Classic ASP

Duplicate openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

Demonstrates how to duplicate this OpenSSL command:

openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

The in.dat file can contain text or binary data of any type. The OpenSSL command does the following:

Creates a SHA256 digest of the contents of the input file
Signs the SHA256 digest using the private key.

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

set pkey = Server.CreateObject("Chilkat.PrivateKey")

' Load the private key from an PEM file:
success = pkey.LoadPemFile("private.pem")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( pkey.LastErrorText) & "</pre>"
    Response.End
End If

set rsa = Server.CreateObject("Chilkat.Rsa")

' Import the private key into the RSA component:
success = rsa.UsePrivateKey(pkey)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( rsa.LastErrorText) & "</pre>"
    Response.End
End If

' OpenSSL uses big-endian.
rsa.LittleEndian = 0

' Load the file to be signed.
set bdFileData = Server.CreateObject("Chilkat.BinData")
success = bdFileData.LoadFile("in.dat")

set bdSig = Server.CreateObject("Chilkat.BinData")
success = rsa.SignBd(bdFileData,"sha256",bdSig)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( rsa.LastErrorText) & "</pre>"
    Response.End
End If

' Save the binary signature to a file.
success = bdSig.WriteFile("signature.sig")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to write signature.sig.") & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "Success.") & "</pre>"

%>
</body>
</html>