java MD5 加密

下面是一个简单的java MD5加密算法。

/** MD5 encrypt algorithm*/

public class MD5{

       public static String encryptTo32(String input){

              MessageDigest digest = MessageDigest.getInstance("MD5");

              byte[] ciphertext = digest.digest(input.getBytes());

            

             //convert 8 bytes cipher text to 16 bytes cipher text

            int temp; StringBuilder builder = new StringBuilder(32);

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

                   temp = ciphertext[i];

                   if(temp < 0){

                    temp += 256;

                   }

                   if(temp<16){

                    builder.append("0"); 

                   }

                   builder.append(Integer.toHexString(temp));

              }

              return builder.toString();

      }

public static String encryptTo16(String input){

      encryptTo32(input).subString(8,24);

}

}