[Front-end skills] Simple use of js-md5

@Author:Outman
@Date:2023-03-27

Simple use of js-md5

The full name of MD5 (single item hash algorithm) is Message-Digest Algorithm 5 (information-digest algorithm), developed from MD2, MD3 and MD4.
功能:1. Input information of any length, after processing, output 32-bit information; 2. Different results obtained from different inputs (uniqueness); 3. It is impossible to deduce the input information based on the 32-bit input results (irreversible)

用途:1. To prevent tampering, publish the MD5 value of the file at the same time when publishing the file, and perform MD5 calculation again after the other party receives the file. The final result is the same, indicating that it has not been tampered with; Common uses, often after clicking submit on some pages, the password is encrypted by md5, and the password box is suddenly filled with several passwords; 3. As a digital signature.

1. Install js-md5

npm i js-md5

2. Import & mount

import md5 from 'js-md5';
Vue.prototype.$md5Util = md5;

3. use

this.$md5Util("请将我这段文字加密")

4. Encrypt the result

// 加密结果:aa888a86dca6e9d5ae216c23070e8c47

5.js-md5 source code

md5中还包含hex/digest/array/arrayBuffer/base64 等多种使用方式,可通过下方js-md5的源码详细了解!
/**
 * [js-md5]{
    
    @link https://github.com/emn178/js-md5}
 *
 * @namespace md5
 * @version 0.7.3
 * @author Chen, Yi-Cyuan [[email protected]]
 * @copyright Chen, Yi-Cyuan 2014-2017
 * @license MIT
 */
(function () {
    
    
  'use strict';

  var ERROR = 'input is invalid type';
  var WINDOW = typeof window === 'object';
  var root = WINDOW ? window : {
    
    };
  if (root.JS_MD5_NO_WINDOW) {
    
    
    WINDOW = false;
  }
  var WEB_WORKER = !WINDOW && typeof self === 'object';
  var NODE_JS = !root.JS_MD5_NO_NODE_JS && typeof process === 'object' && process.versions && process.versions.node;
  if (NODE_JS) {
    
    
    root = global;
  } else if (WEB_WORKER) {
    
    
    root = self;
  }
  var COMMON_JS = !root.JS_MD5_NO_COMMON_JS && typeof module === 'object' && module.exports;
  var AMD = typeof define === 'function' && define.amd;
  var ARRAY_BUFFER = !root.JS_MD5_NO_ARRAY_BUFFER && typeof ArrayBuffer !== 'undefined';
  var HEX_CHARS = '0123456789abcdef'.split('');
  var EXTRA = [128, 32768, 8388608, -2147483648];
  var SHIFT = [0, 8, 16, 24];
  var OUTPUT_TYPES = ['hex', 'array', 'digest', 'buffer', 'arrayBuffer', 'base64'];
  var BASE64_ENCODE_CHAR = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'.split('');

  var blocks = [], buffer8;
  if (ARRAY_BUFFER) {
    
    
    var buffer = new ArrayBuffer(68);
    buffer8 = new Uint8Array(buffer);
    blocks = new Uint32Array(buffer);
  }

  if (root.JS_MD5_NO_NODE_JS || !Array.isArray) {
    
    
    Array.isArray = function (obj) {
    
    
      return Object.prototype.toString.call(obj) === '[object Array]';
    };
  }

  if (ARRAY_BUFFER && (root.JS_MD5_NO_ARRAY_BUFFER_IS_VIEW || !ArrayBuffer.isView)) {
    
    
    ArrayBuffer.isView = function (obj) {
    
    
      return typeof obj === 'object' && obj.buffer && obj.buffer.constructor === ArrayBuffer;
    };
  }

  /**
   * @method hex
   * @memberof md5
   * @description Output hash as hex string
   * @param {
    
    String|Array|Uint8Array|ArrayBuffer} message message to hash
   * @returns {
    
    String} Hex string
   * @example
   * md5.hex('The quick brown fox jumps over the lazy dog');
   * // equal to
   * md5('The quick brown fox jumps over the lazy dog');
   */
  /**
   * @method digest
   * @memberof md5
   * @description Output hash as bytes array
   * @param {
    
