(Objective-C) IKOF Generation Code for Montenegro Fiscalization Service

Demonstrates computing the IKOF MD5 summary value as described in section 4.3 of this document: https://poreskauprava.gov.me/ResourceManager/FileDownload.aspx?rId=416042&rType=2

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#import <NSString.h>
#import <CkoPfx.h>
#import <CkoPrivateKey.h>
#import <CkoRsa.h>
#import <CkoCrypt2.h>
#import <CkoBinData.h>

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

NSString *concatenatedParams = @"12345678|2019-06-12T17:05:43+02:00|9952|bb123bb1231|cc123cc1231|ss123ss123|199.01";

// Get the private key from a pfx file.
CkoPfx *pfx = [[CkoPfx alloc] init];
BOOL success = [pfx LoadPfxFile: @"qa_data/pfx/cert_test123.pfx" password: @"test123"];
if (success != YES) {
    NSLog(@"%@",pfx.LastErrorText);
    return;
}

CkoPrivateKey *privKey = [pfx GetPrivateKey: [NSNumber numberWithInt: 0]];
if (pfx.LastMethodSuccess == NO) {
    NSLog(@"%@",pfx.LastErrorText);
    return;
}

// Create IIC signature according to RSASSA-PKCS-v1_5 using SHA256
CkoRsa *rsa = [[CkoRsa alloc] init];
success = [rsa ImportPrivateKeyObj: privKey];
if (success == NO) {
    NSLog(@"%@",rsa.LastErrorText);
    return;
}

// PKCS-v1_5 is used by default.
rsa.EncodingMode = @"hex";
rsa.Charset = @"utf-8";
NSString *hexSig = [rsa SignStringENC: concatenatedParams hashAlg: @"sha256"];

NSLog(@"%@%@",@"Signature value result is: ",hexSig);

// Compute the MD5 hash of the bytes.
CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];
crypt.EncodingMode = @"hex";
crypt.HashAlgorithm = @"md5";
CkoBinData *bd = [[CkoBinData alloc] init];
[bd AppendEncoded: hexSig encoding: @"hex"];
NSString *md5_summary = [crypt HashBdENC: bd];

NSLog(@"%@%@",@"MD5 summary value is: ",md5_summary);