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(Objective-C) Create PKCS7 Attached/Opaque Signature (S/MIME)

Create an S/MIME message with a PKCS7 attached/opaque signature.

Chilkat Objective-C Library Downloads

MAC OS X (Cocoa) Libs

iOS Libs

#import <CkoMime.h>
#import <CkoCert.h>
#import <NSString.h>

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

CkoMime *mime = [[CkoMime alloc] init];

// 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.
// Load a PFX file into a certificate object.
CkoCert *cert = [[CkoCert alloc] init];
NSString *pfxFilepath = @"pfxFiles/something.pfx";
NSString *pfxPassword = @"secret";
BOOL success = [cert LoadPfxFile: pfxFilepath password: pfxPassword];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

// Create a very simple MIME message to be signed:
success = [mime AddHeaderField: @"Subject" value: @"This is a test"];
success = [mime AddHeaderField: @"MyCustomHeader" value: @"abc123"];
mime.ContentType = @"text/plain";
[mime SetBody: @"This is a plain-text body."];

// Examine the MIME prior to signing:
NSLog(@"%@",@"--- MIME prior to signing ---");
NSLog(@"%@",[mime GetMime]);

// 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 == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

// Examine the signed MIME
NSLog(@"%@",@"--- MIME converted to PKCS7 signed-data ---");
NSLog(@"%@",[mime GetMime]);

// 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"
// 
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// 

// ------------------------------------------------------------------------------
 

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