View difference between Paste ID: nkQEVYEr and EdSbT7WN

 /**
  *  XORShiftPlus "non-linear" PRNG
  *  Author: k98kurz (@gmail)
  *  License: MIT
  *  Date: 2020-09-07
  *  Description: Based upon the xorshift128+ generator, one of the fastest generators passing BigCrush.
  *  Methods:
  *      next(n)         returns Uint32Array of n random numbers
  *      nextHex(n)      returns Array of n hexidecimal numbers
  *      bytes(n)        returns Uint8Array of n random bytes
  *      bytesHex(n)     returns Array of n random bytes in hexidecimal
  *      hex(n)          returns hexidecimal string of n bytes
  *  Note: This generates with higher periodicity and better random distribution than the linear XORShift.
  */
 class XORShiftPlus {
   #booted = false;
   #x;
   #y;
   #z;
   #w;
 
   constructor (seed) {
     this.#x = new Uint32Array(1);
     this.#y = new Uint32Array(1);
     this.#z = new Uint32Array(1);
     this.#w = new Uint32Array(1);
     this.#x[0] = seed ? seed|0 : 317973455;
     this.#y[0] = this.#x[0]<<362436069;
     this.#z[0] = this.#y[0]+this.#x[0];
     this.#w[0] = this.#z[0]^this.#x[0]+this.#y[0];
   }
 
   #next () {
     let t = new Uint32Array(1);
     t[0] = this.#x[0]^(this.#x[0]<<11);
     this.#x[0] = this.#y[0];
     this.#y[0] = this.#z[0];
     this.#z[0] = this.#w[0];
     this.#w[0] = this.#w[0]^(this.#w[0]>>19)^(t[0]^(t[0]>>8));
     return this.#w[0]+this.#y[0];
   }
 
   #boot () {
     // if not booted, discard the first numbers as they are somewhat predictable
     if (this.#booted)
       return;
     for (let i=0, n=this.#next(), j=this.#next()%256; i<=j; this.#next(), ++i);
     this.#booted = true;
   }
 
   next (n, option) {
     this.#boot();
     n = (n === undefined || typeof n !== 'number') ? 1 : n;
     let t; n |= 0; n = n>0 ? n : 1;
     option = (option === undefined || typeof n !== 'number') ? 0 : option;
 
     // redundant code, but improved performance
     switch (option) {
       // nextHex
       case 1:
         t = [];
         for (let i=0, il=n; i<il; t[i++] = this.#next().toString(16));
         break;
       // bytes
       case 2:
         t = new Uint8Array(n);
         for (let i=0, il=n; i<il; t[i++] = this.#next());
         break;
       // bytesHex
       case 3:
         t = [];
         for (let i=0, il=n; i<il; t[i] = (this.#next()%256).toString(16), t[i] = t[i].length%2 ? '0'+t[i] : t[i], ++i);
         break;
       // hex
       case 4:
         t = [];
         for (let i=0, il=n; i<il; t[i] = (this.#next()%256).toString(16), t[i] = t[i].length%2 ? '0'+t[i] : t[i], ++i);
         t = t.join('');
         break;
       // next
       default:
         t = new Uint32Array(n);
         for (let i=0, il=n; i<il; t[i++] = this.#next());
     }
     return t;
   };
 
   nextHex (n) { return this.next(n, 1); };
 
   bytes (n) { return this.next(n, 2); };
 
   bytesHex (n) { return this.next(n, 3); };
 
   hex (n) { return this.next(n, 4); };
 }
 
 /**
  *  KeyStream
  *  Author: k98kurz
  *  License: MIT
  *  Date: 2020-09-07
  *  Description: Takes a key and iv, mixes them, and uses the result to seed several XORShiftPlus PRNGs.
  *  Dependency: XORShiftPlus
  *  Methods:
  *
  */
 class KeyStream {
   #csprngs;
   #state;
   #keyLength;
   #keyIndex;
   #stateIndex;
   #workingByte = new Uint8Array(1);
   #key;
   #iv;
 
   constructor (key, iv) {
     if (typeof key == 'undefined')
       throw new Error('KeyStream: key required');
     if (typeof key == 'object' && key instanceof Array)
       key = (typeof key[0] == 'number') ? new Uint8Array(key) : key.join('');
     if (typeof key == 'string')
       key = KeyStream.toUTF8Array(key);
     if (typeof key !== 'object' && !(key instanceof Uint8Array))
       throw new Error('KeyStream: expected key of type String, Array, or Uint8Array');
 
     if (typeof iv == 'undefined')
       throw new Error('KeyStream: iv required');
     if (typeof iv == 'object' && iv instanceof Array)
       iv = (typeof iv[0] == 'number') ? new Uint8Array(iv) : iv.join('');
     if (typeof iv == 'string')
       iv = KeyStream.toUTF8Array(iv);
     if (!(iv instanceof Uint8Array) || iv.length == 0)
       throw new Error('KeyStream: expected iv of type String, Array or Uint8Array');
 
