VBScript

RSA Signature using Private Key from .snk File

See more RSA Examples

A .snk file (Strong Name Key file) is a file format used in the .NET ecosystem to store an RSA public/private key pair. This key pair is typically used for strong-naming assemblies, which is a process of signing .NET assemblies to ensure their integrity and to uniquely identify them.

This example loads a private key from a .snk file and creates an RSA signature.

VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

set rsa = CreateObject("Chilkat.Rsa")

' Load the .snk and return the private key as XML.
xmlStr = rsa.SnkToXml("./test.snk")
If (rsa.LastMethodSuccess = 0) Then
    outFile.WriteLine(rsa.LastErrorText)
    WScript.Quit
End If

set privKey = CreateObject("Chilkat.PrivateKey")
success = privKey.LoadXml(xmlStr)
If (success = 0) Then
    outFile.WriteLine(privKey.LastErrorText)
    WScript.Quit
End If

success = rsa.UsePrivateKey(privKey)
If (success = 0) Then
    outFile.WriteLine(rsa.LastErrorText)
    WScript.Quit
End If

' Sign the SHA-256 hash of the utf-8 byte representation of the contents of sb
' Return the signature in base64 format.
rsa.EncodingMode = "base64"
rsa.Charset = "utf-8"
sigBase64 = rsa.SignStringENC("This is the text to be hashed and signed.","sha256")
If (rsa.LastMethodSuccess = 0) Then
    outFile.WriteLine(rsa.LastErrorText)
    WScript.Quit
End If

outFile.WriteLine("RSA signature as base64: " & sigBase64)

outFile.Close