Objective-C

Add a PFX Source (BinData) for S/MIME Decryption

Demonstrates the Chilkat Imap.AddPfxSourceBd method, which adds PFX data held in a BinData as a source of certificates and private keys for S/MIME processing. The first argument is the BinData and the second is the PFX password. Call it once for each additional source.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: When downloading encrypted (S/MIME) email, Chilkat needs the recipient's private key to decrypt it. Adding one or more PFX sources gives Chilkat a pool of keys to search; the matching key is used automatically as messages are fetched. The BinData form is handy when the PFX comes from memory — a database blob or a downloaded buffer — rather than a file on disk. On Windows and macOS the system certificate stores are also searched automatically.

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Objective-C

#import <CkoImap.h>
#import <CkoBinData.h>
#import <NSString.h>

BOOL success = NO;

//  Demonstrates the Imap.AddPfxSourceBd method, which adds PFX data (from a BinData) as a
//  source of certificates and private keys for S/MIME decryption.  The 1st argument is the
//  BinData containing the PFX, and the 2nd is the PFX password.

CkoImap *imap = [[CkoImap alloc] init];

imap.Ssl = YES;
imap.Port = [NSNumber numberWithInt:993];

success = [imap Connect: @"imap.example.com"];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

success = [imap Login: @"user@example.com" password: @"myPassword"];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

//  Load the PFX data into a BinData.
CkoBinData *bdPfx = [[CkoBinData alloc] init];
success = [bdPfx LoadFile: @"qa_data/smime.pfx"];
if (success == NO) {
    NSLog(@"%@",bdPfx.LastErrorText);
    return;
}

//  The PFX password is not hard-coded in source.  Insert code here to obtain it from an
//  interactive prompt, environment variable, or a secrets vault.
NSString *pfxPassword = 0;

//  Add the PFX as a source for S/MIME certificates and private keys.  Call once per source.
success = [imap AddPfxSourceBd: bdPfx password: pfxPassword];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}

//  Messages downloaded after this are automatically decrypted when a matching key is found.

success = [imap Disconnect];
if (success == NO) {
    NSLog(@"%@",imap.LastErrorText);
    return;
}