     // set the key and iv private properties
     this.#key = key;
     this.#iv = iv;
 
     // initialize some internal state
     this.#csprngs = []; this.#keyLength = this.#key.length; this.#keyIndex = 0; this.#state = new Uint8Array(64); this.#stateIndex = 0;
     for (let i = 0; i < this.#keyLength; i++) {
       this.#csprngs[i] = new XORShiftPlus(this.#key[i]);
     }
     for (let i = 0, j = 0, c = 0; c < this.#keyLength * 4; ++i, ++j, ++c) {
       j = (j == this.#keyLength) ? 0 : j;
       i = (i == this.#iv.length) ? 0 : i;
       this.#key[j] = this.#key[j] + this.#iv[i];
     }
     for (let i = 0, j = 0; i < 64; ++i, ++j) {
       j = (j == this.#keyLength) ? 0 : j;
       this.#state[i] = this.#csprngs[j].next()[0];
     }
     for (let i = 63, j = 0, t, m; i >= 0; --i, ++j) {
       j = (j == this.#keyLength) ? 0 : j;
       t = (this.#csprngs[j].next()[0] + this.#key[j]) % 64;
       m = this.#state[t];
       this.#state[t] = KeyStream.RXEncrypt(this.#state[i], this.#key[j], this.#workingByte);
       this.#state[i] = KeyStream.RXDecrypt(m, t, this.#workingByte);
     }
   }
 
   #next () {
     this.#keyIndex = (++this.#keyIndex == this.#keyLength) ? 0 : this.#keyIndex;
     this.#stateIndex = (++this.#stateIndex == 64) ? 0 : this.#stateIndex;
     this.#state[this.#stateIndex] = KeyStream.RXEncrypt(this.#state[this.#stateIndex], this.#key[this.#keyIndex], this.#workingByte);
     this.#state[63 - this.#stateIndex] = KeyStream.RXEncrypt(this.#state[63 - this.#stateIndex], this.#state[this.#stateIndex], this.#workingByte);
     return this.#state[this.#stateIndex];
   }
 
   getBytes (nBytes) {
     nBytes = (nBytes|0 ? nBytes|0 : (parseInt(nBytes) ? parseInt(nBytes) : 1));
     let k = new Uint8Array(nBytes);
     for (let o=0; o<nBytes; ++o) {
       k[o] = this.#next();
     }
     return k;
   }
 
   static RXEncrypt (t, k, workingByte) {
     workingByte[0] = (t+k);
     return workingByte[0]^k;
   }
 
   static RXDecrypt (c, k, workingByte) {
     workingByte[0] = (c^k) - k;
     return workingByte[0];
   }
 
   // convert from JavaScript's internal UTF-16 strings to UTF-8
   // ripped from http://stackoverflow.com/a/18729931
   // credit: Joni Salonen
   static toUTF8Array(str) {
     let utf8 = [], charcode;
     for (let i=0; i < str.length; i++) {
       charcode = str.charCodeAt(i);
       if (charcode < 0x80) utf8.push(charcode);
       else if (charcode < 0x800) {
         utf8.push(0xc0 | (charcode >> 6),
             0x80 | (charcode & 0x3f));
       } else if (charcode < 0xd800 || charcode >= 0xe000) {
         utf8.push(0xe0 | (charcode >> 12),
             0x80 | ((charcode>>6) & 0x3f),
             0x80 | (charcode & 0x3f));
       } else { // surrogate pair
         i++;
         // UTF-16 encodes 0x10000-0x10FFFF by
         // subtracting 0x10000 and splitting the
         // 20 bits of 0x0-0xFFFFF into two halves
         charcode = 0x10000 + (((charcode & 0x3ff)<<10)
             | (str.charCodeAt(i) & 0x3ff));
         utf8.push(0xf0 | (charcode >>18),
             0x80 | ((charcode>>12) & 0x3f),
             0x80 | ((charcode>>6) & 0x3f),
             0x80 | (charcode & 0x3f));
       }
     }
     return new Uint8Array(utf8);
   }
 }
 
