Sign a File to Create a .p7s File (Detached Signature)

Download Chilkat Crypt ActiveX

ASP example to create a detached signature file (.p7s) for any type file. The signature can be verified by calling VerifyP7S and passing the original filename and the .p7s filename.

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
set crypt = Server.CreateObject("Chilkat.Crypt2")

'  Any string argument automatically begins the 30-day trial.
success = crypt.UnlockComponent("30-day trial")
If (success <> 1) Then
    Response.Write Server.HtmlEncode("Crypt component unlock failed") & "<br>"

End If

'  Find our digital certificate from the Current User certificate store.
set ccs = Server.CreateObject("Chilkat.CreateCS")

Set certStore = ccs.OpenCurrentUserStore()

Set cert = certStore.FindCertBySubjectCN("Chilkat Software, Inc.")
If (cert Is Nothing ) Then
    Response.Write Server.HtmlEncode(cert.LastErrorText) & "<br>"

End If

'  Tell the crypt component to use this cert.
crypt.SetSigningCert cert

'  We can sign any type of file, creating a .p7s as output:
success = crypt.CreateP7S("license.rtf","license.p7s")
If (success = 0) Then
    Response.Write Server.HtmlEncode(crypt.LastErrorText) & "<br>"

End If

'  Verify the signature:
crypt.SetVerifyCert cert

success = crypt.VerifyP7S("license.rtf","license.p7s")
If (success = 0) Then
    Response.Write Server.HtmlEncode(crypt.LastErrorText) & "<br>"

End If

Response.Write Server.HtmlEncode("Success!") & "<br>"
%>
</body>
</html>