(Objective-C) Create PKCS7 Signed File (.p7m)

Demonstrates how to sign a file to create a .p7m that contains both the file contents and the signature.

Chilkat Objective-C Library Downloads MAC OS X (Cocoa) Libs iOS Libs

#import <CkoCrypt2.h>
#import <CkoCertStore.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.

CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];

CkoCertStore *certStore = [[CkoCertStore alloc] init];

// Load a PFX file into a certificate store object.
BOOL success = [certStore LoadPfxFile: @"myPfx.pfx" password: @"pfxPassword"];
if (success != YES) {
    NSLog(@"%@",certStore.LastErrorText);
    return;
}

// Get the certificate by subject common name.
// This should be the cert within the PFX that also
// has a private key (also stored within the PFX).
CkoCert *cert = [certStore FindCertBySubjectCN: @"myCert"];
if (certStore.LastMethodSuccess == NO) {
    NSLog(@"%@",certStore.LastErrorText);
    return;
}

// Tell the crypt object to use the certificate for signing:
success = [crypt SetSigningCert: cert];

// Sign a file, producing a .p7m as output.
// The input file is unchanged, the test.p7m contains the 
// contents of the input file and the signature.
NSString *inFile = @"test.txt";
NSString *outFile = @"testp7m";
success = [crypt CreateP7M: inFile p7mPath: outFile];
if (success != YES) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

NSLog(@"%@",@"Success!");