Objective-C

Load a Private Key from a JWK

Demonstrates the Chilkat PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key) JSON. The only argument is the JWK JSON string. Supported key types are RSA, EC, and Ed25519 (kty=OKP).

Background: JWK is the JSON key format used throughout modern web security — JWT signing, OAuth, OpenID Connect — so this loader is what you use to consume a key from a JWK Set or an identity provider. A private JWK includes the private parameters (d and, for RSA, the CRT values); a public-only JWK omits them. As JSON in the clear, a private JWK must be handled as sensitive material.

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Objective-C

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

BOOL success = NO;

//  Demonstrates the PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key)
//  JSON.  The only argument is the JWK JSON string.  Supported key types are RSA, EC, and
//  Ed25519 (kty=OKP).

CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init];

//  A private JWK.  For a real key, "d" (and the other private parameters) would be present.
NSString *jwk = @"{\"kty\":\"EC\",\"crv\":\"P-256\",\"x\":\"...\",\"y\":\"...\",\"d\":\"...\"}";

success = [privKey LoadJwk: jwk];
if (success == NO) {
    NSLog(@"%@",privKey.LastErrorText);
    return;
}

NSLog(@"%@%@%@",@"Loaded a ",privKey.KeyType,@" private key.");