@limm/jsencrypt-mp

Jsencrypt

修改版本的 jsencrypt 使其兼容 uni-app 和 小程序端。同步 jsencrypt 更新。

修改描述

处理了只有浏览器环境下才能使用的变量

• window
• document
• navigator

module 编译类型输出目标改为 ES2015，方便项目打包，去除 rollup 打包时出现的 this 警告

src/lib/jsbn/rng.ts

if (window.crypto && window.crypto.getRandomValues) {
  // Extract entropy (2048 bits) from RNG if available
  const z = new Uint32Array(256)
  window.crypto.getRandomValues(z)
  for (t = 0; t < z.length; ++t) {
    rng_pool[rng_pptr++] = z[t] & 255
  }
}
// Use mouse events for entropy, if we do not have enough entropy by the time
// we need it, entropy will be generated by Math.random.
var count = 0
const onMouseMoveListener = function (ev: Event & { x: number; y: number }) {
  count = count || 0
  if (count >= 256 || rng_pptr >= rng_psize) {
    if (window.removeEventListener) {
      window.removeEventListener('mousemove', onMouseMoveListener, false)
    } else if ((window as any).detachEvent) {
      ;(window as any).detachEvent('onmousemove', onMouseMoveListener)
    }
    return
  }
  try {
    const mouseCoordinates = ev.x + ev.y
    rng_pool[rng_pptr++] = mouseCoordinates & 255
    count += 1
  } catch (e) {
    // Sometimes Firefox will deny permission to access event properties for some reason. Ignore.
  }
}
if (window.addEventListener) {
  window.addEventListener('mousemove', onMouseMoveListener, false)
} else if ((window as any).attachEvent) {
  ;(window as any).attachEvent('onmousemove', onMouseMoveListener)
}

修改后

const getRandomValues = function (array: Uint32Array) {
  for (let i = 0, l = array.length; i < l; i++) {
    array[i] = Math.floor(Math.random() * 256)
  }
  return array
}
const z = new Uint32Array(256)
getRandomValues(z)
for (t = 0; t < z.length; ++t) {
  rng_pool[rng_pptr++] = z[t] & 255
}

src/lib/jsbn/jsbn.ts

// am: Compute w_j += (x*this_i), propagate carries,
// c is initial carry, returns final carry.
// c < 3*dvalue, x < 2*dvalue, this_i < dvalue
// We need to select the fastest one that works in this environment.
const inBrowser = typeof navigator !== "undefined";
if (inBrowser && j_lm && (navigator.appName == "Microsoft Internet Explorer")) {
    // am2 avoids a big mult-and-extract completely.
    // Max digit bits should be <= 30 because we do bitwise ops
    // on values up to 2*hdvalue^2-hdvalue-1 (< 2^31)
    BigInteger.prototype.am = function am2(i:number, x:number, w:BigInteger, j:number, c:number, n:number) {
        const xl = x & 0x7fff;
        const xh = x >> 15;
        while (--n >= 0) {
            let l = this[i] & 0x7fff;
            const h = this[i++] >> 15;
            const m = xh * l + h * xl;
            l = xl * l + ((m & 0x7fff) << 15) + w[j] + (c & 0x3fffffff);
            c = (l >>> 30) + (m >>> 15) + xh * h + (c >>> 30);
            w[j++] = l & 0x3fffffff;
        }
        return c;
    };
    dbits = 30;
} else if (inBrowser && j_lm && (navigator.appName != "Netscape")) {
    // am1: use a single mult and divide to get the high bits,
    // max digit bits should be 26 because
    // max internal value = 2*dvalue^2-2*dvalue (< 2^53)
    BigInteger.prototype.am = function am1(i:number, x:number, w:BigInteger, j:number, c:number, n:number) {
        while (--n >= 0) {
            const v = x * this[i++] + w[j] + c;
            c = Math.floor(v / 0x4000000);
            w[j++] = v & 0x3ffffff;
        }
        return c;
    };
    dbits = 26;
} else { // Mozilla/Netscape seems to prefer am3
    // Alternately, set max digit bits to 28 since some
    // browsers slow down when dealing with 32-bit numbers.
    BigInteger.prototype.am = function am3(i:number, x:number, w:BigInteger, j:number, c:number, n:number) {
        const xl = x & 0x3fff;
        const xh = x >> 14;
        while (--n >= 0) {
            let l = this[i] & 0x3fff;
            const h = this[i++] >> 14;
            const m = xh * l + h * xl;
            l = xl * l + ((m & 0x3fff) << 14) + w[j] + c;
            c = (l >> 28) + (m >> 14) + xh * h;
            w[j++] = l & 0xfffffff;
        }
        return c;
    };
    dbits = 28;
}

修改后

BigInteger.prototype.am = function am3(i:number, x:number, w:BigInteger, j:number, c:number, n:number) {
    const xl = x & 0x3fff;
    const xh = x >> 14;
    while (--n >= 0) {
        let l = this[i] & 0x3fff;
        const h = this[i++] >> 14;
        const m = xh * l + h * xl;
        l = xl * l + ((m & 0x3fff) << 14) + w[j] + c;
        c = (l >> 28) + (m >> 14) + xh * h;
        w[j++] = l & 0xfffffff;
    }
    return c;
};
dbits = 28;

tsconfig-def.json

{
  "compilerOptions": {
    "target": "es5",
}

修改后

{
  "compilerOptions": {
    "target": "ES2015",
}

tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
}

修改后

{
  "compilerOptions": {
    "target": "ES2015",
}