des加解密的封装和使用的例子

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1、DES加解密的封装和使用的例子原创：zhouxianli1978@msn.com ,欢迎喜欢Java的网友加我DES加密封装packageorg.jtool.desutils;importjava.security.SecureRandom;importjavax.crypto.*;importjavax.crypto.spec.DESKeySpec;publicclassDESEncrypt{   privatebyte[]desKey;   publicDESEncrypt(byte[]desKey){       this.des

2、Key=desKey;   }   publicbyte[]doEncrypt(byte[]plainText)throwsException{       //     DES算法要求有一个可信任的随机数源       SecureRandomsr=newSecureRandom();       byterawKeyData[]=desKey;/*用某种方法获得密匙数据*/       //从原始密匙数据创建DESKeySpec对象       DESKeySpecdks=newDESKeySpec(rawKeyData);    

3、   //创建一个密匙工厂，然后用它把DESKeySpec转换成       //一个SecretKey对象       SecretKeyFactorykeyFactory=SecretKeyFactory.getInstance("DES");       SecretKeykey=keyFactory.generateSecret(dks);       //Cipher对象实际完成加密操作       Ciphercipher=Cipher.getInstance("DES");       //用密匙初始化Cipher对象  

4、     cipher.init(Cipher.ENCRYPT_MODE,key,sr);       //现在，获取数据并加密       bytedata[]=plainText;/*用某种方法获取数据*/       //正式执行加密操作       byteencryptedData[]=cipher.doFinal(data);       returnencryptedData;   }}DES解密封装packageorg.jtool.desutils;importjava.security.SecureRandom;imp

5、ortjavax.crypto.*;importjavax.crypto.spec.DESKeySpec;publicclassDESDecrypt{   privatebyte[]desKey;   publicDESDecrypt(byte[]desKey){       this.desKey=desKey;   }   publicbyte[]doDecrypt(byte[]encryptText)throwsException{       //     DES算法要求有一个可信任的随机数源       SecureRando

6、msr=newSecureRandom();       byterawKeyData[]=desKey;/*用某种方法获取原始密匙数据*/       //从原始密匙数据创建一个DESKeySpec对象       DESKeySpecdks=newDESKeySpec(rawKeyData);       //创建一个密匙工厂，然后用它把DESKeySpec对象转换成       //一个SecretKey对象       SecretKeyFactorykeyFactory=SecretKeyFactory.getInstance

7、("DES");       SecretKeykey=keyFactory.generateSecret(dks);       //Cipher对象实际完成解密操作       Ciphercipher=Cipher.getInstance("DES");       //用密匙初始化Cipher对象       cipher.init(Cipher.DECRYPT_MODE,key,sr);       //现在，获取数据并解密       byteencryptedData[]=encryptText;/*获得经过加密的数据*/

8、       //正式执行解密操作       bytedecryptedData[]=cipher.doFinal(encryptedData);       returndecryptedData;