(Objective-C) Verify XAdES with External File Reference

Demonstrates how to validate an XML digital signature that contains a reference to an external file. (This is one way of doing it..)

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#import <CkoStringBuilder.h>
#import <CkoXmlDSig.h>

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

// Load the XAdES file to be validated..
CkoStringBuilder *sbXml = [[CkoStringBuilder alloc] init];
BOOL success = [sbXml LoadFile: @"qa_data/xml_dsig_valid_samples/externalFile/test.pdf.XAdES" charset: @"utf-8"];
if (success == NO) {
    NSLog(@"%@",@"Failed to load XAdES input file.");
    return;
}

CkoXmlDSig *validator = [[CkoXmlDSig alloc] init];

// Specify a set of absolute or relative directory paths to be searched for any external file references.
// Directory paths are separated by semicolon chars.
validator.ExternalRefDirs = @"qa_data/externalFiles;qa_data/xml_dsig_valid_samples/externalFile;c:/someOtherDir";

success = [validator LoadSignatureSb: sbXml];
if (success == NO) {
    NSLog(@"%@",validator.LastErrorText);
    return;
}

// Validate signatures as usual..
int i = 0;
while (i < [validator.NumSignatures intValue]) {
    validator.Selector = [NSNumber numberWithInt: i];

    BOOL valid = [validator VerifySignature: YES];
    NSLog(@"%@%d%@%d",@"Signature ",i + 1,@" and all reference digests OK = ",valid);

    i = i + 1;
}