(VBScript) RSASSA-PSS Algorithm with SHA256 Hashing

RSA encrypt a SHA256 hash with OAEP padding.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

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

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.PrivateKey")
set privkey = CreateObject("Chilkat.PrivateKey")

' Load the private key object from a PEM file.
' (To load from a PEM string, call LoadPem instead.)
success = privkey.LoadPemFile("somePath/myPrivateKey.pem")
If (success <> 1) Then
    outFile.WriteLine(privkey.LastErrorText)
    WScript.Quit
End If

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Rsa")
set rsa = CreateObject("Chilkat.Rsa")
' Use RSA-PSS by setting OaepPadding = 1
rsa.OaepPadding = 1
' Use SHA256
rsa.OaepHash = "SHA-256"

success = rsa.ImportPrivateKeyObj(privkey)

' Generate a base64 signature.
rsa.EncodingMode = "base64"

sigStr = rsa.SignStringENC("String to be signed","SHA-256")
If (rsa.LastMethodSuccess <> 1) Then
    outFile.WriteLine(rsa.LastErrorText)
    WScript.Quit
End If

outFile.WriteLine("Signature: " & sigStr)

outFile.Close