Licensing simple key generator using encrypted xml

Question

Hi ,

I need to implement a simple key generator which is possbily using encrypted xml i have tried out this example

http://www.codeproject.com/KB/security/xmldsiglic.aspx?fid=16744&df=90&mpp=25&noise=3&sort=Position&view=Quick&fr=201&select=606047

But this does not say much about how do i create a License key which i can use it in my application to authenticate .

All i want to is

1. Generate a License key which is encrypted
2. And my application parses this key generated !

Regards, Francis

Answer 1

The article you linked to includes a sample "sign.exe" application that you can use to generate a license file. It will convert this:

<license>
  <computerName>MYCOMPUTER</computerName>
  <expires>2003-09-31T00:00:00</expires>
</license>

Into this:

<license>
  <computerName>MYCOMPUTER</computerName>
  <expires>2003-09-31T00:00:00</expires>
  <Signature xmlns="http://www.w3.org/2000/09/xmldsig#"&gt;
    <SignedInfo>
      <CanonicalizationMethod
        Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" />
      <SignatureMethod
        Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
      <Reference URI="">
        <Transforms>
          <Transform
          Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
        </Transforms>
        <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
        <DigestValue>eU3Par59M28X1c1DNORnhmW0Z2Y=</DigestValue>
      </Reference>
    </SignedInfo>
    <SignatureValue>epyuHLJbmyscoVMg2pZZAtZJbBHsZFUCwE4Udv+u3TfiAms2HpLgN3cL
      NtRlxyQpvWt1FKAB/SCk1jr0IaeE7oEjCp2mDOOHhTUTyiv2vMJgCRecC1PLcrmR9ABhqk
      itsjzrCt7V3eF5SpObdUFqcj+n9gjuFnPQtlQeWcvKEcg=</SignatureValue>
  </Signature>
</license>