wxmp-rsa/dist/lib/jsbn/prng4.js

兼容小程序环境的rsa加解密库，支持超长文本和中文字符

// prng4.js - uses Arcfour as a PRNG
var Arcfour = /** @class */ (function () {
    function Arcfour() {
        this.i = 0;
        this.j = 0;
        this.S = [];
    }
    // Arcfour.prototype.init = ARC4init;
    // Initialize arcfour context from key, an array of ints, each from [0..255]
    Arcfour.prototype.init = function (key) {
        var i;
        var j;
        var t;
        for (i = 0; i < 256; ++i) {
            this.S[i] = i;
        }
        j = 0;
        for (i = 0; i < 256; ++i) {
            j = (j + this.S[i] + key[i % key.length]) & 255;
            t = this.S[i];
            this.S[i] = this.S[j];
            this.S[j] = t;
        }
        this.i = 0;
        this.j = 0;
    };
    // Arcfour.prototype.next = ARC4next;
    Arcfour.prototype.next = function () {
        var t;
        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;
        return this.S[(t + this.S[this.i]) & 255];
    };
    return Arcfour;
}());
export { Arcfour };
// Plug in your RNG constructor here
export function prng_newstate() {
    return new Arcfour();
}
// Pool size must be a multiple of 4 and greater than 32.
// An array of bytes the size of the pool will be passed to init()
export var rng_psize = 256;