JavaScript Attacks
程序员文章站
2022-06-02 14:12:17
...
前言
JS攻击, 即JavaScript Attacks, 攻击者利用JavaScript实施攻击。
下面对四种不同等级的js攻击进行分析:
-
Low
服务端核心代码:
<?php
$page[ 'body' ] .= <<<EOF
<script>
/*
MD5 code from here
https://github.com/blueimp/JavaScript-MD5
*/
!function(n){"use strict";function t(n,t){var r=(65535&n)+(65535&t);return(n>>16)+(t>>16)+(r>>16)<<16|65535&r}function r(n,t){return n<<t|n>>>32-t}function e(n,e,o,u,c,f){return t(r(t(t(e,n),t(u,f)),c),o)}function o(n,t,r,o,u,c,f){return e(t&r|~t&o,n,t,u,c,f)}function u(n,t,r,o,u,c,f){return e(t&o|r&~o,n,t,u,c,f)}function c(n,t,r,o,u,c,f){return e(t^r^o,n,t,u,c,f)}function f(n,t,r,o,u,c,f){return e(r^(t|~o),n,t,u,c,f)}function i(n,r){n[r>>5]|=128<<r%32,n[14+(r+64>>>9<<4)]=r;var e,i,a,d,h,l=1732584193,g=-271733879,v=-1732584194,m=271733878;for(e=0;e<n.length;e+=16)i=l,a=g,d=v,h=m,g=f(g=f(g=f(g=f(g=c(g=c(g=c(g=c(g=u(g=u(g=u(g=u(g=o(g=o(g=o(g=o(g,v=o(v,m=o(m,l=o(l,g,v,m,n[e],7,-680876936),g,v,n[e+1],12,-389564586),l,g,n[e+2],17,606105819),m,l,n[e+3],22,-1044525330),v=o(v,m=o(m,l=o(l,g,v,m,n[e+4],7,-176418897),g,v,n[e+5],12,1200080426),l,g,n[e+6],17,-1473231341),m,l,n[e+7],22,-45705983),v=o(v,m=o(m,l=o(l,g,v,m,n[e+8],7,1770035416),g,v,n[e+9],12,-1958414417),l,g,n[e+10],17,-42063),m,l,n[e+11],22,-1990404162),v=o(v,m=o(m,l=o(l,g,v,m,n[e+12],7,1804603682),g,v,n[e+13],12,-40341101),l,g,n[e+14],17,-1502002290),m,l,n[e+15],22,1236535329),v=u(v,m=u(m,l=u(l,g,v,m,n[e+1],5,-165796510),g,v,n[e+6],9,-1069501632),l,g,n[e+11],14,643717713),m,l,n[e],20,-373897302),v=u(v,m=u(m,l=u(l,g,v,m,n[e+5],5,-701558691),g,v,n[e+10],9,38016083),l,g,n[e+15],14,-660478335),m,l,n[e+4],20,-405537848),v=u(v,m=u(m,l=u(l,g,v,m,n[e+9],5,568446438),g,v,n[e+14],9,-1019803690),l,g,n[e+3],14,-187363961),m,l,n[e+8],20,1163531501),v=u(v,m=u(m,l=u(l,g,v,m,n[e+13],5,-1444681467),g,v,n[e+2],9,-51403784),l,g,n[e+7],14,1735328473),m,l,n[e+12],20,-1926607734),v=c(v,m=c(m,l=c(l,g,v,m,n[e+5],4,-378558),g,v,n[e+8],11,-2022574463),l,g,n[e+11],16,1839030562),m,l,n[e+14],23,-35309556),v=c(v,m=c(m,l=c(l,g,v,m,n[e+1],4,-1530992060),g,v,n[e+4],11,1272893353),l,g,n[e+7],16,-155497632),m,l,n[e+10],23,-1094730640),v=c(v,m=c(m,l=c(l,g,v,m,n[e+13],4,681279174),g,v,n[e],11,-358537222),l,g,n[e+3],16,-722521979),m,l,n[e+6],23,76029189),v=c(v,m=c(m,l=c(l,g,v,m,n[e+9],4,-640364487),g,v,n[e+12],11,-421815835),l,g,n[e+15],16,530742520),m,l,n[e+2],23,-995338651),v=f(v,m=f(m,l=f(l,g,v,m,n[e],6,-198630844),g,v,n[e+7],10,1126891415),l,g,n[e+14],15,-1416354905),m,l,n[e+5],21,-57434055),v=f(v,m=f(m,l=f(l,g,v,m,n[e+12],6,1700485571),g,v,n[e+3],10,-1894986606),l,g,n[e+10],15,-1051523),m,l,n[e+1],21,-2054922799),v=f(v,m=f(m,l=f(l,g,v,m,n[e+8],6,1873313359),g,v,n[e+15],10,-30611744),l,g,n[e+6],15,-1560198380),m,l,n[e+13],21,1309151649),v=f(v,m=f(m,l=f(l,g,v,m,n[e+4],6,-145523070),g,v,n[e+11],10,-1120210379),l,g,n[e+2],15,718787259),m,l,n[e+9],21,-343485551),l=t(l,i),g=t(g,a),v=t(v,d),m=t(m,h);return[l,g,v,m]}function a(n){var t,r="",e=32*n.length;for(t=0;t<e;t+=8)r+=String.fromCharCode(n[t>>5]>>>t%32&255);return r}function d(n){var t,r=[];for(r[(n.length>>2)-1]=void 0,t=0;t<r.length;t+=1)r[t]=0;var e=8*n.length;for(t=0;t<e;t+=8)r[t>>5]|=(255&n.charCodeAt(t/8))<<t%32;return r}function h(n){return a(i(d(n),8*n.length))}function l(n,t){var r,e,o=d(n),u=[],c=[];for(u[15]=c[15]=void 0,o.length>16&&(o=i(o,8*n.length)),r=0;r<16;r+=1)u[r]=909522486^o[r],c[r]=1549556828^o[r];return