 /**
- * Title:    RXCipher
+ * Title:        RXCipher
- * Description:    Simple and relatively quick stream cipher algorithm - JavaScript implementation
+ * Description:  Simple and relatively quick stream cipher algorithm - JavaScript implementation
- * Author:    Jonathan Voss
+ * Author:       Jonathan Voss
- * Date:    8/7/2012 (v1.0); 12/16/2014 (v2.0); 11/19/2015 (v3.0); 09/07/2020 (4.0)
+ * Date:         8/7/2012 (v1.0); 12/16/2014 (v2.0); 11/19/2015 (v3.0); 09/07/2020 (4.0)
- * Version:    4.0
+ * Version:      4.1
  * Namespace:    pastebin.com/u/k98kurz; github.com/k98kurz
- * License:    ISC
+ * License:      ISC
  *
  * Basic byte-level algorithm
  * t = plaintext byte, c = ciphertext byte, k = encryption keystream byte
  *    function enc (t, k) { return (t+k>255 ? t+k-256 : t+k)^k; }
  *    function dec (c, k) { return (c^k)-k<0 ? (c^k)-k+256 : (c^k)-k; }
  *
  * Class implementation
  * Instance Methods:
  *    encrypt ( plaintext )
  *      encrypts plaintext with key stream derived from key and iv
- *      encrypts plaintext with key stream derived from skey
+
  *      decrypts ciphertext with key stream derived from key
- *      decrypts ciphertext with key stream derived from skey
+
  *      returns a KeyStream for PRNG generation
  *    reset ()
  *      resets the internal KeyStream
  * Static Methods:
  *    rxencrypt ( key, plaintext, optional iv )
  *      creates ephemeral RXCipher instance, calls encrypt, and returns {ciphertext}.{iv}
- *      creates ephemeral RXCipher instance, calls encrypt, and returns {iv}.{ciphertext}
+
  *      decrypts rxencrypt output
  *
  * Changes:
  *  2.0 (12/16/2014): added pseudo-random key stream; dropped automatic hex conversion of ciphertext
  *  2.1 (12/29/2014): changed default seed value for XORShiftPlus PRNG
  *  2.2 (11/18/2015): converts to/from UTF-8 encoding; new keystream uses multiple csprngs and XORs the key with csprng values
  *  2.3 (11/18/2015): added explicit IV support; made base RXEncrypt & RXDecrypt use a Uint8 byte
  *  3.0 (11/19/2015): changed KeyStream to use an internally mixed 64 byte state; improved IV handling; improved performance
  *  3.1 (02/01/2016): updated KeyStream to use improved/fixed XORShiftPlus class; encrypt/decrypt use hex; encryptRaw/decryptRaw use Uint8Array
  *  3.2 (03/08/2016): bug fix: getKeyStream now returns actual KeyStream; reset method returns this
  *  4.0 (09/07/2020): converted to es6 class; added static helper methods
  *  4.1 (09/08/2020): added one-way hash functions
 */
 class RXCipher {
   #key;
   #iv;
   #stream;
 
   constructor (key, iv) {
     this.#key = (typeof key == 'object' && key instanceof Uint8Array) ? RXCipher.fromUTF8Array(key) : key;
     this.#iv = (typeof iv == 'object' && iv instanceof Uint8Array) ? RXCipher.fromUTF8Array(iv) : iv;
     this.#stream = new KeyStream(this.#key, this.#iv);
   }
 
   #encrypt (plaintext) {
     let ciphertext = new Uint8Array(plaintext.length);
     let key = this.#stream.getBytes(plaintext.length);
     for (let i = 0, ij = plaintext.length; i < ij; ++i) {
       ciphertext[i] = plaintext[i] ^ key[i];
     }
     return ciphertext;
   }
 
   #decrypt (ciphertext) {
     let plaintext = new Uint8Array(ciphertext.length);
     let key = this.#stream.getBytes(ciphertext.length);
     for (let i = 0, ij = ciphertext.length; i < ij; ++i) {
       plaintext[i] = ciphertext[i] ^ key[i];
     }
     return plaintext;
   }
 
   encrypt (plaintext) {
     let ciphertext = this.#encrypt(RXCipher.toUTF8Array(plaintext));
     return RXCipher.toHex(ciphertext);
   }
 
   decrypt (ciphertext) {
     let plaintext = this.#decrypt(RXCipher.fromHex(ciphertext));
     return RXCipher.fromUTF8Array(plaintext);
   }
 
   encryptRaw (plaintext) {
     return this.#encrypt(RXCipher.toUTF8Array(plaintext));
   }
 
   decryptRaw (ciphertext) {
     return RXCipher.fromUTF8Array(this.#decrypt(ciphertext));
   }
 
   static rxencrypt (key, plaintext, iv) {
     if (iv === undefined)
       iv = (new XORShiftPlus(Date.now())).bytes(8);
 
     let rxc = new RXCipher(key, iv);
     let ciphertext = rxc.encrypt(plaintext);
 
