Objective-C

XML Inclusive Canonicalization

See more XML Digital Signatures Examples

Demonstrates how to convert XML to the Inclusive XML Canonicalization form as specified in http://www.w3.org/TR/xml-c14n/ Objective-C

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

BOOL success = NO;

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

// The XML digital signature verification class provides utility methods for
// XML canonicalization.  This example demonstrates how to do inclusive XML canonicalization.

CkoHttp *http = [[CkoHttp alloc] init];
CkoStringBuilder *sbXml = [[CkoStringBuilder alloc] init];
CkoXmlDSig *canon = [[CkoXmlDSig alloc] init];

// Use inclusive XML canonicalization.
NSString *canonVersion = @"C14N";
BOOL withComments = NO;

NSString *url = @"https://www.chilkatsoft.com/exampleData/c14n/test7.xml";
success = [http QuickGetSb: url sbContent: sbXml];

// This is the input XML:
// The XML comment is referring to when exclusive XML canonicalization is applied.  With inclusive canonicalization, the namespace nodes
// are kept, as we'll see below..

// <doc>
// <!-- A namespace node N is ignored if the nearest ancestor element of the node's parent element that is in the node-set has a namespace node in the node-set with the same local name and value as N. -->
// 	<animal xmlns:aa="https://www.animal.com/">
// 		<reptile xmlns:bb="https://www.reptile.com/">
//   			<lizard xmlns="" type="african fat tailed" abc="xyz" xmlns:aa="https://www.animal.com/" />
//   			<snake type="poisonous rattler" xmlns:bb="https://www.reptile.com/" >
//   			</snake>
//   		</reptile>
//   	</animal>
// </doc>

NSString *xmlInclCanon = [canon CanonicalizeXml: [sbXml GetAsString] version: canonVersion withComments: withComments];
NSLog(@"%@",xmlInclCanon);

// The C14N (inclusive) canonicalization is:

// <doc>
// 
// 	<animal xmlns:aa="https://www.animal.com/">
// 		<reptile xmlns:bb="https://www.reptile.com/">
//   			<lizard abc="xyz" type="african fat tailed"></lizard>
//   			<snake type="poisonous rattler">
//   			</snake>
//   		</reptile>
//   	</animal>
// </doc>

// To see the difference, let's do exclusive canonicalization..
canonVersion = @"EXCL_C14N";

NSString *xmlExclCanon = [canon CanonicalizeXml: [sbXml GetAsString] version: canonVersion withComments: withComments];
NSLog(@"%@",xmlExclCanon);

// // The C14N (exclusive) canonicalization is:
// 
// <doc>
// 
// 	<animal>
// 		<reptile>
//   			<lizard abc="xyz" type="african fat tailed"></lizard>
//   			<snake type="poisonous rattler">
//   			</snake>
//   		</reptile>
//   	</animal>
// </doc>