一个JS版本的MD5

浏览数：20 / 时间：2015年06月09日

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var 
hexcase = 0;
function 
hex_md5(a) {
    if 
(a == "") return 
a;
    return 
rstr2hex(rstr_md5(str2rstr_utf8(a)))
}
function 
hex_hmac_md5(a, b) {
    return 
rstr2hex(rstr_hmac_md5(str2rstr_utf8(a), str2rstr_utf8(b)))
}
function 
md5_vm_test() {
    return 
hex_md5("abc").toLowerCase() == "900150983cd24fb0d6963f7d28e17f72"
}
function 
rstr_md5(a) {
    return 
binl2rstr(binl_md5(rstr2binl(a), a.length * 8))
}
function 
rstr_hmac_md5(c, f) {
    var 
e = rstr2binl(c);
    if 
(e.length > 16) {
        e = binl_md5(e, c.length * 8)
    }
    var 
a = Array(16),
    d = Array(16);
    for 
(var 
b = 0; b < 16; b++) {
        a[b] = e[b] ^ 909522486;
        d[b] = e[b] ^ 1549556828
    }
    var 
g = binl_md5(a.concat(rstr2binl(f)), 512 + f.length * 8);
    return 
binl2rstr(binl_md5(d.concat(g), 512 + 128))
}
function 
rstr2hex(c) {
    try 
{
        hexcase
    } catch(g) {
        hexcase = 0
    }
    var 
f = hexcase ? "0123456789ABCDEF": "0123456789abcdef";
    var 
b = "";
    var 
a;
    for 
(var 
d = 0; d < c.length; d++) {
        a = c.charCodeAt(d);
        b += f.charAt((a >>> 4) & 15) + f.charAt(a & 15)
    }
    return 
b
}
function 
str2rstr_utf8(c) {
    var 
b = "";
    var 
d = -1;
    var 
a, e;
    while 
(++d < c.length) {
        a = c.charCodeAt(d);
        e = d + 1 < c.length ? c.charCodeAt(d + 1) : 0;
        if 
(55296 <= a && a <= 56319 && 56320 <= e && e <= 57343) {
            a = 65536 + ((a & 1023) << 10) + (e & 1023);
            d++
        }
        if 
(a <= 127) {
            b += String.fromCharCode(a)
        } else 
{
            if 
(a <= 2047) {
                b += String.fromCharCode(192 | ((a >>> 6) & 31), 128 | (a & 63))
            } else 
{
                if 
(a <= 65535) {
                    b += String.fromCharCode(224 | ((a >>> 12) & 15), 128 | ((a >>> 6) & 63), 128 | (a & 63))
                } else 
{
                    if 
(a <= 2097151) {
                        b += String.fromCharCode(240 | ((a >>> 18) & 7), 128 | ((a >>> 12) & 63), 128 | ((a >>> 6) & 63), 128 | (a & 63))
                    }
                }
            }
        }
    }
    return 
b
}
function 
rstr2binl(b) {
    var 
a = Array(b.length >> 2);
    for 
(var 
c = 0; c < a.length; c++) {
        a[c] = 0
    }
    for 
(var 
c = 0; c < b.length * 8; c += 8) {
        a[c >> 5] |= (b.charCodeAt(c / 8) & 255) << (c % 32)
    }
    return 
a
}
function 
binl2rstr(b) {
    var 
a = "";
    for 
(var 
c = 0; c < b.length * 32; c += 8) {
        a += String.fromCharCode((b[c >> 5] >>> (c % 32)) & 255)
    }
    return 
a
}
function 
binl_md5(p, k) {
    p[k >> 5] |= 128 << ((k) % 32);
    p[(((k + 64) >>> 9) << 4) + 14] = k;
    var 
o = 1732584193;
    var 
n = -271733879;
    var 
m = -1732584194;
    var 
l = 271733878;
    for 
(var 
g = 0; g < p.length; g += 16) {
        var 
j = o;
        var 
h = n;
        var 
f = m;
        var 
e = l;
        o = md5_ff(o, n, m, l, p[g + 0], 7, -680876936);
        l = md5_ff(l, o, n, m, p[g + 1], 12, -389564586);
        m = md5_ff(m, l, o, n, p[g + 2], 17, 606105819);
        n = md5_ff(n, m, l, o, p[g + 3], 22, -1044525330);
        o = md5_ff(o, n, m, l, p[g + 4], 7, -176418897);
        l = md5_ff(l, o, n, m, p[g + 5], 12, 1200080426);
        m = md5_ff(m, l, o, n, p[g + 6], 17, -1473231341);
        n = md5_ff(n, m, l, o, p[g + 7], 22, -45705983);
        o = md5_ff(o, n, m, l, p[g + 8], 7, 1770035416);
        l = md5_ff(l, o, n, m, p[g + 9], 12, -1958414417);
        m = md5_ff(m, l, o, n, p[g + 10], 17, -42063);
        n = md5_ff(n, m, l, o, p[g + 11], 22, -1990404162);
        o = md5_ff(o, n, m, l, p[g + 12], 7, 1804603682);
        l = md5_ff(l, o, n, m, p[g + 13], 12, -40341101);
