(Classic ASP) Create PKCS1 RSA Signature with PEM Private Key

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Demonstrates how to load a private key from a PEM file and create a PKCS1 RSA digital signature.

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

' Load the private key from an RSA PEM file:
success = pkey.LoadPemFile("pvkey2_rsa.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 object:
success = rsa.UsePrivateKey(pkey)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( rsa.LastErrorText) & "</pre>"
    Response.End
End If

' Get the signature as hex.
rsa.EncodingMode = "hex"

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

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

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

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

%>
</body>
</html>