Greasy Fork is available in English.
xxtea
This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/494890/1376202/xxtea-js.js
!function(t){"use strict";var h,u;void 0===t.btoa&&(t.btoa=(h="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".split(""),function(r){var e,t,n,o,a,c,i;for(t=n=0,o=r.length,c=(o-=a=o%3)/3<<2,0<a&&(c+=4),e=new Array(c);t<o;)i=r.charCodeAt(t++)<<16|r.charCodeAt(t++)<<8|r.charCodeAt(t++),e[n++]=h[i>>18]+h[i>>12&63]+h[i>>6&63]+h[63&i];return 1==a?(i=r.charCodeAt(t++),e[n++]=h[i>>2]+h[(3&i)<<4]+"=="):2==a&&(i=r.charCodeAt(t++)<<8|r.charCodeAt(t++),e[n++]=h[i>>10]+h[i>>4&63]+h[(15&i)<<2]+"="),e.join("")})),void 0===t.atob&&(t.atob=(u=[-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1],function(r){var e,t,n,o,a,c,i,h,f,d;if((i=r.length)%4!=0)return"";if(/[^ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\+\/\=]/.test(r))return"";for(f=i,0<(h="="==r.charAt(i-2)?1:"="==r.charAt(i-1)?2:0)&&(f-=4),f=3*(f>>2)+h,d=new Array(f),a=c=0;a<i&&-1!=(e=u[r.charCodeAt(a++)])&&-1!=(t=u[r.charCodeAt(a++)])&&(d[c++]=String.fromCharCode(e<<2|(48&t)>>4),-1!=(n=u[r.charCodeAt(a++)]))&&(d[c++]=String.fromCharCode((15&t)<<4|(60&n)>>2),-1!=(o=u[r.charCodeAt(a++)]));)d[c++]=String.fromCharCode((3&n)<<6|o);return d.join("")}));var d=2654435769;function n(r,e){var t=r.length,n=t<<2;if(e){var o=r[t-1];if(o<(n-=4)-3||n<o)return null;n=o}for(var a=0;a<t;a++)r[a]=String.fromCharCode(255&r[a],r[a]>>>8&255,r[a]>>>16&255,r[a]>>>24&255);var c=r.join("");return e?c.substring(0,n):c}function o(r,e){var t,n=r.length,o=n>>2;0!=(3&n)&&++o,e?(t=new Array(o+1))[o]=n:t=new Array(o);for(var a=0;a<n;++a)t[a>>2]|=r.charCodeAt(a)<<((3&a)<<3);return t}function s(r){return 4294967295&r}function C(r,e,t,n,o,a){return(t>>>5^e<<2)+(e>>>3^t<<4)^(r^e)+(a[3&n^o]^t)}function a(r){return r.length<4&&(r.length=4),r}function c(r){if(/^[\x00-\x7f]*$/.test(r))return r;for(var e=[],t=r.length,n=0,o=0;n<t;++n,++o){var a=r.charCodeAt(n);if(a<128)e[o]=r.charAt(n);else if(a<2048)e[o]=String.fromCharCode(192|a>>6,128|63&a);else{if(!(a<55296||57343<a)){if(n+1<t){var c=r.charCodeAt(n+1);if(a<56320&&56320<=c&&c<=57343){var i=65536+((1023&a)<<10|1023&c);e[o]=String.fromCharCode(240|i>>18&63,128|i>>12&63,128|i>>6&63,128|63&i),++n;continue}}throw new Error("Malformed string")}e[o]=String.fromCharCode(224|a>>12,128|a>>6&63,128|63&a)}}return e.join("")}function i(r,e){return(null==e||e<0)&&(e=r.length),0===e?"":/^[\x00-\x7f]*$/.test(r)||!/^[\x00-\xff]*$/.test(r)?e===r.length?r:r.substr(0,e):(e<32767?function(r,e){for(var t=new Array(e),n=0,o=0,a=r.length;n<e&&o<a;n++){var c=r.charCodeAt(o++);switch(c>>4){case 0:case 1:case 2:case 3:case 4:case 5:case 6:case 7:t[n]=c;break;case 12:case 13:if(!