(Objective-C) Create Signed SOAP XML for DIAN Colombia WCF Service

Demonstrates how to create a signed SOAP XML document for DIAN Colombia.

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#import <CkoXml.h>
#import <CkoXmlDSigGen.h>
#import <CkoCert.h>
#import <CkoStringBuilder.h>
#import <CkoBinData.h>
#import <CkoXmlDSig.h>

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

// This example will produce a signed SOAP XML message that looks like this:

// <?xml version="1.0" encoding="utf-8"?>
// <soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:wcf="http://wcf.dian.colombia">
//     <soap:Header xmlns:wsa="http://www.w3.org/2005/08/addressing">
//         <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">
//             <wsu:Timestamp wsu:Id="TS-F25839120CBA3ECDAD68754D0443A667636FDA68">
//                 <wsu:Created>2019-08-23T23:03:01Z</wsu:Created>
//                 <wsu:Expires>2019-08-24T15:43:01Z</wsu:Expires>
//             </wsu:Timestamp>
//             <wsse:BinarySecurityToken EncodingType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary" 
// 			ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3" 
// 			wsu:Id="ABCXYZ-9F0F7E15A59816E680B4735080A789DC1EED6C9C">MIIG8jCCBd ... zLjGQUB6lcz</wsse:BinarySecurityToken>
//             <ds:Signature Id="SIG-F25839120CBA3ECDAD68754D0443A667636FDA68" xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
//                 <ds:SignedInfo>
//                     <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#">
//                         <ec:InclusiveNamespaces PrefixList="wsa soap wcf" xmlns:ec="http://www.w3.org/2001/10/xml-exc-c14n#"/>
//                     </ds:CanonicalizationMethod>
//                     <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/>
//                     <ds:Reference URI="#ID-F25839120CBA3ECDAD68754D0443A667636FDA68">
//                         <ds:Transforms>
//                             <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#">
//                                 <ec:InclusiveNamespaces PrefixList="soap wcf" xmlns:ec="http://www.w3.org/2001/10/xml-exc-c14n#"/>
//                             </ds:Transform>
//                         </ds:Transforms>
//                         <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
//                         <ds:DigestValue>gSIKtjS/BKA2bgecXkM8lYVBDqlXcU3juNYT9a+bSnM=</ds:DigestValue>
//                     </ds:Reference>
//                 </ds:SignedInfo>
//                 <ds:SignatureValue>sL7rOdyfkEnKgJja0eWrv ... YqG0T0pflBsGW9zXkjQ9NvAw==</ds:SignatureValue>
//                 <ds:KeyInfo Id="KI-F25839120CBA3ECDAD68754D0443A667636FDA68">
//                     <wsse:SecurityTokenReference wsu:Id="STR-F25839120CBA3ECDAD68754D0443A667636FDA68">
//                         <wsse:Reference URI="#ABCXYZ-9F0F7E15A59816E680B4735080A789DC1EED6C9C" ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3"/>
//                     </wsse:SecurityTokenReference>
//                 </ds:KeyInfo>
//             </ds:Signature>
//         </wsse:Security>
//         <wsa:Action>http://wcf.dian.colombia/IWcfDianCustomerServices/GetStatus</wsa:Action>
//         <wsa:To wsu:Id="ID-F25839120CBA3ECDAD68754D0443A667636FDA68" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">https://vpfe-hab.dian.gov.co/WcfDianCustomerServices.svc</wsa:To>
//     </soap:Header>
//     <soap:Body>
//         <wcf:GetStatus>
//             <wcf:trackId>123456666</wcf:trackId>
//         </wcf:GetStatus>
//     </soap:Body>
// </soap:Envelope>

// Use this online tool to generate code from sample Signed XML: 
// Generate Code to Create Signed XML

BOOL success = YES;
// Create the XML to be signed...
CkoXml *xmlToSign = [[CkoXml alloc] init];
xmlToSign.Tag = @"soap:Envelope";
[xmlToSign AddAttribute: @"xmlns:soap" value: @"http://www.w3.org/2003/05/soap-envelope"];
[xmlToSign AddAttribute: @"xmlns:wcf" value: @"http://wcf.dian.colombia"];
[xmlToSign UpdateAttrAt: @"soap:Header" autoCreate: YES attrName: @"xmlns:wsa" attrValue: @"http://www.w3.org/2005/08/addressing"];
[xmlToSign UpdateAttrAt: @"soap:Header|wsse:Security" autoCreate: YES attrName: @"xmlns:wsse" attrValue: @"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"];
[xmlToSign UpdateAttrAt: @"soap:Header|wsse:Security" autoCreate: YES attrName: @"xmlns:wsu" attrValue: @"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"];
[xmlToSign UpdateAttrAt: @"soap:Header|wsse:Security|wsu:Timestamp" autoCreate: YES attrName: @"wsu:Id" attrValue: @"TS-F25839120CBA3ECDAD68754D0443A667636FDA68"];
[xmlToSign UpdateChildContent: @"soap:Header|wsse:Security|wsu:Timestamp|wsu:Created" value: @"2019-08-23T23:03:01Z"];
[xmlToSign UpdateChildContent: @"soap:Header|wsse:Security|wsu:Timestamp|wsu:Expires" value: @"2019-08-24T15:43:01Z"];
[xmlToSign UpdateAttrAt: @"soap:Header|wsse:Security|wsse:BinarySecurityToken" autoCreate: YES attrName: @"EncodingType" attrValue: @"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary"];
[xmlToSign UpdateAttrAt: @"soap:Header|wsse:Security|wsse:BinarySecurityToken" autoCreate: YES attrName: @"ValueType" attrValue: @"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3"];
[xmlToSign UpdateAttrAt: @"soap:Header|wsse:Security|wsse:BinarySecurityToken" autoCreate: YES attrName: @"wsu:Id" attrValue: @"ABCXYZ-9F0F7E15A59816E680B4735080A789DC1EED6C9C"];
[xmlToSign UpdateChildContent: @"soap:Header|wsse:Security|wsse:BinarySecurityToken" value: @"BinarySecurityToken_Base64Binary_Content"];
[xmlToSign UpdateChildContent: @"soap:Header|wsa:Action" value: @"http://wcf.dian.colombia/IWcfDianCustomerServices/GetStatus"];
[xmlToSign UpdateAttrAt: @"soap:Header|wsa:To" autoCreate: YES attrName: @"wsu:Id" attrValue: @"ID-F25839120CBA3ECDAD68754D0443A667636FDA68"];
[xmlToSign UpdateAttrAt: @"soap:Header|wsa:To" autoCreate: YES attrName: @"xmlns:wsu" attrValue: @"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"];
[xmlToSign UpdateChildContent: @"soap:Header|wsa:To" value: @"https://vpfe-hab.dian.gov.co/WcfDianCustomerServices.svc"];
[xmlToSign UpdateChildContent: @"soap:Body|wcf:GetStatus|wcf:trackId" value: @"123456666"];