    String|Array|Uint8Array|ArrayBuffer} message message to hash
   * @returns {
    
    Array} Bytes array
   * @example
   * md5.digest('The quick brown fox jumps over the lazy dog');
   */
  /**
   * @method array
   * @memberof md5
   * @description Output hash as bytes array
   * @param {
    
    String|Array|Uint8Array|ArrayBuffer} message message to hash
   * @returns {
    
    Array} Bytes array
   * @example
   * md5.array('The quick brown fox jumps over the lazy dog');
   */
  /**
   * @method arrayBuffer
   * @memberof md5
   * @description Output hash as ArrayBuffer
   * @param {
    
    String|Array|Uint8Array|ArrayBuffer} message message to hash
   * @returns {
    
    ArrayBuffer} ArrayBuffer
   * @example
   * md5.arrayBuffer('The quick brown fox jumps over the lazy dog');
   */
  /**
   * @method buffer
   * @deprecated This maybe confuse with Buffer in node.js. Please use arrayBuffer instead.
   * @memberof md5
   * @description Output hash as ArrayBuffer
   * @param {
    
    String|Array|Uint8Array|ArrayBuffer} message message to hash
   * @returns {
    
    ArrayBuffer} ArrayBuffer
   * @example
   * md5.buffer('The quick brown fox jumps over the lazy dog');
   */
  /**
   * @method base64
   * @memberof md5
   * @description Output hash as base64 string
   * @param {
    
    String|Array|Uint8Array|ArrayBuffer} message message to hash
   * @returns {
    
    String} base64 string
   * @example
   * md5.base64('The quick brown fox jumps over the lazy dog');
   */
  var createOutputMethod = function (outputType) {
    
    
    return function (message) {
    
    
      return new Md5(true).update(message)[outputType]();
    };
  };

  /**
   * @method create
   * @memberof md5
   * @description Create Md5 object
   * @returns {
    
    Md5} Md5 object.
   * @example
   * var hash = md5.create();
   */
  /**
   * @method update
   * @memberof md5
   * @description Create and update Md5 object
   * @param {
    
    String|Array|Uint8Array|ArrayBuffer} message message to hash
   * @returns {
    
    Md5} Md5 object.
   * @example
   * var hash = md5.update('The quick brown fox jumps over the lazy dog');
   * // equal to
   * var hash = md5.create();
   * hash.update('The quick brown fox jumps over the lazy dog');
   */
  var createMethod = function () {
    
    
    var method = createOutputMethod('hex');
    if (NODE_JS) {
    
    
      method = nodeWrap(method);
    }
    method.create = function () {
    
    
      return new Md5();
    };
    method.update = function (message) {
    
    
      return method.create().update(message);
    };
    for (var i = 0; i < OUTPUT_TYPES.length; ++i) {
    
    
      var type = OUTPUT_TYPES[i];
      method[type] = createOutputMethod(type);
    }
    return method;
  };

  var nodeWrap = function (method) {
    
    
    var crypto = eval("require('crypto')");
    var Buffer = eval("require('buffer').Buffer");
    var nodeMethod = function (message) {
    
    
      if (typeof message === 'string') {
    
    
        return crypto.createHash('md5').update(message, 'utf8').digest('hex');
      } else {
    
    
        if (message === null || message === undefined) {
    
    
          throw ERROR;
        } else if (message.constructor === ArrayBuffer) {
    
    
          message = new Uint8Array(message);
        }
      }
      if (Array.isArray(message) || ArrayBuffer.isView(message) ||
        message.constructor === Buffer) {
    
    
        return crypto.createHash('md5').update(new Buffer(message)).digest('hex');
      } else {
    
    
        return method(message);
      }
    };
    return nodeMethod;
  };

  /**
   * Md5 class
   * @class Md5
   * @description This is internal class.
   * @see {
    
