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Create PKCS7 Attached/Opaque Signature (S/MIME)Create an S/MIME message with a PKCS7 attached/opaque signature.
Chilkat.Mime mime = new Chilkat.Mime(); bool success; success = mime.UnlockComponent("Anything for 30-day trial"); if (success == false) { textBox1.Text += mime.LastErrorText + "\r\n"; return; } // Load a certificate w/ private key for signing. // There are many ways of getting a certificate object: // from a pfx file, from .cer and private-key files, from the // Windows registry-based certificate stores, etc. // For this example, we'll use a pre-installed cert from // a certificate store. Chilkat.Cert cert = new Chilkat.Cert(); success = cert.LoadByCommonName("Chilkat Software, Inc."); if (success == false) { textBox1.Text += cert.LastErrorText + "\r\n"; return; } // Create a very simple MIME message to be signed: mime.AddHeaderField("Subject","This is a test"); mime.AddHeaderField("MyCustomHeader","abc123"); mime.ContentType = "text/plain"; mime.SetBody("This is a plain-text body."); // Examine the MIME prior to signing: textBox1.Text += "--- MIME prior to signing ---" + "\r\n"; textBox1.Text += mime.GetMime() + "\r\n"; // The MIME prior to signing looks like this: // ------------------------------------------------------------------------------- // Subject: This is a test MyCustomHeader: abc123 Content-Type: text/plain This is a plain-text body. // ------------------------------------------------------------------------------- // The default hash algorithm used in the signing process is "SHA1". // To change it, set the SigningHashAlg property: mime.SigningHashAlg = "SHA256"; // Convert the MIME to PKCS7 signed-data. success = mime.ConvertToSigned(cert); if (success == false) { textBox1.Text += mime.LastErrorText + "\r\n"; return; } // Examine the signed MIME textBox1.Text += "--- MIME converted to PKCS7 signed-data ---" + "\r\n"; textBox1.Text += mime.GetMime() + "\r\n"; // The MIME after signing looks like this: // ------------------------------------------------------------------------------- // Subject: This is a test MyCustomHeader: abc123 Content-Disposition: attachment; filename="smime.p7m" Content-Transfer-Encoding: base64 Content-Type: application/x-pkcs7-mime; name="smime.p7m"; smime-type="signed-data" MIIObAYJKoZIhvcNAQcCoIIOXTCCDlkCAQExDzANBglghkgBZQMEAgEFADB2BgkqhkiG9w0BBwGg aQRnU3ViamVjdDogVGhpcyBpcyBhIHRlc3QNCk15Q3VzdG9tSGVhZGVyOiBhYmMxMjMNCkNvbnRl bnQtVHlwZTogdGV4dC9wbGFpbg0KDQpUaGlzIGlzIGEgcGxhaW4tdGV4dCBib2R5LqCCCaAwggRm MIIDTqADAgECAhBEvgyLUAAktBHTNi3gs18bMA0GCSqGSIb3DQEBBQUAMIGVMQswCQYDVQQGEwJV 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