C
C
Send a Signed Email using RSASSA-PSS with SHA256
See more SMTP Examples
Demonstrates how to sign and send an email using the RSASSA-PSS signing algorithm with the SHA256 hash algorithm. .Chilkat C Downloads
#include <C_CkPfx.h>
#include <C_CkEmail.h>
#include <C_CkCert.h>
#include <C_CkMailMan.h>
void ChilkatSample(void)
{
BOOL success;
HCkPfx pfx;
HCkEmail email;
HCkCert cert;
HCkMailMan mailman;
success = FALSE;
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
// Get a digital certificate with private key from a .pfx
// (Chilkat has many different ways to provide a cert + private key for siging.
// Using a PFX is just one possible option.)
pfx = CkPfx_Create();
success = CkPfx_LoadPfxFile(pfx,"qa_data/rsassa-pss/privatekey.pfx","PFX_PASSWORD");
if (success == FALSE) {
printf("%s\n",CkPfx_lastErrorText(pfx));
CkPfx_Dispose(pfx);
return;
}
email = CkEmail_Create();
// Create a simple email.
CkEmail_putSubject(email,"Sample RSASSA-PSS Signed Email");
CkEmail_putBody(email,"Sample RSASSA-PSS Signed Email");
CkEmail_putFrom(email,"from_name@mydomain.com");
// Add one ore more recipients..
CkEmail_AddTo(email,"Chilkat Support","support@chilkatsoft.com");
CkEmail_AddTo(email,"Chilkat GMail","chilkat.support@gmail.com");
// Indicate that the email is to be signed, and that we want to use RSASSA-PSS.
CkEmail_putSendSigned(email,TRUE);
CkEmail_putSigningAlg(email,"pss");
CkEmail_putSigningHashAlg(email,"sha256");
// Get the certificate to be used for signing.
// (The typical case for a PFX is that it contains a cert with an associated private key,
// as well as other certificates in the chain of authentication. The cert with the private
// key should be in the first position at index 0.)
cert = CkCert_Create();
success = CkPfx_CertAt(pfx,0,cert);
if (success == FALSE) {
printf("%s\n",CkPfx_lastErrorText(pfx));
CkPfx_Dispose(pfx);
CkEmail_Dispose(email);
CkCert_Dispose(cert);
return;
}
// Tell the email object to use this cert (and private key) for signing.
CkEmail_SetSigningCert(email,cert);
mailman = CkMailMan_Create();
// Set the SMTP settings for your email account on your mail server.
CkMailMan_putSmtpUsername(mailman,"SMTP_LOGIN");
CkMailMan_putSmtpPassword(mailman,"SMTP_PASSWORD");
CkMailMan_putSmtpHost(mailman,"MY_SMTP_DOMAIN_OR_IP");
CkMailMan_putSmtpPort(mailman,587);
CkMailMan_putStartTLS(mailman,TRUE);
// Signed email can be sent in two different ways.
// In a multipart/signed email, the signature is attached as a separate MIME part.
// In an opaque email (signedData) the content of the email is encapsulated within the signature
// and the email is sent as "application/pkcs7-mime".
// Either should be fine, but some receiving systems might require one or the other..
CkMailMan_putOpaqueSigning(mailman,FALSE);
// Send the email. The mailman will sign the email as directed by the
// property settings of the email object.
