(Objective-C) PKCS11 Generate a Session EC Key on the HSM

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Generates an EC key on the smart card or token and returns the public and private key handles. The generated EC key exists only for the duration of the PKCS11 session.

Note: This example requires Chilkat v9.5.0.96 or later.

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#import <CkoPkcs11.h>
#import <NSString.h>
#import <CkoJsonObject.h>
#import <CkoPublicKey.h>

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

// Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

CkoPkcs11 *pkcs11 = [[CkoPkcs11 alloc] init];

// Use the PKCS11 driver (.dll, .so, .dylib) for your particular HSM.
// (The format of the path will change with the operating system.  Obviously, "C:/" is not used on non-Windows systems.
pkcs11.SharedLibPath = @"C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll";

// Establish a logged-on session.
NSString *pin = @"0000";
int userType = 1;
BOOL success = [pkcs11 QuickSession: [NSNumber numberWithInt: userType] pin: pin];
if (success == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    return;
}

// Specify attributes and abilities (how this key can be used) by providing a JSON template.
// One template is for the public key, and the other for the private key.
CkoJsonObject *pubKeyAttr = [[CkoJsonObject alloc] init];

// Allow the public key to be used for signature verification
[pubKeyAttr UpdateBool: @"verify" value: YES];

// Specify the kind of EC key to generate by the curve name
// Possible curve names are:
// secp256r1  (also known as P-256 and prime256v1)
// secp384r1  (also known as P-384)
// secp521r1  (also known as P-521)
// secp256k1 (This is the curve used for Bitcoin)
// secp192r1
// secp224r1
// brainpoolP160r1
// brainpoolP192r1
// brainpoolP192r1
// brainpoolP224r1
// brainpoolP256r1
// brainpoolP320r1
// brainpoolP384r1
// brainpoolP512r1
// Note: Your smart card or token might not support all of the above EC curves (assuming it supports EC at all).

// This attribute is required.
[pubKeyAttr UpdateString: @"ec_params" value: @"secp256r1"];

CkoJsonObject *privKeyAttr = [[CkoJsonObject alloc] init];

// Generate a session EC key.
// A session key exists only for the duration of the PKS11 session.
// To generate an EC key that resides on the HSM, set the "token" attribute equal to YES
[privKeyAttr UpdateBool: @"token" value: NO];

// Allow the private key to be used for signing.
[privKeyAttr UpdateBool: @"sign" value: YES];

// Provide a JSON object to receive the public and private key handles.
CkoJsonObject *jsonHandles = [[CkoJsonObject alloc] init];
jsonHandles.EmitCompact = NO;

// Provide a Chilkat public key object to receive the public key.
CkoPublicKey *pubKey = [[CkoPublicKey alloc] init];

success = [pkcs11 GenEcKey: pubKeyAttr privateAttrs: privKeyAttr jsonOut: jsonHandles pubKey: pubKey];
if (success == NO) {
    NSLog(@"%@",pkcs11.LastErrorText);
    NSLog(@"%@",@"Failed to generate an EC key.");
}
else {
    // Sample JSON handles:
    // {
    //   "public_key_handle": 18415630,
    //   "private_key_handle": 74842125
    // }
    NSLog(@"%@",[jsonHandles Emit]);
    NSLog(@"%@%d",@"public_key_handle: ",[jsonHandles UIntOf: @"public_key_handle"]);
    NSLog(@"%@%d",@"private_key_handle: ",[jsonHandles UIntOf: @"private_key_handle"]);
    NSLog(@"%@",@"public key JWK:");
    NSLog(@"%@",[pubKey GetJwk]);
    // Sample JWK:
    // {"kty":"EC","crv":"P-256","x":"EDy-Sxl0DZ8tvzy_qnIYl6DYPFjTVnyJ2I9ZTCfKds4","y":"yBZ4HK2yF7F7ZEOn59CgTQp2ApQJ8ZOF736yZxY6LOE"}
    NSLog(@"%@",@"Success.");
}

[pkcs11 Logout];
[pkcs11 CloseSession];