    @link md5.create}
   */
  function Md5(sharedMemory) {
    
    
    if (sharedMemory) {
    
    
      blocks[0] = blocks[16] = blocks[1] = blocks[2] = blocks[3] =
      blocks[4] = blocks[5] = blocks[6] = blocks[7] =
      blocks[8] = blocks[9] = blocks[10] = blocks[11] =
      blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
      this.blocks = blocks;
      this.buffer8 = buffer8;
    } else {
    
    
      if (ARRAY_BUFFER) {
    
    
        var buffer = new ArrayBuffer(68);
        this.buffer8 = new Uint8Array(buffer);
        this.blocks = new Uint32Array(buffer);
      } else {
    
    
        this.blocks = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
      }
    }
    this.h0 = this.h1 = this.h2 = this.h3 = this.start = this.bytes = this.hBytes = 0;
    this.finalized = this.hashed = false;
    this.first = true;
  }

  /**
   * @method update
   * @memberof Md5
   * @instance
   * @description Update hash
   * @param {
    
    String|Array|Uint8Array|ArrayBuffer} message message to hash
   * @returns {
    
    Md5} Md5 object.
   * @see {
    
    @link md5.update}
   */
  Md5.prototype.update = function (message) {
    
    
    if (this.finalized) {
    
    
      return;
    }

    var notString, type = typeof message;
    if (type !== 'string') {
    
    
      if (type === 'object') {
    
    
        if (message === null) {
    
    
          throw ERROR;
        } else if (ARRAY_BUFFER && message.constructor === ArrayBuffer) {
    
    
          message = new Uint8Array(message);
        } else if (!Array.isArray(message)) {
    
    
          if (!ARRAY_BUFFER || !ArrayBuffer.isView(message)) {
    
    
            throw ERROR;
          }
        }
      } else {
    
    
        throw ERROR;
      }
      notString = true;
    }
    var code, index = 0, i, length = message.length, blocks = this.blocks;
    var buffer8 = this.buffer8;

    while (index < length) {
    
    
      if (this.hashed) {
    
    
        this.hashed = false;
        blocks[0] = blocks[16];
        blocks[16] = blocks[1] = blocks[2] = blocks[3] =
        blocks[4] = blocks[5] = blocks[6] = blocks[7] =
        blocks[8] = blocks[9] = blocks[10] = blocks[11] =
        blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
      }

      if (notString) {
    
    
        if (ARRAY_BUFFER) {
    
    
          for (i = this.start; index < length && i < 64; ++index) {
    
    
            buffer8[i++] = message[index];
          }
        } else {
    
    
          for (i = this.start; index < length && i < 64; ++index) {
    
    
            blocks[i >> 2] |= message[index] << SHIFT[i++ & 3];
          }
        }
      } else {
    
    
        if (ARRAY_BUFFER) {
    
    
          for (i = this.start; index < length && i < 64; ++index) {
    
    
            code = message.charCodeAt(index);
            if (code < 0x80) {
    
    
              buffer8[i++] = code;
            } else if (code < 0x800) {
    
    
              buffer8[i++] = 0xc0 | (code >> 6);
              buffer8[i++] = 0x80 | (code & 0x3f);
            } else if (code < 0xd800 || code >= 0xe000) {
    
    
              buffer8[i++] = 0xe0 | (code >> 12);
              buffer8[i++] = 0x80 | ((code >> 6) & 0x3f);
              buffer8[i++] = 0x80 | (code & 0x3f);
            } else {
              code = 0x10000 + (((code & 0x3ff) << 10) | (message.charCodeAt(++index) & 0x3ff));
              buffer8[i++] = 0xf0 | (code >> 18);
              buffer8[i++] = 0x80 | ((code >> 12) & 0x3f);
              buffer8[i++] = 0x80 | ((code >> 6) & 0x3f);
              buffer8[i++] = 0x80 | (code & 0x3f);
            }
          }
        } else {
          for (i = this.start; index < length && i < 64; ++index) {
            code = message.charCodeAt(index);
            if (code < 0x80) {
              blocks[i >> 2] |= code << SHIFT[i++ & 3];
            } else if (code < 0x800) {
              blocks[i >> 2] |= (0xc0 | (code >> 6)) << SHIFT[i++ & 3];
              blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
            } else if (code < 0xd800 || code >= 0xe000) {
    
