Tobase64 HTTP-Redirect binding

Question

Still struggling with encrypting a SAML request to be sent to an ADFS server.  Turns out there are multiple ways to encode strings.  By default the utf-8 encrption option with the toBase64 tag uses HTTP-Post binding.  I need it my script to use HTTP-REDIRECT binding. 
The code I'm using is this:
<CFSAVECONTENT VARIABLE = "samlAssertionXML">
<samlp:AuthnRequest IssueInstant="2014-09-16T19:24:18.343Z" ID="_kdls_testing_application_for_single_sign_on" Version="2.0" xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol">
<saml:Issuer xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">https://localhost/sde</saml:Issuer>
<samlp:NameIDPolicy AllowCreate="true"/>
</samlp:AuthnRequest>
</cfsavecontent>
<cfscript>
  samlAssertionXML = toBase64(toString(TRIM(samlAssertionXML)), "utf-8");
</cfscript>
When I take the string that gets returned by the toBase64 tag and use the SAML 2.0 Debugger the string gets de-crypted correctly.  But when I re-encrypt the string using HTTP-REDIRECT binding I get a different encryption string.  If I re-encrypt using the HTTP-POST binding I get the string I passed to the toBase64 tag.
So my question is how to I tell CF that I need to use HTTP-REDIRECT binding when I encrypt the string?

Answer 1

After a little searching around I found the following snippet of code that seems to do the trick.  It adds a ton of AAAAAAAAAAAAAA's to the encrypted string but the ADFS server isn't complaining and as I have a fast approaching deadline I'll live with them for now.  Still if you understand JAVA (I haven't developed in that language so I really don't) please clue me in to how this code does what it does.
<!--- perform Deflate, Base64 encode, and URL encode --->
<cfscript>
  saml_deflate = createObject("java", "java.util.zip.Deflater");
  saml_deflate.init(9,true);
  saml_deflate.setInput(samlAssertionXML.getBytes("UTF-8"));
  saml_deflate.finish();
  compressedDataLength = saml_deflate.deflate(output);
  data64 = toBase64(output,"UTF-8");
  data64url = urlencodedformat(data64);
</cfscript>