AESalgorithm – 解密问题

我已经编写了用于AES解密的代码，但没有任何成功。 我的AES阿尔戈课是在这里。 http://pastebin.com/QtpFnW84和实现是：

String Masterkey = "eX0XcsF8lkeX0XcsF8lkeX0XcsF8lkeX0XcsF8lkeX0XcsF8lk"; try { String s = AES_Algo .decrypt( Masterkey, "LVmDIcmVIuNVPObjLXkVbFc13NCX1Md3DjrvfiioMQHS7QmizT3dlSujgA7NS0zI HEweRWGcwOKpu0wurK495yCTWkJO33X1n+at60xLdJ7ZUreRWN9RatUjRQuLI7Ft kwH7QMTQAYXQizGJ0HrArja8QA/YnkiGpgO0pdmYm9Mb6g/sIXhz1Oeo42uwzTM1 F+t6AM/qrH9ZMozlctU6LQQVIggP8zzmnwvjNCyyYJCsXedOEMcvrpQV100gz+pf cE4RisPgN0IOKzvzepJ88E3VMPCXBv/AV4Z2/fuBcmimzGdvZwKgYM/39TGNBS7t T491knA3ZdMoAnSPFvdM4khfRyM5I9FJpwDxmpykA4VpBUhyd4p+ZS1ZSQ8Zwi3I 5egtoNkSJhI6pjAR7PbzJtJ+VAWCVIdsFP4Kc+KKPBE0HVS5UiQQ+OJjx2r9iMMR OYqeyqMv8xw3Wy7TBMiKnQMCRo5+K1mDabx164+6cfoKk8+6b5WlNfBQVobZpQs2"); Log.e("s", s); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } 

每当我收到exception：

 06-13 05:03:43.013: W/System.err(1757): java.lang.NumberFormatException: unable to parse 'LV' as integer 06-13 05:03:43.043: W/System.err(1757): at java.lang.Integer.parse(Integer.java:433) 06-13 05:03:43.043: W/System.err(1757): at java.lang.Integer.parseInt(Integer.java:422) 06-13 05:03:43.043: W/System.err(1757): at java.lang.Integer.valueOf(Integer.java:704) 06-13 05:03:43.043: W/System.err(1757): at com.caddytips.AES_Algo.toByte(AES_Algo.java:76) 06-13 05:03:43.043: W/System.err(1757): at com.caddytips.AES_Algo.decrypt(AES_Algo.java:32) 

有人可以帮我吗？

提前致谢。

Answer 1

http://android-developers.blogspot.in/2013/02/using-cryptography-to-store-credentials.html

http://developer.android.com/reference/javax/crypto/SecretKeyFactory.html

检查上面的链接。 使用下面的参考。根据您的需要修改以下。

用法

  try { DescEncrypter ec = new DescEncrypter(); byte[] cipherText =ec.encrypt("hi", "hello"); String enc = new String(cipherText,"UTF-8"); String decryp= ec.decrypt("hi", cipherText); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } 

DescEncrypter.java

  import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.PBEKeySpec; import javax.crypto.spec.SecretKeySpec; public class DescEncrypter { public static final int SALT_LENGTH = 20; public static final int PBE_ITERATION_COUNT = 200; //1024; private static final String PBE_ALGORITHM = "PBEWithSHA256And256BitAES-CBC-BC"; //algoritmo / modo / relleno private static final String CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding"; byte[] iv = "1234567890asdfgh".getBytes(); byte[] salt = "dfghjklpoiuytgftgyhj".getBytes(); public byte[] encrypt(String password, String cleartext) { byte[] encryptedText = null; try { PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray(), salt, PBE_ITERATION_COUNT, 256); //Factoria para crear la SecretKey, debemos indicar el Algoritmo SecretKeyFactory factory = SecretKeyFactory.getInstance(PBE_ALGORITHM); SecretKey tmp = factory.generateSecret(pbeKeySpec); //Creamos una llave; SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES"); //Obtenemos la llave, solo informativo byte[] key = secret.getEncoded(); //La clase Cipher, se usa para cifrar mediante algoritmos de clave simétrica Cipher encryptionCipher = Cipher.getInstance(CIPHER_ALGORITHM); //byte[] iv = generateIv(); IvParameterSpec ivspec = new IvParameterSpec(iv); //Accion, SecretKey, parameter specification for an initialization vector encryptionCipher.init(Cipher.ENCRYPT_MODE, secret, ivspec); //Realizamos el cifrado encryptedText = encryptionCipher.doFinal(cleartext.getBytes()); } catch (Exception e) { e.printStackTrace(); } return encryptedText; } public String decrypt(String password, byte[] encryptedText) { String cleartext = ""; try { PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray(), salt, PBE_ITERATION_COUNT, 256); //Factoria para crear la SecretKey, debemos indicar el Algoritmo SecretKeyFactory factory = SecretKeyFactory.getInstance(PBE_ALGORITHM); SecretKey tmp = factory.generateSecret(pbeKeySpec); //Creamos una llave; SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES"); //Obtenemos la llave, solo informativo byte[] key = secret.getEncoded(); //La clase Cipher, se usa para cifrar mediante algoritmos de clave simétrica Cipher decryptionCipher = Cipher.getInstance(CIPHER_ALGORITHM); //byte[] iv = generateIv(); IvParameterSpec ivspec = new IvParameterSpec(iv); //Accion, SecretKey, parameter specification for an initialization vector decryptionCipher.init(Cipher.DECRYPT_MODE, secret, ivspec); //Realizamos el descifrado byte[] decryptedText = decryptionCipher.doFinal(encryptedText); cleartext = new String(decryptedText); } catch (Exception e) { e.printStackTrace(); } return cleartext; } }