sha1加密封装方法

在开发项目的时候可能会遇到对数据的加密情况，比如在调用某些第三方接口时，他们要求你对数据进行sha1加密处理

以下是sha1加密处理的方法，新建名叫sha1.js的文件

// SHA1 加密
const encodeUTF8 = (s: any) => {
  let i, r = [], c, x;
  for (i = 0; i < s.length; i++)
    if ((c = s.charCodeAt(i)) < 0x80) r.push(c);
    else if (c < 0x800) r.push(0xC0 + (c >> 6 & 0x1F), 0x80 + (c & 0x3F));
    else {
      if ((x = c ^ 0xD800) >> 10 == 0) //对四字节UTF-16转换为Unicode
        c = (x << 10) + (s.charCodeAt(++i) ^ 0xDC00) + 0x10000,
          r.push(0xF0 + (c >> 18 & 0x7), 0x80 + (c >> 12 & 0x3F));
      else r.push(0xE0 + (c >> 12 & 0xF));
      r.push(0x80 + (c >> 6 & 0x3F), 0x80 + (c & 0x3F));
    };
  return r;
};

// 字符串加密成 hex 字符串
export const sha1 = (s: any) => {
  const data = new Uint8Array(encodeUTF8(s))
  let i, j, t;
  let l = ((data.length + 8) >>> 6 << 4) + 16, s = new Uint8Array(l << 2);
  s.set(new Uint8Array(data.buffer)), s = new Uint32Array(s.buffer);
  for (t = new DataView(s.buffer), i = 0; i < l; i++)s[i] = t.getUint32(i << 2);
  s[data.length >> 2] |= 0x80 << (24 - (data.length & 3) * 8);
  s[l - 1] = data.length << 3;
  let w = [], f = [
    function () { return m[1] & m[2] | ~m[1] & m[3]; },
    function () { return m[1] ^ m[2] ^ m[3]; },
    function () { return m[1] & m[2] | m[1] & m[3] | m[2] & m[3]; },
    function () { return m[1] ^ m[2] ^ m[3]; }
  ], rol = function (n, c) { return n << c | n >>> (32 - c); },
    k = [1518500249, 1859775393, -1894007588, -899497514],
    m = [1732584193, -271733879, null, null, -1009589776];
  m[2] = ~m[0], m[3] = ~m[1];
  for (i = 0; i < s.length; i += 16) {
    let o = m.slice(0);
    for (j = 0; j < 80; j++)
      w[j] = j < 16 ? s[i + j] : rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1),
        t = rol(m[0], 5) + f[j / 20 | 0]() + m[4] + w[j] + k[j / 20 | 0] | 0,
        m[1] = rol(m[1], 30), m.pop(), m.unshift(t);
    for (j = 0; j < 5; j++)m[j] = m[j] + o[j] | 0;
  };
  t = new DataView(new Uint32Array(m).buffer);
  for (let i = 0; i < 5; i++)m[i] = t.getUint32(i << 2);
  const hex = Array.prototype.map.call(new Uint8Array(new Uint32Array(m).buffer), function (e) {
    return (e < 16 ? "0" : "") + e.toString(16);
  }).join("");

  return hex;
};

使用：

// 导入方法
import { sha1 } from '../../utils/sha1'

const str = 'asdfasdf123456sdfasdas'

const signStr = sha1(str)

// 如果需要转大写
const signStr = sha1(str).toUpperCase()