private void TestPKCS7Signature(object sender, EventArgs e)
{
BodyPart b = sender as BodyPart;
// Now look at the contents of the body as a signature
System.Security.Cryptography.Pkcs.SignedCms cms = new System.Security.Cryptography.Pkcs.SignedCms();
cms.Decode(b.Data);
foreach (var sig in cms.SignerInfos)
{
if (sig.Certificate.Subject.Contains(From.Address))
{
TrustedSender = true;
break;
}
}
}
/// <inheritdoc />
public byte[] Decrypt(byte[] data)
{
try
{
var env = new System.Security.Cryptography.Pkcs.EnvelopedCms();
env.Decode(data);
env.Decrypt(_allSenderCertificates);
var decryptedData = env.ContentInfo.Content;
var sig = new System.Security.Cryptography.Pkcs.SignedCms();
sig.Decode(decryptedData);
sig.CheckSignature(true);
var verifiedData = sig.ContentInfo.Content;
return verifiedData;
}
catch (Exception ex)
{
throw new ExtraEncryptionException("No certificate for decryption found.", ex);
}
}
/// <inheritdoc />
public byte[] Decrypt(byte[] data)
{
try
{
var env = new System.Security.Cryptography.Pkcs.EnvelopedCms();
env.Decode(data);
env.Decrypt(_allSenderCertificates);
var decryptedData = env.ContentInfo.Content;
var sig = new System.Security.Cryptography.Pkcs.SignedCms();
sig.Decode(decryptedData);
sig.CheckSignature(true);
var verifiedData = sig.ContentInfo.Content;
return(verifiedData);
}
catch (Exception ex)
{
throw new ExtraEncryptionException("No certificate for decryption found.", ex);
}
}
