Sign a File to Create a .p7m File (using a PFX)

ASP example to sign a file creating a .p7m file as output. The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

Download Chilkat Crypt ActiveX

<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 "<pre>" & Server.HTMLEncode( crypt.LastErrorText) & "</pre>"

End If

'  Use a digital certificate and private key from a PFX file (.pfx or .p12).
signingCertSubject = "Acme Inc"
pfxFilename = "/Users/chilkat/testData/pfx/acme.pfx"
pfxPassword = "test123"

set certStore = Server.CreateObject("Chilkat.CertStore")
success = certStore.LoadPfxFile(pfxFilename,pfxPassword)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( certStore.LastErrorText) & "</pre>"

End If

' cert is a Chilkat.Cert
Set cert = certStore.FindCertBySubjectCN(signingCertSubject)
If (cert Is Nothing ) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to find certificate by subject common name.") & "</pre>"

End If

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

'  We can sign any type of file, creating a .p7m as output:
inFile = "/Users/chilkat/testData/pdf/sample.pdf"
outFile = "/Users/chilkat/testData/p7m/sample.pdf.p7m"
success = crypt.CreateP7M(inFile,outFile)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( crypt.LastErrorText) & "</pre>"

End If

'  Verify and restore the original file:
crypt.SetVerifyCert cert

inFile = outFile
outFile = "/Users/chilkat/testData/pdf/restored.pdf"

success = crypt.VerifyP7M(inFile,outFile)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( crypt.LastErrorText) & "</pre>"

End If

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