package jct;import javax.crypto.*;import javax.crypto.spec.*;import java.security.Key;import java.security.KeyFactory;import java.security.spec.EncodedKeySpec;import java.security.Security;import java.security.*;import java.util.Random;import java.util.Vector;/** * <p>封裝同Blowfish對稱加密算法有關的方法，包括了使用創建Blowfish密碼，使用Blowfish加密、解密, 使用PBE(基于口令的加密)存取blowfiwsh密碼 </p> * @Copyright:WDSsoft * @ad:WDSsoft “企業多級數字簽名系統”- 最佳的企業電子文檔多級數字簽名方案 * @URL:www.wdssoft.com * @作者 吳東升 mdss@wdssoft.com bluesunday@sohu.com */public class BlowfishTool {  public BlowfishTool() {  }/** * 使用Blowfish加密 * @param Key key:密碼 * @param byte[] text:明文 * @return byte[]:密文 */  public static byte[] encryptReturnByte(Key key,byte[] text){     try{         Cipher cipher=Cipher.getInstance("Blowfish/ECB/PKCS5Padding");         cipher.init(Cipher.ENCRYPT_MODE,key);         return cipher.doFinal(text);     }catch(Exception e){  return null;    }  }/** * Blowfish解密 * @param Key key：密碼 * @param byte[] text：密文 * @return byte[] : 明文 */   public static byte[] decryptReturnByte(Key key,byte[] text){     try{         Cipher cipher=Cipher.getInstance("Blowfish/ECB/PKCS5Padding");         cipher.init(Cipher.DECRYPT_MODE,key);         return cipher.doFinal(text);     }catch(Exception e){  return null;}   }/** * 使用PBE保管Blowfish密碼 * @param Key targetKey: Blowfish密碼 * @param char[] password: 口令 * @return Vector－element1:byte[]:密文-element2:byte[]:鹽 */    public static Vector wrapKey(Key targetKey,char[] password){       try{          PBEKeySpec keySpec=new PBEKeySpec(password);          SecretKeyFactory keyFactory=SecretKeyFactory.getInstance("PBEWithMD5AndDES");          SecretKey key=keyFactory.generateSecret(keySpec);          Cipher cipher=Cipher.getInstance("PBEWithMD5AndDES");          byte[] salt=new byte[8];          Random random=new Random();          random.nextBytes(salt);          PBEParameterSpec paramSpec=new PBEParameterSpec(salt,100);          cipher.init(cipher.WRAP_MODE,key,paramSpec);          Vector encryptedKey=new Vector();          encryptedKey.addElement(cipher.wrap(targetKey));          encryptedKey.addElement(salt);          return encryptedKey;       }catch(Exception e){e.printStackTrace();          return null;        }    }/** * 取出PBE加密的密鑰 * @param Vector encryptedKey－element1:byte[]:密文-element2:byte[]:鹽 * @param char[] password:口令 * @return Key:Blowfish密碼 */  public static Key unwrapKey(Vector encryptedKey,char[] password){      try{          byte[] wrapedKey=(byte[])encryptedKey.elementAt(0);          byte[] salt=(byte[])encryptedKey.elementAt(1);          PBEKeySpec keySpec=new PBEKeySpec(password);          SecretKeyFactory keyFactory=SecretKeyFactory.getInstance("PBEWithMD5AndDES");          SecretKey key=keyFactory.generateSecret(keySpec);          Cipher cipher=Cipher.getInstance("PBEWithMD5AndDES");          PBEParameterSpec paramSpec=new PBEParameterSpec(salt,100);          cipher.init(cipher.UNWRAP_MODE,key,paramSpec);          return cipher.unwrap(wrapedKey,"Blowfish",cipher.SECRET_KEY);    }catch(Exception e){   return null;    }  }  /**   * 產生一個Blowfish密碼   * @return Key Blowfish 密碼   */  public static Key creatKey(){    try{        KeyGenerator keyGenerator=KeyGenerator.getInstance("Blowfish");        keyGenerator.init(128);        Key key=keyGenerator.generateKey();        return key;    }catch(Exception e){return null;}  }/** * 將Blowfish密碼Key 對象轉為byte[] 形式 * @param Key Blowfish密碼Key 對象 * @return byte[]形式Blowfish密碼 */  public static byte[] encodeKey(Key key){      return key.getEncoded();    }/*** 將byte[] 形式Blowfish密碼轉為Key 對象* @param byte[] 形式Blowfish密碼* @return Key Blowfish密碼Key 對象 */  public static Key decodeKey(byte[] keyByteCode){       SecretKeySpec myKey=new SecretKeySpec(keyByteCode,"Blowfish");       return myKey;    }}