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

Demonstrates how to load a private key from a PEM file and create a PKCS1 RSA digital 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 assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

set pkey = Server.CreateObject("Chilkat_9_5_0.PrivateKey")

' Load the private key from an RSA PEM file:
success = pkey.LoadPemFile("pvkey2_rsa.pem")

' Get the private key in XML format:
pkeyXml = pkey.GetXml()

set rsa = Server.CreateObject("Chilkat_9_5_0.Rsa")

' Import the private key into the RSA component:
success = rsa.ImportPrivateKey(pkeyXml)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( rsa.LastErrorText) & "</pre>"
    Response.End
End If

' This example will sign a string, and receive the signature
' in a hex-encoded string.  Therefore, set the encoding mode
' to "hex":
rsa.EncodingMode = "hex"

' If some other non-Chilkat software is going to verify
' the signature, it is important to match the byte-ordering.
' The LittleEndian property may be set to 1
' for little-endian byte ordering, 
' or 0  for big-endian byte ordering.
' Microsoft apps typically use little-endian, while
' OpenSSL and other services (such as Amazon CloudFront)
' use big-endian.
rsa.LittleEndian = 0

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>"

%>
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</html>