protected RSACryptoServiceProvider GetRsaProvider()
{
var rsaParameters = new RSAParameters();
if (HasPrivateKey)
{
rsaParameters = PemUtilsHelper.ToRSAParameters(PrivateKey);
}
else
{
rsaParameters = PemUtilsHelper.ToRSAParameters(PublicKey);
}
var rsa = new RSACryptoServiceProvider();
rsa.ImportParameters(rsaParameters);
return(rsa);
}
public bool ValidSignature(string data, string base64Data, HashAlgorithmName hashAlgorithm)
{
try
{
var sha = new SHA256CryptoServiceProvider();
var hash = sha.ComputeHash(Encoding.UTF8.GetBytes(data));
var signature = Convert.FromBase64String(base64Data);
using RSA rsa = RSA.Create();
var rsaParameters = PemUtilsHelper.ToRSAParameters(PrivateKey);
rsa.ImportParameters(rsaParameters);
return(rsa.VerifyHash(hash, signature, hashAlgorithm, RSASignaturePadding.Pss));
}
catch (Exception ex)
{
throw new Exception("The public key could not be properly verified.", ex);
}
}
public string SignWithPrivateKey(string data, HashAlgorithmName hashAlgorithm, bool useIndent = false)
{
try
{
using RSA rsa = RSA.Create();
var rsaParameters = PemUtilsHelper.ToRSAParameters(PrivateKey);
rsa.ImportParameters(rsaParameters);
var sha = new SHA256CryptoServiceProvider();
var hash = sha.ComputeHash(Encoding.UTF8.GetBytes(data));
var signature = rsa.SignHash(hash, hashAlgorithm, RSASignaturePadding.Pss);
if (useIndent)
{
return(Convert.ToBase64String(signature, Base64FormattingOptions.InsertLineBreaks));
}
return(Convert.ToBase64String(signature));
}
catch (Exception ex)
{
throw new Exception("Data could not signing.", ex);
}
}
