AES symmetric encryption algorithm encryption \ Decryption Instance

Package Com.soufun.com;import Java.io.unsupportedencodingexception;import java.security.InvalidKeyException; Import Java.security.nosuchalgorithmexception;import Java.security.securerandom;import Java.util.Date;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;/** * @author WHD Data August 16, 2015 */public class Aesutil {private static final String AES = "AES";p rivate static final String utf8= "UTF-8"; static Keygenerator KGen =null;static{try {kgen= Keygenerator.getinstance (AES);} catch (NoSuchAlgorithmException e) {//TODO auto-generated catch Blocke.printstacktrace ();}} /* * @param content: * @param password: */private static byte[] Encrypt (string content, string password) {try {//Use static code block to Generate Keygenerator object//keygenerator KGen = Keygenerator.getinstance (AES);//Use 128-bit kgen.init (+, new SEcurerandom (Password.getbytes ())); Secretkey Secretkey = Kgen.generatekey (); byte[] Encodeformat = secretkey.getencoded (); Secretkeyspec key = new Secretkeyspec (Encodeformat, AES);//Cipher The object actually completes the cryptographic operation cipher cipher = Cipher.getinstance (AES);// Encrypt content to encode byte[] bytecontent = content.getbytes (UTF8);//use Key to initialize Cipher object Cipher.init (Cipher.encrypt_mode, key);// Formally perform cryptographic operations byte[] result = cipher.dofinal (bytecontent); return result;} 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;} /* * @param content: * @param password: */private static byte[] Decrypt (byte[] content, String password) {try {//Use static code block to Generate Keygenerator object//keygenerator KGen = Keygenerator.getinstance (AES);//Use 128-bit kgen.init (+, new SecurerandoM (Password.getbytes ())); Secretkey Secretkey = Kgen.generatekey (); byte[] Encodeformat = secretkey.getencoded (); Secretkeyspec key = new Secretkeyspec (Encodeformat, AES);//Cipher The object actually completes the cryptographic operation cipher cipher = Cipher.getinstance (AES);// Initialize the Cipher object with a key Cipher.init (Cipher.decrypt_mode, key);//formally perform decryption operation byte[] result = cipher.dofinal (content); return result ;} 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;} /** * binary-"hex conversion * @param buf * @return */private static String parsebyte2hexstr (byte buf[]) {stringbuffer sb = new Stri Ngbuffer (); for (int i = 0; i < buf.length; i++) {String hex = integer.tohexstring (Buf[i] & 0xFF); if (hex.length () = = 1) {hex = ' 0 ' + hex;} Sb.append (Hex.touppercase ());} return sb.tostring ();} /** * hex-Binary conversion * @param hexstr * @retuRN */private static byte[] Parsehexstr2byte (String hexstr) {if (Hexstr.length () < 1) {return null;} Byte[] result = new Byte[hexstr.length ()/2];for (int i = 0; i < hexstr.length ()/2; i++) {int high = Integer.parsein T (hexstr.substring (i * 2, I * 2 + 1), int low = Integer.parseint (Hexstr.substring (i * 2 + 1, I * 2 + 2), +); Result[i] = (byte) (high * + low);} return result;} public static void Main (string[] args) throws Unsupportedencodingexception {long begin=new Date (). GetTime (); String content = "aaades encryption test"; String password = "12345678DD";//Encryption System.out.println ("Before encryption:" + content); byte[] Encryptresult = Encrypt (content, password); String encryptresultstr = Parsebyte2hexstr (Encryptresult); SYSTEM.OUT.PRINTLN ("After encryption:" + ENCRYPTRESULTSTR);//decryption byte[] Decryptfrom = Parsehexstr2byte (ENCRYPTRESULTSTR); byte[] Decryptresult = Decrypt (decryptfrom, password);//Decrypt the contents to decode string result = new String (Decryptresult, UTF8); System.out.println ("After decryption:" + result); Long end= new Date (). GetTime (); SysteM.out.println (End-begin);}} 

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AES symmetric encryption algorithm encryption \ Decryption Instance