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var hexcase = 1;

var b64pad = "";

var chrsz = 8;

var mode = 16; //模式选择 (16为16位的加密 32 为32位的加密)

function preprocess(form)

{

var str = "";

str += form.verifycode.value;

str = str.toUpperCase();

form.p.value = md5(md5_3(form.p.value)+str);

return true;

}

function md5_3(s)

{

var tmp = new Array;

tmp = core_md5(str2binl(s), s.length * chrsz);

tmp = core_md5(tmp, 16 * chrsz);

tmp = core_md5(tmp, 16 * chrsz);

return binl2hex(tmp);

}

function md5(s)

{

return hex_md5(s);

}

function hex_md5(s)

{

return binl2hex(core_md5(str2binl(s), s.length * chrsz));

}

function b64_md5(s)

{

return binl2b64(core_md5(str2binl(s), s.length * chrsz));

}

function str_md5(s)

{

return binl2str(core_md5(str2binl(s), s.length * chrsz));

}

function hex_hmac_md5(key, data)

{

return binl2hex(core_hmac_md5(key, data));

}

function b64_hmac_md5(key, data)

{

return binl2b64(core_hmac_md5(key, data));

}

function str_hmac_md5(key, data)

{

return binl2str(core_hmac_md5(key, data));

}

function md5_vm_test()

{

return hex_md5("abc") == "cd24fb0d6963f7d28e17f72";

}

function core_md5(x, len)

{

x[len >> 5] |= 0x80 << ((len) % 32);

x[(((len + 64) >>> 9) << 4) + 14] = len;

var a = ;

var b = - ;

var c = - ;

var d = ;

for (var i = 0; i < x.length; i += 16)

{

var olda = a;

var oldb = b;

var oldc = c;

var oldd = d;

a = md5_ff(a, b, c, d, x[i + 0], 7, - );

d = md5_ff(d, a, b, c, x[i + 1], 12, - );

c = md5_ff(c, d, a, b, x[i + 2], 17, );

b = md5_ff(b, c, d, a, x[i + 3], 22, - );

a = md5_ff(a, b, c, d, x[i + 4], 7, - );

d = md5_ff(d, a, b, c, x[i + 5], 12, );

c = md5_ff(c, d, a, b, x[i + 6], 17, - );

b = md5_ff(b, c, d, a, x[i + 7], 22, - );

a = md5_ff(a, b, c, d, x[i + 8], 7, );

d = md5_ff(d, a, b, c, x[i + 9], 12, - );

c = md5_ff(c, d, a, b, x[i + 10], 17, - 42063);

b = md5_ff(b, c, d, a, x[i + 11], 22, - );

a = md5_ff(a, b, c, d, x[i + 12], 7, );

d = md5_ff(d, a, b, c, x[i + 13], 12, - );

c = md5_ff(c, d, a, b, x[i + 14], 17, - );

b = md5_ff(b, c, d, a, x[i + 15], 22, );

a = md5_gg(a, b, c, d, x[i + 1], 5, - );

d = md5_gg(d, a, b, c, x[i + 6], 9, - );

c = md5_gg(c, d, a, b, x[i + 11], 14, );

b = md5_gg(b, c, d, a, x[i + 0], 20, - );

a = md5_gg(a, b, c, d, x[i + 5], 5, - );

d = md5_gg(d, a, b, c, x[i + 10], 9, );

c = md5_gg(c, d, a, b, x[i + 15], 14, - );

b = md5_gg(b, c, d, a, x[i + 4], 20, - );

a = md5_gg(a, b, c, d, x[i + 9], 5, );

d = md5_gg(d, a, b, c, x[i + 14], 9, - );

c = md5_gg(c, d, a, b, x[i + 3], 14, - );

b = md5_gg(b, c, d, a, x[i + 8], 20, );

a = md5_gg(a, b, c, d, x[i + 13], 5, - );

d = md5_gg(d, a, b, c, x[i + 2], 9, - );

c = md5_gg(c, d, a, b, x[i + 7], 14, );

b = md5_gg(b, c, d, a, x[i + 12], 20, - );

a = md5_hh(a, b, c, d, x[i + 5], 4, - );

d = md5_hh(d, a, b, c, x[i + 8], 11, - );

c = md5_hh(c, d, a, b, x[i + 11], 16, );

b = md5_hh(b, c, d, a, x[i + 14], 23, - );

a = md5_hh(a, b, c, d, x[i + 1], 4, - );

d = md5_hh(d, a, b, c, x[i + 4], 11, );

c = md5_hh(c, d, a, b, x[i + 7], 16, - );

b = md5_hh(b, c, d, a, x[i + 10], 23, - );

a = md5_hh(a, b, c, d, x[i + 13], 4, );

d = md5_hh(d, a, b, c, x[i + 0], 11, - );

