private void LoadKeyFromXml(string path, RsaKeyType rsaKeyType)
{
if (!File.Exists(path))
throw new FileNotFoundException("File not exists: " + path);
// Using the .NET RSA class to load a key from an Xml file, and populating the relevant members
// of my class with it's RSAParameters
try
{
_rsaCryptosystem.FromXmlString(File.ReadAllText(path));
RSAParameters rsaParams = _rsaCryptosystem.ExportParameters(rsaKeyType == RsaKeyType.Private);
if (rsaKeyType == RsaKeyType.Private)
{
_d = new BigInteger(rsaParams.D); // This parameter is only for private key'
_isPrivateKeyLoaded = true;
}
else
{
_isPublicKeyLoaded = true;
}
_modulus = new BigInteger(rsaParams.Modulus);
_exponent = new BigInteger(rsaParams.Exponent);
}
// Examle for the proper use of try - catch blocks: Informing the main app where and why the Exception occurred
catch (XmlSyntaxException ex) // Not an xml file
{
string excReason = "Exception occurred at LoadKeyFromXml(), Selected file is not a valid xml file.";
Debug.WriteLine(excReason + " Exception Message: " + ex.Message);
throw new Exception(excReason, ex);
}
catch (CryptographicException ex) // Not a Key file
{
string excReason = "Exception occurred at LoadKeyFromXml(), Selected xml file is not a public key file.";
Debug.WriteLine(excReason + " Exception Message: " + ex.Message);
throw new Exception(excReason, ex);
}
catch (Exception ex) // other exception, hope the ex.message will help
{
string excReason = "General Exception occurred at LoadKeyFromXml().";
Debug.WriteLine(excReason + " Exception Message: " + ex.Message);
throw new Exception(excReason, ex);
}
}
/// <summary>
/// 生成RSA密钥对
/// </summary>
/// <param name="keyType"></param>
/// <param name="keySize"></param>
/// <returns></returns>
public static RsaKeyPair GenerateKeyPair(RsaKeyType keyType, int keySize)
{
return(Rsa.GenerateKeyPair(keyType, keySize));
}
/// <summary>
/// 生成rsa秘钥
/// </summary>
/// <param name="rsaKeyType">密钥类型</param>
/// <param name="length">密钥长度</param>
/// <returns></returns>
public RsaKey GenerateRsaKeys(RsaKeyType rsaKeyType = RsaKeyType.XML, int length = 1024)
{
return(RsaCrypt.GenerateRsaKeys(rsaKeyType, length));
}
