(Objective-C) FatturaPA XML Invoice Sign+Encrypt to P7M

Demonstrates how to create a CAdES BES signed + encrypted invoice.xml.p7m for the Italian FatturaPA exchange system.

Note: This example requires Chilkat v9.5.0.75 or greater.

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

// Note: Requires Chilkat v9.5.0.75 or greater.

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

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

// Use a digital certificate and private key from a PFX file (.pfx or .p12).
NSString *pfxPath = @"qa_data/pfx/cert_test123.pfx";
NSString *pfxPassword = @"test123";

CkoCert *cert = [[CkoCert alloc] init];
BOOL success = [cert LoadPfxFile: pfxPath password: pfxPassword];
if (success != YES) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

// Provide the signing cert (with associated private key).
success = [crypt SetSigningCert: cert];
if (success != YES) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

// Indicate that SHA-256 should be used.
crypt.HashAlgorithm = @"sha256";

// Specify the signed attributes to be included.
// (This is what makes it CAdES-BES compliant.)
CkoJsonObject *jsonSignedAttrs = [[CkoJsonObject alloc] init];
[jsonSignedAttrs UpdateInt: @"contentType" value: [NSNumber numberWithInt: 1]];
[jsonSignedAttrs UpdateInt: @"signingTime" value: [NSNumber numberWithInt: 1]];
[jsonSignedAttrs UpdateInt: @"messageDigest" value: [NSNumber numberWithInt: 1]];
[jsonSignedAttrs UpdateInt: @"signingCertificateV2" value: [NSNumber numberWithInt: 1]];
crypt.SigningAttributes = [jsonSignedAttrs Emit];

NSString *inFile = @"qa_data/xml/IT01234567890_11002.xml";
NSString *sigFile = @"qa_data/fatturapa/signed.p7m";

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

// Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
CkoCert *encryptCert = [[CkoCert alloc] init];
success = [encryptCert LoadFromFile: @"qa_data/certs/fatturapa_cert.pem"];
if (success != YES) {
    NSLog(@"%@",encryptCert.LastErrorText);
    return;
}

crypt.CryptAlgorithm = @"pki";

success = [crypt SetEncryptCert: encryptCert];
if (success != YES) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

// Indicate the underlying bulk encryption algorithm to be used:
crypt.Pkcs7CryptAlg = @"aes";
crypt.KeyLength = [NSNumber numberWithInt:128];

// There's one last option that could be set.  If is the RSA encryption encryption/padding scheme. 
// By default, RSAES_PKCS1-V1_5 is used.  If desired, the OaepPadding property could be set to YES to
// use RSAES_OAEP.  (We'll leave it set at the default value of NO)
crypt.OaepPadding = NO;

// Everything is specified.  Encrypt the .p7m to create a new .p7m (which adds a layer of encryption around the opaque signature).
// The output is PKCS7 in binary DER format.
success = [crypt CkEncryptFile: sigFile destFile: @"qa_output/signed_and_encrypted.p7m"];
if (success != YES) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

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