +function md5_hh(a, b, c, d, x, s, t) |
| 134 | +{ |
| 135 | + return md5_cmn(b ^ c ^ d, a, b, x, s, t); |
| 136 | +} |
| 137 | +function md5_ii(a, b, c, d, x, s, t) |
| 138 | +{ |
| 139 | + return md5_cmn(c ^ (b | (~d)), a, b, x, s, t); |
| 140 | +} |
| 141 | + |
| 142 | +/* |
| 143 | + * Add integers, wrapping at 2^32. This uses 16-bit operations internally |
| 144 | + * to work around bugs in some JS interpreters. |
| 145 | + */ |
| 146 | +function safe_add(x, y) |
| 147 | +{ |
| 148 | + var lsw = (x & 0xFFFF) + (y & 0xFFFF); |
| 149 | + var msw = (x >> 16) + (y >> 16) + (lsw >> 16); |
| 150 | + return (msw << 16) | (lsw & 0xFFFF); |
| 151 | +} |
| 152 | + |
| 153 | +/* |
| 154 | + * Bitwise rotate a 32-bit number to the left. |
| 155 | + */ |
| 156 | +function bit_rol(num, cnt) |
| 157 | +{ |
| 158 | + return (num << cnt) | (num >>> (32 - cnt)); |
| 159 | +} |
| 160 | + |
| 161 | +module.exports = function md5(buf) { |
| 162 | + return helpers.hash(buf, core_md5, 16); |
| 163 | +}; |
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