(Objective-C) Create CAdES p7m using USB Token or Smartcard on iOS iPhone

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Demonstrates how to create a CAdES p7m, using an HSM (USB token or smart card) connected to an iPhone.

Note: This example requires Chilkat v10.0.0 or greater.

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#import <CkoCert.h>
#import <CkoCrypt2.h>
#import <CkoJsonObject.h>
#import <NSString.h>

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

// When signing with a USB token or smartcard, the only coding difference is how the certificate
// gets loaded.  To load the default certificate from the connected USB token or smartcard, just call
// LoadFromSmartcard with an empty string argument.
// 
// This requires Chilkat v10.0.0 or later.
// 
// ------------------------------------------------------------------------------------------------------------------------------------------------------
// Important: In your Xcode project, you'll need to add the "com.apple.token" entitlement.
// Also, adding the com.apple.token in the "Project > Signing & Capabilities" will actually add $(AppIdentifierPrefix)com.apple.token, which does not work. 
// Edit the entitlements file directly and add only com.apple.token
// If using a Yubikey, you'll only find the certificate if it is added in the Yubikey app as Public.
// ------------------------------------------------------------------------------------------------------------------------------------------------------
CkoCert *cert = [[CkoCert alloc] init];
BOOL success = [cert LoadFromSmartcard: @""];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];

success = [crypt SetSigningCert: cert];
if (success == NO) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

// The CadesEnabled property applies to all methods that create PKCS7 signatures. 
// To create a CAdES-BES signature, set this property equal to true.
crypt.CadesEnabled = YES;

crypt.HashAlgorithm = @"sha256";

CkoJsonObject *signedAttrs = [[CkoJsonObject alloc] init];
[signedAttrs UpdateInt: @"contentType" value: [NSNumber numberWithInt: 1]];
[signedAttrs UpdateInt: @"signingTime" value: [NSNumber numberWithInt: 1]];
[signedAttrs UpdateInt: @"messageDigest" value: [NSNumber numberWithInt: 1]];
[signedAttrs UpdateInt: @"signingCertificateV2" value: [NSNumber numberWithInt: 1]];
crypt.SigningAttributes = [signedAttrs Emit];

// You can sign any type of file..
// ----------------------------------------------------------
// Update to specify the paths to your input and output files.
// ----------------------------------------------------------
NSString *inputXmlPath = @"....";
NSString *outputP7mPath = @"... signed.p7m";

// Create the CAdES-BES attached signature, which contains the original data.
// Chilkat will build the .p7m locally, but will (internally) use ARSS
// to do the RSA signing remotely.
success = [crypt CreateP7M: inputXmlPath p7mPath: outputP7mPath];
if (success == NO) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

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