C# DES与Java DES Byte[]和BlockSize不同

Question

我很难让Java代码输出与C#代码相同的C#。

C#代码：

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

public class Program
{
    private const string k = "A2B3C4D1";
    private const string kiv = "1A2B3C4D";
    
    public static void Main()
    {
        encrypt("peanuts");
    }
    
    public static void encrypt(string str)
    {
        try
        {
            using (var ms = new MemoryStream())
            using (var csp = new DESCryptoServiceProvider() { Key = Encoding.UTF8.GetBytes(k), IV =  Encoding.UTF8.GetBytes(kiv) })
            {
                Console.WriteLine("Algorithm: DES?/" + csp.Mode + "/" + csp.Padding);
                Console.WriteLine("BlockSize: " + csp.BlockSize);

                using (var cs = new CryptoStream(ms, csp.CreateEncryptor(), CryptoStreamMode.Write))
                using (var sw = new StreamWriter(cs))
                    sw.WriteLine(str);

                byte[] barray = ms.ToArray();

                Console.WriteLine("barray length: " + barray.Length);
            
                Console.WriteLine("barray: " + string.Join(" ", barray));
            }
        }
        catch (Exception ex) { Console.Write(ex.ToString()); }
    }
}

Java代码：

import java.io.ByteArrayOutputStream;
import java.nio.charset.Charset;
import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class MyClass {
    private static final String k = "A2B3C4D1";
    private static final String kiv = "1A2B3C4D";
    
    public static void main(String args[]) {
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

        encrypt("peanuts");
    }
    
    public static void encrypt(String str) {
        try {
            SecretKeySpec key = new SecretKeySpec(k.getBytes(Charset.forName("UTF-8")), "DES");
            IvParameterSpec iv = new IvParameterSpec(kiv.getBytes(Charset.forName("UTF-8")));
            Cipher cipher = Cipher.getInstance("DES/CBC/PKCS7Padding");
            cipher.init(Cipher.ENCRYPT_MODE, key, iv);
            
            System.out.println("Algorithm: " + cipher.getAlgorithm());
            System.out.println("BlockSize: " + cipher.getBlockSize());
    
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            CipherOutputStream cos = new CipherOutputStream(out, cipher);
            
            cos.write(str.getBytes());
            cos.close();
            
            byte[] barray = out.toByteArray();
            
            System.out.println("barray length: " + barray.length);
        
            System.out.print("barray: ");
            for(byte b : barray){
                System.out.print(" " + b);
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

C#输出

算法:DES/CBC/PKCS7 7 BlockSize: 64 barray长度: 16 酒吧: 107 125 91 205 77 206 98 120 214 194 64 167 128 97 132 75 base64: a31bzU3OYnjWwkCngGGESw==

Java输出

算法: DES/CBC/PKCS7Padding 7填充 BlockSize: 8 巴尔长度:8 酒吧: 45 100 -86 103 9 -7 -19 -76 base64: LWSqZwn57bQ=

我正试图从Byte[]代码中获得与C#完全相同的C#输出。但我所看到的唯一不同之处是，块大小与两者不同。

C# Dot.Net Fiddle

Java jDoodle.com

我只是不明白，有什么是我遗漏的还是不明白的？

编辑

我添加了代码来打印字符串中的字节数组，它不同：

C#

barray length: 16
barray: 107 125 91 205 77 206 98 120 214 194 64 167 128 97 132 75
base64: a31bzU3OYnjWwkCngGGESw==

Java

barray length: 8
barray: 45 100 -86 103 9 -7 -19 -76
base64: LWSqZwn57bQ=

Answer 1

@JamesKPolk是正确的:您正在用C#加密C#，用Java加密{ (byte)'p', (byte)'e', (byte)'a', (byte)'n', (byte)'u', (byte)'t', (byte)'s' }。

因为“花生”是(在UTF-8中)7个字节，所以它可以被PKCS7填充到一个DES块中。接下来的1-8字节会导致第二个块.你又加了两个。

将Dot.Net填充中的代码更改为Write而不是WriteLine生成

Algorithm: DES?/CBC/PKCS7
BlockSize: 64
barray length: 8
barray: 45 100 170 103 9 249 237 180
barray: LWSqZwn57bQ=

现在唯一的区别是，C# BlockSize是位的，而您的BlockSize代码将它作为字节。

在您的"peanuts"中将"peanuts\r\n"更改为JDoodle，您将得到

Algorithm: DES/CBC/PKCS7Padding
BlockSize: 8
barray length: 16
barray:  107 125 91 -51 77 -50 98 120 -42 -62 64 -89 -128 97 -124 75
barray: a31bzU3OYnjWwkCngGGESw==

这是相同的，如果barray十进制内容被打印为无符号值而不是有符号值(将256个添加到所有负数中) --这个事实在Base64中是相同的。