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Classic ASP Examples

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(Classic ASP) Extract PKCS7 Signature Digest

Demonstrates how to extract a signature digest from a PKCS7 signature.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
'  This example requires the Chilkat Crypt API to have been previously unlocked.
'  See Unlock Chilkat Crypt for sample code.

set crypt = Server.CreateObject("Chilkat_9_5_0.Crypt2")

p7mFile = "qa_data/p7m/test.pdf.p7m"
outPath = "qa_output/test.pdf"

'  First let's see if this .p7m signature can be verified, and the original file extracted.
verified = crypt.VerifyP7M(p7mFile,outPath)
If (verified <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( crypt.LastErrorText) & "</pre>"
    Response.End
End If

'  How many signers?
'  (The NumSignerCerts property is set whenever a signature is verified.)
Response.Write "<pre>" & Server.HTMLEncode( "Num Signers: " & crypt.NumSignerCerts) & "</pre>"

'  Load the .p7m into memory...
set pkcs7Data = Server.CreateObject("Chilkat_9_5_0.BinData")
success = pkcs7Data.LoadFile(p7mFile)

'  Check to see if this .p7m contains the binary bytes, or if it's
'  already base64 encoded.  Get the 1st two bytes.  If the first two
'  bytes are the us-ascii values "MI", then we have base64.
set sbBase64 = Server.CreateObject("Chilkat_9_5_0.StringBuilder")
hexStr = pkcs7Data.GetEncodedChunk(0,2,"hex")
success = sbBase64.Append(hexStr)

bHaveBase64 = 0
If (sbBase64.ContentsEqual("4D49",1) = 1) Then
    bHaveBase64 = 1
    sbBase64.Clear 
    success = sbBase64.AppendBd(pkcs7Data,"utf-8",0,0)
End If

'  Get each signer's signature digest.
crypt.EncodingMode = "base64"
i = 0

Do While i < crypt.NumSignerCerts
    If (bHaveBase64) Then
        digest = crypt.Pkcs7ExtractDigest(i,sbBase64.GetAsString())
    Else
        digest = crypt.Pkcs7ExtractDigest(i,pkcs7Data.GetEncoded("base64"))
    End If

    If (crypt.LastMethodSuccess <> 1) Then
        Response.Write "<pre>" & Server.HTMLEncode( crypt.LastErrorText) & "</pre>"
        Response.End
    End If

    Response.Write "<pre>" & Server.HTMLEncode( "Signer " & i + 1 & " digest = " & digest) & "</pre>"
    i = i + 1
Loop

%>
</body>
</html>

 

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