Objective-C

Create a CAdES-T Signature

See more CAdES Examples

Demonstrates how to create a signature with an external timestamp that certifies the time of signing. This requires an online TSA (Time Stamping Authority) service that is capable of producing RFC 3161 compliant timestamps.

Note: This example requires Chilkat v9.5.0.78 or greater.

Objective-C

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

BOOL success = NO;

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

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

// This example will use a certificate + private key from a .pfx/.p12 file.
// On Windows systems, it is also possible to use certs on smartcards/usb tokens or certs pre-installed in the Windows registry.
CkoCert *cert = [[CkoCert alloc] init];

NSString *pfxPath = @"qa_data/pfx/myCertAndKey.p12";
NSString *pfxPassword = @"test123";

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

success = [crypt SetSigningCert: cert];

// Use SHA-256 rather than the default of SHA-1
crypt.HashAlgorithm = @"sha256";

// Create JSON that tells Chilkat what signing attributes to include:
CkoJsonObject *attrs = [[CkoJsonObject alloc] init];
[attrs UpdateBool: @"contentType" value: YES];
[attrs UpdateBool: @"signingTime" value: YES];
[attrs UpdateBool: @"messageDigest" value: YES];
[attrs UpdateBool: @"signingCertificateV2" value: YES];

// A CAdES-T signature is one that includes a timestampToken created by an online TSA (time stamping authority).
// We must include the TSA's URL, as well as a few options to indicate what is desired.
// Except for the TSA URL, the options shown here are typically what you would need.
[attrs UpdateBool: @"timestampToken.enabled" value: YES];
[attrs UpdateString: @"timestampToken.tsaUrl" value: @"https://freetsa.org/tsr"];
[attrs UpdateBool: @"timestampToken.addNonce" value: NO];
[attrs UpdateBool: @"timestampToken.requestTsaCert" value: YES];
[attrs UpdateString: @"timestampToken.hashAlg" value: @"sha256"];

crypt.SigningAttributes = [attrs Emit];

NSString *inFile = @"qa_data/json/sample.json";
NSString *outFile = @"qa_output/sample_cades_t.p7m";

// This creates the CAdES-T signature.  During the signature creation, it
// communicates with the TSA to get a timestampToken.
success = [crypt CreateP7M: inFile p7mPath: outFile];
if (success != YES) {
    NSLog(@"%@",crypt.LastErrorText);
    return;
}

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