Question

我已经获得了一个加密文件以及base64对称密钥和base 64 IV，并且已经被要求使用Java对其进行解密。数据文件上使用的加密是AES。但是，当我将加密文件，对称密钥和IV运行到我的代码中时，我收到以下错误：

javax.crypto.IllegalBlockSizeException: Input length must be multiple of 16 when decrypting with padded cipher 
at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:913)

这是我的代码：

String encryptedData = "C:\\EncryptedDataFile.data";
FileInputStream fis = null;
File file = new File(encryptedData);

//Convert file into array of bytes
byte[] encryptedDataBytes = new byte[(int) file.length()];

try 
{           
    // Read in array of bytes
    fis = new FileInputStream(file);
    fis.read(encryptedDataBytes);
    fis.close();     
} 
catch (FileNotFoundException ex) 
{
    ex.printStackTrace();
} 
catch (IOException ex) 
{
    ex.printStackTrace();
} 

// AES Key
byte[] decodedKey = Base64.getDecoder().decode("50rofsdb0TnQAQCb702wKz8m6XQeLNj6lamEvivKsh8=");

// decode the base64 encoded string
SecretKey originalKey = new SecretKeySpec(decodedKey, 0, decodedKey.length, "AES"); // rebuild key using SecretKeySpec

// IV
byte[] initVecBytes = Base64.getDecoder().decode("OUXLZq4SpyhzNGIei0nerA==");

// Decrypt the cipher text        
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); 
IvParameterSpec ivParameterSpec = new IvParameterSpec(initVecBytes);
cipher.init(Cipher.DECRYPT_MODE, originalKey, ivParameterSpec);
byte[] original = cipher.doFinal(encryptedDataBytes);
String s = new String(original);
System.out.println(s);

如果有人可以就此问题向我提供一些帮助，我们将不胜感激

如何使用base64 Symmetric key和IV解密加密的AES文件

0 个答案: