Question

我们有一些加密的xml文件，其中包含以下字符，例如： $¹QÆ¨Jiå•Á@ Ü¶Äºµé）‰ï¦MSš¨íÄ;GfóûÇsHte;2Ð_。谁能指导我们如何使用C＃中的TripleDes算法解密此类文件内容。

Answer 1

已经使用DES加密而不是三重DES，希望有帮助

提醒一下，DES是对称加密，这意味着单个密钥可用于加密和解密数据。下面是如何使用DES加密和解密

创建资源文件并将其命名为CryptoKeys

将以下字符串添加到CryptoKeys文件中

DesVector:0x11, 0x45, 0x47, 0x61, 0x12, 0xbc, 0xad 0xfc:;
DesKey:0xff, 0x12, 0x63, 0xa, 0x16 0xcf, 0xaf, 0xfb;

创建静态类来管理加密和解密

public static class CryptoHelper
{
    //Init the key and Vector
    public static void InitDESKeys()
    {
        try
        {
        MemoryStream tempStream = new MemoryStream();
        string[] charkey = Resources.CryptoKeys.DesKey.Split(',');
        string[] chariv = Resources.CryptoKeys.DesVector.Split(',');
        MemoryStream MemoryStreamkey = new MemoryStream(DesKey);
        MemoryStream MemoryStreamiv = new MemoryStream(DesVector);

        foreach (string item in charkey)
        {
            MemoryStreamkey.WriteByte(Convert.ToByte(item, 16));
        }

        foreach (string item in chariv)
        {
            MemoryStreamiv.WriteByte(Convert.ToByte(item, 16));
        }
        }
        catch (Exception ex)
        {

        }
    }

    //Create function DESEncrypt to manage the encryption

    public static string DESEncrypt(string sourceData)
    {
        try
        {
        byte[] sourceDataBytes = System.Text.Encoding.Unicode.GetBytes(sourceData);
        MemoryStream tempStream = new MemoryStream();
        DESCryptoServiceProvider encryptor = new DESCryptoServiceProvider();
        CryptoStream encryptionStream = new CryptoStream(tempStream, encryptor.CreateEncryptor(DesKey, DesVector), CryptoStreamMode.Write);
        encryptionStream.Write(sourceDataBytes, 0, sourceDataBytes.Length);
        encryptionStream.FlushFinalBlock();
        byte[] encryptedDataBytes = tempStream.GetBuffer();
        return Convert.ToBase64String(encryptedDataBytes, 0, (int)tempStream.Length);
        }
        catch (Exception ex)
        {
        throw new Exception("Unable to encrypt data.");
        }
    }

    //Create function DESDecrypt to manage the decryption

    public static string DESDecrypt(string sourceData)
    {
        try
        {
        byte[] encryptedDataBytes = Convert.FromBase64String(sourceData);
        MemoryStream tempStream = new MemoryStream(encryptedDataBytes, 0, encryptedDataBytes.Length);
        DESCryptoServiceProvider decryptor = new DESCryptoServiceProvider();
        CryptoStream decryptionStream = new CryptoStream(tempStream, decryptor.CreateDecryptor(DesKey, DesVector), CryptoStreamMode.Read);
        byte[] bytesCryptedData = new byte[tempStream.Length];
        decryptionStream.Read(bytesCryptedData, 0, (int)tempStream.Length);

        var CryptedDataText = System.Text.Encoding.Unicode.GetString(bytesCryptedData);
        return CryptedDataText;
        }
        catch (Exception ex)
        {
        throw new Exception("Unable to encrypt data.");
        }
    }
}

在主类中调用加密

static void Main(string[] args)
{
   CryptoHelper.InitDESKeys();
   string strText==Strin.Empty();
   strText="Text to decrypt";
   string encryptedText=CryptoHelper.DESEncrypt(strText);
   string decryptedText=Strin.Empty();
   decryptedText=CryptoHelper.DESDecrypt(strText);
}

使用Tripdes算法的XML文件解密

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