(Objective-C) Generate an Ed25519 Key Pair

Demonstrates how to generate a new Ed25519 public/private key pair.

Note: This example requires Chilkat v9.5.0.83 or greater.

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#import <CkoEdDSA.h>
#import <CkoPrng.h>
#import <CkoPrivateKey.h>
#import <NSString.h>
#import <CkoJsonObject.h>

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

CkoEdDSA *eddsa = [[CkoEdDSA alloc] init];
CkoPrng *prng = [[CkoPrng alloc] init];
CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init];

// Generates a new eddsa key and stores it in privKey.
BOOL success = [eddsa GenEd25519Key: prng privKey: privKey];
if (success == NO) {
    NSLog(@"%@",eddsa.LastErrorText);
    return;
}

// Examine the ed25519 key in JWK format;
NSString *jwk = [privKey GetJwk];

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json Load: jwk];
json.EmitCompact = NO;
NSLog(@"%@",[json Emit]);

// Sample output:
// {
//   "kty": "OKP",
//   "crv": "Ed25519",
//   "x": "SE2Kne5xt51z1eciMH2T2ftDQp96Gl6FhY6zSQujiP0",
//   "d": "O-eRXewadF0sNyB0U9omcnt8Qg2ZmeK3WSXPYgqe570",
//   "use": "sig"
// }

// In the above JWK, x is the public key, y is the private key.
// Both are 32 bytes and are base64-url encoded.