三重DES加密C# – 用Java解密
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我从客户端服务器获取一个Triple DES解密字符串,该字符串已用c#编码(见下文)：
using System.IO;
using System;
using System.Security.Cryptography;
using System.Collections;
using System.Text;
class Program
{
static void Main()
{
Console.WriteLine("Hello, World!");
var encryption = TripleDESEncrypt("12345678901234", "C9AF269DF8A78A06D1216BFFF8F0536A");
Console.WriteLine(encryption);
}
public static string TripleDESEncrypt(string strClearText, string strKey)
{
byte[] bytClearText;
byte[] bytClearTextChunk = new byte[8];
byte[] bytEncryptedChunk = new byte[8];
int BytesCount = 0;
int nArrayPosition = 0;
string strEncryptedChar;
string strEncryptedText = "";
ArrayList Input = new ArrayList();
ArrayList Output = new ArrayList();
TripleDESCryptoServiceProvider tdes = (TripleDESCryptoServiceProvider)TripleDESCryptoServiceProvider.Create();
tdes.Key = HexToByteArray(strKey);
tdes.Mode = CipherMode.ECB;
ICryptoTransform tdesEncrypt = tdes.CreateEncryptor();
bytClearText = ASCIIEncoding.ASCII.GetBytes(strClearText);
BytesCount = bytClearText.Length;
for (int i = 0; i < BytesCount; i++)
{
if (nArrayPosition == 8)
{
Input.Add(bytClearTextChunk);
bytClearTextChunk = new byte[8];
nArrayPosition = 0;
}
bytClearTextChunk[nArrayPosition] = bytClearText[i];
nArrayPosition++;
}
if (nArrayPosition != 0)
Input.Add(bytClearTextChunk);
foreach (byte[] Cbyte in Input)
{
tdesEncrypt.TransformBlock(Cbyte, 0, 8, bytEncryptedChunk, 0);
Output.Add(bytEncryptedChunk);
bytEncryptedChunk = null;
bytEncryptedChunk = new byte[8];
}
foreach (byte[] Cbyte in Output)
{
foreach (byte BByte in Cbyte)
{
strEncryptedChar = BByte.ToString("X");
strEncryptedChar = strEncryptedChar.PadLeft(2, Convert.ToChar("0"));
strEncryptedText += strEncryptedChar;
}
}
return strEncryptedText;
}
private static byte[] HexToByteArray(string strHex)
{
byte[] bytArray = new byte[strHex.Length / 2];
int positionCount = 0;
for (int i = 0; i < strHex.Length; i += 2)
{
bytArray[positionCount] = byte.Parse(strHex.Substring(i, 2), System.Globalization.NumberStyles.HexNumber);
positionCount++;
}
return bytArray;
}
}
然后我尝试使用此密钥在Java中解密它：C9AF269DF8A78A06D1216BFFF8F0536A
这是我的解密代码：
public String DesDecryptPin(String pin, String encryptKey) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, UnsupportedEncodingException {
String UNICODE_FORMAT = "UTF8";
String decryptedPinText = null;
byte[] hexConvert = hexStringtoByteArray(encryptKey);
SecretKey desKey = null;
byte[] tdesKey = new byte[24];
System.arraycopy(hexConvert, 0, tdesKey, 0,16);
System.arraycopy(hexConvert, 0, tdesKey, 0,8);
byte[] encryptKeyBytes = encryptKey.getBytes(UNICODE_FORMAT);
KeySpec desKeySpec = new DESedeKeySpec(tdesKey);
Cipher desCipher;
SecretKeyFactory skf = SecretKeyFactory.getInstance("DESede");
desCipher = Cipher.getInstance("DESede/ECB/NoPadding");
try {
desKey = skf.generateSecret(desKeySpec);
} catch (InvalidKeySpecException e) {
e.printStackTrace();
}
desCipher.init(Cipher.DECRYPT_MODE, desKey);
byte[] decryptPin = desCipher.doFinal(pin.getBytes());
decryptedPinText = new String(decryptPin, "UTF-8");
return decryptedPinText;
}
输出/输出的样本输出将是“12345678901234”但是,我得到了混乱的废话,例如 0 8 /0
所以在c#和java之间迷失了…
这是我之前提出的问题here的后续问题
我很感激这方面的帮助
更改代码
public String DesDecryptPin(String pin, String encryptKey) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, UnsupportedEncodingException {
String UNICODE_FORMAT = "UTF8";