        m = md5_ff(m, l, o, n, p[g + 14], 17, -1502002290);
        n = md5_ff(n, m, l, o, p[g + 15], 22, 1236535329);
        o = md5_gg(o, n, m, l, p[g + 1], 5, -165796510);
        l = md5_gg(l, o, n, m, p[g + 6], 9, -1069501632);
        m = md5_gg(m, l, o, n, p[g + 11], 14, 643717713);
        n = md5_gg(n, m, l, o, p[g + 0], 20, -373897302);
        o = md5_gg(o, n, m, l, p[g + 5], 5, -701558691);
        l = md5_gg(l, o, n, m, p[g + 10], 9, 38016083);
        m = md5_gg(m, l, o, n, p[g + 15], 14, -660478335);
        n = md5_gg(n, m, l, o, p[g + 4], 20, -405537848);
        o = md5_gg(o, n, m, l, p[g + 9], 5, 568446438);
        l = md5_gg(l, o, n, m, p[g + 14], 9, -1019803690);
        m = md5_gg(m, l, o, n, p[g + 3], 14, -187363961);
        n = md5_gg(n, m, l, o, p[g + 8], 20, 1163531501);
        o = md5_gg(o, n, m, l, p[g + 13], 5, -1444681467);
        l = md5_gg(l, o, n, m, p[g + 2], 9, -51403784);
        m = md5_gg(m, l, o, n, p[g + 7], 14, 1735328473);
        n = md5_gg(n, m, l, o, p[g + 12], 20, -1926607734);
        o = md5_hh(o, n, m, l, p[g + 5], 4, -378558);
        l = md5_hh(l, o, n, m, p[g + 8], 11, -2022574463);
        m = md5_hh(m, l, o, n, p[g + 11], 16, 1839030562);
        n = md5_hh(n, m, l, o, p[g + 14], 23, -35309556);
        o = md5_hh(o, n, m, l, p[g + 1], 4, -1530992060);
        l = md5_hh(l, o, n, m, p[g + 4], 11, 1272893353);
        m = md5_hh(m, l, o, n, p[g + 7], 16, -155497632);
        n = md5_hh(n, m, l, o, p[g + 10], 23, -1094730640);
        o = md5_hh(o, n, m, l, p[g + 13], 4, 681279174);
        l = md5_hh(l, o, n, m, p[g + 0], 11, -358537222);
        m = md5_hh(m, l, o, n, p[g + 3], 16, -722521979);
        n = md5_hh(n, m, l, o, p[g + 6], 23, 76029189);
        o = md5_hh(o, n, m, l, p[g + 9], 4, -640364487);
        l = md5_hh(l, o, n, m, p[g + 12], 11, -421815835);
        m = md5_hh(m, l, o, n, p[g + 15], 16, 530742520);
        n = md5_hh(n, m, l, o, p[g + 2], 23, -995338651);
        o = md5_ii(o, n, m, l, p[g + 0], 6, -198630844);
        l = md5_ii(l, o, n, m, p[g + 7], 10, 1126891415);
        m = md5_ii(m, l, o, n, p[g + 14], 15, -1416354905);
        n = md5_ii(n, m, l, o, p[g + 5], 21, -57434055);
        o = md5_ii(o, n, m, l, p[g + 12], 6, 1700485571);
        l = md5_ii(l, o, n, m, p[g + 3], 10, -1894986606);
        m = md5_ii(m, l, o, n, p[g + 10], 15, -1051523);
        n = md5_ii(n, m, l, o, p[g + 1], 21, -2054922799);
        o = md5_ii(o, n, m, l, p[g + 8], 6, 1873313359);
        l = md5_ii(l, o, n, m, p[g + 15], 10, -30611744);
        m = md5_ii(m, l, o, n, p[g + 6], 15, -1560198380);
        n = md5_ii(n, m, l, o, p[g + 13], 21, 1309151649);
        o = md5_ii(o, n, m, l, p[g + 4], 6, -145523070);
        l = md5_ii(l, o, n, m, p[g + 11], 10, -1120210379);
        m = md5_ii(m, l, o, n, p[g + 2], 15, 718787259);
        n = md5_ii(n, m, l, o, p[g + 9], 21, -343485551);
        o = safe_add(o, j);
        n = safe_add(n, h);
        m = safe_add(m, f);
        l = safe_add(l, e)
    }
    return 
Array(o, n, m, l)
}
function 
md5_cmn(h, e, d, c, g, f) {
    return 
safe_add(bit_rol(safe_add(safe_add(e, h), safe_add(c, f)), g), d)
}
function 
md5_ff(g, f, k, j, e, i, h) {
    return 
md5_cmn((f & k) | ((~f) & j), g, f, e, i, h)
}
function 
md5_gg(g, f, k, j, e, i, h) {
    return 
md5_cmn((f & j) | (k & (~j)), g, f, e, i, h)
}
function 
md5_hh(g, f, k, j, e, i, h) {
    return 
md5_cmn(f ^ k ^ j, g, f, e, i, h)
}
function 
md5_ii(g, f, k, j, e, i, h) {
    return 
md5_cmn(k ^ (f | (~j)), g, f, e, i, h)
}
function 
safe_add(a, d) {
    var 
c = (a & 65535) + (d & 65535);
    var 
b = (a >> 16) + (d >> 16) + (c >> 16);
    return 
(b << 16) | (c & 65535)
}
function 
bit_rol(a, b) {
    return 
(a << b) | (a >>> (32 - b))
}
 
 /**
 * md5
 * use : var pwd=hex_md5(pwd)
 */