这两天碰到了两个MD5加密的js逆向，一个是猿人学第一题，还有一个就是在工作中。 然后发现了些规律，一般MD5加密之后的字符串是32位,也有16位，这基本都知道
但是在MD5加密的js代码中也有一些规律。 这是我昨天在猿人学里面获取到的MD5加密代码
代码语言：javascript复制var hexcase = 0;
var b64pad = "";
var chrsz = 16;
function hex_md5(a) {
return binl2hex(core_md5(str2binl(a), a.length * chrsz))
}
function b64_md5(a) {
return binl2b64(core_md5(str2binl(a), a.length * chrsz))
}
function str_md5(a) {
return binl2str(core_md5(str2binl(a), a.length * chrsz))
}
function hex_hmac_md5(a, b) {
return binl2hex(core_hmac_md5(a, b))
}
function b64_hmac_md5(a, b) {
return binl2b64(core_hmac_md5(a, b))
}
function str_hmac_md5(a, b) {
return binl2str(core_hmac_md5(a, b))
}
function md5_vm_test() {
return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72"
}
function core_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, -680976936);
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, 1804660682);
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, -1921207734);
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, -722881979);
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, 11261161415);
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, -1894446606);
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 core_hmac_md5(c, f) {
var e = str2binl(c);
if (e.length > 16) {
e = core_md5(e, c.length * chrsz)
}
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 = core_md5(a.concat(str2binl(f)), 512 f.length * chrsz);
return core_md5(d.concat(g), 512 128)
}
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))
}
function str2binl(d) {
var c = Array();
var a = (1 << chrsz) - 1;
for (var b = 0; b < d.length * chrsz; b = chrsz) {
c[b >> 5] |= (d.charCodeAt(b / chrsz) & a) << (b % 32)
}
return c
}
function binl2str(c) {
var d = "";
var a = (1 << chrsz) - 1;
for (var b = 0; b < c.length * 32; b = chrsz) {
d = String.fromCharCode((c[b >> 5] >>> (b % 32)) & a)
}
return d
}
function binl2hex(c) {
var b = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
var d = "";
for (var a = 0; a < c.length * 4; a ) {
d = b.charAt((c[a >> 2] >> ((a % 4) * 8 4)) & 15) b.charAt((c[a >> 2] >> ((a % 4) * 8)) & 15)
}
return d
}
function binl2b64(d) {
var c = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 /";
var f = "";
for (var b = 0; b < d.length * 4; b = 3) {
var e = (((d[b >> 2] >> 8 * (b % 4)) & 255) << 16) | (((d[b 1 >> 2] >> 8 * ((b 1) % 4)) & 255) << 8) | ((d[b 2 >> 2] >> 8 * ((b 2) % 4)) & 255);
for (var a = 0; a < 4; a ) {
if (b * 8 a * 6 > d.length * 32) {
f = b64pad
} else {
f = c.charAt((e >> 6 * (3 - a)) & 63)
}
}
}
return f
};
window.f = hex_md5(mwqqppz)然后这是今天我发现的一个MD5加密代码
代码语言：javascript复制define("sc-list/m/compare-full-layout/src/js/md5.js", [], function(require, e, t) {
t.exports = function() {
var e = 0;
var t = "";
var i = 8;
function a(e) {
return w(u(y(e), e.length * i))
}
function s(e) {
return x(u(y(e), e.length * i))
}
function n(e) {
return _(u(y(e), e.length * i))
}
function r(e, t) {
return w(g(e, t))
}
function o(e, t) {
return x(g(e, t))
}
function l(e, t) {
return _(g(e, t))
}
function c() {
return a("abc") == "900150983cd24fb0d6963f7d28e17f72"
}
function u(e, t) {
e[t >> 5] |= 128 << t % 32;
e[(t 64 >>> 9 << 4) 14] = t;
var i = 1732584193;
var a = -271733879;
var s = -1732584194;
var n = 271733878;
for (var r = 0; r < e.length; r = 16) {
var o = i;
var l = a;
var c = s;
var u = n;
i = h(i, a, s, n, e[r 0], 7, -680876936);
n = h(n, i, a, s, e[r 1], 12, -389564586);
s = h(s, n, i, a, e[r 2], 17, 606105819);
a = h(a, s, n, i, e[r 3], 22, -1044525330);
i = h(i, a, s, n, e[r 4], 7, -176418897);
n = h(n, i, a, s, e[r 5], 12, 1200080426);
s = h(s, n, i, a, e[r 6], 17, -1473231341);
a = h(a, s, n, i, e[r 7], 22, -45705983);
i = h(i, a, s, n, e[r 8], 7, 1770035416);
n = h(n, i, a, s, e[r 9], 12, -1958414417);
s = h(s, n, i, a, e[r 10], 17, -42063);
a = h(a, s, n, i, e[r 11], 22, -1990404162);
i = h(i, a, s, n, e[r 12], 7, 1804603682);
n = h(n, i, a, s, e[r 13], 12, -40341101);
s = h(s, n, i, a, e[r 14], 17, -1502002290);
a = h(a, s, n, i, e[r 15], 22, 1236535329);
i = p(i, a, s, n, e[r 1], 5, -165796510);
