(Objective-C) Generate RSA Public/Private Key Pair and Export to PEM

Objective-C example code showing how to generate an RSA public/private key pair and export to PEM files.

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#import <CkoRsa.h>
#import <NSString.h>
#import <CkoPrivateKey.h>
#import <CkoPublicKey.h>

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

CkoRsa *rsa = [[CkoRsa alloc] init];

// Generate a 1024-bit key.  Chilkat RSA supports
// key sizes ranging from 512 bits to 4096 bits.
BOOL success = [rsa GenerateKey: [NSNumber numberWithInt: 1024]];
if (success != YES) {
    NSLog(@"%@",rsa.LastErrorText);
    return;
}

// Keys are exported in XML format:
NSString *publicKeyXml = [rsa ExportPublicKey];
NSLog(@"%@",publicKeyXml);

NSString *privateKeyXml = [rsa ExportPrivateKey];
NSLog(@"%@",privateKeyXml);

// Save the private key in PEM format:
CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init];
success = [privKey LoadXml: privateKeyXml];
success = [privKey SavePemFile: @"privateKey.pem"];

// Save the public key in PEM format:
CkoPublicKey *pubKey = [[CkoPublicKey alloc] init];
success = [pubKey LoadFromString: publicKeyXml];
success = [pubKey SavePemFile: NO path: @"publicKey.pem"];