e=i(u.concat(d(t)),512+8*t.length),a(i(c.concat(e),640))}function g(n){var t,r,e="";for(r=0;r<n.length;r+=1)t=n.charCodeAt(r),e+="0123456789abcdef".charAt(t>>>4&15)+"0123456789abcdef".charAt(15&t);return e}function v(n){return unescape(encodeURIComponent(n))}function m(n){return h(v(n))}function p(n){return g(m(n))}function s(n,t){return l(v(n),v(t))}function C(n,t){return g(s(n,t))}function A(n,t,r){return t?r?s(t,n):C(t,n):r?m(n):p(n)}"function"==typeof define&&define.amd?define(function(){return A}):"object"==typeof module&&module.exports?module.exports=A:n.md5=A}(this);
function rot13(inp) {
return inp.replace(/[a-zA-Z]/g,function(c){return String.fromCharCode((c<="Z"?90:122)>=(c=c.charCodeAt(0)+13)?c:c-26);});
}
function generate_token() {
var phrase = document.getElementById("phrase").value;
document.getElementById("token").value = md5(rot13(phrase));
}
generate_token();
</script>
EOF;
?>服务端对输入的Phrase内容处理过程:
1. 先用 rot13() 函数进行ascii码转换;
2. 调用 generate_token() 函数进行md5加密 (加密算法来自github)
然后将加密后的值赋值给token值。
漏洞利用
光看服务端代码是没什么问题的, 但是结合前段代码可以看到:
前段要求我们输入success就赢了, 我们输入再submit, 发现不对:
那么问题来了，到底是怎么回事?
首先, 我们可以看到, POST的token参数值在前端网页中是固定的:
然后再看看网页的index.html代码:
可以看到, 当输入的值是success就对其进行加密处理：(和服务端的处理一致)
１．str_rot13()函数转换字符为ascii码
2． md5函数加密
然后直接用网页中固定的token值与加密后的success比较 (结果肯定是不相等的)
总的来说, 我们需要将token值取success进行同样md5加密后的值。
刚好服务端的代码是在网页代码index.html中的:
所以, 我们可以直接在控制台中调用index.html中的generate_token()函数, 将即将post的token改为success进行同样md5加密后的值。
先在phrase中输入: success;
然后再在控制台中调用generate_token()函数:
submit之后即可:
-
Medium
服务端核心代码:
<?php
$page[ 'body' ] .= <<<EOF
<script src="/DVWA/vulnerabilities/javascript/source/medium.js"></script>
EOF;
?>服务端把锅甩给了medium.js:
function do_something(e) {
for (var t = "", n = e.length - 1; n >= 0; n--) t += e[n];
return t
}
setTimeout(function () {
do_elsesomething("XX")
}, 300);
function do_elsesomething(e) {
document.getElementById("token").value = do_something(e + document.getElementById("phrase").value + "XX")
}
- do_something() 函数:
进行某种方法的加密。
- do_elsesomething() 函数:
假设令phrase的值为str, 那么该函数的作用就是将 XX($str)XX 用 do_something()进行加密, 并赋值给token。
漏洞利用
和Low级别的漏油一样的原理, 只是加密函数换了而已。
可以看到, token的值是固定为: XXeMegnahCXX
我们可以看到前端有 medium.js代码, 所以先在phrase输入success, 然后直接在控制台调用函数就可以了:
-
High
服务端核心代码:
<?php
$page[ 'body' ] .= <<<EOF
<script src="/DVWA/vulnerabilities/javascript/source/high.js"></script>
EOF;
?>
与Medium级别一样, 继续把锅甩给high.js:
var a=['fromCharCode','toString','replace','BeJ','\x5cw+','Lyg','SuR','(w(){\x273M\x203L\x27;q\x201l=\x273K\x203I\x203J\x20T\x27;q\x201R=1c\x202I===\x271n\x27;q\x20Y=1R?2I:{};p(Y.3N){1R=1O}q\x202L=!1R&&1c\x202M===\x271n\x27;q\x202o=!Y.2S&&1c\x202d===\x271n\x27&&2d.2Q&&2d.2Q.3S;p(2o){Y=3R}z\x20p(2L){Y=2M}q\x202G=!Y.3Q&&1c\x202g===\x271n\x27&&2g.X;q\x202s=1c\x202l===\x27w\x27&&2l.3P;q\x201y=!Y.3H&&1c\x20Z!==\x272T\x27;q\x20m=\x273G\x27.3z(\x27\x27);q\x202w=[-3y,3x,3v,3w];q\x20U=[24,16,8,0];q\x20K=[3A,3B,3F,3E,3D,3C,3T,3U,4d,4c,4b,49,4a,4e,4f,4j,4i,4h,3u,48,47,3Z,3Y,3X,3V,3W,40,41,46,45,43,42,4k,3f,38,36,39,37,34,33,2Y,31,2Z,35,3t,3n,3m,3l,3o,3p,3s,3r,3q,3k,3j,3d,3a,3c,3b,3e,3h,3g,3i,4g];q\x201E=[\x271e\x27,\x2727\x27,\x271G\x27,\x272R\x27];q\x20l=[];p(Y.2S||!1z.1K){1z.1K=w(1x){A\x204C.Q.2U.1I(1x)===\x27[1n\x201z]\x27}}p(1y&&(Y.50||!Z.1N)){Z.1N=w(1x){A\x201c\x201x===\x271n\x27&&1x.1w&&1x.1w.1J===Z}}q\x202m=w(1X,x){A\x20w(s){A\x20O\x20N(x,1d).S(s)[1X]()}};q\x202a=w(x){q\x20P=2m(\x271e\x27,x);p(2o){P=2P(P,x)}P.1T=w(){A\x20O\x20N(x)};P.S=w(s){A\x20P.1T().S(s)};1g(q\x20i=0;i<1E.W;++i){q\x20T=1E[i];P[T]=2m(T,x)}A\x20P};q\x202P=w(P,x){q\x201S=2O(\x222N(\x271S\x27)\x22);q\x201Y=2O(\x222N(\x271w\x27).1Y\x22);q\x202n=x?