    
              blocks[i >> 2] |= (0xe0 | (code >> 12)) << SHIFT[i++ & 3];
              blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];
              blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
            } else {
    
    
              code = 0x10000 + (((code & 0x3ff) << 10) | (message.charCodeAt(++index) & 0x3ff));
              blocks[i >> 2] |= (0xf0 | (code >> 18)) << SHIFT[i++ & 3];
              blocks[i >> 2] |= (0x80 | ((code >> 12) & 0x3f)) << SHIFT[i++ & 3];
              blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];
              blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
            }
          }
        }
      }
      this.lastByteIndex = i;
      this.bytes += i - this.start;
      if (i >= 64) {
    
    
        this.start = i - 64;
        this.hash();
        this.hashed = true;
      } else {
    
    
        this.start = i;
      }
    }
    if (this.bytes > 4294967295) {
    
    
      this.hBytes += this.bytes / 4294967296 << 0;
      this.bytes = this.bytes % 4294967296;
    }
    return this;
  };

  Md5.prototype.finalize = function () {
    
    
    if (this.finalized) {
    
    
      return;
    }
    this.finalized = true;
    var blocks = this.blocks, i = this.lastByteIndex;
    blocks[i >> 2] |= EXTRA[i & 3];
    if (i >= 56) {
    
    
      if (!this.hashed) {
    
    
        this.hash();
      }
      blocks[0] = blocks[16];
      blocks[16] = blocks[1] = blocks[2] = blocks[3] =
      blocks[4] = blocks[5] = blocks[6] = blocks[7] =
      blocks[8] = blocks[9] = blocks[10] = blocks[11] =
      blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
    }
    blocks[14] = this.bytes << 3;
    blocks[15] = this.hBytes << 3 | this.bytes >>> 29;
    this.hash();
  };

  Md5.prototype.hash = function () {
    
    
    var a, b, c, d, bc, da, blocks = this.blocks;

    if (this.first) {
    
    
      a = blocks[0] - 680876937;
      a = (a << 7 | a >>> 25) - 271733879 << 0;
      d = (-1732584194 ^ a & 2004318071) + blocks[1] - 117830708;
      d = (d << 12 | d >>> 20) + a << 0;
      c = (-271733879 ^ (d & (a ^ -271733879))) + blocks[2] - 1126478375;
      c = (c << 17 | c >>> 15) + d << 0;
      b = (a ^ (c & (d ^ a))) + blocks[3] - 1316259209;
      b = (b << 22 | b >>> 10) + c << 0;
    } else {
    
    
      a = this.h0;
      b = this.h1;
      c = this.h2;
      d = this.h3;
      a += (d ^ (b & (c ^ d))) + blocks[0] - 680876936;
      a = (a << 7 | a >>> 25) + b << 0;
      d += (c ^ (a & (b ^ c))) + blocks[1] - 389564586;
      d = (d << 12 | d >>> 20) + a << 0;
      c += (b ^ (d & (a ^ b))) + blocks[2] + 606105819;
      c = (c << 17 | c >>> 15) + d << 0;
      b += (a ^ (c & (d ^ a))) + blocks[3] - 1044525330;
      b = (b << 22 | b >>> 10) + c << 0;
    }

