(Lianja) Create AuthNRequest with embedded signature (HTTP-POST binding)

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

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// 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

llSuccess = .T.
loXmlToSign = createobject("CkXml")
loXmlToSign.Tag = "samlp:AuthnRequest"
loXmlToSign.AddAttribute("xmlns:samlp","urn:oasis:names:tc:SAML:2.0:protocol")
loXmlToSign.AddAttribute("xmlns:saml","urn:oasis:names:tc:SAML:2.0:assertion")
loXmlToSign.AddAttribute("ID","pfx41d8ef22-e612-8c50-9960-1b16f15741b3")
loXmlToSign.AddAttribute("Version","2.0")
loXmlToSign.AddAttribute("ProviderName","SP test")
loXmlToSign.AddAttribute("IssueInstant","2014-07-16T23:52:45Z")
loXmlToSign.AddAttribute("Destination","http://idp.example.com/SSOService.php")
loXmlToSign.AddAttribute("ProtocolBinding","urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST")
loXmlToSign.AddAttribute("AssertionConsumerServiceURL","http://sp.example.com/demo1/index.php?acs")
loXmlToSign.UpdateChildContent("saml:Issuer","http://sp.example.com/demo1/metadata.php")
loXmlToSign.UpdateAttrAt("samlp:NameIDPolicy",.T.,"Format","urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress")
loXmlToSign.UpdateAttrAt("samlp:NameIDPolicy",.T.,"AllowCreate","true")
loXmlToSign.UpdateAttrAt("samlp:RequestedAuthnContext",.T.,"Comparison","exact")
loXmlToSign.UpdateChildContent("samlp:RequestedAuthnContext|saml:AuthnContextClassRef","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

loGen = createobject("CkXmlDSigGen")

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

// -------- Reference 1 --------
loGen.AddSameDocRef("pfx41d8ef22-e612-8c50-9960-1b16f15741b3","sha1","EXCL_C14N","","")

// Provide a certificate + private key. (PFX password is test123)
loCert = createobject("CkCert")
llSuccess = loCert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
if (llSuccess <> .T.) then
    ? loCert.LastErrorText
    release loXmlToSign
    release loGen
    release loCert
    return
endif

loGen.SetX509Cert(loCert,.T.)

loGen.KeyInfoType = "X509Data"
loGen.X509Type = "Certificate"

// Load XML to be signed...
loSbXml = createobject("CkStringBuilder")
loXmlToSign.GetXmlSb(loSbXml)

loGen.Behaviors = "IndentedSignature,ForceAddEnvelopedSignatureTransform"

// Sign the XML...
llSuccess = loGen.CreateXmlDSigSb(loSbXml)
if (llSuccess <> .T.) then
    ? loGen.LastErrorText
    release loXmlToSign
    release loGen
    release loCert
    release loSbXml
    return
endif

// Save the signed XMl to a file.
llSuccess = loSbXml.WriteFile("qa_output/signedXml.xml","utf-8",.F.)

// A sample of the signed XML is shown below..
? loSbXml.GetAsString()

// ----------------------------------------
// Verify the signature we just produced...
loVerifier = createobject("CkXmlDSig")
llSuccess = loVerifier.LoadSignatureSb(loSbXml)
if (llSuccess <> .T.) then
    ? loVerifier.LastErrorText
    release loXmlToSign
    release loGen
    release loCert
    release loSbXml
    release loVerifier
    return
endif

llVerified = loVerifier.VerifySignature(.T.)
if (llVerified <> .T.) then
    ? loVerifier.LastErrorText
    release loXmlToSign
    release loGen
    release loCert
    release loSbXml
    release loVerifier
    return
endif

? "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>
// 


release loXmlToSign
release loGen
release loCert
release loSbXml
release loVerifier