(Objective-C) Load .eml and Decrypt (smime.p7m)

Loads an encrypted email from a .eml file and decrypts using certificate w/ private key found in a .p12 (or .pfx) file.

The Content-Type and Content-Disposition email headers of the email to be decrypted look similar to this:

Content-Type: application/x-pkcs7-mime; smime-type=enveloped-data;
	name="smime.p7m"
Content-Disposition: attachment; filename="smime.p7m"

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#import <CkoEmail.h>

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

BOOL success;

// Add a PFX (or .p12) to be used for decryption
success = [email AddPfxSourceFile: @"myCert.p12" password: @"passwordForP12"];
if (success != YES) {
    NSLog(@"%@",email.LastErrorText);
    return;
}

// Loading the .eml automatically decrypts.
success = [email LoadEml: @"encrypted.eml"];
if (success != YES) {
    NSLog(@"%@",email.LastErrorText);
    return;
}

// The email now exists as it was prior to encryption.
// Your app may access the email's subject, body, attachments,
// etc. using the Chilkat Email API...

// Save the decrypted email:
success = [email SaveEml: @"decrypted.eml"];
if (success != YES) {
    NSLog(@"%@",email.LastErrorText);
    return;
}

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