    a += (d ^ (b & (c ^ d))) + blocks[4] - 176418897;
    a = (a << 7 | a >>> 25) + b << 0;
    d += (c ^ (a & (b ^ c))) + blocks[5] + 1200080426;
    d = (d << 12 | d >>> 20) + a << 0;
    c += (b ^ (d & (a ^ b))) + blocks[6] - 1473231341;
    c = (c << 17 | c >>> 15) + d << 0;
    b += (a ^ (c & (d ^ a))) + blocks[7] - 45705983;
    b = (b << 22 | b >>> 10) + c << 0;
    a += (d ^ (b & (c ^ d))) + blocks[8] + 1770035416;
    a = (a << 7 | a >>> 25) + b << 0;
    d += (c ^ (a & (b ^ c))) + blocks[9] - 1958414417;
    d = (d << 12 | d >>> 20) + a << 0;
    c += (b ^ (d & (a ^ b))) + blocks[10] - 42063;
    c = (c << 17 | c >>> 15) + d << 0;
    b += (a ^ (c & (d ^ a))) + blocks[11] - 1990404162;
    b = (b << 22 | b >>> 10) + c << 0;
    a += (d ^ (b & (c ^ d))) + blocks[12] + 1804603682;
    a = (a << 7 | a >>> 25) + b << 0;
    d += (c ^ (a & (b ^ c))) + blocks[13] - 40341101;
    d = (d << 12 | d >>> 20) + a << 0;
    c += (b ^ (d & (a ^ b))) + blocks[14] - 1502002290;
    c = (c << 17 | c >>> 15) + d << 0;
    b += (a ^ (c & (d ^ a))) + blocks[15] + 1236535329;
    b = (b << 22 | b >>> 10) + c << 0;
    a += (c ^ (d & (b ^ c))) + blocks[1] - 165796510;
    a = (a << 5 | a >>> 27) + b << 0;
    d += (b ^ (c & (a ^ b))) + blocks[6] - 1069501632;
    d = (d << 9 | d >>> 23) + a << 0;
    c += (a ^ (b & (d ^ a))) + blocks[11] + 643717713;
    c = (c << 14 | c >>> 18) + d << 0;
    b += (d ^ (a & (c ^ d))) + blocks[0] - 373897302;
    b = (b << 20 | b >>> 12) + c << 0;
    a += (c ^ (d & (b ^ c))) + blocks[5] - 701558691;
    a = (a << 5 | a >>> 27) + b << 0;
    d += (b ^ (c & (a ^ b))) + blocks[10] + 38016083;
    d = (d << 9 | d >>> 23) + a << 0;
    c += (a ^ (b & (d ^ a))) + blocks[15] - 660478335;
    c = (c << 14 | c >>> 18) + d << 0;
    b += (d ^ (a & (c ^ d))) + blocks[4] - 405537848;
    b = (b << 20 | b >>> 12) + c << 0;
    a += (c ^ (d & (b ^ c))) + blocks[9] + 568446438;
    a = (a << 5 | a >>> 27) + b << 0;
    d += (b ^ (c & (a ^ b))) + blocks[14] - 1019803690;
    d = (d << 9 | d >>> 23) + a << 0;
    c += (a ^ (b & (d ^ a))) + blocks[3] - 187363961;
    c = (c << 14 | c >>> 18) + d << 0;
    b += (d ^ (a & (c ^ d))) + blocks[8] + 1163531501;
    b = (b << 20 | b >>> 12) + c << 0;
    a += (c ^ (d & (b ^ c))) + blocks[13] - 1444681467;
    a = (a << 5 | a >>> 27) + b << 0;
    d += (b ^ (c & (a ^ b))) + blocks[2] - 51403784;
    d = (d << 9 | d >>> 23) + a << 0;
    c += (a ^ (b & (d ^ a))) + blocks[7] + 1735328473;
    c = (c << 14 | c >>> 18) + d << 0;
    b += (d ^ (a & (c ^ d))) + blocks[12] - 1926607734;
    b = (b << 20 | b >>> 12) + c << 0;
    bc = b ^ c;
    a += (bc ^ d) + blocks[5] - 378558;
    a = (a << 4 | a >>> 28) + b << 0;
    d += (bc ^ a) + blocks[8] - 2022574463;
