我开始在我的网络服务中使用加密和解密。我正在使用RSACryptoServiceProvider并且在使用Encrypt & Decrypt方法时，我没有问题。
但是，一旦我尝试使用带有新 SHA1CryptoServiceProvider()的SignData方法作为加密方法，我就无法恢复原始数据。我只能验证它们。真的无法检索签名数据吗？如果是这样，整个签名过程的目的是什么？还有另一种可能性如何通过某种算法加密数据？
编辑：我正在发布代码，这只是MSDN的一个更改示例
static void Main()
{
try
{
//Create a UnicodeEncoder to convert between byte array and string.
ASCIIEncoding ByteConverter = new ASCIIEncoding();
string dataString = "Data to Encrypt";
//Create byte arrays to hold original, encrypted, and decrypted data.
byte[] dataToEncrypt = ByteConverter.GetBytes(dataString);
byte[] encryptedData;
byte[] signedData;
byte[] decryptedData;
byte[] unsignedData;
var fileName = ConfigurationManager.AppSettings["certificate"];
var password = ConfigurationManager.AppSettings["password"];
var certificate = new X509Certificate2(fileName, password);
//Create a new instance of the RSACryptoServiceProvider class
// and automatically create a new key-pair.
RSACryptoServiceProvider RSAalg = (RSACryptoServiceProvider)certificate.PrivateKey;
//RSAPKCS1SignatureDeformatter def = (RSAPKCS1SignatureDeformatter)certificate.PrivateKey;
//Display the origianl data to the console.
Console.WriteLine("Original Data: {0}", dataString);
//Encrypt the byte array and specify no OAEP padding.
//OAEP padding is only available on Microsoft Windows XP or
//later.
encryptedData = RSAalg.Encrypt(dataToEncrypt, false);
signedData = RSAalg.SignData(dataToEncrypt, new SHA1CryptoServiceProvider());
//Display the encrypted data to the console.
Console.WriteLine("Encrypted Data: {0}", ByteConverter.GetString(encryptedData));
Console.WriteLine("Signed Data: {0}", ByteConverter.GetString(signedData));
//Pass the data to ENCRYPT and boolean flag specifying
//no OAEP padding.
decryptedData = RSAalg.Decrypt(encryptedData, false);
//In the next line I get the error of wrong data
unsignedData = RSAalg.Decrypt(signedData, false);
//Display the decrypted plaintext to the console.
Console.WriteLine("Decrypted plaintext: {0}", ByteConverter.GetString(decryptedData));
Console.WriteLine("Unsigned plaintext: {0}", ByteConverter.GetString(unsignedData));
}
catch (CryptographicException e)
{
//Catch this exception in case the encryption did
//not succeed.
Console.WriteLine(e.Message);
}
Console.Read();
}