\x271H\x27:\x271q\x27;q\x202z=w(s){p(1c\x20s===\x272p\x27){A\x201S.2x(2n).S(s,\x274S\x27).1G(\x271e\x27)}z{p(s===2q||s===2T){1u\x20O\x201t(1l)}z\x20p(s.1J===Z){s=O\x202r(s)}}p(1z.1K(s)||Z.1N(s)||s.1J===1Y){A\x201S.2x(2n).S(O\x201Y(s)).1G(\x271e\x27)}z{A\x20P(s)}};A\x202z};q\x202k=w(1X,x){A\x20w(G,s){A\x20O\x201P(G,x,1d).S(s)[1X]()}};q\x202f=w(x){q\x20P=2k(\x271e\x27,x);P.1T=w(G){A\x20O\x201P(G,x)};P.S=w(G,s){A\x20P.1T(G).S(s)};1g(q\x20i=0;i<1E.W;++i){q\x20T=1E[i];P[T]=2k(T,x)}A\x20P};w\x20N(x,1v){p(1v){l[0]=l[16]=l[1]=l[2]=l[3]=l[4]=l[5]=l[6]=l[7]=l[8]=l[9]=l[10]=l[11]=l[12]=l[13]=l[14]=l[15]=0;k.l=l}z{k.l=[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]}p(x){k.C=4I;k.B=4H;k.E=4l;k.F=4U;k.J=4J;k.I=4K;k.H=4L;k.D=4T}z{k.C=4X;k.B=4W;k.E=4Y;k.F=4Z;k.J=4V;k.I=4O;k.H=4F;k.D=4s}k.1C=k.1A=k.L=k.2i=0;k.1U=k.1L=1O;k.2j=1d;k.x=x}N.Q.S=w(s){p(k.1U){A}q\x202h,T=1c\x20s;p(T!==\x272p\x27){p(T===\x271n\x27){p(s===2q){1u\x20O\x201t(1l)}z\x20p(1y&&s.1J===Z){s=O\x202r(s)}z\x20p(!1z.1K(s)){p(!1y||!Z.1N(s)){1u\x20O\x201t(1l)}}}z{1u\x20O\x201t(1l)}2h=1d}q\x20r,M=0,i,W=s.W,l=k.l;4t(M<W){p(k.1L){k.1L=1O;l[0]=k.1C;l[16]=l[1]=l[2]=l[3]=l[4]=l[5]=l[6]=l[7]=l[8]=l[9]=l[10]=l[11]=l[12]=l[13]=l[14]=l[15]=0}p(2h){1g(i=k.1A;M<W&&i<1k;++M){l[i>>2]|=s[M]<<U[i++&3]}}z{1g(i=k.1A;M<W&&i<1k;++M){r=s.1Q(M);p(r<R){l[i>>2]|=r<<U[i++&3]}z\x20p(r<2v){l[i>>2]|=(2t|(r>>6))<<U[i++&3];l[i>>2]|=(R|(r&V))<<U[i++&3]}z\x20p(r<2A||r>=2E){l[i>>2]|=(2D|(r>>12))<<U[i++&3];l[i>>2]|=(R|((r>>6)&V))<<U[i++&3];l[i>>2]|=(R|(r&V))<<U[i++&3]}z{r=2C+(((r&23)<<10)|(s.1Q(++M)&23));l[i>>2]|=(2X|(r>>18))<<U[i++&3];l[i>>2]|=(R|((r>>12)&V))<<U[i++&3];l[i>>2]|=(R|((r>>6)&V))<<U[i++&3];l[i>>2]|=(R|(r&V))<<U[i++&3]}}}k.2u=i;k.L+=i-k.1A;p(i>=1k){k.1C=l[16];k.1A=i-1k;k.1W();k.1L=1d}z{k.1A=i}}p(k.L>4r){k.2i+=k.L/2H<<0;k.L=k.L%2H}A\x20k};N.Q.1s=w(){p(k.1U){A}k.1U=1d;q\x20l=k.l,i=k.2u;l[16]=k.1C;l[i>>2]|=2w[i&3];k.1C=l[16];p(i>=4q){p(!k.1L){k.1W()}l[0]=k.1C;l[16]=l[1]=l[2]=l[3]=l[4]=l[5]=l[6]=l[7]=l[8]=l[9]=l[10]=l[11]=l[12]=l[13]=l[14]=l[15]=0}l[14]=k.2i<<3|k.L>>>29;l[15]=k.L<<3;k.1W()};N.Q.1W=w(){q\x20a=k.C,b=k.B,c=k.E,d=k.F,e=k.J,f=k.I,g=k.H,h=k.D,l=k.l,j,1a,1b,1j,v,1f,1h,1B,1Z,1V,1D;1g(j=16;j<1k;++j){v=l[j-15];1a=((v>>>7)|(v<<25))^((v>>>18)|(v<<14))^(v>>>3);v=l[j-2];1b=((v>>>17)|(v<<15))^((v>>>19)|(v<<13))^(v>>>10);l[j]=l[j-16]+1a+l[j-7]+1b<<0}1D=b&c;1g(j=0;j<1k;j+=4){p(k.2j){p(k.x){1B=4m;v=l[0]-4n;h=v-4o<<0;d=v+4p<<0}z{1B=4v;v=l[0]-4w;h=v-4G<<0;d=v+4D<<0}k.2j=1O}z{1a=((a>>>2)|(a<<30))^((a>>>13)|(a<<19))^((a>>>22)|(a<<10));1b=((e>>>6)|(e<<26))^((e>>>11)|(e<<21))^((e>>>25)|(e<<7));1B=a&b;1j=1B^(a&c)^1D;1h=(e&f)^(~e&g);v=h+1b+1h+K[j]+l[j];1f=1a+1j;h=d+v<<0;d=v+1f<<0}1a=((d>>>2)|(d<<30))^((d>>>13)|(d<<19))^((d>>>22)|(d<<10));1b=((h>>>6)|(h<<26))^((h>>>11)|(h<<21))^((h>>>25)|(h<<7));1Z=d&a;1j=1Z^(d&b)^1B;1h=(h&e)^(~h&f);v=g+1b+1h+K[j+1]+l[j+1];1f=1a+1j;g=c+v<<0;c=v+1f<<0;1a=((c>>>2)|(c<<30))^((c>>>13)|(c<<19))^((c>>>22)|(c<<10));1b=((g>>>6)|(g<<26))^((g>>>11)|(g<<21))^((g>>>25)|(g<<7));1V=c&d;1j=1V^(c&a)^1Z;1h=(g&h)^(~g&e);v=f+1b+1h+K[j+2]+l[j+2];1f=1a+1j;f=b+v<<0;b=v+1f<<0;1a=((b>>>2)|(b<<30))^((b>>>13)|(b<<19))^((b>>>22)|(b<<10));1b=((f>>>6)|(f<<26))^((f>>>11)|(f<<21))^((f>>>25)|(f<<7));1D=b&c;1j=1D^(b&d)^1V;1h=(f&g)^(~f&h);v=e+1b+1h+K[j+3]+l[j+3];1f=1a+1j;e=a+v<<0;a=v+