C#、Java和JS实现SHA256+BASE64加密总结

C#、Java和JS实现SHA256+BASE64加密总结

--莫非(www.muphy.me)

原理

首先，通过编码格式（UTF-8、ASCII等，如果含有汉字等字符，编码格式不同加密结果也不同）获得加密字符串的字节数组，再计算字节数组的哈希值数组，再把hash数组转换为base64编码的字符串。

C#实例

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class  Program

   {//转换为base64编码为44位

       public  static  string NewSHA256(string  str)

       {

           //如果str有中文，不同Encoding的sha是不同的！！

          using  (SHA256Managed  sha256 = new SHA256Managed())

           {

              byte[] SHA256Data  =Encoding.UTF8.GetBytes(str);

//SHA256Data  "104,101,108,108,111,32,119,111,114,108,100"

              byte[] by  =sha256.ComputeHash(SHA256Data);

//44位 "uU0nuZNNPgilLlLX2n2r+sSE7+N6U4DukIj3rOLvzek="

               return  Convert.ToBase64String(by);  

           }

       }

       //转换为十六进制编码为64位  去除了‘-’

       public  static  string SHA256(string  str)

       { //如果str有中文，不同Encoding的sha是不同的！！

          using  (SHA256Managed  sha256 = new SHA256Managed())

           {

              byte[] SHA256Data  =Encoding.UTF8.GetBytes(str);

//SHA256Data "104,101,108,108,111,32,119,111,114,108,100"

              byte[] by  =sha256.ComputeHash(SHA256Data);

//64位 "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"

               return  BitConverter.ToString(by).Replace("-", "").ToLower();

           }

       }

       static  void Main(string[] args)

       {

          string  s  = "hello world";

//sha265：b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9

          string  sha  = SHA256(s);

          Console.WriteLine("{0}\n{1} \nLength: {2}", s, sha,sha.Length);

          //结果 ”uU0nuZNNPgilLlLX2n2r+sSE7+N6U4DukIj3rOLvzek=”

       }

}
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Java实例

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/**

    *  利用java原生的摘要实现SHA256加密

    *@param  str  加密后的报文

    *@return

    */

   public  static  String getSHA256StrJava(String  str){

      MessageDigest  messageDigest;

       String  encodeStr = "";

       try  {

          messageDigest  =MessageDigest.getInstance("SHA-256");

          messageDigest.update(str.getBytes("UTF-8"));

           //转换的方式选择

           //encodeStr  = byte2Hex(messageDigest.digest());//转换成二进制

          encodeStr  =base64Entrypt(messageDigest.digest());//转换成Base64

       } catch  (NoSuchAlgorithmException  e) {

          e.printStackTrace();

       } catch  (UnsupportedEncodingException  e) {

          e.printStackTrace();

       }

       return  encodeStr;

   }

   /**

    *将byte转为16进制

    *@param  bytes

    *@return

    */

   private  static  String byte2Hex(byte[] bytes){

       StringBuffer  stringBuffer = new StringBuffer();

       String  temp  =null;

       for  (int i=0;i<bytes.length;i++){

          temp  =Integer.toHexString(bytes[i] & 0xFF);

           if  (temp.length()==1){

               //1得到一位的进行补0操作

               stringBuffer.append("0");

           }

          stringBuffer.append(temp);

       }

       return  stringBuffer.toString();

}

/**

    *转换为BASE64编码

    *@param  bytes

    *@return

    */

   private  static  String base64Entrypt(byte[] bytes){

   //import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;

   return  Base64.encode(bytes);

   }

   private  static  String newBase64Entrypt(byte[] bytes){

        //import sun.misc.BASE64Encoder;

        return  new  BASE64Encoder().encode(bytes);

   }

   /**

    *测试

    *@param  Args

    */

   public  static  void main(String[] Args){

   String str  = "hello  world";

   String sha  = getSHA256StrJava(str);

   System.out.println(str  + ":" + sha);

   //结果：hello world:uU0nuZNNPgilLlLX2n2r+sSE7+N6U4DukIj3rOLvzek=

}
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JS实例

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/**

*SHA256加密

*/

function  SHA256(s) {

 var  chrsz = 8;

 var  hexcase = 0;

 function  safe_add(x, y) {

     var  lsw  =(x  & 0xFFFF) + (y  & 0xFFFF);

     var  msw  =(x  >> 16) + (y  >> 16) + (lsw  >> 16);

     return  (msw << 16) | (lsw  &0xFFFF);

 }

 function  S(X, n) {

     return  (X >>> n) | (X  <<(32  - n));

 }

 function  R(X, n) {

     return  (X >>> n);

 }

 function  Ch(x, y, z) {

     return  ((x & y) ^ ((~x) & z));

 }

 function  Maj(x, y, z) {

     return  ((x & y) ^ (x  & z) ^ (y  & z));

