h5 或者小程序中使用 MD5 和 base- 64 加密的处理的代码分享

小鱼儿 2022-03-26 01:16 665阅读 0赞

MD5 和 base64 可以用来简单的加密数据；

抛开其他的加密算法的使用，这里分享一下在h5 和微信小程序中使用 MD5 和 base64 加密的实现和代码；

先看看两段代码（来源未知，但亲测可用），第一个 MD5 的 js 实现，第二个 base64 的 js实现；

第一个： base64 的实现

代码：

base64Transform() {
      // private property  
      var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
    
      this.encode = function (input) {
          var output = "";
          var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
          var i = 0;
          input = _utf8_encode(input);
          while (i < input.length) {
              chr1 = input.charCodeAt(i++);
              chr2 = input.charCodeAt(i++);
              chr3 = input.charCodeAt(i++);
              enc1 = chr1 >> 2;
              enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
              enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
              enc4 = chr3 & 63;
              if (isNaN(chr2)) {
                  enc3 = enc4 = 64;
              } else if (isNaN(chr3)) {
                  enc4 = 64;
              }
              output = output +
                  _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
                  _keyStr.charAt(enc3) + _keyStr.charAt(enc4);
          }
          return output;
      }
    
      this.decode = function (input) {
          var output = "";
          var chr1, chr2, chr3;
          var enc1, enc2, enc3, enc4;
          var i = 0;
          input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
          while (i < input.length) {
              enc1 = _keyStr.indexOf(input.charAt(i++));
              enc2 = _keyStr.indexOf(input.charAt(i++));
              enc3 = _keyStr.indexOf(input.charAt(i++));
              enc4 = _keyStr.indexOf(input.charAt(i++));
              chr1 = (enc1 << 2) | (enc2 >> 4);
              chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
              chr3 = ((enc3 & 3) << 6) | enc4;
              output = output + String.fromCharCode(chr1);
              if (enc3 != 64) {
                  output = output + String.fromCharCode(chr2);
              }
              if (enc4 != 64) {
                  output = output + String.fromCharCode(chr3);
              }
          }
          output = _utf8_decode(output);
          return output;
      }
    
      var _utf8_encode = function (string) {
          string = string.replace(/\r\n/g, "\n");
          var utftext = "";
          for (var n = 0; n < string.length; n++) {
              var c = string.charCodeAt(n);
              if (c < 128) {
                  utftext += String.fromCharCode(c);
              } else if ((c > 127) && (c < 2048)) {
                  utftext += String.fromCharCode((c >> 6) | 192);
                  utftext += String.fromCharCode((c & 63) | 128);
              } else {
                  utftext += String.fromCharCode((c >> 12) | 224);
                  utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                  utftext += String.fromCharCode((c & 63) | 128);
              }
    
          }
          return utftext;
      }
    
      var _utf8_decode = function (utftext) {
          var string = "";
          var i = 0;
          var c = c1 = c2 = 0;
          while (i < utftext.length) {
              c = utftext.charCodeAt(i);
              if (c < 128) {
                  string += String.fromCharCode(c);
                  i++;
              } else if ((c > 191) && (c < 224)) {
                  c2 = utftext.charCodeAt(i + 1);
                  string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                  i += 2;
              } else {
                  c2 = utftext.charCodeAt(i + 1);
                  c3 = utftext.charCodeAt(i + 2);
                  string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                  i += 3;
              }
          }
          return string;
      }
    }

使用方法： （小程序中也可使用）

var base = new this.base64Transform();    //  先创建一个对象实例
    
    var result = base.encode(paramsString)    //  将字符串 paramsString 转成base64 ,result  就是 
                                              //  我们需要的结果；
    
        或者
    
    let base = new this.base64Transform();
    
    let result = base.encode(paramsString)