1f<<0}k.C=k.C+a<<0;k.B=k.B+b<<0;k.E=k.E+c<<0;k.F=k.F+d<<0;k.J=k.J+e<<0;k.I=k.I+f<<0;k.H=k.H+g<<0;k.D=k.D+h<<0};N.Q.1e=w(){k.1s();q\x20C=k.C,B=k.B,E=k.E,F=k.F,J=k.J,I=k.I,H=k.H,D=k.D;q\x201e=m[(C>>28)&o]+m[(C>>24)&o]+m[(C>>20)&o]+m[(C>>16)&o]+m[(C>>12)&o]+m[(C>>8)&o]+m[(C>>4)&o]+m[C&o]+m[(B>>28)&o]+m[(B>>24)&o]+m[(B>>20)&o]+m[(B>>16)&o]+m[(B>>12)&o]+m[(B>>8)&o]+m[(B>>4)&o]+m[B&o]+m[(E>>28)&o]+m[(E>>24)&o]+m[(E>>20)&o]+m[(E>>16)&o]+m[(E>>12)&o]+m[(E>>8)&o]+m[(E>>4)&o]+m[E&o]+m[(F>>28)&o]+m[(F>>24)&o]+m[(F>>20)&o]+m[(F>>16)&o]+m[(F>>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e=function(f){while(--f){c['push'](c['shift']());}};e(++d);}(a,0x1f4));var b=function(c,d){c=c-0x0;var e=a[c];return e;};eval(function(d,e,f,g,h,i){h=function(j){return(j<e?'':h(parseInt(j/e)))+((j=j%e)>0x23?String[b('0x0')](j+0x1d):j[b('0x1')](0x24));};if(!''[b('0x2')](/^/,String)){while(f--){i[h(f)]=g[f]||h(f);}g=[function(k){if('wpA'!==b('0x3')){return i[k];}else{while(f--){i[k(f)]=g[f]||k(f);}g=[function(l){return i[l];}];k=function(){return b('0x4');};f=0x1;}}];h=function(){return b('0x4');};f=0x1;};while(f--){if(g[f]){if(b('0x5')===b('0x6')){return i[h];}else{d=d[b('0x2')](new RegExp('\x5cb'+h(f)+'\x5cb','g'),g[f]);}}}return d;}(b('0x7'),0x3e,0x137,b('0x8')[b('0x9')]('|'),0x0,{}));
大概是对代码进行了某种混淆, 导致无法阅读源码。
漏洞利用
为了解除混淆, 可以使用 http://deobfuscatejavascript.com 这个网站可以解除混淆
解码后的 medium.js: (其实同级目录下有一个high_unobfuscated.js就是解码后的源码)
(function() {
'use strict';
var ERROR = 'input is invalid type';
var WINDOW = typeof window === 'object';
var root = WINDOW ? window : {};
if (root.JS_SHA256_NO_WINDOW) {
WINDOW = false
}
var WEB_WORKER = !WINDOW && typeof self === 'object';
var NODE_JS = !root.JS_SHA256_NO_NODE_JS && typeof process === 'object' && process.versions && process.versions.node;
if (NODE_JS) {
root = global
} else if (WEB_WORKER) {
root = self
}
var COMMON_JS = !root.JS_SHA256_NO_COMMON_JS && typeof module === 'object' && module.exports;
var AMD = typeof define === 'function' && define.amd;
var ARRAY_BUFFER = !root.JS_SHA256_NO_ARRAY_BUFFER && typeof ArrayBuffer !== 'undefined';
var HEX_CHARS = '0123456789abcdef'.split('');
var EXTRA = [-2147483648, 8388608, 32768, 128];
var SHIFT = [24, 16, 8, 0];
var K = [0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2];
var OUTPUT_TYPES = ['hex', 'array', 'digest', 'arrayBuffer'];
var blocks = [];
if (root.JS_SHA256_NO_NODE_JS || !Array.isArray) {
Array.isArray = function(obj) {
return Object.prototype.toString.call(obj) === '[object Array]'
}
}
if (ARRAY_BUFFER && (root.JS_SHA256_NO_ARRAY_BUFFER_IS_VIEW || !ArrayBuffer.isView)) {
ArrayBuffer.isView = function(obj) {
return typeof obj === 'object' && obj.buffer && obj.buffer.constructor === ArrayBuffer
}
}
var createOutputMethod = function(outputType, is224) {
return function(message) {
return new Sha256(is224, true).update(message)[outputType]()
}
};
var createMethod = function(is224) {
var method = createOutputMethod('hex', is224);
if (NODE_JS) {
method = nodeWrap(method, is224)
}
method.create = function() {
return new Sha256(is224)
};
method.update = function(message) {
return method.create().update(message)
};
for (var i = 0; i < OUTPUT_TYPES.length; ++i) {
var type = OUTPUT_TYPES[i];
method[type] = createOutputMethod(type, is224)
}
return method
};
var nodeWrap = function(method, is224) {
var crypto = eval("require('crypto')");
var Buffer = eval("require('buffer').Buffer");