    d = (d << 11 | d >>> 21) + a << 0;
    da = d ^ a;
    c += (da ^ b) + blocks[11] + 1839030562;
    c = (c << 16 | c >>> 16) + d << 0;
    b += (da ^ c) + blocks[14] - 35309556;
    b = (b << 23 | b >>> 9) + c << 0;
    bc = b ^ c;
    a += (bc ^ d) + blocks[1] - 1530992060;
    a = (a << 4 | a >>> 28) + b << 0;
    d += (bc ^ a) + blocks[4] + 1272893353;
    d = (d << 11 | d >>> 21) + a << 0;
    da = d ^ a;
    c += (da ^ b) + blocks[7] - 155497632;
    c = (c << 16 | c >>> 16) + d << 0;
    b += (da ^ c) + blocks[10] - 1094730640;
    b = (b << 23 | b >>> 9) + c << 0;
    bc = b ^ c;
    a += (bc ^ d) + blocks[13] + 681279174;
    a = (a << 4 | a >>> 28) + b << 0;
    d += (bc ^ a) + blocks[0] - 358537222;
    d = (d << 11 | d >>> 21) + a << 0;
    da = d ^ a;
    c += (da ^ b) + blocks[3] - 722521979;
    c = (c << 16 | c >>> 16) + d << 0;
    b += (da ^ c) + blocks[6] + 76029189;
    b = (b << 23 | b >>> 9) + c << 0;
    bc = b ^ c;
    a += (bc ^ d) + blocks[9] - 640364487;
    a = (a << 4 | a >>> 28) + b << 0;
    d += (bc ^ a) + blocks[12] - 421815835;
    d = (d << 11 | d >>> 21) + a << 0;
    da = d ^ a;
    c += (da ^ b) + blocks[15] + 530742520;
    c = (c << 16 | c >>> 16) + d << 0;
    b += (da ^ c) + blocks[2] - 995338651;
    b = (b << 23 | b >>> 9) + c << 0;
    a += (c ^ (b | ~d)) + blocks[0] - 198630844;
    a = (a << 6 | a >>> 26) + b << 0;
    d += (b ^ (a | ~c)) + blocks[7] + 1126891415;
    d = (d << 10 | d >>> 22) + a << 0;
    c += (a ^ (d | ~b)) + blocks[14] - 1416354905;
    c = (c << 15 | c >>> 17) + d << 0;
    b += (d ^ (c | ~a)) + blocks[5] - 57434055;
    b = (b << 21 | b >>> 11) + c << 0;
    a += (c ^ (b | ~d)) + blocks[12] + 1700485571;
    a = (a << 6 | a >>> 26) + b << 0;
    d += (b ^ (a | ~c)) + blocks[3] - 1894986606;
    d = (d << 10 | d >>> 22) + a << 0;
    c += (a ^ (d | ~b)) + blocks[10] - 1051523;
    c = (c << 15 | c >>> 17) + d << 0;
    b += (d ^ (c | ~a)) + blocks[1] - 2054922799;
    b = (b << 21 | b >>> 11) + c << 0;
    a += (c ^ (b | ~d)) + blocks[8] + 1873313359;
    a = (a << 6 | a >>> 26) + b << 0;
    d += (b ^ (a | ~c)) + blocks[15] - 30611744;
    d = (d << 10 | d >>> 22) + a << 0;
    c += (a ^ (d | ~b)) + blocks[6] - 1560198380;
    c = (c << 15 | c >>> 17) + d << 0;
    b += (d ^ (c | ~a)) + blocks[13] + 1309151649;
    b = (b << 21 | b >>> 11) + c << 0;
    a += (c ^ (b | ~d)) + blocks[4] - 145523070;
    a = (a << 6 | a >>> 26) + b << 0;
    d += (b ^ (a | ~c)) + blocks[11] - 1120210379;
    d = (d << 10 | d >>> 22) + a << 0;
    c += (a ^ (d | ~b)) + blocks[2] + 718787259;
    c = (c << 15 | c >>> 17) + d << 0;
    b += (d ^ (c | ~a)) + blocks[9] - 343485551;
    b = (b << 21 | b >>> 11) + c << 0;

