(Objective-C) Decrypt a .p7m File (using a PFX)

Objective-C sample code showing how to decrypt a .p7m using a .p12 / .pfx certificate w/ private key.

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#import <CkoCrypt2.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];

// Use a digital certificate and private key from a PFX file (.pfx or .p12).
NSString *pfxPath = @"myCertAndKey.pfx";
NSString *pfxPassword = @"test123";

BOOL success = [crypt AddPfxSourceFile: pfxPath password: pfxPassword];
if (success != YES) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

// Set the  outPath to whatever is appropriate.
// If you are decrypting a PDF, your output might be "out.pdf"...
NSString *inPath = @"smime.p7m";
NSString *outPath = @"original.txt";

// Indicate that we're doing public key decryption (i.e. PKCS7)
crypt.CryptAlgorithm = @"pki";

success = [crypt CkDecryptFile: inPath destFile: outPath];
if (success == NO) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

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