(Objective-C) Transition from Email.GetSignedByCertChain to Email.LastSignerCert

Provides instructions for replacing deprecated GetSignedByCertChain method calls with LastSignerCert.

Note: This example requires Chilkat v11.0.0 or greater.

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#import <CkoEmail.h>
#import <CkoCertChain.h>
#import <CkoCert.h>

CkoEmail *email = [[CkoEmail alloc] init];

// ...
// ...

// ------------------------------------------------------------------------
// The GetSignedByCertChain method is deprecated:

CkoCertChain *certChainObj = [email GetSignedByCertChain];
if (email.LastMethodSuccess == NO) {
    NSLog(@"%@",email.LastErrorText);
    return;
}

// ...
// ...

// ------------------------------------------------------------------------
// Do the equivalent using LastSignerCert to get the signing certificate,
// then build the cert chain from the signing certificate object.

CkoCert *signerCert = [[CkoCert alloc] init];
BOOL success = [email LastSignerCert: [NSNumber numberWithInt: 0] cert: signerCert];
if (success == NO) {
    NSLog(@"%@",email.LastErrorText);
    return;
}

// Get the certificate chain from the signer certificate.
CkoCertChain *certChain = [[CkoCertChain alloc] init];
success = [signerCert BuildCertChain: certChain];
if (success == NO) {
    NSLog(@"%@",signerCert.LastErrorText);
    return;
}