(Classic ASP) RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

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Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format.

Note: This example requires Chilkat v11.0.0 or greater.

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ActiveX for 32-bit and 64-bit Windows

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

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

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

' Load the .pfx/.p12
set pfx = Server.CreateObject("Chilkat.Pfx")
success = pfx.LoadPfxFile("qa_data/pfx/myKey.p12","myPassword")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( pfx.LastErrorText) & "</pre>"
    Response.End
End If

' Get the default private key.

set privKey = Server.CreateObject("Chilkat.PrivateKey")
success = pfx.PrivateKeyAt(0,privKey)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( pfx.LastErrorText) & "</pre>"
    Response.End
End If

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

' Get the signature in base64
rsa.EncodingMode = "base64"

strData = "This is the string to be signed."

' Sign the string using the sha256 hash algorithm.
' Other valid choices are "sha384", "sha512", "sha-1", "md2" and "md5".
base64Sig = rsa.SignStringENC(strData,"sha256")

Response.Write "<pre>" & Server.HTMLEncode( base64Sig) & "</pre>"

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

%>
</body>
</html>