Decrypt S/MIME using a Certificate with Private Key Access

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Loads a CMS/PKCS #7 encrypted S/MIME message and decrypts it back to the original MIME content.

DecryptUsingCert takes a single certificate that already has access to its associated private key, for example a certificate loaded from a PFX.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

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

BOOL success = NO;

CkoMime *mime = [[CkoMime alloc] init];
success = [mime LoadMimeFile: @"qa_data/encrypted.eml"];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

//  Decrypt using a certificate that already provides access to its private key (for example loaded
//  from a PFX).  The only argument is the certificate.
NSString *pfxPassword = @"myPfxPassword";
CkoCert *cert = [[CkoCert alloc] init];
success = [cert LoadPfxFile: @"qa_data/recipient.pfx" password: pfxPassword];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

success = [mime DecryptUsingCert: cert];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

NSString *body = [mime GetBodyDecoded];
if (mime.LastMethodSuccess == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

NSLog(@"%@",body);