Java to C#.net - 使用带密码的 AES 进行加密和解密

Question

我们有 java 库，它将使用带有密码的 AES 进行加密和解密，我们需要将其移植到 .NET。

这是我的 java 代码 -

import java.util.*;
import java.lang.*;
import java.io.File;
import java.io.FileInputStream;
import java.math.BigInteger;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

class Rextester
{  
    public static void main(String args[])
    {
        byte[] encrypted = EncryptonToBytes("Hello");
        System.out.println("Encrypted: " + encrypted); // Result --> Encrypted: [B@1c53fd30
        String decrypted = DecryptionFromBytes(encrypted);
        System.out.println("Decrypted: " + decrypted);
    }

    public static final byte[] EncryptonToBytes(String str)
    {
        byte[] result = null; 

        //Create SecretKey object from common secret key string mentioned in constants class
        byte[] encoded = new BigInteger("728faf34b64cd55c8d1d500268026ffb", 16).toByteArray();
        SecretKey secretKey = new SecretKeySpec(encoded, "AES");

        Cipher cipher;
        try {
            //Cipher class object using AES as transformation
            cipher = Cipher.getInstance("AES");

            //Initialize cipher in encrypt mode along with secret key object created above.
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);

            //Encrypt input string
            result = cipher.doFinal(str.getBytes());

        } catch (Exception e) {
            e.printStackTrace();
        } 

        //Return null in case of any error
        return result;
    }

    public static String DecryptionFromBytes(byte[] base64Data) 
    {       
        try {
            //Create SecretKey object from common secret key string mentioned in constants class
            byte[] encoded = new BigInteger("728faf34b64cd55c8d1d500268026ffb", 16).toByteArray();
            SecretKey secretKey = new SecretKeySpec(encoded, "AES");

            //Cipher class object using AES as transformation
            Cipher cipher = Cipher.getInstance("AES");

            //Initialize cipher in decrypt mode along with secret key object created above.
            cipher.init(Cipher.DECRYPT_MODE, secretKey);

            //Decrypt input byte array
            byte[] decryptedByte = cipher.doFinal(base64Data);

            //return decrypted input bytes as string
            return (new String(decryptedByte));
        } catch (Exception e) {
            e.printStackTrace();
        } 

        //return empty string if any error 
        return "";
    }
}

我关注了下面的一些文章 -

1. Using AES encryption in C#
2. http://csharphelper.com/blog/2014/09/encrypt-or-decrypt-files-in-c/
3. https://www.codeproject.com/Articles/769741/Csharp-AES-bits-Encryption-Library-with-Salt
4. Cipher, Java encrypt, C# decrypt
5. Password encryption/decryption code in .NET
6. https://ourcodeworld.com/articles/read/471/how-to-encrypt-and-decrypt-files-using-the-aes-encryption-algorithm-in-c-sharp
7. http://mjremijan.blogspot.com/2014/08/aes-encryption-between-java-and-c.html

但他们都没有给我想要的输出。我正在寻找的是 - 我的 java 和 .net 函数都应该给我相同的结果。 从上周开始，我一直在努力完成它，完全沮丧。非常感谢您的帮助。

Answer 1

两种方法：

public static byte[] EncryptionToBytes(string str)
{
    using (var aes = new AesManaged())
    {
        aes.Key = new byte[] { 0x72, 0x8f, 0xaf, 0x34, 0xb6, 0x4c, 0xd5, 0x5c, 0x8d, 0x1d, 0x50, 0x02, 0x68, 0x02, 0x6f, 0xfb };
        aes.Mode = CipherMode.ECB;
        aes.Padding = PaddingMode.PKCS7;

        using (var ms = new MemoryStream())
        {
            using (var cs = new CryptoStream(ms, aes.CreateEncryptor(), CryptoStreamMode.Write))
            {
                byte[] data = Encoding.UTF8.GetBytes(str);
                cs.Write(data, 0, data.Length);
            }

            byte[] encrypted = ms.ToArray();
            return encrypted;
        }
    }
}

public static string DecryptionFromBytes(byte[] encrypted)
{
    using (var aes = new AesManaged())
    {
        aes.Key = new byte[] { 0x72, 0x8f, 0xaf, 0x34, 0xb6, 0x4c, 0xd5, 0x5c, 0x8d, 0x1d, 0x50, 0x02, 0x68, 0x02, 0x6f, 0xfb };
        aes.Mode = CipherMode.ECB;
        aes.Padding = PaddingMode.PKCS7;

        using (var ms2 = new MemoryStream())
        {
            using (var ms = new MemoryStream(encrypted))
            using (var cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Read))
            {
                cs.CopyTo(ms2);
            }

            byte[] decrypted = ms2.ToArray();
            return Encoding.UTF8.GetString(decrypted);
        }
    }
}

注意

System.out.println("Encrypted: " + encrypted);

不会打印byte[]，但会打印print [, followed by a character representing the type of the array's elements (in your case C for char), followed by @ then the "identity hash code" of the array (think of it like you would a "memory address")。

Java 似乎使用（尚未查找文档）带有模式 ECB 的 AES，填充 PKCS7（this 证实了我的观察）

请注意，String.getBytes() 使用“默认”编码进行编码，在不同的计算机中可能会有所不同。最好使用getBytes("UTF-8") 和new String(bytes, "UTF-8")（参见https://stackoverflow.com/a/5729823/613130）。在我编写的代码中，我使用了 UTF8。可以使用Encoding.Default模拟Java代码。