(Objective-C) PKCS7 Decrypt MIME

Loads a PKCS7 encrypted MIME file and decrypts. The cert and private key used for decryption is loaded from a PFX file.

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#import <CkoMime.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 the MIME
BOOL success = [mime LoadMimeFile: @"encryptedMime.txt"];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

// The AddPfxSourceFile and/or AddPfxSourceData
// methods may be called one or more times (one per PFX)
// to add sources from which the MIME component will
// search for certificates and private keys when decrypting.
NSString *pfxPassword = @"myPassword";
success = [mime AddPfxSourceFile: @"myCertAndPrivateKey.pfx" password: pfxPassword];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

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

// Display the decrypted MIME:
NSLog(@"%@",[mime GetMime]);