String decryptedPinText = null;
SecretKey desKey = null;
byte[] encryptKeyBytes = EncodingUtils.getAsciiBytes(encryptKey);
byte[] tdesKey = new byte[24];
System.arraycopy(encryptKeyBytes, 8, tdesKey, 0, 8);
System.arraycopy(encryptKeyBytes, 0, tdesKey, 8, 16);
KeySpec desKeySpec = new DESedeKeySpec(tdesKey);
Cipher desCipher;
SecretKeyFactory skf = SecretKeyFactory.getInstance("DESede");
desCipher = Cipher.getInstance("DESede/ECB/NoPadding");
try {
desKey = skf.generateSecret(desKeySpec);
} catch (InvalidKeySpecException e) {
e.printStackTrace();
}
desCipher.init(Cipher.DECRYPT_MODE, desKey);
byte[] decryptPin = desCipher.doFinal(EncodingUtils.getAsciiBytes(pin));
decryptedPinText = new String(decryptPin, "ASCII");
return decryptedPinText;
}
c#解密代码
using System.IO;
using System;
using System.Security.Cryptography;
using System.Collections;
using System.Text;
class Program
{
static void Main()
{
Console.WriteLine("Hello, World!");
var encryption = TripleDESDecrypt("1D30CC3DE1641D7F5E821D13FC1200C3", "C9AF269DF8A78A06D1216BFFF8F0536A");
Console.WriteLine(encryption);
}
public static string TripleDESDecrypt(string strEncryptedText, string strKey)
{
string errorMessage = "";
int errorCode = 0;
string strDecryptedText = "";
try
{
byte[] bytEncryptedChunk = new byte[8];
byte[] bytClearTextChunk = new byte[8];
byte[] _bytesEmpty = new byte[8];
int BytesCount = 0;
int positionCount = 0;
ArrayList Input = new ArrayList();
ArrayList Output = new ArrayList();
TripleDESCryptoServiceProvider tdes = (TripleDESCryptoServiceProvider)TripleDESCryptoServiceProvider.Create();
tdes.Key = HexToByteArray(strKey);
tdes.Mode = CipherMode.ECB;
ICryptoTransform tdesDecrypt = tdes.CreateDecryptor();
BytesCount = strEncryptedText.Length;
for (int i = 0; i < BytesCount; i += 2)
{
if (positionCount == 8)
{
positionCount = 0;
Input.Add(bytEncryptedChunk);
bytEncryptedChunk = new byte[8];
}
bytEncryptedChunk[positionCount] = byte.Parse(strEncryptedText.Substring(i, 2), System.Globalization.NumberStyles.HexNumber);
positionCount++;
}
if (positionCount != 0)
{
Input.Add(bytEncryptedChunk);
}
foreach (byte[] Cbyte in Input)
{
tdesDecrypt.TransformBlock(Cbyte, 0, 8, _bytesEmpty, 0);
tdesDecrypt.TransformBlock(Cbyte, 0, 8, bytClearTextChunk, 0);
Output.Add(bytClearTextChunk);
bytClearTextChunk = null;
bytClearTextChunk = new byte[8];
}
foreach (byte[] Cbyte in Output)
{
strDecryptedText += ASCIIEncoding.ASCII.GetString(Cbyte);
}
}
catch (Exception ex)
{
errorCode = 1;
errorMessage = ex.Message;
}
Console.WriteLine(strDecryptedText);
return strDecryptedText;
}
private static byte[] HexToByteArray(string strHex)
{
byte[] bytArray = new byte[strHex.Length / 2];
int positionCount = 0;
for (int i = 0; i < strHex.Length; i += 2)
{
bytArray[positionCount] = byte.Parse(strHex.Substring(i, 2), System.Globalization.NumberStyles.HexNumber);
positionCount++;
}
return bytArray;
}
}
这将返回输入加密12345678901234的内容
解决方法:
在您的C#代码中,您使用ASCII：
bytClearText = ASCIIEncoding.ASCII.GetBytes(strClearText);
在Java中使用UNICODE：
byte[] encryptKeyBytes = encryptKey.getBytes(UNICODE_FORMAT);
尝试更改您的C#以使用UNICODE或您的Java代码来使用ASCII.
此外,由于C#填充输出：
strEncryptedChar = strEncryptedChar.PadLeft(2, Convert.ToChar("0"));
您可能必须检查以删除加密字符串中的所有’00’,因此1D30CC3DE1641D7F5E821D13FC1200C3将成为1D30CC3DE1641D7F5E821D13FC12C3
(你必须检查它是否在十六进制表达式的边界：1C01A1应该被修改,因为它在第二个Hexa 1C 01 A1：1C1A1上有一个填充
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