Why am I getting "Invalid algorithm specified" exception

Question

Here is my code.

X509Certificate pXCert = new X509Certificate2(@"keyStore.p12", "password"); RSACryptoServiceProvider csp = (RSACryptoServiceProvider)pXCert.PrivateKey; string id = CryptoConfig.MapNameToOID("SHA256"); return csp.SignData(File.ReadAllBytes(filePath), id); 

On the last line I'm getting the exception:

System.Security.Cryptography.CryptographicException "Invalid algorithm specified."

What am I doing wrong?

UPDATE:

id = 2.16.840.1.101.3.4.2.1

Answer 1

There is no issue with .NET code or the CSP code you provided.

Your problem is that CSP just doesn’t support SHA 256. You can get further information here

Answer 2

For dot net framework 4.7.0 or higher is not taking the sha1 so configure the below in application start. it's worked fine for me.

 AppContext.SetSwitch("Switch.System.Security.Cryptography.Xml.UseInsecureHashAlgorithms", true);  AppContext.SetSwitch("Switch.System.Security.Cryptography.Pkcs.UseInsecureHashAlgorithms", true);