第二个： MD5的 js 实现

代码：

md5Transform( param ) {
            
            // 给字符串对象增加一个MD5的方法
            String.prototype.MD5 = function (bit) {
                var sMessage = this;
                function RotateLeft(lValue, iShiftBits) { return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits)); }
                function AddUnsigned(lX, lY) {
                    var lX4, lY4, lX8, lY8, lResult;
                    lX8 = (lX & 0x80000000);
                    lY8 = (lY & 0x80000000);
                    lX4 = (lX & 0x40000000);
                    lY4 = (lY & 0x40000000);
                    lResult = (lX & 0x3FFFFFFF) + (lY & 0x3FFFFFFF);
                    if (lX4 & lY4) return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
                    if (lX4 | lY4) {
                        if (lResult & 0x40000000) return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
                        else return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
                    } else return (lResult ^ lX8 ^ lY8);
                }
                function F(x, y, z) { return (x & y) | ((~x) & z); }
                function G(x, y, z) { return (x & z) | (y & (~z)); }
                function H(x, y, z) { return (x ^ y ^ z); }
                function I(x, y, z) { return (y ^ (x | (~z))); }
                function FF(a, b, c, d, x, s, ac) {
                    a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));
                    return AddUnsigned(RotateLeft(a, s), b);
                }
                function GG(a, b, c, d, x, s, ac) {
                    a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));
                    return AddUnsigned(RotateLeft(a, s), b);
                }
                function HH(a, b, c, d, x, s, ac) {
                    a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));
                    return AddUnsigned(RotateLeft(a, s), b);
                }
                function II(a, b, c, d, x, s, ac) {
                    a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));
                    return AddUnsigned(RotateLeft(a, s), b);
                }
                function ConvertToWordArray(sMessage) {
                    var lWordCount;
                    var lMessageLength = sMessage.length;
                    var lNumberOfWords_temp1 = lMessageLength + 8;
                    var lNumberOfWords_temp2 = (lNumberOfWords_temp1 - (lNumberOfWords_temp1 % 64)) / 64;
                    var lNumberOfWords = (lNumberOfWords_temp2 + 1) * 16;
                    var lWordArray = Array(lNumberOfWords - 1);
                    var lBytePosition = 0;
                    var lByteCount = 0;
                    while (lByteCount < lMessageLength) {
                        lWordCount = (lByteCount - (lByteCount % 4)) / 4;
                        lBytePosition = (lByteCount % 4) * 8;
                        lWordArray[lWordCount] = (lWordArray[lWordCount] | (sMessage.charCodeAt(lByteCount) << lBytePosition));
                        lByteCount++;
                    }
                    lWordCount = (lByteCount - (lByteCount % 4)) / 4;
                    lBytePosition = (lByteCount % 4) * 8;
                    lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition);
                    lWordArray[lNumberOfWords - 2] = lMessageLength << 3;
                    lWordArray[lNumberOfWords - 1] = lMessageLength >>> 29;
                    return lWordArray;
                }
                function WordToHex(lValue) {
                    var WordToHexValue = "", WordToHexValue_temp = "", lByte, lCount;
                    for (lCount = 0; lCount <= 3; lCount++) {
                        lByte = (lValue >>> (lCount * 8)) & 255;
                        WordToHexValue_temp = "0" + lByte.toString(16);
                        WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length - 2, 2);
                    }
                    return WordToHexValue;
                }
                var x = Array();
                var k, AA, BB, CC, DD, a, b, c, d
                var S11 = 7, S12 = 12, S13 = 17, S14 = 22;
                var S21 = 5, S22 = 9, S23 = 14, S24 = 20;
                var S31 = 4, S32 = 11, S33 = 16, S34 = 23;
                var S41 = 6, S42 = 10, S43 = 15, S44 = 21;
                // Steps 1 and 2. Append padding bits and length and convert to words 
                x = ConvertToWordArray(sMessage);
                // Step 3. Initialise 
                a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476;
                // Step 4. Process the message in 16-word blocks 
                for (k = 0; k < x.length; k += 16) {
                    AA = a; BB = b; CC = c; DD = d;
                    a = FF(a, b, c, d, x[k + 0], S11, 0xD76AA478);
                    d = FF(d, a, b, c, x[k + 1], S12, 0xE8C7B756);