CkoXmlDSigGen *gen = [[CkoXmlDSigGen alloc] init];

gen.SigLocation = @"soap:Envelope|soap:Header|wsse:Security";
gen.SigLocationMod = [NSNumber numberWithInt:0];
gen.SigId = @"SIG-F25839120CBA3ECDAD68754D0443A667636FDA68";
gen.SigNamespacePrefix = @"ds";
gen.SigNamespaceUri = @"http://www.w3.org/2000/09/xmldsig#";
gen.SignedInfoCanonAlg = @"EXCL_C14N";
gen.SignedInfoDigestMethod = @"sha256";

// Set the KeyInfoId before adding references..
gen.KeyInfoId = @"KI-F25839120CBA3ECDAD68754D0443A667636FDA68";

// -------- Reference 1 --------
[gen AddSameDocRef: @"ID-F25839120CBA3ECDAD68754D0443A667636FDA68" digestMethod: @"sha256" canonMethod: @"EXCL_C14N" prefixList: @"soap wcf" refType: @""];

// Provide a certificate + private key. (PFX password is test123)
CkoCert *cert = [[CkoCert alloc] init];
success = [cert LoadPfxFile: @"qa_data/pfx/cert_test123.pfx" password: @"test123"];
if (success != YES) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

[gen SetX509Cert: cert usePrivateKey: YES];

gen.KeyInfoType = @"Custom";

// Create the custom KeyInfo XML..
CkoXml *xmlCustomKeyInfo = [[CkoXml alloc] init];
xmlCustomKeyInfo.Tag = @"wsse:SecurityTokenReference";
[xmlCustomKeyInfo AddAttribute: @"wsu:Id" value: @"STR-F25839120CBA3ECDAD68754D0443A667636FDA68"];
[xmlCustomKeyInfo UpdateAttrAt: @"wsse:Reference" autoCreate: YES attrName: @"URI" attrValue: @"#ABCXYZ-9F0F7E15A59816E680B4735080A789DC1EED6C9C"];
[xmlCustomKeyInfo UpdateAttrAt: @"wsse:Reference" autoCreate: YES attrName: @"ValueType" attrValue: @"http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3"];

xmlCustomKeyInfo.EmitXmlDecl = NO;
gen.CustomKeyInfoXml = [xmlCustomKeyInfo GetXml];

// Load XML to be signed...
CkoStringBuilder *sbXml = [[CkoStringBuilder alloc] init];
[xmlToSign GetXmlSb: sbXml];

// Update BinarySecurityToken_Base64Binary_Content with the actual X509 of the signing cert.
CkoBinData *bdCert = [[CkoBinData alloc] init];
[cert ExportCertDerBd: bdCert];

int nReplaced = [[sbXml Replace: @"BinarySecurityToken_Base64Binary_Content" replacement: [bdCert GetEncoded: @"base64"]] intValue];

gen.Behaviors = @"IndentedSignature";

// Sign the XML...
success = [gen CreateXmlDSigSb: sbXml];
if (success != YES) {
    NSLog(@"%@",gen.LastErrorText);
    return;
}

// -----------------------------------------------

// Save the signed XML to a file.
success = [sbXml WriteFile: @"qa_output/signedXml.xml" charset: @"utf-8" emitBom: NO];

NSLog(@"%@",[sbXml GetAsString]);

// ----------------------------------------
// Verify the signatures we just produced...
CkoXmlDSig *verifier = [[CkoXmlDSig alloc] init];
success = [verifier LoadSignatureSb: sbXml];
if (success != YES) {
    NSLog(@"%@",verifier.LastErrorText);
    return;
}

int numSigs = [verifier.NumSignatures intValue];
int verifyIdx = 0;
while (verifyIdx < numSigs) {
    verifier.Selector = [NSNumber numberWithInt: verifyIdx];
    BOOL verified = [verifier VerifySignature: YES];
    if (verified != YES) {
        NSLog(@"%@",verifier.LastErrorText);
        return;
    }

    verifyIdx = verifyIdx + 1;
}

NSLog(@"%@",@"All signatures were successfully verified.");

// --------------------------------------------------------------------------------
// Also see Chilkat's Online WSDL Code Generator
// to generate code and SOAP Request and Response XML for each operation in a WSDL.
// --------------------------------------------------------------------------------