Chilkat Examples

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(VBScript) Duplicate openssl dgst -sha256 -verify pubKey.pem -signature signature.sig in.dat

Demonstrates how to duplicate this OpenSSL command:

openssl dgst -sha256 -verify pubKey.pem -signature signature.sig in.dat
The in.dat file contains the original data that was signed, and can contain text or binary data of any type. The above OpenSSL command does the following:
  1. Creates a SHA256 digest of the contents of the input file.
  2. Verifies the SHA256 digest using the public key.

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 pubKey = CreateObject("Chilkat_9_5_0.PublicKey")

'  Load the public key from an PEM file:
success = pubKey.LoadOpenSslPemFile("pubKey.pem")
If (success <> 1) Then
    outFile.WriteLine(pubKey.LastErrorText)
    WScript.Quit
End If

set fac = CreateObject("Chilkat_9_5_0.FileAccess")

'  Load the data of the original file that was signed.
inData = fac.ReadEntireFile("in.dat")

'  Load the signature.
sigData = fac.ReadEntireFile("signature.sig")

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.LastErrorText)
    WScript.Quit
End If

'  Import the public key into the RSA component:
success = rsa.ImportPublicKeyObj(pubKey)
If (success <> 1) Then
    outFile.WriteLine(rsa.LastErrorText)
    WScript.Quit
End If

'  OpenSSL uses big-endian.
rsa.LittleEndian = 0

success = rsa.VerifyBytes(inData,"sha256",sigData)
If (success <> 1) Then
    outFile.WriteLine(rsa.LastErrorText)
    outFile.WriteLine("The signature was invalid.")
    WScript.Quit
End If

outFile.WriteLine("The signature was verified.")

outFile.Close

 

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