10 lines
1.9 KiB
JavaScript
10 lines
1.9 KiB
JavaScript
// From http://www-cs-students.stanford.edu/~tjw/jsbn/rng.js
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// and http://www-cs-students.stanford.edu/~tjw/jsbn/prng4.js
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// Copyright (c) 2005 Tom Wu
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// http://www-cs-students.stanford.edu/~tjw/jsbn/LICENSE
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function Arcfour(){this.i=0,this.j=0,this.S=new Array}function ARC4init(t){var r,n,i;for(r=0;r<256;++r)this.S[r]=r;for(n=0,r=0;r<256;++r)n=n+this.S[r]+t[r%t.length]&255,i=this.S[r],this.S[r]=this.S[n],this.S[n]=i;this.i=0,this.j=0}function ARC4next(){var t;return this.i=this.i+1&255,this.j=this.j+this.S[this.i]&255,t=this.S[this.i],this.S[this.i]=this.S[this.j],this.S[this.j]=t,this.S[t+this.S[this.i]&255]}function prng_newstate(){return new Arcfour}Arcfour.prototype.init=ARC4init,Arcfour.prototype.next=ARC4next;var rng_state,rng_pool,rng_pptr,rng_psize=256;function rng_seed_int(t){rng_pool[rng_pptr++]^=255&t,rng_pool[rng_pptr++]^=t>>8&255,rng_pool[rng_pptr++]^=t>>16&255,rng_pool[rng_pptr++]^=t>>24&255,rng_pptr>=rng_psize&&(rng_pptr-=rng_psize)}function rng_seed_time(){rng_seed_int((new Date).getTime())}if(null==rng_pool){var t;if(rng_pool=new Array,rng_pptr=0,window.crypto&&window.crypto.getRandomValues){var ua=new Uint8Array(32);for(window.crypto.getRandomValues(ua),t=0;t<32;++t)rng_pool[rng_pptr++]=ua[t]}if("Netscape"==navigator.appName&&navigator.appVersion<"5"&&window.crypto){var z=window.crypto.random(32);for(t=0;t<z.length;++t)rng_pool[rng_pptr++]=255&z.charCodeAt(t)}for(;rng_pptr<rng_psize;)t=Math.floor(65536*Math.random()),rng_pool[rng_pptr++]=t>>>8,rng_pool[rng_pptr++]=255&t;rng_pptr=0,rng_seed_time()}function rng_get_byte(){if(null==rng_state){for(rng_seed_time(),(rng_state=prng_newstate()).init(rng_pool),rng_pptr=0;rng_pptr<rng_pool.length;++rng_pptr)rng_pool[rng_pptr]=0;rng_pptr=0}return rng_state.next()}function rng_get_bytes(t){var r;for(r=0;r<t.length;++r)t[r]=rng_get_byte()}function SecureRandom(){}SecureRandom.prototype.nextBytes=rng_get_bytes;
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export default SecureRandom
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