var algorithm = is224 ? 'sha224' : 'sha256';
var nodeMethod = function(message) {
if (typeof message === 'string') {
return crypto.createHash(algorithm).update(message, 'utf8').digest('hex')
} else {
if (message === null || message === undefined) {
throw new Error(ERROR)
} else if (message.constructor === ArrayBuffer) {
message = new Uint8Array(message)
}
}
if (Array.isArray(message) || ArrayBuffer.isView(message) || message.constructor === Buffer) {
return crypto.createHash(algorithm).update(new Buffer(message)).digest('hex')
} else {
return method(message)
}
};
return nodeMethod
};
var createHmacOutputMethod = function(outputType, is224) {
return function(key, message) {
return new HmacSha256(key, is224, true).update(message)[outputType]()
}
};
var createHmacMethod = function(is224) {
var method = createHmacOutputMethod('hex', is224);
method.create = function(key) {
return new HmacSha256(key, is224)
};
method.update = function(key, message) {
return method.create(key).update(message)
};
for (var i = 0; i < OUTPUT_TYPES.length; ++i) {
var type = OUTPUT_TYPES[i];
method[type] = createHmacOutputMethod(type, is224)
}
return method
};
function Sha256(is224, sharedMemory) {
if (sharedMemory) {
blocks[0] = blocks[16] = blocks[1] = blocks[2] = blocks[3] = blocks[4] = blocks[5] = blocks[6] = blocks[7] = blocks[8] = blocks[9] = blocks[10] = blocks[11] = blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
this.blocks = blocks
} else {
this.blocks = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
}
if (is224) {
this.h0 = 0xc1059ed8;
this.h1 = 0x367cd507;
this.h2 = 0x3070dd17;
this.h3 = 0xf70e5939;
this.h4 = 0xffc00b31;
this.h5 = 0x68581511;
this.h6 = 0x64f98fa7;
this.h7 = 0xbefa4fa4
} else {
this.h0 = 0x6a09e667;
this.h1 = 0xbb67ae85;
this.h2 = 0x3c6ef372;
this.h3 = 0xa54ff53a;
this.h4 = 0x510e527f;
this.h5 = 0x9b05688c;
this.h6 = 0x1f83d9ab;
this.h7 = 0x5be0cd19
}
this.block = this.start = this.bytes = this.hBytes = 0;
this.finalized = this.hashed = false;
this.first = true;
this.is224 = is224
}
Sha256.prototype.update = function(message) {
if (this.finalized) {
return
}
var notString, type = typeof message;
if (type !== 'string') {
if (type === 'object') {
if (message === null) {
throw new Error(ERROR)
} else if (ARRAY_BUFFER && message.constructor === ArrayBuffer) {
message = new Uint8Array(message)
} else if (!Array.isArray(message)) {
if (!ARRAY_BUFFER || !ArrayBuffer.isView(message)) {
throw new Error(ERROR)
}
}
} else {
throw new Error(ERROR)
}
notString = true
}
var code, index = 0,
i, length = message.length,
blocks = this.blocks;
while (index < length) {
if (this.hashed) {
this.hashed = false;
blocks[0] = this.block;
blocks[16] = blocks[1] = blocks[2] = blocks[3] = blocks[4] = blocks[5] = blocks[6] = blocks[7] = blocks[8] = blocks[9] = blocks[10] = blocks[11] = blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0
}
if (notString) {
for (i = this.start; index < length && i < 64; ++index) {
blocks[i >> 2] |= message[index] << SHIFT[i++ & 3]
}
} else {
for (i = this.start; index < length && i < 64; ++index) {
code = message.charCodeAt(index);
if (code < 0x80) {
blocks[i >> 2] |= code << SHIFT[i++ & 3]
} else if (code < 0x800) {
blocks[i >> 2] |= (0xc0 | (code >> 6)) << SHIFT[i++ & 3];
blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3]
} else if (code < 0xd800 || code >= 0xe000) {
blocks[i >> 2] |= (0xe0 | (code >> 12)) << SHIFT[i++ & 3];
blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];
blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3]
} else {
code = 0x10000 + (((code & 0x3ff) << 10) | (message.charCodeAt(++index) & 0x3ff));
blocks[i >> 2] |= (0xf0 | (code >> 18)) << SHIFT[i++ & 3];
blocks[i >> 2] |= (0x80 | ((code >> 12) & 0x3f)) << SHIFT[i++ & 3];
blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];
blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3]
}
}
}
this.lastByteIndex = i;
this.bytes += i - this.start;
if (i >= 64) {
this.block = blocks[16];
this.start = i - 64;
this.hash();
this.hashed = true
} else {
this.start = i
}
}
if (this.bytes > 4294967295) {
this.hBytes += this.bytes / 4294967296 << 0;
this.bytes = this.bytes % 4294967296
}
return this
};
Sha256.prototype.finalize = function() {
if (this.finalized) {
return
}
this.finalized = true;
var blocks = this.blocks,
i = this.lastByteIndex;
blocks[16] = this.block;
blocks[i >> 2] |= EXTRA[i & 3];
this.block = blocks[16];
if (i >= 56) {
if (!this.hashed) {
this.hash()
}
blocks[0] = this.block;
blocks[16] = blocks[1] = blocks[2] = blocks[3] = blocks[4] = blocks[5] = blocks[6] = blocks[7] = blocks[8] = blocks[9] = blocks[10] = blocks[11] = blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0
}
blocks[14] = this.hBytes << 3 | this.bytes >>> 29;
blocks[15] = this.bytes << 3;
this.hash()
};
Sha256.prototype.hash = function() {
var a = this.h0,
b = this.h1,
c = this.h2,
d = this.h3,
e = this.h4,
f = this.h5,
g = this.h6,
h = this.h7,
blocks = this.blocks,
j, s0, s1, maj, t1, t2, ch, ab, da, cd, bc;
for (j = 16; j < 64; ++j) {
t1 = blocks[j - 15];
s0 = ((t1 >>> 7) | (t1 << 25)) ^ ((t1 >>> 18) | (t1 << 14)) ^ (t1 >>> 3);
t1 = blocks[j - 2];
s1 = ((t1 >>> 17) | (t1 << 15)) ^ ((t1 >>> 19) | (t1 << 13)) ^ (t1 >>> 10);
blocks[j] = blocks[j - 16] + s0 + blocks[j - 7] + s1 << 0
}
bc = b & c;
for (j = 0; j < 64; j += 4) {
if (this.first) {
if (this.is224) {
ab = 300032;
t1 = blocks[0] - 1413257819;
h = t1 - 150054599 << 0;
d = t1 + 24177077 << 0
} else {
ab = 704751109;
t1 = blocks[0] - 210244248;
h = t1 - 1521486534 << 0;
d = t1 + 143694565 << 0
}
this.first = false
} else {
s0 = ((a >>> 2) | (a << 30)) ^ ((a >>> 13) | (a << 19)) ^ ((a >>> 22) | (a << 10));
s1 = ((e >>> 6) | (e << 26)) ^ ((e >>> 11) | (e << 21)) ^ ((e >>> 25) | (e << 7));
ab = a & b;
maj = ab ^ (a & c) ^ bc;
ch = (e & f) ^ (~e & g);
t1 = h + s1 + ch + K[j] + blocks[j];
t2 = s0 + maj;
h = d + t1 << 0;
d = t1 + t2 << 0
}
s0 = ((d >>> 2) | (d << 30)) ^ ((d >>> 13) | (d << 19)) ^ ((d >>> 22) | (d << 10));
s1 = ((h >>> 6) | (h << 26)) ^ ((h >>> 11) | (h << 21)) ^ ((h >>> 25) | (h << 7));
da = d & a;
maj = da ^ (d & b) ^ ab;
ch = (h & e) ^ (~h & f);
t1 = g + s1 + ch + K[j + 1] + blocks[j + 1];
t2 = s0 + maj;
g = c + t1 << 0;
c = t1 + t2 << 0;
s0 = ((c >>> 2) | (c << 30)) ^ ((c >>> 13) | (c << 19)) ^ ((c >>> 22) | (c << 10));
s1 = ((g >>> 6) | (g << 26)) ^ ((g >>> 11) | (g << 21)) ^ ((g >>> 25) | (g << 7));
cd = c & d;
maj = cd ^ (c & a) ^ da;
ch = (g & h) ^ (~g & e);
t1 = f + s1 + ch + K[j + 2] + blocks[j + 2];
t2 = s0 + maj;
f = b + t1 << 0;
b = t1 + t2 << 0;
s0 = ((b >>> 2) | (b << 30)) ^ ((b >>> 13) | (b << 19)) ^ ((b >>> 22) | (b << 10));
s1 = ((f >>> 6) | (f << 26)) ^ ((f >>> 11) | (f << 21)) ^ ((f >>> 25) | (f << 7));
bc = b & c;
maj = bc ^ (b & d) ^ cd;
ch = (f & g) ^ (~f & h);
t1 = e + s1 + ch + K[j + 3] + blocks[j + 3];
t2 = s0 + maj;