    if (this.first) {
    
    
      this.h0 = a + 1732584193 << 0;
      this.h1 = b - 271733879 << 0;
      this.h2 = c - 1732584194 << 0;
      this.h3 = d + 271733878 << 0;
      this.first = false;
    } else {
    
    
      this.h0 = this.h0 + a << 0;
      this.h1 = this.h1 + b << 0;
      this.h2 = this.h2 + c << 0;
      this.h3 = this.h3 + d << 0;
    }
  };

  /**
   * @method hex
   * @memberof Md5
   * @instance
   * @description Output hash as hex string
   * @returns {
    
    String} Hex string
   * @see {
    
    @link md5.hex}
   * @example
   * hash.hex();
   */
  Md5.prototype.hex = function () {
    
    
    this.finalize();

    var h0 = this.h0, h1 = this.h1, h2 = this.h2, h3 = this.h3;

    return HEX_CHARS[(h0 >> 4) & 0x0F] + HEX_CHARS[h0 & 0x0F] +
      HEX_CHARS[(h0 >> 12) & 0x0F] + HEX_CHARS[(h0 >> 8) & 0x0F] +
      HEX_CHARS[(h0 >> 20) & 0x0F] + HEX_CHARS[(h0 >> 16) & 0x0F] +
      HEX_CHARS[(h0 >> 28) & 0x0F] + HEX_CHARS[(h0 >> 24) & 0x0F] +
      HEX_CHARS[(h1 >> 4) & 0x0F] + HEX_CHARS[h1 & 0x0F] +
      HEX_CHARS[(h1 >> 12) & 0x0F] + HEX_CHARS[(h1 >> 8) & 0x0F] +
      HEX_CHARS[(h1 >> 20) & 0x0F] + HEX_CHARS[(h1 >> 16) & 0x0F] +
      HEX_CHARS[(h1 >> 28) & 0x0F] + HEX_CHARS[(h1 >> 24) & 0x0F] +
      HEX_CHARS[(h2 >> 4) & 0x0F] + HEX_CHARS[h2 & 0x0F] +
      HEX_CHARS[(h2 >> 12) & 0x0F] + HEX_CHARS[(h2 >> 8) & 0x0F] +
      HEX_CHARS[(h2 >> 20) & 0x0F] + HEX_CHARS[(h2 >> 16) & 0x0F] +
      HEX_CHARS[(h2 >> 28) & 0x0F] + HEX_CHARS[(h2 >> 24) & 0x0F] +
      HEX_CHARS[(h3 >> 4) & 0x0F] + HEX_CHARS[h3 & 0x0F] +
      HEX_CHARS[(h3 >> 12) & 0x0F] + HEX_CHARS[(h3 >> 8) & 0x0F] +
      HEX_CHARS[(h3 >> 20) & 0x0F] + HEX_CHARS[(h3 >> 16) & 0x0F] +
      HEX_CHARS[(h3 >> 28) & 0x0F] + HEX_CHARS[(h3 >> 24) & 0x0F];
  };

  /**
   * @method toString
   * @memberof Md5
   * @instance
   * @description Output hash as hex string
   * @returns {
    
    String} Hex string
   * @see {
    
    @link md5.hex}
   * @example
   * hash.toString();
   */
  Md5.prototype.toString = Md5.prototype.hex;

  /**
   * @method digest
   * @memberof Md5
   * @instance
   * @description Output hash as bytes array
   * @returns {
    
    Array} Bytes array
   * @see {
    
    @link md5.digest}
   * @example
   * hash.digest();
   */
  Md5.prototype.digest = function () {
    
    
    this.finalize();

    var h0 = this.h0, h1 = this.h1, h2 = this.h2, h3 = this.h3;
    return [
      h0 & 0xFF, (h0 >> 8) & 0xFF, (h0 >> 16) & 0xFF, (h0 >> 24) & 0xFF,
      h1 & 0xFF, (h1 >> 8) & 0xFF, (h1 >> 16) & 0xFF, (h1 >> 24) & 0xFF,
      h2 & 0xFF, (h2 >> 8) & 0xFF, (h2 >> 16) & 0xFF, (h2 >> 24) & 0xFF,
      h3 & 0xFF, (h3 >> 8) & 0xFF, (h3 >> 16) & 0xFF, (h3 >> 24) & 0xFF
    ];
  };

