(Objective-C) Italian FatturaPA (e-Invoice) Signed XML (CADES-BES P7M) using USB SmartCard Reader

Demonstrates Italian e-Invoice (FatturaPA) signing by using a private key stored on a USB smartcard reader.

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

CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];
crypt.VerboseLogging = YES;

CkoCert *cert = [[CkoCert alloc] init];
// Use your smart card user PIN for signing.
cert.SmartCardPin = @"0000";

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

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];

// Load XML such as the following:
//  <p:FatturaElettronica xmlns:p="http://ivaservizi.agenziaentrate.gov.it/docs/xsd/fatture/v1.2" versione="FPR12">
//     <FatturaElettronicaHeader>
//        <DatiTrasmissione>
// 	...
//        </DatiTrasmissione>
//        <CedentePrestatore>
// 	...
//        </CedentePrestatore>
//        <CessionarioCommittente>
// 	...
//        </CessionarioCommittente>
//     </FatturaElettronicaHeader>
//     <FatturaElettronicaBody>
//        <DatiGenerali>
//           <DatiGeneraliDocumento>
// 		...
//           </DatiGeneraliDocumento>
//        </DatiGenerali>
//        <DatiBeniServizi>
// 	...
//        </DatiBeniServizi>
//     </FatturaElettronicaBody>
//  </p:FatturaElettronica>

NSString *inputXmlPath = @"c:/someDir/e-Invoice.xml";
NSString *outputP7mPath = @"c:/someDir/signed.p7m";

// Create the CAdES-BES attached signature, which contains the original data.
success = [crypt CreateP7M: inputXmlPath p7mPath: outputP7mPath];
if (success == NO) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

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