【发布时间】：2023-03-23 21:09:01
【问题描述】：
我必须解密一些使用 AES256 Rijndael 加密发送的数据。 我有小伙伴用的加解密机制，是用JAVA开发的，不是很熟悉，但是用C#转置不了。
给我的密钥是 10 个字符长。
我认为下面的代码是可以的，除了 IV 计算。 您将首先找到 java 代码，然后是 C#：
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class UtilsCrypto {
/* Rijndael/CFB8/NoPadding is default cipher */
final static String CHIPHER = "Rijndael/CFB8/NoPadding";
public static final String MESSAGE_DIGEST_ALGORITHM = "MD5";
public static final String AES = "AES";
public static final String AES_ECB_NO_PADDING = "AES/ECB/NoPadding";
private static byte[] md5(final String input) throws NoSuchAlgorithmException {
final MessageDigest md = MessageDigest.getInstance(MESSAGE_DIGEST_ALGORITHM);
return md.digest(input.getBytes());
}
private Cipher initCipher(final int mode, final String secretKey) throws Exception {
final byte[] key = md5(secretKey);
final byte[] iv = md5(secretKey);
final SecretKeySpec skeySpec = new SecretKeySpec(key, AES);
/* This valid with other ciphers than Rijndael/CFB8/NoPadding */
// final IvParameterSpec initialVector = new IvParameterSpec(iv);
/* Use this with Rijndael/CFB8/NoPadding */
final IvParameterSpec initialVector = new IvParameterSpec(getIvBytes(iv));
final Cipher cipher = Cipher.getInstance(CHIPHER);
cipher.init(mode, skeySpec, initialVector);
return cipher;
}
public String encrypt(final String dataToEncrypt, final String secretKey) {
if (Utils.isEmpty(secretKey))
return dataToEncrypt;
String encryptedData = null;
try {
final Cipher cipher = initCipher(Cipher.ENCRYPT_MODE, secretKey);
final byte[] encryptedByteArray = cipher.doFinal(dataToEncrypt.getBytes(Charset.forName("UTF8")));
final BASE64Encoder enc = new BASE64Encoder();
encryptedData = enc.encode(encryptedByteArray);
encryptedData = encryptedData.replace("+", "-");
encryptedData = encryptedData.replace("/", "_");
} catch (Exception e) {
System.err.println("Problem encrypting the data");
e.printStackTrace();
}
return encryptedData;
}
public String decrypt(final String encryptedData, final String secretKey) {
String decryptedData = null;
String inData = encryptedData;
try {
final Cipher cipher = initCipher(Cipher.DECRYPT_MODE, secretKey);
final BASE64Decoder dec = new BASE64Decoder();
inData = inData.replace("-", "+");
inData = inData.replace("_", "/");
final byte[] encryptedByteArray = dec.decodeBuffer(inData); // ok
final byte[] decryptedByteArray = cipher.doFinal(encryptedByteArray);
decryptedData = new String(decryptedByteArray, "UTF8");
} catch (Exception e) {
System.err.println("Problem decrypting the data");
e.printStackTrace();
}
return decryptedData;
}
/**
* This method is only for Rijndael/CFB8/NoPadding
*
* @param hashedKey
* md5
* @return byte array
* @throws Exception
* If any exceptions.
*/
// on passe en arg le hash de la clé
protected byte[] getIvBytes(byte[] hashedKey) throws Exception {
byte[] inputBytes = new byte[16]; // init son tableau a 16 bytes
final SecretKey key = new SecretKeySpec(hashedKey, AES); // secretKey
final Cipher cipher = Cipher.getInstance(AES_ECB_NO_PADDING);
cipher.init(Cipher.ENCRYPT_MODE, key); // chiffre sa clé en AES avec un IV
return cipher.doFinal(inputBytes);
}
}
现在这是我迄今为止尝试过的：
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Xml;
using System.Net;
using System.Web;
using System.Web.Services;
using Newtonsoft.Json;
using System.Security.Cryptography;
using System.Text;
namespace test
{
public byte[] getIVBytes(byte[] hashedKey)
{
byte[] inputBytes = new byte[16];
AesManaged tdes = new AesManaged();
tdes.Key = hashedKey;
tdes.Mode = CipherMode.ECB;
tdes.BlockSize = 128;
tdes.Padding = PaddingMode.None;
ICryptoTransform crypt = tdes.CreateEncryptor();
byte[] bla = crypt.TransformFinalBlock(hashedKey, 0, inputBytes.Length);
return bla;
}
[WebMethod]
public string decrypt(String input, String key)
{
byte[] md5KeyHash;
using (MD5 md5 = MD5.Create())
{
md5KeyHash = md5.ComputeHash(Encoding.UTF8.GetBytes(key));
}
input = input.Replace("-", "+");
input = input.Replace("_", "/");
input = input.Replace(" ", "");
byte[] data = Convert.FromBase64String(input); // récupérer l'array de bytes du message chiffré encodé en b64
String decrypted;
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Mode = CipherMode.CFB;
rijAlg.BlockSize = 128;
rijAlg.Padding = PaddingMode.None;
rijAlg.Key = md5KeyHash;
rijAlg.IV = getIVBytes(md5KeyHash);
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, null);
using (MemoryStream msDecrypt = new MemoryStream(data))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
decrypted = srDecrypt.ReadToEnd();
}
}
}
}
return decrypted;
}
代码似乎是“正确的”，因为除此之外没有抛出任何错误： XML 错误分析：在文本内容中发现了一个无效字符。 在：http://localhost:55175/WebService1.asmx/decrypt 第 2 行，col44 :�Me����>m�H�ZԤ�af2ɾ`A�ٖ�H$�&/
我错过了什么？
【问题讨论】：
-
数据作为 64 位字符串发送。使用 Convert.FromBase64String(string)。 java正在使用：final BASE64Decoder dec = new BASE64Decoder();
-
我不是已经在用了吗？我的解密（）函数的第 10 行？
-
你能给出一些示例加密输入和解密输出吗？然后有人可以验证他们是否有工作代码。
-
我错过了解码。该错误表明使用加密和解密时选项不同。请参阅下一页上的最后一个答案：stackoverflow.com/questions/9584167/…
-
当然。清除输入：“这是一个测试”。加密输出：“1Wnhid6tqCv3cAlbIH4=”。我用java代码测试成功了。
标签： java c# encryption aes rijndael