(o<a))throw new Error("Unfinished UTF-8 octet sequence");t[n]=(31&c)<<6|63&r.charCodeAt(o++);break;case 14:if(!(o+1<a))throw new Error("Unfinished UTF-8 octet sequence");t[n]=(15&c)<<12|(63&r.charCodeAt(o++))<<6|63&r.charCodeAt(o++);break;case 15:if(!(o+2<a))throw new Error("Unfinished UTF-8 octet sequence");var i=((7&c)<<18|(63&r.charCodeAt(o++))<<12|(63&r.charCodeAt(o++))<<6|63&r.charCodeAt(o++))-65536;if(!(0<=i&&i<=1048575))throw new Error("Character outside valid Unicode range: 0x"+i.toString(16));t[n++]=i>>10&1023|55296,t[n]=1023&i|56320;break;default:throw new Error("Bad UTF-8 encoding 0x"+c.toString(16))}}return n<e&&(t.length=n),String.fromCharCode.apply(String,t)}:function(r,e){for(var t=[],n=new Array(32768),o=0,a=0,c=r.length;o<e&&a<c;o++){var i=r.charCodeAt(a++);switch(i>>4){case 0:case 1:case 2:case 3:case 4:case 5:case 6:case 7:n[o]=i;break;case 12:case 13:if(!(a<c))throw new Error("Unfinished UTF-8 octet sequence");n[o]=(31&i)<<6|63&r.charCodeAt(a++);break;case 14:if(!(a+1<c))throw new Error("Unfinished UTF-8 octet sequence");n[o]=(15&i)<<12|(63&r.charCodeAt(a++))<<6|63&r.charCodeAt(a++);break;case 15:if(!(a+2<c))throw new Error("Unfinished UTF-8 octet sequence");var h=((7&i)<<18|(63&r.charCodeAt(a++))<<12|(63&r.charCodeAt(a++))<<6|63&r.charCodeAt(a++))-65536;if(!(0<=h&&h<=1048575))throw new Error("Character outside valid Unicode range: 0x"+h.toString(16));n[o++]=h>>10&1023|55296,n[o]=1023&h|56320;break;default:throw new Error("Bad UTF-8 encoding 0x"+i.toString(16))}if(32766<=o){var f=o+1;n.length=f,t[t.length]=String.fromCharCode.apply(String,n),e-=f,o=-1}}return 0<o&&(n.length=o,t[t.length]=String.fromCharCode.apply(String,n)),t.join("")})(r,e)}function f(r,e){return null==r||0===r.length?r:(r=c(r),e=c(e),n(function(r,e){var t,n,o,a,c,i,h=r.length,f=h-1;for(n=r[f],i=(o=0)|Math.floor(6+52/h);0<i;--i){for(a=(o=s(o+d))>>>2&3,c=0;c<f;++c)t=r[c+1],n=r[c]=s(r[c]+C(o,t,n,c,a,e));t=r[0],n=r[f]=s(r[f]+C(o,t,n,f,a,e))}return r}(o(r,!0),a(o(e,!1))),!1))}function l(r,e){return null==r||0===r.length?r:(e=c(e),i(n(function(r,e){var t,n,o,a,c,i=r.length,h=i-1;for(t=r[0],o=s(Math.floor(6+52/i)*d);0!==o;o=s(o-d)){for(a=o>>>2&3,c=h;0<c;--c)n=r[c-1],t=r[c]=s(r[c]-C(o,t,n,c,a,e));n=r[h],t=r[0]=s(r[0]-C(o,t,n,0,a,e))}return r}(o(r,!1),a(o(e,!1))),!0)))}t.XXTEA={utf8Encode:c,utf8Decode:i,encrypt:f,encryptToBase64:function(r,e){return t.btoa(f(r,e))},decrypt:l,decryptFromBase64:function(r,e){return null==r||0===r.length?r:l(t.atob(r),e)}}}(this||[eval][0]("this"));