获得：在AES/CBC/PKCS5Padding

我的常量 'BadPaddingException垫块损坏'获得：在AES/CBC/PKCS5Padding

public static final String AES_ALGORITHM_MODE_PADDING = "AES/CBC/PKCS5Padding"; 
public static final String AES = "AES"; 
public static final String PROVIDER = "BC";

加密

Cipher aesCipher = Cipher.getInstance(AES_ALGORITHM_MODE_PADDING, PROVIDER); 
    SecretKeySpec aeskeySpec = new SecretKeySpec(rawAesKey, AES); 
    aesCipher.init(Cipher.ENCRYPT_MODE, aeskeySpec); 
    byte[] encryptedData = aesCipher.doFinal(data); 
    this.iv = Base64.encodeBase64(aesCipher.getIV()); //get hold of the random IV 

    return encryptedData;

在另一类我做解密

 IvParameterSpec ivspec = new IvParameterSpec(this.iv); //this is already been converted from base64 to raw form. 

Cipher aesCipher = Cipher.getInstance(AES_ALGORITHM_MODE_PADDING, PROVIDER); 
SecretKeySpec aeskeySpec = new SecretKeySpec(rawAesKey, AES); 
aesCipher.init(Cipher.DECRYPT_MODE, aeskeySpec, ivspec); 

return aesCipher.doFinal(rawEncryptedLicenseData);

现在，当我运行这个我得到一个BadPaddingException在doFinal解密时，我做错了什么？如果我删除CBC/PKCS5Padding和IV的东西，只使用AES，它的工作原理！

来源

2010-07-05 jax

我看不出什么毛病你是显示的代码。我怀疑你没有正确地在课堂上移动IV。如果您可以在自包含的示例中重现问题（首先进行加密然后解密的一种方法），请尝试尝试。 – 2010-07-05 08:21:55

你说得对。我注释了我的RAW AES密钥的保存，所以eclipse使用了之前的JUnit测试中的旧密钥。 – jax 2010-07-05 09:13:44

你可以尝试CTR模式没有填充：

Cipher cipherAlg = Cipher.getInstance("AES/CTR/NoPadding", PROVIDER); 
byte[] ivBytes = new byte[cipherAlg.getBlockSize()]; 
(new SecureRandom()).nextBytes(ivBytes); 
cipherAlg.init(Cipher.ENCRYPT_MODE, secretKey, new IvParameterSpec(ivBytes)); 
byte[] cipher = cipherAlg.doFinal(plainText); 
byte[] cipherText = new byte[ivBytes.length + cipher.length]; 
System.arraycopy(ivBytes, 0, cipherText, 0, ivBytes.length); 
System.arraycopy(cipher, 0, cipherText, ivBytes.length, cipher.length); 
return cipherText;

来源

2010-07-05 06:46:10

获得：在AES/CBC/PKCS5Padding

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