Java Base64, AES, SHA1, MD5 encryption algorithms

package com.example.decript; import java.io.unsupportedencodingexception;import  java.security.invalidkeyexception;import java.security.messagedigest;import  java.security.nosuchalgorithmexception;import java.security.securerandom;import  javax.crypto.badpaddingexception;import javax.crypto.cipher;import  javax.crypto.illegalblocksizeexception;import javax.crypto.keygenerator;import  javax.crypto.nosuchpaddingexception;import javax.crypto.secretkey;import  javax.crypto.spec.secretkeyspec; public class decripttest {      PUBLIC&NBSP;STATIC&NBSP;STRING&NBSP;SHA1 (String decript)  {         try {            MessageDigest  digest = java.security.messagedigest                  &Nbsp;  .getinstance ("SHA-1");             digest.update (Decript.getbytes ());             byte messagedigest[] = digest.digest ();             // Create Hex String             stringbuffer hexstring = new stringbuffer ();             //  byte array converted to   hexadecimal   number              for  (int i = 0; i <  messagedigest.length; i++)  {                 string shahex = integer.tohexstring (messagedigest[i] &  0xFF);                 if  (ShaHex.length ()  < 2)  {                     hexstring.append (0);                 }                 hexstring.append (Shahex);             }             return hexstring.tostring ();          } catch  (Nosuchalgorithmexception e)  {            e.printstacktrace ();         }        return  "";     }     public static string sha (String decript)  {         try {             MessageDigest digest = java.security.MessageDigest                     .getinstance ("SHA");             digest.update (Decript.getBytes ());             byte messageDigest[] =  Digest.digest ();            // create  hex string            stringbuffer  Hexstring = new stringbuffer ();             //  byte array conversion to   hex &NBSP; number             for  (int i =  0; i < messagedigest.length; i++)  {                 string shahex = integer.tohexstring ( MESSAGEDIGEST[I]&NBSP;&AMP;&NBSP;0XFF);                 if  (Shahex.length ()  < 2)  {                     hexstring.append (0);                 }                 hexstring.append (SHAHEX);             }              return hexstring.tostring ();          } catch   (nosuchalgorithmexception e)  {             e.printstacktrace ();        }         return  "";    }     public  STATIC&NBSP;STRING&NBSP;MD5 (string input)  {        try  {            //  obtaining the  messagedigest of MD5 Digest algorithm   Object             messagedigest mdinst  = messagedigest.getinstance ("MD5");             //  Update summary with the specified bytes              Mdinst.update (Input.getbytes ());             //  Get ciphertext              byte[] md = mdinst.digest ();             //  convert ciphertext to 16 binary string form              stringbuffer hexstring = new stringbuffer ();             //  byte array converted to   hexadecimal   number              for  (int i = 0; i <  md.length; i++)  {                 string shahex = integer.tohexstring (MD[I]&NBSP;&AMP;&NBSP;0XFF);                 if  ( Shahex.length ()  < 2)  {                     hexstring.append (0);                 }                 hexstring.append (Shahex);            }             return hexstring.tostring ();         } catch  (nosuchalgorithmexception e)  {             e.printstacktrace ();         }        return  "";     }     /**     *  Encryption      *      *  @param   content     *              content that needs to be encrypted      *  @param   password      *             Encryption Password       *  @return       */    public  static byte[] encryptaes (String content, string password)  {         try {             keygenerator kgen = keygenerator.getinstance ("AES");             kgen.init (128, new securerandom (Password.getBytes ()));             SecretKey secretKey =  Kgen.generatekey ();             byte[] encodeformat =  Secretkey.getencoded ();             secretkeyspec  key = new secretkeyspec (encodeformat,  "AES");             cipher cipher = cipher.getinstance ("AES");//  Creating a cipher             byte[] byteContent =  Content.getbytes ("Utf-8");             cipher.init ( Cipher.encrypt_mode, key);//  Initialization              byte[] result = cipher.dofinal (bytecontent);             return result; //  Encryption          } catch  (NOSUCHALGORITHMEXCEPtion e)  {            e.printstacktrace () ;        } catch  (nosuchpaddingexception e)  {             e.printstacktrace ();         } catch  (invalidkeyexception e)  {             e.printstacktrace ();         } catch  (unsupportedencodingexception e)  {             e.printstacktrace ();         } catch   (illegalblocksizeexception e)  {             e.printstacktrace ();        } catch  ( Badpaddingexception e)   {            e.printstacktrace ();         }        return null;     }     /**     *  decryption       *     *  @param   content     *              What to decrypt      *   @param   password     *              decryption keys      *  @return      */     public static byte[] decryptaes (byte[] content, string  Password)  {        try {              keygenerator kgen = keygenerator.getinstance ("AES");             kgen.init (128, new securerandom (Password.getBytes ()));             SecretKey secretKey =  Kgen.generatekey ();            byte[]  encodeformat = secretkey.getencoded ();             secretkeyspec key = new secretkeyspec (encodeformat,  "AES");             cipher cipher = cipher.getinstance ( "AES");//  Create the cipher             cipher.init ( Cipher.decrypt_mode, key);//  Initialization              byte[] result = cipHer.dofinal (content);            return  result; //  Encryption         } catch  ( Nosuchalgorithmexception e)  {             e.printstacktrace ();        } catch  ( Nosuchpaddingexception e)  {             E.printstacktrace ();        } catch  (InvalidKeyException  e)  {            e.printstacktrace ();         } catch  (illegalblocksizeexception e)  {             e.printstacktrace ();         } catch  (badpaddingexception e)  {            e.printstacktrace ();         }        return  Null;    }     /**     * base64 decryption      *     *  @param  key      *  @return      *  @throws  exception     * /    public static string decryptbase64 (String key)  {          return  "";    }     &NBSP;/**&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;*&NBSP;BASE64 Encryption      *      *  @param  key     *  @return      * @ Throws exception&nbSp;    */    public static string encryptbase64 (String  key)  {         return  ";     }}

Java Base64, AES, SHA1, MD5 encryption algorithm