AES 解密：javax.crypto.IllegalBlockSizeException：解密的最后一个块不完整
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AES Decryption : javax.crypto.IllegalBlockSizeException: last block incomplete in decryption
提问by iAviatorJose
I am trying to decrypt an encrypted data obtained from a web service using AES128 cryptography.
我正在尝试使用 AES128 加密解密从 Web 服务获得的加密数据。
following is the code i am using to achieve the same.
以下是我用来实现相同目的的代码。
But i always end up with the following exception:
javax.crypto.IllegalBlockSizeException: last block incomplete in decryption
但我总是以以下例外结束：
javax.crypto.IllegalBlockSizeException: last block incomplete in decryption
public static String decrypt(String strToDecrypt)
{
try
{
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
final SecretKeySpec secretKey = new SecretKeySpec(AppConstants.AESEncryptionKey.getBytes("UTF8"), "AES");
cipher.init(Cipher.DECRYPT_MODE, secretKey,new IvParameterSpec(new byte[16])); //new IvParameterSpec(new byte[16])
byte base64Data[] = Base64.encode(strToDecrypt.getBytes(), Base64.DEFAULT);
@SuppressWarnings("unused")
String s = base64Data.toString();
byte decBytes[] = cipher.doFinal(base64Data);
String decStr = new String(decBytes);
return decStr;
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}
Please Pour in your valuable inputs as i am badly stuck over here.
请倾注您的宝贵意见，因为我被困在这里。
采纳答案by Maarten Bodewes
You are encoding the base 64 encoded ciphertext instead of decoding it. Depending on your Base64you need to call a function that decodes from a Stringor CharSequenceto an array of bytes, and then decrypt that. Please test if the result is a multiple of the block size, 16 bytes for AES.
您正在对 base 64 编码的密文进行编码，而不是对其进行解码。根据Base64您的需要，您需要调用一个从字节数组String或CharSequence字节数组解码的函数，然后对其进行解密。请测试结果是否是块大小的倍数，AES 为 16 字节。
回答by UVM
You have to call Base64.decodeBase64(s). Then call Cipher.doFinal()
您必须调用 Base64.decodeBase64(s)。然后调用 Cipher.doFinal()
Cipher.doFinal(Base64.decodeBase64(s));
Cipher.doFinal(Base64.decodeBase64(s));
回答by Yogesh Rathi
Important note
重要的提示
In my case this issue came because of encryption not done properly, when i try to encrypt data that time my code through error that's why in middle encryption is terminated, so once you check your encryption is working properly.
在我的情况下，这个问题是因为加密没有正确完成，当我尝试加密数据时，我的代码通过错误，这就是为什么中间加密被终止， 所以一旦你检查你的加密是否正常工作。
