js的MD5实现-白红宇

js的MD5实现

阅读量：4568 次

发布时间：2019-06-08

本文共 8610 字，大约阅读时间需要 28 分钟。

function md5(string) {    function md5_RotateLeft(lValue, iShiftBits) {        return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));    }    function md5_AddUnsigned(lX, lY) {        var lX4, lY4, lX8, lY8, lResult;        lX8 = (lX & 0x80000000);        lY8 = (lY & 0x80000000);        lX4 = (lX & 0x40000000);        lY4 = (lY & 0x40000000);        lResult = (lX & 0x3FFFFFFF) + (lY & 0x3FFFFFFF);        if (lX4 & lY4) {            return (lResult ^ 0x80000000 ^ lX8 ^ lY8);        }        if (lX4 | lY4) {            if (lResult & 0x40000000) {                return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);            } else {                return (lResult ^ 0x40000000 ^ lX8 ^ lY8);            }        } else {            return (lResult ^ lX8 ^ lY8);        }    }    function md5_F(x, y, z) {        return (x & y) | ((~x) & z);    }    function md5_G(x, y, z) {        return (x & z) | (y & (~z));    }    function md5_H(x, y, z) {        return (x ^ y ^ z);    }    function md5_I(x, y, z) {        return (y ^ (x | (~z)));    }    function md5_FF(a, b, c, d, x, s, ac) {        a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_F(b, c, d), x), ac));        return md5_AddUnsigned(md5_RotateLeft(a, s), b);    };    function md5_GG(a, b, c, d, x, s, ac) {        a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_G(b, c, d), x), ac));        return md5_AddUnsigned(md5_RotateLeft(a, s), b);    };    function md5_HH(a, b, c, d, x, s, ac) {        a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_H(b, c, d), x), ac));        return md5_AddUnsigned(md5_RotateLeft(a, s), b);    };    function md5_II(a, b, c, d, x, s, ac) {        a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_I(b, c, d), x), ac));        return md5_AddUnsigned(md5_RotateLeft(a, s), b);    };    function md5_ConvertToWordArray(string) {        var lWordCount;        var lMessageLength = string.length;        var lNumberOfWords_temp1 = lMessageLength + 8;        var lNumberOfWords_temp2 = (lNumberOfWords_temp1 - (lNumberOfWords_temp1 % 64)) / 64;        var lNumberOfWords = (lNumberOfWords_temp2 + 1) * 16;        var lWordArray = Array(lNumberOfWords - 1);        var lBytePosition = 0;        var lByteCount = 0;        while (lByteCount < lMessageLength) {            lWordCount = (lByteCount - (lByteCount % 4)) / 4;            lBytePosition = (lByteCount % 4) * 8;            lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount) << lBytePosition));            lByteCount++;        }        lWordCount = (lByteCount - (lByteCount % 4)) / 4;        lBytePosition = (lByteCount % 4) * 8;        lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition);        lWordArray[lNumberOfWords - 2] = lMessageLength << 3;        lWordArray[lNumberOfWords - 1] = lMessageLength >>> 29;        return lWordArray;    };    function md5_WordToHex(lValue) {        var WordToHexValue = "",        WordToHexValue_temp = "",        lByte, lCount;        for (lCount = 0; lCount <= 3; lCount++) {            lByte = (lValue >>> (lCount * 8)) & 255;            WordToHexValue_temp = "0" + lByte.toString(16);            WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length - 2, 2);        }        return WordToHexValue;    };    function md5_Utf8Encode(string) {        string = string.replace(/\r\n/g, "\n");        var utftext = "";        for (var n = 0; n < string.length; n++) {            var c = string.charCodeAt(n);            if (c < 128) {                utftext += String.fromCharCode(c);            } else if ((c > 127) && (c < 2048)) {                utftext += String.fromCharCode((c >> 6) | 192);                utftext += String.fromCharCode((c & 63) | 128);            } else {                utftext += String.fromCharCode((c >> 12) | 224);                utftext += String.fromCharCode(((c >> 6) & 63) | 128);                utftext += String.fromCharCode((c & 63) | 128);            }        }        return utftext;    };    var x = Array();    var k, AA, BB, CC, DD, a, b, c, d;    var S11 = 7,    S12 = 12,    S13 = 17,    S14 = 22;    var S21 = 5,    S22 = 9,    S23 = 14,    S24 = 20;    var S31 = 4,    S32 = 11,    S33 = 16,    S34 = 23;    var S41 = 6,    S42 = 10,    S43 = 15,    S44 = 21;    