public static string RsaDecrypt(this string encryptText)
{
try
{
//first, get our bytes back from the base64 string ...
var bytesCypherText = Convert.FromBase64String(encryptText);
//we want to decrypt, therefore we need a csp and load our private key
var pemReader = new PemReader(File.OpenText(@"privatekey.pem"));
var rsaCryptoServiceProvider = new RSACryptoServiceProvider();
rsaCryptoServiceProvider.ImportParameters(pemReader.ReadPrivatekey());
//decrypt and strip pkcs#1.5 padding
var bytesPlainTextData = rsaCryptoServiceProvider.Decrypt(bytesCypherText, false);
//get our original plainText back...
var plainTextData = Encoding.UTF8.GetString(bytesPlainTextData);
return(plainTextData);
}
catch (Exception e)
{
Console.WriteLine(e);
throw;
}
}
private void InitializeRsa()
{
using (RSA publicRsa = RSA.Create())
{
var publicKeyXml = _settings.UseRsaFilePath ?
System.IO.File.ReadAllText(_settings.RsaPublicKeyXML) :
_settings.RsaPublicKeyXML;
RSACryptoServiceProviderExtensions.FromXmlString(publicRsa, publicKeyXml);
_issuerSigningKey = new RsaSecurityKey(publicRsa);
}
if (_settings.RsaPrivateKey.Empty())
{
return;
}
using (RSA privateRsa = RSA.Create())
{
if (_settings.UseRsaFilePath)
{
using (var streamReader = File.OpenText(_settings.RsaPrivateKey))
{
var pemReader = new PemReader(streamReader);
privateRsa.ImportParameters(pemReader.ReadPrivatekey());
}
}
else
{
using (var stringReader = new StringReader(_settings.RsaPrivateKey))
{
var pemReader = new PemReader(stringReader);
privateRsa.ImportParameters(pemReader.ReadPrivatekey());
}
}
var privateKey = new RsaSecurityKey(privateRsa);
_signingCredentials = new SigningCredentials(privateKey, SecurityAlgorithms.RsaSha256);
}
}
