descbc算法java版

descbc算法java版

import javax.crypto.Cipher;  import javax.crypto.SecretKey;  import javax.crypto.SecretKeyFactory;  import javax.crypto.spec.*;  import sun.misc.*;  /**  * DES encryption algorithm, providing the encryption and decryption algorithm  * for byte array and string  *   * @author : Yao (WICT)  * @version 1.0  */  public class CryptionData {      // The length of Encryptionstring should be 8 bytes and not be      // a weak key      private String EncryptionString;      // The initialization vector should be 8 bytes      private final byte[] EncryptionIV = { 0x11, 0x22, 0x4F, 0x58, (byte) 0x88,              0x10, 0x40, 0x38, 0x28, 0x25, 0x79, 0x51, (byte) 0xCB, (byte) 0xDD,              0x55, 0x66, 0x77, 0x29, 0x74, (byte) 0x98, 0x30, 0x40, 0x36,              (byte) 0xE2 };  //初始化向量    private final static String DES = "DES/CBC/PKCS5Padding";  //DES模式    /**      * Saving key for encryption and decryption      *       * @param EncryptionString      *            String      */      public CryptionData(String EncryptionString) {          this.EncryptionString = EncryptionString;      }      /**      * Encrypt a byte array      *       * @param SourceData      *            byte[]      * @throws Exception      * @return byte[]      */      public byte[] EncryptionByteData(byte[] SourceData) throws Exception {          byte[] retByte = null;          // Create SecretKey object          byte[] EncryptionByte = EncryptionString.getBytes();//明文转为byte          DESKeySpec dks = new DESKeySpec(EncryptionByte);//声明一个具体加密构造器的特别密钥special key        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); //声明了一个DES的密钥工厂         SecretKey securekey = keyFactory.generateSecret(dks); //密钥生成器产生真正的DES密钥         // Create IvParameterSpec object with initialization vector          IvParameterSpec spec = new IvParameterSpec(EncryptionIV);          // Create Cipter object          Cipher cipher = Cipher.getInstance(DES);          // Initialize Cipher object          cipher.init(Cipher.ENCRYPT_MODE, securekey, spec); //初始化加密构造器         // Encrypting data          retByte = cipher.doFinal(SourceData);  //完成加密        return retByte;  //返回加密的byte    }      /**      * Decrypt a byte array      *       * @param SourceData      *            byte[]      * @throws Exception      * @return byte[]      */      public byte[] DecryptionByteData(byte[] SourceData) throws Exception {          byte[] retByte = null;          // Create SecretKey object          byte[] EncryptionByte = EncryptionString.getBytes();          DESKeySpec dks = new DESKeySpec(EncryptionByte);          SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");          SecretKey securekey = keyFactory.generateSecret(dks);          // Create IvParameterSpec object with initialization vector          IvParameterSpec spec = new IvParameterSpec(EncryptionIV);          // Create Cipter object          Cipher cipher = Cipher.getInstance(DES);          // Initialize Cipher object          cipher.init(Cipher.DECRYPT_MODE, securekey, spec);          // Decrypting data          retByte = cipher.doFinal(SourceData);          return retByte;      }      /**      * Encrypt a string      *       * @param SourceData      *            String      * @throws Exception      * @return String      */      public String EncryptionStringData(String SourceData) throws Exception {          String retStr = null;          byte[] retByte = null;          // Transform SourceData to byte array          byte[] sorData = SourceData.getBytes();          // Encrypte data          retByte = EncryptionByteData(sorData);          // Encode encryption data          BASE64Encoder be = new BASE64Encoder();          retStr = be.encode(retByte); //以base64编码保存密文         return retStr;      }      /**      * Decrypt a string      *       * @param SourceData      *            String      * @throws Exception      * @return String      */      public String DecryptionStringData(String SourceData) throws Exception {          String retStr = null;          byte[] retByte = null;          // Decode encryption data          BASE64Decoder bd = new BASE64Decoder();          byte[] sorData = bd.decodeBuffer(SourceData);          // Decrypting data          retByte = DecryptionByteData(sorData);          retStr = new String(retByte);          return retStr;      }