(Objective-C) Generate an ECDSA Key

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Note: This example requires Chilkat v11.0.0 or greater.

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#import <CkoPrng.h>
#import <NSString.h>
#import <CkoEcc.h>
#import <CkoPrivateKey.h>

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

// Create a Fortuna PRNG and seed it with system entropy.
// This will be our source of random data for generating the ECC private key.
CkoPrng *fortuna = [[CkoPrng alloc] init];
NSString *entropy = [fortuna GetEntropy: [NSNumber numberWithInt: 32] encoding: @"base64"];
BOOL success = [fortuna AddEntropy: entropy encoding: @"base64"];

CkoEcc *ecc = [[CkoEcc alloc] init];

// Generate a random ECC private key on the secp256r1 curve.
// Chilkat also supports other curves, such as secp384r1, secp521r1, and secp256k1.

CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init];
success = [ecc GenKey: @"secp256r1" prng: fortuna privKey: privKey];
if (success != YES) {
    NSLog(@"%@",ecc.LastErrorText);
    return;
}

NSLog(@"%@",[privKey GetXml]);

// Save the private key to PKCS8 encrypted PEM
// (The private key can be saved in a variety of different formats. See the online reference documentation.)
success = [privKey SavePkcs8EncryptedPemFile: @"pemPassword" path: @"myPemFiles/eccKey123.pem"];
if (success != YES) {
    NSLog(@"%@",privKey.LastErrorText);
}

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