“Invalid provider type specified” CryptographicException when trying to load private key of certificate

Question

I\'m trying to read the private key of a certificate which has been shared with me by a third-party service provider, so I can use it to encrypt some XML before sending it t

Answer 1

I faced the same problem in our IIS app:

 System.Security.Cryptography.Pkcs.PkcsUtils.CreateSignerEncodeInfo(CmsSigner signer, Boolean silent)
    System.Security.Cryptography.Pkcs.SignedCms.Sign(CmsSigner signer, Boolean silent)
    System.Security.Cryptography.Pkcs.SignedCms.ComputeSignature(CmsSigner signer, Boolean silent)

Regenerating certs as mentioned here didnt help. I also noticed that test console app works fine under pool user.

Problem disappeared after clearing "Enable 32-bit Applications" setting for IIS app pool.