                    c = FF(c, d, a, b, x[k + 2], S13, 0x242070DB);
                    b = FF(b, c, d, a, x[k + 3], S14, 0xC1BDCEEE);
                    a = FF(a, b, c, d, x[k + 4], S11, 0xF57C0FAF);
                    d = FF(d, a, b, c, x[k + 5], S12, 0x4787C62A);
                    c = FF(c, d, a, b, x[k + 6], S13, 0xA8304613);
                    b = FF(b, c, d, a, x[k + 7], S14, 0xFD469501);
                    a = FF(a, b, c, d, x[k + 8], S11, 0x698098D8);
                    d = FF(d, a, b, c, x[k + 9], S12, 0x8B44F7AF);
                    c = FF(c, d, a, b, x[k + 10], S13, 0xFFFF5BB1);
                    b = FF(b, c, d, a, x[k + 11], S14, 0x895CD7BE);
                    a = FF(a, b, c, d, x[k + 12], S11, 0x6B901122);
                    d = FF(d, a, b, c, x[k + 13], S12, 0xFD987193);
                    c = FF(c, d, a, b, x[k + 14], S13, 0xA679438E);
                    b = FF(b, c, d, a, x[k + 15], S14, 0x49B40821);
                    a = GG(a, b, c, d, x[k + 1], S21, 0xF61E2562);
                    d = GG(d, a, b, c, x[k + 6], S22, 0xC040B340);
                    c = GG(c, d, a, b, x[k + 11], S23, 0x265E5A51);
                    b = GG(b, c, d, a, x[k + 0], S24, 0xE9B6C7AA);
                    a = GG(a, b, c, d, x[k + 5], S21, 0xD62F105D);
                    d = GG(d, a, b, c, x[k + 10], S22, 0x2441453);
                    c = GG(c, d, a, b, x[k + 15], S23, 0xD8A1E681);
                    b = GG(b, c, d, a, x[k + 4], S24, 0xE7D3FBC8);
                    a = GG(a, b, c, d, x[k + 9], S21, 0x21E1CDE6);
                    d = GG(d, a, b, c, x[k + 14], S22, 0xC33707D6);
                    c = GG(c, d, a, b, x[k + 3], S23, 0xF4D50D87);
                    b = GG(b, c, d, a, x[k + 8], S24, 0x455A14ED);
                    a = GG(a, b, c, d, x[k + 13], S21, 0xA9E3E905);
                    d = GG(d, a, b, c, x[k + 2], S22, 0xFCEFA3F8);
                    c = GG(c, d, a, b, x[k + 7], S23, 0x676F02D9);
                    b = GG(b, c, d, a, x[k + 12], S24, 0x8D2A4C8A);
                    a = HH(a, b, c, d, x[k + 5], S31, 0xFFFA3942);
                    d = HH(d, a, b, c, x[k + 8], S32, 0x8771F681);
                    c = HH(c, d, a, b, x[k + 11], S33, 0x6D9D6122);
                    b = HH(b, c, d, a, x[k + 14], S34, 0xFDE5380C);
                    a = HH(a, b, c, d, x[k + 1], S31, 0xA4BEEA44);
                    d = HH(d, a, b, c, x[k + 4], S32, 0x4BDECFA9);
                    c = HH(c, d, a, b, x[k + 7], S33, 0xF6BB4B60);
                    b = HH(b, c, d, a, x[k + 10], S34, 0xBEBFBC70);
                    a = HH(a, b, c, d, x[k + 13], S31, 0x289B7EC6);
                    d = HH(d, a, b, c, x[k + 0], S32, 0xEAA127FA);
                    c = HH(c, d, a, b, x[k + 3], S33, 0xD4EF3085);
                    b = HH(b, c, d, a, x[k + 6], S34, 0x4881D05);
                    a = HH(a, b, c, d, x[k + 9], S31, 0xD9D4D039);
                    d = HH(d, a, b, c, x[k + 12], S32, 0xE6DB99E5);
                    c = HH(c, d, a, b, x[k + 15], S33, 0x1FA27CF8);
                    b = HH(b, c, d, a, x[k + 2], S34, 0xC4AC5665);
                    a = II(a, b, c, d, x[k + 0], S41, 0xF4292244);
                    d = II(d, a, b, c, x[k + 7], S42, 0x432AFF97);
                    c = II(c, d, a, b, x[k + 14], S43, 0xAB9423A7);
                    b = II(b, c, d, a, x[k + 5], S44, 0xFC93A039);
                    a = II(a, b, c, d, x[k + 12], S41, 0x655B59C3);
                    d = II(d, a, b, c, x[k + 3], S42, 0x8F0CCC92);
                    c = II(c, d, a, b, x[k + 10], S43, 0xFFEFF47D);
                    b = II(b, c, d, a, x[k + 1], S44, 0x85845DD1);
                    a = II(a, b, c, d, x[k + 8], S41, 0x6FA87E4F);
                    d = II(d, a, b, c, x[k + 15], S42, 0xFE2CE6E0);
                    c = II(c, d, a, b, x[k + 6], S43, 0xA3014314);
                    b = II(b, c, d, a, x[k + 13], S44, 0x4E0811A1);
                    a = II(a, b, c, d, x[k + 4], S41, 0xF7537E82);
                    d = II(d, a, b, c, x[k + 11], S42, 0xBD3AF235);
                    c = II(c, d, a, b, x[k + 2], S43, 0x2AD7D2BB);
                    b = II(b, c, d, a, x[k + 9], S44, 0xEB86D391);
                    a = AddUnsigned(a, AA); b = AddUnsigned(b, BB); c = AddUnsigned(c, CC); d = AddUnsigned(d, DD);
                }
                if (bit == 32) {
                    return WordToHex(a) + WordToHex(b) + WordToHex(c) + WordToHex(d);
                }
                else {
                    return WordToHex(b) + WordToHex(c);
                }
            }
            return String(param).MD5(32);
        }

使用方法：

这段代码外面有一个 md5Transform( para )\{ \} 函数，这个外壳可以不用，去掉，我们直接使用里面的代码即可；

代码给字符对象拓展了一个 MD5 的方法；

现在假设有一个变量   abc = "12345";

那么   return   abc.MD5(32)  即可返回 12345 的MD5加密的值；

我在上述代码外包了一个函数 md5Transform ，然后再函数的结尾  return 参数 param 的MD5的加密结果；

这样，这个函数的返回值就是我们传递进去的参数的MD5 的加密值；