 }

 function  Sigma0256(x) {

     return  (S(x, 2) ^ S(x, 13) ^ S(x, 22));

 }

 function  Sigma1256(x) {

     return  (S(x, 6) ^ S(x, 11) ^ S(x, 25));

 }

 function  Gamma0256(x) {

     return  (S(x, 7) ^ S(x, 18) ^ R(x, 3));

 }

 function  Gamma1256(x) {

     return  (S(x, 17) ^ S(x, 19) ^ R(x, 10));

 }

 function  core_sha256(m, l) {

     var  K  = new  Array(0x428A2F98, 0x71374491, 0xB5C0FBCF,0xE9B5DBA5,

             0x3956C25B, 0x59F111F1, 0x923F82A4,0xAB1C5ED5, 0xD807AA98,

             0x12835B01, 0x243185BE,0x550C7DC3, 0x72BE5D74, 0x80DEB1FE,

             0x9BDC06A7, 0xC19BF174,0xE49B69C1, 0xEFBE4786, 0xFC19DC6,

             0x240CA1CC, 0x2DE92C6F,0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,

             0x983E5152, 0xA831C66D, 0xB00327C8,0xBF597FC7, 0xC6E00BF3,

             0xD5A79147, 0x6CA6351, 0x14292967,0x27B70A85, 0x2E1B2138,

             0x4D2C6DFC, 0x53380D13,0x650A7354, 0x766A0ABB, 0x81C2C92E,

             0x92722C85, 0xA2BFE8A1,0xA81A664B, 0xC24B8B70, 0xC76C51A3,

             0xD192E819, 0xD6990624, 0xF40E3585,0x106AA070, 0x19A4C116,

             0x1E376C08, 0x2748774C,0x34B0BCB5, 0x391C0CB3, 0x4ED8AA4A,

             0x5B9CCA4F, 0x682E6FF3,0x748F82EE, 0x78A5636F, 0x84C87814,

             0x8CC70208, 0x90BEFFFA,0xA4506CEB, 0xBEF9A3F7, 0xC67178F2);

     var  HASH  =new  Array(0x6A09E667,0xBB67AE85, 0x3C6EF372, 0xA54FF53A,

             0x510E527F, 0x9B05688C,0x1F83D9AB, 0x5BE0CD19);

     var  W  = new  Array(64);

     var  a, b, c, d, e, f, g, h, i, j;

     var  T1, T2;

     m[l >> 5] |= 0x80  <<(24  - l % 32);

     m[((l + 64  >> 9) << 4) +15] = l;

     for  (var  i  = 0;i  < m.length; i  += 16) {

         a = HASH[0];

         b = HASH[1];

         c = HASH[2];

         d = HASH[3];

         e = HASH[4];

         f = HASH[5];

         g = HASH[6];

         h = HASH[7];

         for  (var  j  = 0;j  < 64; j++) {

             if  (j < 16)

                 W[j] = m[j  + i];

             else

                 W[j] =safe_add(safe_add(safe_add(Gamma1256(W[j - 2]),

                         W[j  - 7]), Gamma0256(W[j  - 15])), W[j - 16]);

             T1 = safe_add(safe_add(safe_add(safe_add(h, Sigma1256(e)), Ch(

                     e, f, g)), K[j]), W[j]);

             T2 = safe_add(Sigma0256(a), Maj(a, b, c));

             h = g;

             g = f;

             f = e;

             e = safe_add(d, T1);

             d = c;

             c = b;

             b = a;

             a = safe_add(T1, T2);

         }

         HASH[0] = safe_add(a, HASH[0]);

         HASH[1] = safe_add(b, HASH[1]);

         HASH[2] = safe_add(c, HASH[2]);

         HASH[3] = safe_add(d, HASH[3]);

         HASH[4] = safe_add(e, HASH[4]);

         HASH[5] = safe_add(f, HASH[5]);

         HASH[6] = safe_add(g, HASH[6]);

         HASH[7] = safe_add(h, HASH[7]);

     }

     return  HASH;

 }

 function  str2binb(str) {

     var  bin  =Array();

     var  mask  =(1  << chrsz) - 1;

     for  (var  i  = 0;i  < str.length  * chrsz; i += chrsz) {

         bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - i  % 32);

     }

     return  bin;

 }

 function  Utf8Encode(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;

 }

 function  binb2hex(binarray) {

     var  hex_tab = hexcase  ? "0123456789ABCDEF" : "0123456789abcdef";

     var  str  = "";

     for  (var  i  = 0;i  < binarray.length  * 4; i++) {

         str += hex_tab

                 .charAt((binarray[i  >> 2] >> ((3  - i  %4) * 8  + 4)) & 0xF)

                 + hex_tab.charAt((binarray[i>> 2] >> ((3 - i % 4) * 8)) & 0xF);

     }

     return  str;

 }

 s  =Utf8Encode(s);

 return  binb2hex(core_sha256(str2binb(s), s.length *chrsz));

}
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