Objective-C

A3 Certificate Sign PDF to pdf.p7s

See more CAdES Examples

Demonstrates how to use an A3/A4 certificate on a smartcard or hardware token to convert a PDF into a .p7s file that contains the PDF within a PKCS7 signature (the .p7s format). Objective-C

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

BOOL success = NO;

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

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

CkoCert *cert = [[CkoCert alloc] init];

//  If the smartcard or token requires a PIN, we can set it here to avoid the dialog...
cert.SmartCardPin = @"000000";

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

//  Tell the crypt component to use this cert.
success = [crypt SetSigningCert: cert];
if (success != YES) {
    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";

//  We can sign any type of file, creating a .p7s as output.
//  The .p7s contains the signature and also embeds the data of the file that is signed.
NSString *inFile = @"qa_data/pdf/sample.pdf";
NSString *p7sFile = @"qa_output/sample.pdf.p7s";

//  Create the CAdES-BES attached signature, which contains the original data.
//  Note: Chilkat's function naming is not accurate.  CreateP7M creates a PKCS7 signature where the signed file
//  is contained within the signature.  CreateP7S creates a detached PKCS7 signature where the signed file
//  is NOT contained within the signature.  We want the data to be contained in the signature, therefore
//  we call CreateP7M even though we are naming our output file .p7s.
success = [crypt CreateP7M: inFile p7mPath: p7sFile];
if (success == NO) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

//  Verify the .p7s file and extract the original file from the .p7s. 
NSString *extractedToFilePath = @"qa_output/sample.pdf";
success = [crypt VerifyP7M: p7sFile destPath: extractedToFilePath];
if (success == NO) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

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