public bool VerifyData(string originalMessage, string signedMessage)
{
if (string.IsNullOrEmpty(originalMessage))
{
return(false);
}
if (string.IsNullOrEmpty(signedMessage))
{
return(false);
}
if (_publicKey.IsNull())
{
throw new ArgumentException("The public key value for verification has not been provided, you must either provide them or call SignData before attempting to verify data", nameof(PublicKey));
}
bool success;
using (var rsa = CreateCrypto())
{
var encoder = new UTF8Encoding();
byte[] bytesToVerify = encoder.GetBytes(originalMessage);
byte[] signedBytes = Convert.FromBase64String(signedMessage);
rsa.ImportParameters(_publicKey);
success = rsa.VerifyData(bytesToVerify, signedBytes, _hashAlgorithmName, _rsaSignaturePadding);
}
return(success);
}
public string SignData(string message)
{
if (string.IsNullOrEmpty(message))
{
return(null);
}
byte[] signedBytes;
using (var rsa = CreateCrypto())
{
var encoder = new UTF8Encoding();
byte[] originalData = encoder.GetBytes(message);
if (!_privateKey.IsNull())
{
rsa.ImportParameters(_privateKey);
}
else
{
// make new keys accessible to consumers for storage
SetKeys(rsa);
}
signedBytes = rsa.SignData(originalData, 0, originalData.Length, _hashAlgorithmName, _rsaSignaturePadding);
}
return(Convert.ToBase64String(signedBytes));
}
public RsaCrypto(RSAParameters privateKey, RSAParameters publicKey)
{
if (privateKey.IsNull() && publicKey.IsNull())
{
throw new ArgumentException($"Ctor requires at least one key, {nameof(privateKey)} and {nameof(publicKey)} are null or empty");
}
_privateKey = privateKey;
PrivateKey = RsaParamToString(_privateKey);
_publicKey = publicKey;
PublicKey = RsaParamToString(_publicKey);
}