     return ciphertext + '.' + RXCipher.toHex(iv);
   }
 
   static rxdecrypt (key, ciphertextString) {
     let ctSplit = ciphertextString.split('.');
     let ciphertext = ctSplit[0];
     let iv = RXCipher.fromHex(ctSplit[1]);
     let rxc = new RXCipher(key, iv);
 
     return rxc.decrypt(ciphertext);
   }
 
   getKeyStream () {
     return new KeyStream(this.#key, this.#iv);
   }
 
   reset () {
     this.#stream = new KeyStream (this.#key, this.#iv);
     return this;
   }
 
   static RXEncrypt (t, k, workingByte) {
     workingByte[0] = (t+k);
     return workingByte[0]^k;
   }
 
   static RXDecrypt (c, k, workingByte) {
     workingByte[0] = (c^k) - k;
     return workingByte[0];
   }
 
   // one-way functions
   static digestRound (data, iv, size) {
     let ks1 = new KeyStream(data, iv);
     let ks2 = new KeyStream(ks1.getBytes(size), ks1.getBytes(size));
     return ks2.getBytes(size);
   }
 
   static digest (data, iv, rounds, size) {
     iv = iv ?? 'yellowsubmarine';
     rounds = rounds ?? 12;
     size = size ?? 32;
     for (let i=0; i<rounds; ++i) {
       data = RXCipher.digestRound(data, iv, size);
     }
 
     return data;
   }
 
   static hashB64 (data, iv, rounds, size) {
     let hash = RXCipher.digest(data, iv, rounds, size);
   	return btoa([].slice.call(hash).map(c => String.fromCharCode(c)).join(''));
   }
 
   static hashHex (data, iv, rounds, size) {
     let hash = RXCipher.digest(data, iv, rounds, size);
     return RXCipher.toHex(hash);
   }
 
   // convert from JavaScript's internal UTF-16 strings to UTF-8
   // ripped from http://stackoverflow.com/a/18729931
   // credit: Joni Salonen
   static toUTF8Array(str) {
     let utf8 = [], charcode;
     for (let i=0; i < str.length; i++) {
       charcode = str.charCodeAt(i);
       if (charcode < 0x80) utf8.push(charcode);
       else if (charcode < 0x800) {
         utf8.push(0xc0 | (charcode >> 6),
             0x80 | (charcode & 0x3f));
       } else if (charcode < 0xd800 || charcode >= 0xe000) {
         utf8.push(0xe0 | (charcode >> 12),
             0x80 | ((charcode>>6) & 0x3f),
             0x80 | (charcode & 0x3f));
       } else { // surrogate pair
         i++;
         // UTF-16 encodes 0x10000-0x10FFFF by
         // subtracting 0x10000 and splitting the
         // 20 bits of 0x0-0xFFFFF into two halves
         charcode = 0x10000 + (((charcode & 0x3ff)<<10)
             | (str.charCodeAt(i) & 0x3ff));
         utf8.push(0xf0 | (charcode >>18),
             0x80 | ((charcode>>12) & 0x3f),
             0x80 | ((charcode>>6) & 0x3f),
             0x80 | (charcode & 0x3f));
       }
     }
     return new Uint8Array(utf8);
   }
 
   // convert from UTF-8 to JavaScript's internal UTF-16 strings
   // ripped from https://github.com/coolaj86/TextEncoderLite
   // credit: AJ ONeal (coolaj86) && Feross Aboukhadijeh (feross)
   static fromUTF8Array (arr) {
     let utf16 = '', tmp = '';
     for (let i = 0, ij = arr.length; i < ij; i++) {
       if (arr[i] <= 0x7F) {
         utf16 += RXCipher.decodeUtf8Char(tmp) + String.fromCharCode(arr[i]);
         tmp = '';
       } else {
         tmp += '%' + arr[i].toString(16);
       }
     }
 
     return utf16 + RXCipher.decodeUtf8Char(tmp);
   }
 
   static decodeUtf8Char (str) {
     try {
       return decodeURIComponent(str);
     } catch (err) {
       return String.fromCharCode(0xFFFD); // UTF 8 invalid char
     }
   }
 
   static toHex (raw) {
     let t = [];
     for (let i=0, il=raw.length; i<il; ++i) {
         t[i] = raw[i].toString(16); t[i] = t[i].length%2 ? '0'+t[i] : t[i];
     }
     return t.join('');
   }
 
   static fromHex (hex) {
     let t = new Uint8Array(hex.length/2);
     for (let i=0, j=0, il=hex.length; i<il; ++i, ++j) {
         t[j] = parseInt(hex[i] + hex[++i], 16);
     }
     return t;
   }
 }