(Objective-C) Generate an RSA Key and Save to Encrypted PEM

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Demonstrates how to generate an RSA key and save to an encrypted PEM file.

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

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

// Generate a 2048-bit key.
BOOL success = [rsa GenerateKey: [NSNumber numberWithInt: 2048]];
if (success == NO) {
    NSLog(@"%@",rsa.LastErrorText);
    return;
}

CkoPrivateKey *privKey = [rsa ExportPrivateKeyObj];
NSString *password = @"secret";
// Saving to a relative path (from the current working directory of the process).
NSString *path = @"rsaKeys/myTestRsaPrivate.pem";
// Encrypt the PEM using 256-bit AES encryption.
privKey.Pkcs8EncryptAlg = @"aes256";
success = [privKey SavePkcs8EncryptedPemFile: password path: path];
if (success == NO) {
    NSLog(@"%@",privKey.LastErrorText);
    return;
}

// 

// We can also save the public key.
// There is no need to encrypt public keys.
CkoPublicKey *pubKey = [rsa ExportPublicKeyObj];
path = @"rsaKeys/myTestRsaPublic.pem";
// Choose PKCS1 or PKCS8
// We'll choose PKCS8.
BOOL preferPkcs1 = NO;
success = [pubKey SavePemFile: preferPkcs1 path: path];
if (success == NO) {
    NSLog(@"%@",pubKey.LastErrorText);
    return;
}

// 

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