string = md5_Utf8Encode(string);    x = md5_ConvertToWordArray(string);    a = 0x67452301;    b = 0xEFCDAB89;    c = 0x98BADCFE;    d = 0x10325476;    for (k = 0; k < x.length; k += 16) {        AA = a;        BB = b;        CC = c;        DD = d;        a = md5_FF(a, b, c, d, x[k + 0], S11, 0xD76AA478);        d = md5_FF(d, a, b, c, x[k + 1], S12, 0xE8C7B756);        c = md5_FF(c, d, a, b, x[k + 2], S13, 0x242070DB);        b = md5_FF(b, c, d, a, x[k + 3], S14, 0xC1BDCEEE);        a = md5_FF(a, b, c, d, x[k + 4], S11, 0xF57C0FAF);        d = md5_FF(d, a, b, c, x[k + 5], S12, 0x4787C62A);        c = md5_FF(c, d, a, b, x[k + 6], S13, 0xA8304613);        b = md5_FF(b, c, d, a, x[k + 7], S14, 0xFD469501);        a = md5_FF(a, b, c, d, x[k + 8], S11, 0x698098D8);        d = md5_FF(d, a, b, c, x[k + 9], S12, 0x8B44F7AF);        c = md5_FF(c, d, a, b, x[k + 10], S13, 0xFFFF5BB1);        b = md5_FF(b, c, d, a, x[k + 11], S14, 0x895CD7BE);        a = md5_FF(a, b, c, d, x[k + 12], S11, 0x6B901122);        d = md5_FF(d, a, b, c, x[k + 13], S12, 0xFD987193);        c = md5_FF(c, d, a, b, x[k + 14], S13, 0xA679438E);        b = md5_FF(b, c, d, a, x[k + 15], S14, 0x49B40821);        a = md5_GG(a, b, c, d, x[k + 1], S21, 0xF61E2562);        d = md5_GG(d, a, b, c, x[k + 6], S22, 0xC040B340);        c = md5_GG(c, d, a, b, x[k + 11], S23, 0x265E5A51);        b = md5_GG(b, c, d, a, x[k + 0], S24, 0xE9B6C7AA);        a = md5_GG(a, b, c, d, x[k + 5], S21, 0xD62F105D);        d = md5_GG(d, a, b, c, x[k + 10], S22, 0x2441453);        c = md5_GG(c, d, a, b, x[k + 15], S23, 0xD8A1E681);        b = md5_GG(b, c, d, a, x[k + 4], S24, 0xE7D3FBC8);        a = md5_GG(a, b, c, d, x[k + 9], S21, 0x21E1CDE6);        d = md5_GG(d, a, b, c, x[k + 14], S22, 0xC33707D6);        c = md5_GG(c, d, a, b, x[k + 3], S23, 0xF4D50D87);        b = md5_GG(b, c, d, a, x[k + 8], S24, 0x455A14ED);        a = md5_GG(a, b, c, d, x[k + 13], S21, 0xA9E3E905);        d = md5_GG(d, a, b, c, x[k + 2], S22, 0xFCEFA3F8);        c = md5_GG(c, d, a, b, x[k + 7], S23, 0x676F02D9);        b = md5_GG(b, c, d, a, x[k + 12], S24, 0x8D2A4C8A);        a = md5_HH(a, b, c, d, x[k + 5], S31, 0xFFFA3942);        d = md5_HH(d, a, b, c, x[k + 8], S32, 0x8771F681);        c = md5_HH(c, d, a, b, x[k + 11], S33, 0x6D9D6122);        b = md5_HH(b, c, d, a, x[k + 14], S34, 0xFDE5380C);        a = md5_HH(a, b, c, d, x[k + 1], S31, 0xA4BEEA44);        d = md5_HH(d, a, b, c, x[k + 4], S32, 0x4BDECFA9);        c = md5_HH(c, d, a, b, x[k + 7], S33, 0xF6BB4B60);        b = md5_HH(b, c, d, a, x[k + 10], S34, 0xBEBFBC70);        a = md5_HH(a, b, c, d, x[k + 13], S31, 0x289B7EC6);        d = md5_HH(d, a, b, c, x[k + 0], S32, 0xEAA127FA);        c = md5_HH(c, d, a, b, x[k + 3], S33, 0xD4EF3085);        b = md5_HH(b, c, d, a, x[k + 6], S34, 0x4881D05);        a = md5_HH(a, b, c, d, x[k + 9], S31, 0xD9D4D039);        d = md5_HH(d, a, b, c, x[k + 12], S32, 0xE6DB99E5);        c = md5_HH(c, d, a, b, x[k + 15], S33, 0x1FA27CF8);        b = md5_HH(b, c, d, a, x[k + 2], S34, 0xC4AC5665);        a = md5_II(a, b, c, d, x[k + 0], S41, 0xF4292244);        d = md5_II(d, a, b, c, x[k + 7], S42, 0x432AFF97);        c = md5_II(c, d, a, b, x[k + 14], S43, 0xAB9423A7);        b = md5_II(b, c, d, a, x[k + 5], S44, 0xFC93A039);        a = md5_II(a, b, c, d, x[k + 12], S41, 0x655B59C3);        d = md5_II(d, a, b, c, x[k + 3], S42, 0x8F0CCC92);        c = md5_II(c, d, a, b, x[k + 10], S43, 0xFFEFF47D);        b = md5_II(b, c, d, a, x[k + 1], S44, 0x85845DD1);        a = md5_II(a, b, c, d, x[k + 8], S41, 0x6FA87E4F);        d = md5_II(d, a, b, c, x[k + 15], S42, 0xFE2CE6E0);        c = md5_II(c, d, a, b, x[k + 6], S43, 0xA3014314);        b = md5_II(b, c, d, a, x[k + 13], S44, 0x4E0811A1);        a = md5_II(a, b, c, d, x[k + 4], S41, 0xF7537E82);        d = md5_II(d, a, b, c, x[k + 11], S42, 0xBD3AF235);        c = md5_II(c, d, a, b, x[k + 2], S43, 0x2AD7D2BB);        b = md5_II(b, c, d, a, x[k + 9], S44, 0xEB86D391);        a = md5_AddUnsigned(a, AA);        b = md5_AddUnsigned(b, BB);        c = md5_AddUnsigned(c, CC);        d = md5_AddUnsigned(d, DD);    }    return (md5_WordToHex(a) + md5_WordToHex(b) + md5_WordToHex(c) + md5_WordToHex(d)).toLowerCase();}

转载于:https://www.cnblogs.com/xiaobaizitaibai/p/11124827.html

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