Objective-C
Objective-C
Sign MIME using RSASSA-PSS with SHA256
See more MIME Examples
Demonstrates how to sign an MIME using the RSASSA-PSS signing algorithm with the SHA256 hash algorithm.Chilkat Objective-C Downloads
#import <CkoMime.h>
#import <CkoStringBuilder.h>
#import <CkoPfx.h>
#import <CkoCert.h>
BOOL success = NO;
// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
CkoMime *mime = [[CkoMime alloc] init];
// Create a MIME message to sign.
[mime NewMultipartMixed];
[mime AddHeaderField: @"someHeader1" value: @"Some value 1"];
[mime AddHeaderField: @"someHeader2" value: @"Some value 2"];
CkoMime *part0 = [[CkoMime alloc] init];
[part0 AddHeaderField: @"hdrA" value: @"Some value A"];
[part0 AddHeaderField: @"hdrB" value: @"Some value B"];
part0.ContentType = @"text/plain";
[part0 SetBody: @"This is the plain-text body."];
CkoMime *part1 = [[CkoMime alloc] init];
[part1 AddHeaderField: @"hdrX" value: @"Some value X"];
[part1 AddHeaderField: @"hdrY" value: @"Some value Y"];
part1.ContentType = @"text/xml";
[part1 SetBody: @"<a>This is the XML body</a>"];
[mime AppendPart: part0];
[mime AppendPart: part1];
// The MIME to be signed:
CkoStringBuilder *sbUnsignedMime = [[CkoStringBuilder alloc] init];
[mime GetMimeSb: sbUnsignedMime];
NSLog(@"%@",[sbUnsignedMime GetAsString]);
// Content-Type: multipart/mixed; boundary="------------080303020600020604010008"
// someHeader1: Some value 1
// someHeader2: Some value 2
//
// --------------080303020600020604010008
// hdrA: Some value A
// hdrB: Some value B
// Content-Type: text/plain
//
// This is the plain-text body.
// --------------080303020600020604010008
// hdrX: Some value X
// hdrY: Some value Y
// Content-Type: text/xml
//
// <a>This is the XML body</a>
// --------------080303020600020604010008--
//
// 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.)
CkoPfx *pfx = [[CkoPfx alloc] init];
success = [pfx LoadPfxFile: @"qa_data/rsassa-pss/privatekey.pfx" password: @"PFX_PASSWORD"];
if (success == NO) {
NSLog(@"%@",pfx.LastErrorText);
return;
}
// 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.)
CkoCert *cert = [[CkoCert alloc] init];
success = [pfx CertAt: [NSNumber numberWithInt: 0] cert: cert];
if (success == NO) {
NSLog(@"%@",pfx.LastErrorText);
return;
}
// Indicate that RSASSA-PSS with SHA256 should be used.
mime.SigningAlg = @"pss";
mime.SigningHashAlg = @"sha256";
// Add a detached signature.
success = [mime AddDetachedSignature: cert];
if (success != YES) {
NSLog(@"%@",mime.LastErrorText);
return;
}
// Show the clear-signed MIME. (see the sample output below)
NSLog(@"%@",@"-------------------------------------------------------------");
NSLog(@"%@",@"Clear-signed MIME using detached signature:");
NSLog(@"%@",@"-------------------------------------------------------------");
NSLog(@"%@",[mime GetMime]);
// Restore the original unsigned MIME, and this time create an opaque signature.
[mime LoadMime: [sbUnsignedMime GetAsString]];
// Sign using an opaque signature
success = [mime ConvertToSigned: cert];
if (success != YES) {
NSLog(@"%@",mime.LastErrorText);
return;
}
// Show the opaque-signed MIME. (see the sample output below)
NSLog(@"%@",@"-------------------------------------------------------------");
NSLog(@"%@",@"Opaque-signed MIME :");
NSLog(@"%@",@"-------------------------------------------------------------");
NSLog(@"%@",[mime GetMime]);
NSLog(@"%@",@"Success.");
// -----------------------------------------------
// This is sample output for the clear-signed MIME:
// -----------------------------------------------
//
// Content-Type: multipart/signed; boundary="----=_NextPart_672_c95a_97b64c9a.90b5204d";
// protocol="application/x-pkcs7-signature";
// micalg=sha256
//
// ------=_NextPart_672_c95a_97b64c9a.90b5204d
// Content-Type: multipart/mixed; boundary="------------030207090102000301050504"
// someHeader1: Some value 1
// someHeader2: Some value 2
//
// --------------030207090102000301050504
// hdrA: Some value A
// hdrB: Some value B
// Content-Type: text/plain
//
// This is the plain-text body.
// --------------030207090102000301050504
// hdrX: Some value X
// hdrY: Some value Y
// Content-Type: text/xml
//
// <a>This is the XML body</a>
// --------------030207090102000301050504--
//
// ------=_NextPart_672_c95a_97b64c9a.90b5204d
// Content-Transfer-Encoding: base64
// Content-Type: application/x-pkcs7-signature; name="smime.p7s"
// Content-Disposition: attachment; filename="smime.p7s"
//
// MIIG5wYJKoZIhvcNAQcCoIIG2DCCBtQCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
// ggL4MIIC9DCCAl2gAwIBAgIJAMPsJCT11cniMA0GCSqGSIb3DQEBCwUAMIGSMQswCQYDVQQGEwJB
// VTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEhMB8GA1UECgwYSW50ZXJu
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// neC8qw==
//
// ------=_NextPart_672_c95a_97b64c9a.90b5204d--
//
// -----------------------------------------------
// This is sample output for the opaque-signed MIME:
// -----------------------------------------------
// Content-Type: application/x-pkcs7-mime; name="smime.p7m"; smime-type="signed-data"
// someHeader1: Some value 1
// someHeader2: Some value 2
// Content-Disposition: attachment; filename="smime.p7m"
// Content-Transfer-Encoding: base64
//
// MIIItAYJKoZIhvcNAQcCoIIIpTCCCKECAQExDzANBglghkgBZQMEAgEFADCCAdYGCSqGSIb3DQEH
// AaCCAccEggHDQ29udGVudC1UeXBlOiBtdWx0aXBhcnQvbWl4ZWQ7IGJvdW5kYXJ5PSItLS0tLS0t
// LS0tLS0wMDA2MDcwNzA3MDcwMTA1MDAwMTA5MDciDQpzb21lSGVhZGVyMTogU29tZSB2YWx1ZSAx
// DQpzb21lSGVhZGVyMjogU29tZSB2YWx1ZSAyDQoNCi0tLS0tLS0tLS0tLS0tMDAwNjA3MDcwNzA3
// MDEwNTAwMDEwOTA3DQpoZHJBOiBTb21lIHZhbHVlIEENCmhkckI6IFNvbWUgdmFsdWUgQg0KQ29u
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//