C＃/ Java | AES256加密/解密

我想加密通过Java / C＃套接字（Java服务器，C＃客户端）发送的所有数据。 我想使用AES256，但我不能让Java和C＃生成相同的加密代码。 任何人都可以给我两个例子，1个用Java，1个用C＃生成相同的结果并正确解密结果？

到目前为止我尝试了什么：

public Encrypt(AOBCore instance){ try { String message="This is just an example"; // Get the KeyGenerator KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(256); // 192 and 256 bits may not be available // Generate the secret key specs. SecretKey skey = kgen.generateKey(); //Cantget 'test' in here... byte[] raw = skey.getEncoded(); SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); // Instantiate the cipher Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); byte[] encrypted = cipher.doFinal(message.getBytes()); System.out.println("encrypted string: " + asHex(encrypted)); cipher.init(Cipher.DECRYPT_MODE, skeySpec); byte[] original = cipher.doFinal(encrypted); String originalString = new String(original); System.out.println("Original string: " + originalString + " " + asHex(original)); } catch (Exception e) { instance.logMessage(e.getMessage()); } } public static String asHex (byte buf[]) { StringBuffer strbuf = new StringBuffer(buf.length * 2); int i; for (i = 0; i < buf.length; i++) { if (((int) buf[i] & 0xff) < 0x10) strbuf.append("0"); strbuf.append(Long.toString((int) buf[i] & 0xff, 16)); } return strbuf.toString(); } 

}

 static void Main(string[] args) { while (true) { var plain = Console.ReadLine(); var key = GenerateKey(256); var encoded = Encrypt(plain, key, 256); Console.WriteLine("Encoded: " + encoded); Console.WriteLine(Decrypt(encoded, key, 256)); } } private static string GenerateKey(int keySize) { return "test"; } private static string Encrypt(string plainStr, string completeEncodedKey, int keySize) { RijndaelManaged aesEncryption = new RijndaelManaged(); aesEncryption.KeySize = keySize; aesEncryption.BlockSize = 256; aesEncryption.Mode = CipherMode.CBC; aesEncryption.Padding = PaddingMode.PKCS7; aesEncryption.IV = Convert.FromBase64String(ASCIIEncoding.UTF8.GetString(Convert.FromBase64String(completeEncodedKey)).Split(',')[0]); aesEncryption.Key = Convert.FromBase64String(ASCIIEncoding.UTF8.GetString(Convert.FromBase64String(completeEncodedKey)).Split(',')[1]); byte[] plainText = ASCIIEncoding.UTF8.GetBytes(plainStr); ICryptoTransform crypto = aesEncryption.CreateEncryptor(); // The result of the encryption and decryption byte[] cipherText = crypto.TransformFinalBlock(plainText, 0, plainText.Length); return Convert.ToBase64String(cipherText); } private static string Decrypt(string encryptedText, string completeEncodedKey, int keySize) { RijndaelManaged aesEncryption = new RijndaelManaged(); aesEncryption.KeySize = keySize; aesEncryption.BlockSize = 128; aesEncryption.Mode = CipherMode.CBC; aesEncryption.Padding = PaddingMode.PKCS7; aesEncryption.IV = Convert.FromBase64String(ASCIIEncoding.UTF8.GetString(Convert.FromBase64String(completeEncodedKey)).Split(',')[0]); aesEncryption.Key = Convert.FromBase64String(ASCIIEncoding.UTF8.GetString(Convert.FromBase64String(completeEncodedKey)).Split(',')[1]); ICryptoTransform decrypto = aesEncryption.CreateDecryptor(); byte[] encryptedBytes = Convert.FromBase64CharArray(encryptedText.ToCharArray(), 0, encryptedText.Length); return ASCIIEncoding.UTF8.GetString(decrypto.TransformFinalBlock(encryptedBytes, 0, encryptedBytes.Length)); } 

Answer 1

问题是您没有在Java代码中指定密码或填充。 这将使用算法默认值，当需要与其他库的互操作性时，这绝不是您想要做的事情。 像这样初始化你的Cipher ：

 Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); 

根据这个答案，Java中的PKCS5应该与.Net中的PKCS7兼容。 由于您明智地使用CBC，因此您需要修改代码以使用相同的初始化向量进行加密和解密。 你不应该使用密钥。 IV应随机生成。 您可以通过调用cipher.getIV()来使用Java Cipher生成的用于加密的IV。

另外，请注意与评论中提到的字符编码保持一致。