success = CkMailMan_SendEmail(mailman,email);
if (success == FALSE) {
printf("%s\n",CkMailMan_lastErrorText(mailman));
CkPfx_Dispose(pfx);
CkEmail_Dispose(email);
CkCert_Dispose(cert);
CkMailMan_Dispose(mailman);
return;
}
success = CkMailMan_CloseSmtpConnection(mailman);
if (success != TRUE) {
printf("Connection to SMTP server not closed cleanly.\n");
}
printf("Mail Sent!\n");
// -----------------------------------------------------------
// This is the MIME of the RSASSA-PSS signed email that was sent
// MIME-Version: 1.0
// Date: Thu, 20 Apr 2017 10:14:58 -0500
// Message-ID: <3682A87344CB3A4FB5EB5BC9908C0C4DA01DA461@CHILKAT13>
// Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha256;
// boundary="------------050103020705000601010800"
// X-Priority: 3 (Normal)
// Subject: Sample RSASSA-PSS Signed Email
// From: support@chilkatsoft.com
// To: "Chilkat Support" <support@chilkatsoft.com>,
// "Chilkat GMail" <chilkat.support@gmail.com>
//
// --------------050103020705000601010800
// Content-Type: text/plain; format=flowed
// Content-Transfer-Encoding: 7bit
//
// Sample RSASSA-PSS Signed Email
// --------------050103020705000601010800
// Content-Transfer-Encoding: base64
// Content-Type: application/pkcs7-signature; name="smime.p7s"
// Content-Disposition: attachment; filename="smime.p7s"
//
// MIIG5wYJKoZIhvcNAQcCoIIG2DCCBtQCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
// ggL4MIIC9DCCAl2gAwIBAgIJAMPsJCT11cniMA0GCSqGSIb3DQEBCwUAMIGSMQswCQYDVQQGEwJB
// VTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEhMB8GA1UECgwYSW50ZXJu
// ZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkqhkiG9w0BCQEWGWFkbWlu
// QGludGVybmV0d2lkZ2V0cy5jb20wHhcNMTYxMTAxMTY1MjMyWhcNMjExMDMxMTY1MjMyWjCBkjEL
// MAkGA1UEBhMCQVUxETAPBgNVBAgMCFZpY3RvcmlhMRIwEAYDVQQHDAlNZWxib3VybmUxITAfBgNV
// BAoMGEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEPMA0GA1UEAwwGV2lkZ2V0MSgwJgYJKoZIhvcN
// AQkBFhlhZG1pbkBpbnRlcm5ldHdpZGdldHMuY29tMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKB
// gQDGIdoCjyavs+F/Rm0VIB4m6O7VL1j+1IqieoR9NEX2GQvu2VCdceyxf9qaw1bxipEvjLwUkw7M
// e+BTlLpWQbBMH87s6KpsC8MVyXhMLpP0oM8NFix/vLz2wdLhUh7CZvJA0plqkJk9bj57QIu+EO1k
// tUHM2DFb6sckvCL2yybD1wIDAQABo1AwTjAdBgNVHQ4EFgQUONKKu2zsXIrinWxIGT654vrcQwsw
// HwYDVR0jBBgwFoAUONKKu2zsXIrinWxIGT654vrcQwswDAYDVR0TBAUwAwEB/zANBgkqhkiG9w0B
// AQsFAAOBgQArFvdi5u9i2QF1Qw+cdC1l7w2Y3+q6RIkln2W8rWJFje00644o8hXy7v46giJCedmF
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// 9ZWS+V9MJajeu44Rf/tU17TLYKjvEjGCA7MwggOvAgEBMIGgMIGSMQswCQYDVQQGEwJBVTERMA8G
// A1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEhMB8GA1UECgwYSW50ZXJuZXQgV2lk
// Z2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkqhkiG9w0BCQEWGWFkbWluQGludGVy
// bmV0d2lkZ2V0cy5jb20CCQDD7CQk9dXJ4jANBglghkgBZQMEAgEFAKCCAjQwGAYJKoZIhvcNAQkD
// MQsGCSqGSIb3DQEHATAcBgkqhkiG9w0BCQUxDxcNMTcwNDIwMTUxNDU4WjAvBgkqhkiG9w0BCQQx
// IgQgoHOtpFiAgti0cwDw46C8wyYSZbhx2yJqJZ/qRE8WPSQwXwYJKoZIhvcNAQkPMVIwUDALBglg
// hkgBZQMEAQIwCgYIKoZIhvcNAwcwDgYIKoZIhvcNAwICAgCAMA0GCCqGSIb3DQMCAgFAMAcGBSsO
// AwIHMA0GCCqGSIb3DQMCAgEoMIGxBgkrBgEEAYI3EAQxgaMwgaAwgZIxCzAJBgNVBAYTAkFVMREw
// DwYDVQQIDAhWaWN0b3JpYTESMBAGA1UEBwwJTWVsYm91cm5lMSEwHwYDVQQKDBhJbnRlcm5ldCBX
// aWRnaXRzIFB0eSBMdGQxDzANBgNVBAMMBldpZGdldDEoMCYGCSqGSIb3DQEJARYZYWRtaW5AaW50
// ZXJuZXR3aWRnZXRzLmNvbQIJAMPsJCT11cniMIGzBgsqhkiG9w0BCRACCzGBo6CBoDCBkjELMAkG
// A1UEBhMCQVUxETAPBgNVBAgMCFZpY3RvcmlhMRIwEAYDVQQHDAlNZWxib3VybmUxITAfBgNVBAoM
// GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEPMA0GA1UEAwwGV2lkZ2V0MSgwJgYJKoZIhvcNAQkB
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// 41wQ5A==
//
// --------------050103020705000601010800--
CkPfx_Dispose(pfx);
CkEmail_Dispose(email);
CkCert_Dispose(cert);
CkMailMan_Dispose(mailman);
}