HTML/text encryption.html at main · LopenaFollower/HTML · GitHub

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<!DOCTYPE html>
<html>
	<head>
		<title>text encryption</title>
		<meta name="viewport"content="width=device-width,initial-scale=1">
		<style>
		</style>
	</head>
	<body>
		<input type=number id=seed_input oninput='updateE();updateD()'/><br>
		<table>
			<tr><td>Encrypt</td><td>Decrypt</td></tr>
			<tr>
				<td>
					<textarea id=encrypt_input oninput='updateE()'></textarea>
				</td>
				<td>
					<textarea id=decrypt_input oninput='updateD()'></textarea>
				</td>
			</tr>
			<tr>
				<td>
					<textarea id=encrypt_output readonly></textarea>
				</td>
				<td>
					<textarea id=decrypt_output readonly></textarea>
				</td>
			</tr>
		</table>
		<script>
const{PI,E,abs,sqrt,cbrt,sin,cos,tan,log,log10,log2}=Math;
function RNG(s){
	const m=2**31;
	let n=abs(Number(s));
	this.nextInt=function(){
		n=(1103515245*n+12345)%m;
		return n;
	}
	this.next=function(){
		return this.nextInt()/(m-1);
	}
}
class Encryption{
	#seed;
	rng(s){
		let i=s.length;
		let r=new RNG(this.#seed*i**2);
		let a;
		while(i--)a=r.next();
		return a;
	}
	step1a(str){
		let l=str.length;
		let a=[...str];
		for(let i=0;i<l;i++){
			let r=this.rng(str)*(l-i)+i|0;
			[a[i],a[r]]=[a[r],a[i]]
		}
		return a.join("");
	}
	step2a(str){
		return btoa(str);
	}
	step3a(str){
		let l=str.length;
		let off=2**this.rng(str)*8|0;
		let ns="";
		for(let i=0;i<l;i++){
			ns+=String.fromCharCode(str.charCodeAt(i)+off);
		}
		return ns;
	}
	step1b(str){
		let l=str.length;
		let a=[...str];
		let tmp=[...a];
		let pairs=[];
		for(let i=0;i<l;i++){
			let r=this.rng(str)*(l-i)+i|0;
			pairs.unshift([i,r]);
		}
		pairs.forEach(([x,y])=>{
			[a[x],a[y]]=[a[y],a[x]];
		});
		return a.join("");
	}
	step2b(str){
		return atob(str);
	}
	step3b(str){
		let l=str.length;
		let off=2**this.rng(str)*8|0;
		let ns="";
		for(let i=0;i<l;i++){
			ns+=String.fromCharCode(str.charCodeAt(i)-off);
		}
		return ns;
	}
	encrypt(str,k){
		this.#seed=sin(k);
		return this.step3a(this.step2a(this.step1a(str)));
	}
	decrypt(str,k){
		this.#seed=sin(k);
		return this.step1b(this.step2b(this.step3b(str)));
	}
}
//shuffle → atob → ceasar → shuffle;
//unshuf  →-ceasar → btoa → unshuf;
const encr=new Encryption();
function updateE(){
	encrypt_output.value="";
	decrypt_input.value=encrypt_output.value=encr.encrypt(encrypt_input.value,Number(seed_input.value));
	updateD();
}
function updateD(){
	decrypt_output.value="";
	decrypt_output.value=encr.decrypt(decrypt_input.value,Number(seed_input.value));
}
seed_input.value=Math.random()*1e5|0;
encrypt_input.value="Text Encrypt";
updateE();updateD();
		</script>
	</body>
</html>