n = p(n, i, a, s, e[r 6], 9, -1069501632);
s = p(s, n, i, a, e[r 11], 14, 643717713);
a = p(a, s, n, i, e[r 0], 20, -373897302);
i = p(i, a, s, n, e[r 5], 5, -701558691);
n = p(n, i, a, s, e[r 10], 9, 38016083);
s = p(s, n, i, a, e[r 15], 14, -660478335);
a = p(a, s, n, i, e[r 4], 20, -405537848);
i = p(i, a, s, n, e[r 9], 5, 568446438);
n = p(n, i, a, s, e[r 14], 9, -1019803690);
s = p(s, n, i, a, e[r 3], 14, -187363961);
a = p(a, s, n, i, e[r 8], 20, 1163531501);
i = p(i, a, s, n, e[r 13], 5, -1444681467);
n = p(n, i, a, s, e[r 2], 9, -51403784);
s = p(s, n, i, a, e[r 7], 14, 1735328473);
a = p(a, s, n, i, e[r 12], 20, -1926607734);
i = f(i, a, s, n, e[r 5], 4, -378558);
n = f(n, i, a, s, e[r 8], 11, -2022574463);
s = f(s, n, i, a, e[r 11], 16, 1839030562);
a = f(a, s, n, i, e[r 14], 23, -35309556);
i = f(i, a, s, n, e[r 1], 4, -1530992060);
n = f(n, i, a, s, e[r 4], 11, 1272893353);
s = f(s, n, i, a, e[r 7], 16, -155497632);
a = f(a, s, n, i, e[r 10], 23, -1094730640);
i = f(i, a, s, n, e[r 13], 4, 681279174);
n = f(n, i, a, s, e[r 0], 11, -358537222);
s = f(s, n, i, a, e[r 3], 16, -722521979);
a = f(a, s, n, i, e[r 6], 23, 76029189);
i = f(i, a, s, n, e[r 9], 4, -640364487);
n = f(n, i, a, s, e[r 12], 11, -421815835);
s = f(s, n, i, a, e[r 15], 16, 530742520);
a = f(a, s, n, i, e[r 2], 23, -995338651);
i = m(i, a, s, n, e[r 0], 6, -198630844);
n = m(n, i, a, s, e[r 7], 10, 1126891415);
s = m(s, n, i, a, e[r 14], 15, -1416354905);
a = m(a, s, n, i, e[r 5], 21, -57434055);
i = m(i, a, s, n, e[r 12], 6, 1700485571);
n = m(n, i, a, s, e[r 3], 10, -1894986606);
s = m(s, n, i, a, e[r 10], 15, -1051523);
a = m(a, s, n, i, e[r 1], 21, -2054922799);
i = m(i, a, s, n, e[r 8], 6, 1873313359);
n = m(n, i, a, s, e[r 15], 10, -30611744);
s = m(s, n, i, a, e[r 6], 15, -1560198380);
a = m(a, s, n, i, e[r 13], 21, 1309151649);
i = m(i, a, s, n, e[r 4], 6, -145523070);
n = m(n, i, a, s, e[r 11], 10, -1120210379);
s = m(s, n, i, a, e[r 2], 15, 718787259);
a = m(a, s, n, i, e[r 9], 21, -343485551);
i = v(i, o);
a = v(a, l);
s = v(s, c);
n = v(n, u)
}
return Array(i, a, s, n)
}
function d(e, t, i, a, s, n) {
return v(b(v(v(t, e), v(a, n)), s), i)
}
function h(e, t, i, a, s, n, r) {
return d(t & i | ~t & a, e, t, s, n, r)
}
function p(e, t, i, a, s, n, r) {
return d(t & a | i & ~a, e, t, s, n, r)
}
function f(e, t, i, a, s, n, r) {
return d(t ^ i ^ a, e, t, s, n, r)
}
function m(e, t, i, a, s, n, r) {
return d(i ^ (t | ~a), e, t, s, n, r)
}
function g(e, t) {
var a = y(e);
if (a.length > 16)
a = u(a, e.length * i);
var s = Array(16)
, n = Array(16);
for (var r = 0; r < 16; r ) {
s[r] = a[r] ^ 909522486;
n[r] = a[r] ^ 1549556828
}
var o = u(s.concat(y(t)), 512 t.length * i);
return u(n.concat(o), 512 128)
}
function v(e, t) {
var i = (e & 65535) (t & 65535);
var a = (e >> 16) (t >> 16) (i >> 16);
return a << 16 | i & 65535
}
function b(e, t) {
return e << t | e >>> 32 - t
}
function y(e) {
var t = Array();
var a = (1 << i) - 1;
for (var s = 0; s < e.length * i; s = i)
t[s >> 5] |= (e.charCodeAt(s / i) & a) << s % 32;
return t
}
function _(e) {
var t = "";
var a = (1 << i) - 1;
for (var s = 0; s < e.length * 32; s = i)
t = String.fromCharCode(e[s >> 5] >>> s % 32 & a);
return t
}
function w(t) {
var i = e ? "0123456789ABCDEF" : "0123456789abcdef";
var a = "";
for (var s = 0; s < t.length * 4; s ) {
a = i.charAt(t[s >> 2] >> s % 4 * 8 4 & 15) i.charAt(t[s >> 2] >> s % 4 * 8 & 15)
}
return a
}
function x(e) {
var i = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 /";
var a = "";
for (var s = 0; s < e.length * 4; s = 3) {
var n = (e[s >> 2] >> 8 * (s % 4) & 255) << 16 | (e[s 1 >> 2] >> 8 * ((s 1) % 4) & 255) << 8 | e[s 2 >> 2] >> 8 * ((s 2) % 4) & 255;
for (var r = 0; r < 4; r ) {
if (s * 8 r * 6 > e.length * 32)
a = t;
else
a = i.charAt(n >> 6 * (3 - r) & 63)
}
}
return a
}
return a
}()
});且不看第一行，毕竟第一行直接表示他引用了MD5加密了。。。 一对比发现，里面除了变量名改了一下，不能说很像，只能说一模一样。 比如都有一个验证md5的
代码语言：javascript复制function md5_vm_test() {
return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72"
}abc都一样。。。 感觉大概看一下，基本上以后看到MD5都能发现了
