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C# UWP/WinRT Examples

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(C# UWP/WinRT) Encrypt using Cert to produce -----BEGIN PKCS7----- ... -----END PKCS7-----

Demonstrates how to encrypt using a certificate to produce output such as:

-----BEGIN PKCS7-----
MIIHPwYJKoZIhvcNAQcEoIIHMDCCBywC ...
...
...
-----END PKCS7-----
The certificate to be used is not your own, but the certificate of the intended recipient of the message.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

//  Specify the encryption to be used.
//  "pki" indicates "Public Key Infrastructure" and will create a PKCS7 encrypted (enveloped) message.
crypt.CryptAlgorithm = "pki";
crypt.Pkcs7CryptAlg = "aes";
crypt.KeyLength = 128;
crypt.OaepHash = "sha256";
crypt.OaepPadding = true;

//  A certificate is needed as the encryption key..
Chilkat.Cert cert = new Chilkat.Cert();
bool success = cert.LoadFromFile("qa_data/certs/testCert.pem");
if (success != true) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

//  Tell the crypt object to use the certificate.
crypt.SetEncryptCert(cert);

string toBeEncrypted = "This string is to be encrypted.";

//  Get the result in multi-line BASE64 MIME format.
crypt.EncodingMode = "base64_mime";

string encryptedStr = crypt.EncryptStringENC(toBeEncrypted);
if (success != true) {
    Debug.WriteLine(crypt.LastErrorText);
    return;
}

//  Make a "-----BEGIN PKCS7-----" ... "-----END PKCS7-----" sandwich...
Chilkat.StringBuilder sb = new Chilkat.StringBuilder();
sb.AppendLine("-----BEGIN PKCS7-----",true);
sb.Append(encryptedStr);
sb.AppendLine("-----END PKCS7-----",true);

string outStr = sb.GetAsString();

Debug.WriteLine(outStr);

//  Sample output:

//  -----BEGIN PKCS7-----
//  MIICYQYJKoZIhvcNAQcDoIICUjCCAk4CAQAxggH5MIIB9QIBADCBsTCBmzELMAkGA1UEBhMCR0Ix
//  GzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgGA1UEChMR
//  Q09NT0RPIENBIExpbWl0ZWQxQTA/BgNVBAMTOENPTU9ETyBTSEEtMjU2IENsaWVudCBBdXRoZW50
//  aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBAhEAuBl4qE2MODB05C5h53M5UDA4BgkqhkiG9w0B
//  AQcwK6APMA0GCWCGSAFlAwQCAQUAoRgwFgYJKoZIhvcNAQEIMAkGBSsOAwIaBQAEggEAyZejlE37
//  awl0bCWVbOCqf9yLSN17mZRamG8FHDh3nNu11G0+oyJtsPDEnSKsQig0V67MZ+hcWV+uf4ytcjyx
//  H0gs5uex+LwkB+c3ZTOt18IYWFtRilg1HFy1ZN3t0D2QbxYy+i1TXOOwp3gAHL45vRCJ0FbKyQ36
//  pKl0XLe+lRvp2EiJCKVjxtX8VcZOKT4xkG7yOARaCQceth6pA58Dg0yzAz7w4nD2UgAlNzrXG69X
//  e+7e7yfBv47RRqFiQqDpCn+fM/PmFbUyqBppMwc64yP+fJek8VyJw2/UaXWWM4iSKSflk90tiHwf
//  loEU3It4arnSv94fZQo0v129aBqpWzBMBgkqhkiG9w0BBwEwHQYJYIZIAWUDBAECBBCohUgm5qX+
//  TE6PxtPCmWi8gCBgbNg39emAB+AqLozm+vSLjZOGfg3M52gccKUJ8tg8XQ==
//  -----END PKCS7-----

 

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