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(VBScript) RSA Sign with PKCS8 Encrypted Key

Demonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature (and then verify it).

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

set pkey = CreateObject("Chilkat_9_5_0.PrivateKey")

'  Load the private key from an RSA PEM file:
success = pkey.LoadPkcs8EncryptedFile("raul_privateKey.key","a0123456789")

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

set rsa = CreateObject("Chilkat_9_5_0.Rsa")

'  Any string argument automatically begins the 30-day trial.
success = rsa.UnlockComponent("Anything for 30-day trial.")
If (success <> 1) Then
    outFile.WriteLine("RSA component unlock failed")
    WScript.Quit
End If

'  Import the private key into the RSA component:
success = rsa.ImportPrivateKey(pkeyXml)
If (success <> 1) Then
    outFile.WriteLine(rsa.LastErrorText)
    WScript.Quit
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"

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

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

outFile.WriteLine(hexSig)

'  Now verify with the public key.
'  This example shows how to use the public key from
'  a digital certificate (.cer file)
set cert = CreateObject("Chilkat_9_5_0.Cert")
success = cert.LoadFromFile("raul_publicKey.cer")
If (success <> 1) Then
    outFile.WriteLine(cert.LastErrorText)
    WScript.Quit
End If

' pubKey is a Chilkat_9_5_0.PublicKey
Set pubKey = cert.ExportPublicKey()

'  Get the private key in XML format:
pubKeyXml = pubKey.GetXml()

set rsa2 = CreateObject("Chilkat_9_5_0.Rsa")
success = rsa2.ImportPublicKey(pubKeyXml)
If (success <> 1) Then
    outFile.WriteLine(rsa2.LastErrorText)
    WScript.Quit
End If

'  Verify the signature against the original data:
rsa2.EncodingMode = "hex"
success = rsa2.VerifyStringENC(strData,"sha-1",hexSig)
If (success <> 1) Then
    outFile.WriteLine(rsa2.LastErrorText)
    WScript.Quit
End If

outFile.WriteLine("Signature verified!")

'  Verify with incorrect data:
success = rsa2.VerifyStringENC("something else","sha-1",hexSig)
If (success <> 1) Then
    outFile.WriteLine("Signature not verified! (which was expected in this case)")
Else
    outFile.WriteLine("Hmmm... that's not right...")
End If


outFile.Close

 

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