  /**
   * @method array
   * @memberof Md5
   * @instance
   * @description Output hash as bytes array
   * @returns {
    
    Array} Bytes array
   * @see {
    
    @link md5.array}
   * @example
   * hash.array();
   */
  Md5.prototype.array = Md5.prototype.digest;

  /**
   * @method arrayBuffer
   * @memberof Md5
   * @instance
   * @description Output hash as ArrayBuffer
   * @returns {
    
    ArrayBuffer} ArrayBuffer
   * @see {
    
    @link md5.arrayBuffer}
   * @example
   * hash.arrayBuffer();
   */
  Md5.prototype.arrayBuffer = function () {
    
    
    this.finalize();

    var buffer = new ArrayBuffer(16);
    var blocks = new Uint32Array(buffer);
    blocks[0] = this.h0;
    blocks[1] = this.h1;
    blocks[2] = this.h2;
    blocks[3] = this.h3;
    return buffer;
  };

  /**
   * @method buffer
   * @deprecated This maybe confuse with Buffer in node.js. Please use arrayBuffer instead.
   * @memberof Md5
   * @instance
   * @description Output hash as ArrayBuffer
   * @returns {
    
    ArrayBuffer} ArrayBuffer
   * @see {
    
    @link md5.buffer}
   * @example
   * hash.buffer();
   */
  Md5.prototype.buffer = Md5.prototype.arrayBuffer;

  /**
   * @method base64
   * @memberof Md5
   * @instance
   * @description Output hash as base64 string
   * @returns {
    
    String} base64 string
   * @see {
    
    @link md5.base64}
   * @example
   * hash.base64();
   */
  Md5.prototype.base64 = function () {
    
    
    var v1, v2, v3, base64Str = '', bytes = this.array();
    for (var i = 0; i < 15;) {
    
    
      v1 = bytes[i++];
      v2 = bytes[i++];
      v3 = bytes[i++];
      base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] +
        BASE64_ENCODE_CHAR[(v1 << 4 | v2 >>> 4) & 63] +
        BASE64_ENCODE_CHAR[(v2 << 2 | v3 >>> 6) & 63] +
        BASE64_ENCODE_CHAR[v3 & 63];
    }
    v1 = bytes[i];
    base64Str += BASE64_ENCODE_CHAR[v1 >>> 2] +
      BASE64_ENCODE_CHAR[(v1 << 4) & 63] +
      '==';
    return base64Str;
  };

  var exports = createMethod();

  if (COMMON_JS) {
    
    
    module.exports = exports;
  } else {
    
    
    /**
     * @method md5
     * @description Md5 hash function, export to global in browsers.
     * @param {
    
    String|Array|Uint8Array|ArrayBuffer} message message to hash
     * @returns {
    
    String} md5 hashes
     * @example
     * md5(''); // d41d8cd98f00b204e9800998ecf8427e
     * md5('The quick brown fox jumps over the lazy dog'); // 9e107d9d372bb6826bd81d3542a419d6
     * md5('The quick brown fox jumps over the lazy dog.'); // e4d909c290d0fb1ca068ffaddf22cbd0
     *
     * // It also supports UTF-8 encoding
     * md5('中文'); // a7bac2239fcdcb3a067903d8077c4a07
     *
     * // It also supports byte `Array`, `Uint8Array`, `ArrayBuffer`
     * md5([]); // d41d8cd98f00b204e9800998ecf8427e
     * md5(new Uint8Array([])); // d41d8cd98f00b204e9800998ecf8427e
     */
    root.md5 = exports;
    if (AMD) {
    
    
      define(function () {
    
    
        return exports;
      });
    }
  }
})();

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Origin blog.csdn.net/weixin_42919342/article/details/129789576