c = md5_hh(c, d, a, b, x[i + 3], 16, - );

b = md5_hh(b, c, d, a, x[i + 6], 23, );

a = md5_hh(a, b, c, d, x[i + 9], 4, - );

d = md5_hh(d, a, b, c, x[i + 12], 11, - );

c = md5_hh(c, d, a, b, x[i + 15], 16, );

b = md5_hh(b, c, d, a, x[i + 2], 23, - );

a = md5_ii(a, b, c, d, x[i + 0], 6, - );

d = md5_ii(d, a, b, c, x[i + 7], 10, );

c = md5_ii(c, d, a, b, x[i + 14], 15, - );

b = md5_ii(b, c, d, a, x[i + 5], 21, - );

a = md5_ii(a, b, c, d, x[i + 12], 6, );

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c = md5_ii(c, d, a, b, x[i + 10], 15, - );

b = md5_ii(b, c, d, a, x[i + 1], 21, - );

a = md5_ii(a, b, c, d, x[i + 8], 6, );

d = md5_ii(d, a, b, c, x[i + 15], 10, - );

c = md5_ii(c, d, a, b, x[i + 6], 15, - );

b = md5_ii(b, c, d, a, x[i + 13], 21, );

a = md5_ii(a, b, c, d, x[i + 4], 6, - );

d = md5_ii(d, a, b, c, x[i + 11], 10, - );

c = md5_ii(c, d, a, b, x[i + 2], 15, );

b = md5_ii(b, c, d, a, x[i + 9], 21, - );

a = safe_add(a, olda);

b = safe_add(b, oldb);

c = safe_add(c, oldc);

d = safe_add(d, oldd);

}

if (mode == 16)

{

return Array(b, c);

}

else

{

return Array(a, b, c, d);

}

}

function md5_cmn(q, a, b, x, s, t)

{

return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);

}

function md5_ff(a, b, c, d, x, s, t)

{

return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);

}

function md5_gg(a, b, c, d, x, s, t)

{

return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);

}

function md5_hh(a, b, c, d, x, s, t)

{

return md5_cmn(b ^ c ^ d, a, b, x, s, t);

}

function md5_ii(a, b, c, d, x, s, t)

{

return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);

}

function core_hmac_md5(key, data)

{

var bkey = str2binl(key);

if (bkey.length > 16)

bkey = core_md5(bkey, key.length * chrsz);

var ipad = Array(16), opad = Array(16);

for (var i = 0; i < 16; i++)

{

ipad[i] = bkey[i] ^ 0x;

opad[i] = bkey[i] ^ 0x5C5C5C5C;

}

var hash = core_md5(ipad.concat(str2binl(data)), 512+data.length * chrsz);

return core_md5(opad.concat(hash), 512+128);

}

function safe_add(x, y)

var lsw = (x & 0xFFFF) + (y & 0xFFFF);

var msw = (x >> 16) + (y >> 16) + (lsw >> 16);

return (msw << 16) | (lsw & 0xFFFF);

}

function bit_rol(num, cnt)

{

return (num << cnt) | (num >>> (32-cnt));

}

function str2binl(str)

{

var bin = Array();

var mask = (1 << chrsz) - 1;

for (var i = 0; i < str.length * chrsz; i += chrsz)

bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (i % 32);

return bin;

}

function binl2str(bin)

{

var str = "";

var mask = (1 << chrsz) - 1;

for (var i = 0; i < bin.length * 32; i += chrsz)

str += String.fromCharCode((bin[i >> 5] >>> (i % 32)) & mask);

return str;

}

function binl2hex(binarray)

{

var hex_tab = hexcase ? "0ABCDEF" : "0abcdef";

var str = "";

for (var i = 0; i < binarray.length * 4; i++)

{

str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8+4)) & 0xF) +

hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF);

}

return str;

}

function binl2b64(binarray)

{

var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0+/";

var str = "";

for (var i = 0; i < binarray.length * 4; i += 3)

{

var triplet = (((binarray[i >> 2] >> 8 * (i % 4)) & 0xFF) << 16) | ((

(binarray[i + 1 >> 2] >> 8 * ((i + 1) % 4)) & 0xFF) << 8) | ((binarray[i

+ 2 >> 2] >> 8 * ((i + 2) % 4)) & 0xFF);

for (var j = 0; j < 4; j++)

{

if (i * 8+j * 6 > binarray.length * 32)

str += b64pad;

else

str += tab.charAt((triplet >> 6 * (3-j)) & 0x3F);

}

}

return str;

}

把以上代码 存为一个js 文件 这里命名为 md5.js

调用代码为 在需要使用的页面 拷入下面代码

＜script src="md5.js"＞＜/script＞

调用演示：

＜script>　　 alert(md5(""));