Objective-C

Set the Decryption Certificate and Private Key

Demonstrates the Chilkat Email.SetDecryptCert2 method, which explicitly provides a certificate and its corresponding private key as separate objects for decrypting a received encrypted email. Set them before loading the encrypted message. This example loads a .cer certificate and a PEM private key, sets both, then loads an encrypted email.

Background: Sometimes the certificate and its private key are stored separately — a public .cer file plus a PEM (or other format) key file — rather than combined in a PFX. SetDecryptCert2 accepts the two objects individually, which is the natural fit for that arrangement. It is the two-object counterpart to SetDecryptCert, which takes a single certificate that already carries its private key.

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Objective-C

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

BOOL success = NO;

//  Demonstrates the SetDecryptCert2 method, which explicitly provides a certificate and its
//  corresponding private key (as separate objects) for decrypting a received encrypted
//  email.  Set them before loading the encrypted email.

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

//  Load the certificate (public) and the matching private key from separate files.
CkoCert *cert = [[CkoCert alloc] init];
success = [cert LoadFromFile: @"qa_data/certs/recipient.cer"];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return true;
}

CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init];
success = [privKey LoadPemFile: @"qa_data/certs/recipient_privkey.pem"];
if (success == NO) {
    NSLog(@"%@",privKey.LastErrorText);
    return true;
}

//  Provide the certificate and private key to use for decryption.
success = [email SetDecryptCert2: cert key: privKey];
if (success == NO) {
    NSLog(@"%@",email.LastErrorText);
    return true;
}

//  Load the encrypted email; Chilkat decrypts it using the certificate and key.
success = [email LoadEml: @"qa_data/eml/encrypted.eml"];
if (success == NO) {
    NSLog(@"%@",email.LastErrorText);
    return true;
}

NSLog(@"%@%d",@"Decrypted = ",email.Decrypted);

//  Note: Paths such as "qa_data/..." are relative local filesystem paths,
//  relative to the current working directory of the running application.