java的加密解密

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1、bytealgorithm加密string解密importimportjava.security.InvalidKeyException;importjava.security.NoSuchAlgorithmException;importjava.security.SecureRandom;importjava.security.spec.InvalidKeySpecException;importjavax.crypto.BadPaddingException;importjavax.crypto.Cipher;importjav

2、ax.crypto.IllegalBlockSizeException;importjavax.crypto.KeyGenerator;importjavax.crypto.NoSuchPaddingException;importjavax.crypto.SecretKey;importjavax.crypto.SecretKeyFactory;importjavax.crypto.spec.DESKeySpec;publicclassDESEncryptTest{privatestaticfinalStringDES_ALGORI

3、THM="DES";/***DES加密*@paramplainData*@paramsecretKey*@return*@throwsException*/publicStringencryption(StringplainData,StringsecretKey)throwsException{Ciphercipher=null;try{cipher=Cipher.getInstance(DES_ALGORITHM);cipher.init(Cipher.ENCRYPT_MODE,generateKey(secretKey));}c

4、atch(NoSuchAlgorithmExceptione){e.printStackTrace();}catch(NoSuchPaddingExceptione){e.printStackTrace();}catch(InvalidKeyExceptione){}try{//为了防止解密时报javax.crypto.IllegalBlockSizeException:Inputlengthmustbemultipleof8whendecryptingwithpaddedcipher异常，//不能把加密后的字节数组直接转换成字符串b

5、yte[]buf=cipher.doFinal(plainData.getBytes());returnBase64Utils.encode(buf);}catch(IllegalBlockSizeExceptione){e.printStackTrace();thrownewException("IllegalBlockSizeException",e);}catch(BadPaddingExceptione){e.printStackTrace();thrownewException("BadPaddingException",e

6、);}}/***DES解密*@paramsecretData*@paramsecretKey*@return*@throwsException*/publicStringdecryption(StringsecretData,StringsecretKey)throwsException{Ciphercipher=null;try{cipher=Cipher.getInstance(DES_ALGORITHM);cipher.init(Cipher.DECRYPT_MODE,generateKey(secretKey));}catch

7、(NoSuchAlgorithmExceptione){e.printStackTrace();thrownewException("NoSuchAlgorithmException",e);}catch(NoSuchPaddingExceptione){e.printStackTrace();thrownewException("NoSuchPaddingException",e);}catch(InvalidKeyExceptione){e.printStackTrace();thrownewException("InvalidK

8、eyException",e);}try{byte[]buf=cipher.doFinal(Base64Utils.decode(secretData.toCharArray()));returnnewString(bu