次のコードがありますが、コードを実行するとエラーSystem.Security.Cryptography.CryptographicException: Cannot find the original signer が表示されます。、なぜこれが起こるのですか?証明書の設定が間違っているためですか?
public byte[] GetSignature(string message, X509Certificate2 signingCertificate,
X509Certificate2 encryptionCertificate)
{
byte[] messageBytes = Encoding.ASCII.GetBytes(message);
SignedCms signedCms = new SignedCms(new ContentInfo(messageBytes), true);
CmsSigner cmsSigner = new CmsSigner(SubjectIdentifierType.IssuerAndSerialNumber, signingCertificate);
cmsSigner.IncludeOption = X509IncludeOption.WholeChain;
if (encryptionCertificate != null)
{
cmsSigner.Certificates.Add(encryptionCertificate);
}
Pkcs9SigningTime signingTime = new Pkcs9SigningTime();
cmsSigner.SignedAttributes.Add(signingTime);
signedCms.ComputeSignature(cmsSigner, false);
return signedCms.Encode();
}