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Objective-C

Create AuthNRequest with embedded signature (HTTP-POST binding)

See more XML Digital Signatures Examples

Demonstrates how to create a SAML AuthNRequest with embedded signature (HTTP-POST binding).

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Objective-C 
#import <CkoXml.h>
#import <CkoXmlDSigGen.h>
#import <CkoCert.h>
#import <CkoStringBuilder.h>
#import <CkoXmlDSig.h>

BOOL success = NO;

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

//  This example will sign the following SAML AuthNRequest:

//  <samlp:AuthnRequest 
//       xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
//       xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
//       ID="pfx41d8ef22-e612-8c50-9960-1b16f15741b3"
//       Version="2.0" ProviderName="SP test" IssueInstant="2014-07-16T23:52:45Z"
//       Destination="http://idp.example.com/SSOService.php"
//       ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
//       AssertionConsumerServiceURL="http://sp.example.com/demo1/index.php?acs">
//    <saml:Issuer>http://sp.example.com/demo1/metadata.php</saml:Issuer>
//    <samlp:NameIDPolicy Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress" AllowCreate="true"/>
//    <samlp:RequestedAuthnContext Comparison="exact">
//      <saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml:AuthnContextClassRef>
//    </samlp:RequestedAuthnContext>
//  </samlp:AuthnRequest>

//  First we build the XML to be signed.
//  
//  Use this online tool to generate the code from sample XML: 
//  Generate Code to Create XML

success = YES;
CkoXml *xmlToSign = [[CkoXml alloc] init];
xmlToSign.Tag = @"samlp:AuthnRequest";
[xmlToSign AddAttribute: @"xmlns:samlp" value: @"urn:oasis:names:tc:SAML:2.0:protocol"];
[xmlToSign AddAttribute: @"xmlns:saml" value: @"urn:oasis:names:tc:SAML:2.0:assertion"];
[xmlToSign AddAttribute: @"ID" value: @"pfx41d8ef22-e612-8c50-9960-1b16f15741b3"];
[xmlToSign AddAttribute: @"Version" value: @"2.0"];
[xmlToSign AddAttribute: @"ProviderName" value: @"SP test"];
[xmlToSign AddAttribute: @"IssueInstant" value: @"2014-07-16T23:52:45Z"];
[xmlToSign AddAttribute: @"Destination" value: @"http://idp.example.com/SSOService.php"];
[xmlToSign AddAttribute: @"ProtocolBinding" value: @"urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"];
[xmlToSign AddAttribute: @"AssertionConsumerServiceURL" value: @"http://sp.example.com/demo1/index.php?acs"];
[xmlToSign UpdateChildContent: @"saml:Issuer" value: @"http://sp.example.com/demo1/metadata.php"];
[xmlToSign UpdateAttrAt: @"samlp:NameIDPolicy" autoCreate: YES attrName: @"Format" attrValue: @"urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"];
[xmlToSign UpdateAttrAt: @"samlp:NameIDPolicy" autoCreate: YES attrName: @"AllowCreate" attrValue: @"true"];
[xmlToSign UpdateAttrAt: @"samlp:RequestedAuthnContext" autoCreate: YES attrName: @"Comparison" attrValue: @"exact"];
[xmlToSign UpdateChildContent: @"samlp:RequestedAuthnContext|saml:AuthnContextClassRef" value: @"urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport"];

//  Also see the online tool to generate the code from sample already-signed XML: 
//  Generate XML Signature Creation Code from an Already-Signed XML Sample

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

gen.SigLocation = @"samlp:AuthnRequest";
gen.SigNamespacePrefix = @"ds";
gen.SigNamespaceUri = @"http://www.w3.org/2000/09/xmldsig#";
gen.SignedInfoCanonAlg = @"EXCL_C14N";
gen.SignedInfoDigestMethod = @"sha1";

//  -------- Reference 1 --------
[gen AddSameDocRef: @"pfx41d8ef22-e612-8c50-9960-1b16f15741b3" digestMethod: @"sha1" canonMethod: @"EXCL_C14N" prefixList: @"" 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 = @"X509Data";
gen.X509Type = @"Certificate";

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

gen.Behaviors = @"IndentedSignature,ForceAddEnvelopedSignatureTransform";

//  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];

//  A sample of the signed XML is shown below..
NSLog(@"%@",[sbXml GetAsString]);

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

BOOL verified = [verifier VerifySignature: YES];
if (verified != YES) {
    NSLog(@"%@",verifier.LastErrorText);
    return;
}

NSLog(@"%@",@"This signature was successfully verified.");

//  -----------------------------------------
//  Sample output of AuthNRequest signed XML:
//  (Line-breaks and some indenting added for readability..)

//  <?xml version="1.0" encoding="utf-8"?>
//  <samlp:AuthnRequest 
//    xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" 
//    xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" 
//    ID="pfx41d8ef22-e612-8c50-9960-1b16f15741b3" 
//    Version="2.0" ProviderName="SP test" 
//    IssueInstant="2014-07-16T23:52:45Z" 
//    Destination="http://idp.example.com/SSOService.php" 
//    ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" 
//    AssertionConsumerServiceURL="http://sp.example.com/demo1/index.php?acs">
//      <saml:Issuer>http://sp.example.com/demo1/metadata.php</saml:Issuer>
//      <samlp:NameIDPolicy Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress" AllowCreate="true"/>
//      <samlp:RequestedAuthnContext Comparison="exact">
//          <saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml:AuthnContextClassRef>
//      </samlp:RequestedAuthnContext>
//  	<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
//  	  <ds:SignedInfo>
//  	    <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
//  	    <ds:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
//  	    <ds:Reference URI="#pfx41d8ef22-e612-8c50-9960-1b16f15741b3">
//  	      <ds:Transforms>
//  	        <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
//  	        <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
//  	      </ds:Transforms>
//  	      <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
//  	      <ds:DigestValue>5d+/YNShy4qnvZcvik8fHHg2SWQ=</ds:DigestValue>
//  	    </ds:Reference>
//  	  </ds:SignedInfo>
//  	  <ds:SignatureValue>QS16H5...U5LQ==</ds:SignatureValue>
//  	  <ds:KeyInfo>
//  	    <ds:X509Data>
//  	      <ds:X509Certificate>MIIF...tjlF4=</ds:X509Certificate>
//  	    </ds:X509Data>
//  	  </ds:KeyInfo>
//  	</ds:Signature>
//  </samlp:AuthnRequest>
//