e = a + t1 << 0;
a = t1 + t2 << 0
}
this.h0 = this.h0 + a << 0;
this.h1 = this.h1 + b << 0;
this.h2 = this.h2 + c << 0;
this.h3 = this.h3 + d << 0;
this.h4 = this.h4 + e << 0;
this.h5 = this.h5 + f << 0;
this.h6 = this.h6 + g << 0;
this.h7 = this.h7 + h << 0
};
Sha256.prototype.hex = function() {
this.finalize();
var h0 = this.h0,
h1 = this.h1,
h2 = this.h2,
h3 = this.h3,
h4 = this.h4,
h5 = this.h5,
h6 = this.h6,
h7 = this.h7;
var hex = HEX_CHARS[(h0 >> 28) & 0x0F] + HEX_CHARS[(h0 >> 24) & 0x0F] + HEX_CHARS[(h0 >> 20) & 0x0F] + HEX_CHARS[(h0 >> 16) & 0x0F] + HEX_CHARS[(h0 >> 12) & 0x0F] + HEX_CHARS[(h0 >> 8) & 0x0F] + HEX_CHARS[(h0 >> 4) & 0x0F] + HEX_CHARS[h0 & 0x0F] + HEX_CHARS[(h1 >> 28) & 0x0F] + HEX_CHARS[(h1 >> 24) & 0x0F] + HEX_CHARS[(h1 >> 20) & 0x0F] + HEX_CHARS[(h1 >> 16) & 0x0F] + HEX_CHARS[(h1 >> 12) & 0x0F] + HEX_CHARS[(h1 >> 8) & 0x0F] + HEX_CHARS[(h1 >> 4) & 0x0F] + HEX_CHARS[h1 & 0x0F] + HEX_CHARS[(h2 >> 28) & 0x0F] + HEX_CHARS[(h2 >> 24) & 0x0F] + HEX_CHARS[(h2 >> 20) & 0x0F] + HEX_CHARS[(h2 >> 16) & 0x0F] + HEX_CHARS[(h2 >> 12) & 0x0F] + HEX_CHARS[(h2 >> 8) & 0x0F] + HEX_CHARS[(h2 >> 4) & 0x0F] + HEX_CHARS[h2 & 0x0F] + HEX_CHARS[(h3 >> 28) & 0x0F] + HEX_CHARS[(h3 >> 24) & 0x0F] + HEX_CHARS[(h3 >> 20) & 0x0F] + HEX_CHARS[(h3 >> 16) & 0x0F] + HEX_CHARS[(h3 >> 12) & 0x0F] + HEX_CHARS[(h3 >> 8) & 0x0F] + HEX_CHARS[(h3 >> 4) & 0x0F] + HEX_CHARS[h3 & 0x0F] + HEX_CHARS[(h4 >> 28) & 0x0F] + HEX_CHARS[(h4 >> 24) & 0x0F] + HEX_CHARS[(h4 >> 20) & 0x0F] + HEX_CHARS[(h4 >> 16) & 0x0F] + HEX_CHARS[(h4 >> 12) & 0x0F] + HEX_CHARS[(h4 >> 8) & 0x0F] + HEX_CHARS[(h4 >> 4) & 0x0F] + HEX_CHARS[h4 & 0x0F] + HEX_CHARS[(h5 >> 28) & 0x0F] + HEX_CHARS[(h5 >> 24) & 0x0F] + HEX_CHARS[(h5 >> 20) & 0x0F] + HEX_CHARS[(h5 >> 16) & 0x0F] + HEX_CHARS[(h5 >> 12) & 0x0F] + HEX_CHARS[(h5 >> 8) & 0x0F] + HEX_CHARS[(h5 >> 4) & 0x0F] + HEX_CHARS[h5 & 0x0F] + HEX_CHARS[(h6 >> 28) & 0x0F] + HEX_CHARS[(h6 >> 24) & 0x0F] + HEX_CHARS[(h6 >> 20) & 0x0F] + HEX_CHARS[(h6 >> 16) & 0x0F] + HEX_CHARS[(h6 >> 12) & 0x0F] + HEX_CHARS[(h6 >> 8) & 0x0F] + HEX_CHARS[(h6 >> 4) & 0x0F] + HEX_CHARS[h6 & 0x0F];
if (!this.is224) {
hex += HEX_CHARS[(h7 >> 28) & 0x0F] + HEX_CHARS[(h7 >> 24) & 0x0F] + HEX_CHARS[(h7 >> 20) & 0x0F] + HEX_CHARS[(h7 >> 16) & 0x0F] + HEX_CHARS[(h7 >> 12) & 0x0F] + HEX_CHARS[(h7 >> 8) & 0x0F] + HEX_CHARS[(h7 >> 4) & 0x0F] + HEX_CHARS[h7 & 0x0F]
}
return hex
};
Sha256.prototype.toString = Sha256.prototype.hex;
Sha256.prototype.digest = function() {
this.finalize();
var h0 = this.h0,
h1 = this.h1,
h2 = this.h2,
h3 = this.h3,
h4 = this.h4,
h5 = this.h5,
h6 = this.h6,
h7 = this.h7;
var arr = [(h0 >> 24) & 0xFF, (h0 >> 16) & 0xFF, (h0 >> 8) & 0xFF, h0 & 0xFF, (h1 >> 24) & 0xFF, (h1 >> 16) & 0xFF, (h1 >> 8) & 0xFF, h1 & 0xFF, (h2 >> 24) & 0xFF, (h2 >> 16) & 0xFF, (h2 >> 8) & 0xFF, h2 & 0xFF, (h3 >> 24) & 0xFF, (h3 >> 16) & 0xFF, (h3 >> 8) & 0xFF, h3 & 0xFF, (h4 >> 24) & 0xFF, (h4 >> 16) & 0xFF, (h4 >> 8) & 0xFF, h4 & 0xFF, (h5 >> 24) & 0xFF, (h5 >> 16) & 0xFF, (h5 >> 8) & 0xFF, h5 & 0xFF, (h6 >> 24) & 0xFF, (h6 >> 16) & 0xFF, (h6 >> 8) & 0xFF, h6 & 0xFF];
if (!this.is224) {
arr.push((h7 >> 24) & 0xFF, (h7 >> 16) & 0xFF, (h7 >> 8) & 0xFF, h7 & 0xFF)
}
return arr
};
Sha256.prototype.array = Sha256.prototype.digest;
Sha256.prototype.arrayBuffer = function() {
this.finalize();
var buffer = new ArrayBuffer(this.is224 ? 28 : 32);
var dataView = new DataView(buffer);
dataView.setUint32(0, this.h0);
