(Objective-C) Convert DSA PEM Private Key to DER

Converts a DSA private key from PEM format to DER. The first part of the example will convert an unencrypted PEM to DER, then 2nd part will convert an encrypted PEM to unencrypted DER.

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#import <CkoDsa.h>
#import <NSString.h>

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

CkoDsa *dsa = [[CkoDsa alloc] init];

// Load a PEM private key.
NSString *pemPrivateKey = 0;
pemPrivateKey = [dsa LoadText: @"dsa_priv.pem"];
// Import the unencrypted PEM into the DSA object.
BOOL success = [dsa FromPem: pemPrivateKey];
if (success != YES) {
    NSLog(@"%@",dsa.LastErrorText);
    return;
}

// Write it out as a DER file:
success = [dsa ToDerFile: @"dsa_priv.der"];
if (success != YES) {
    NSLog(@"%@",dsa.LastErrorText);
    return;
}

// Load an encrypted PEM private key.
pemPrivateKey = [dsa LoadText: @"dsa_privEncrypted.pem"];
// Import the encrypted PEM into the DSA object.
success = [dsa FromEncryptedPem: @"myPassword" pemData: pemPrivateKey];
if (success != YES) {
    NSLog(@"%@",dsa.LastErrorText);
    return;
}

// Write it out as an unencrypted DER file:
success = [dsa ToDerFile: @"dsa_priv2.der"];
if (success != YES) {
    NSLog(@"%@",dsa.LastErrorText);
    return;
}

NSLog(@"%@",@"Finished!");