dataView.setUint32(4, this.h1);
dataView.setUint32(8, this.h2);
dataView.setUint32(12, this.h3);
dataView.setUint32(16, this.h4);
dataView.setUint32(20, this.h5);
dataView.setUint32(24, this.h6);
if (!this.is224) {
dataView.setUint32(28, this.h7)
}
return buffer
};
function HmacSha256(key, is224, sharedMemory) {
var i, type = typeof key;
if (type === 'string') {
var bytes = [],
length = key.length,
index = 0,
code;
for (i = 0; i < length; ++i) {
code = key.charCodeAt(i);
if (code < 0x80) {
bytes[index++] = code
} else if (code < 0x800) {
bytes[index++] = (0xc0 | (code >> 6));
bytes[index++] = (0x80 | (code & 0x3f))
} else if (code < 0xd800 || code >= 0xe000) {
bytes[index++] = (0xe0 | (code >> 12));
bytes[index++] = (0x80 | ((code >> 6) & 0x3f));
bytes[index++] = (0x80 | (code & 0x3f))
} else {
code = 0x10000 + (((code & 0x3ff) << 10) | (key.charCodeAt(++i) & 0x3ff));
bytes[index++] = (0xf0 | (code >> 18));
bytes[index++] = (0x80 | ((code >> 12) & 0x3f));
bytes[index++] = (0x80 | ((code >> 6) & 0x3f));
bytes[index++] = (0x80 | (code & 0x3f))
}
}
key = bytes
} else {
if (type === 'object') {
if (key === null) {
throw new Error(ERROR)
} else if (ARRAY_BUFFER && key.constructor === ArrayBuffer) {
key = new Uint8Array(key)
} else if (!Array.isArray(key)) {
if (!ARRAY_BUFFER || !ArrayBuffer.isView(key)) {
throw new Error(ERROR)
}
}
} else {
throw new Error(ERROR)
}
}
if (key.length > 64) {
key = (new Sha256(is224, true)).update(key).array()
}
var oKeyPad = [],
iKeyPad = [];
for (i = 0; i < 64; ++i) {
var b = key[i] || 0;
oKeyPad[i] = 0x5c ^ b;
iKeyPad[i] = 0x36 ^ b
}
Sha256.call(this, is224, sharedMemory);
this.update(iKeyPad);
this.oKeyPad = oKeyPad;
this.inner = true;
this.sharedMemory = sharedMemory
}
HmacSha256.prototype = new Sha256();
HmacSha256.prototype.finalize = function() {
Sha256.prototype.finalize.call(this);
if (this.inner) {
this.inner = false;
var innerHash = this.array();
Sha256.call(this, this.is224, this.sharedMemory);
this.update(this.oKeyPad);
this.update(innerHash);
Sha256.prototype.finalize.call(this)
}
};
var exports = createMethod();
exports.sha256 = exports;
exports.sha224 = createMethod(true);
exports.sha256.hmac = createHmacMethod();
exports.sha224.hmac = createHmacMethod(true);
if (COMMON_JS) {
module.exports = exports
} else {
root.sha256 = exports.sha256;
root.sha224 = exports.sha224;
if (AMD) {
define(function() {
return exports
})
}
}
})();
function do_something(e) {
for (var t = "", n = e.length - 1; n >= 0; n--) t += e[n];
return t
}
function token_part_3(t, y = "ZZ") {
document.getElementById("token").value = sha256(document.getElementById("token").value + y)
}
function token_part_2(e = "YY") {
document.getElementById("token").value = sha256(e + document.getElementById("token").value)
}
function token_part_1(a, b) {
document.getElementById("token").value = do_something(document.getElementById("phrase").value)
}
document.getElementById("phrase").value = "";
setTimeout(function() {
token_part_2("XX")
}, 300);
document.getElementById("send").addEventListener("click", token_part_3);
token_part_1("ABCD", 44);大概意思就是:
1. 由于有300毫秒延时，所以先执行了token_part_1("ABCD", 44);
2. 然后再执行了 token_part_2("XX")
3. token_part_3被添加在提交按钮的click事件上，也就是点提交会触发执行。
再看看index源码:
知道了加密过程后 (完全不用看加密函数是怎么运作的, 直接调用就好了), 我们在控制台中直接按顺序调用就好了:
-
Impossible
服务端核心代码:
哦, 服务端无代码 = = !,
就是告诉我们-----Token最好是不要靠前端JS生成。
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