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

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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.

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Local $bSuccess = False

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

$oPubKey = ObjCreate("Chilkat.PublicKey")

; Load the public key from an PEM file:
$bSuccess = $oPubKey.LoadFromFile("pubKey.pem")
If ($bSuccess = False) Then
    ConsoleWrite($oPubKey.LastErrorText & @CRLF)
    Exit
EndIf

; Load the data of the original file that was signed.
$oBdFileData = ObjCreate("Chilkat.BinData")
$bSuccess = $oBdFileData.LoadFile("in.dat")

; Load the signature.
$oBdSig = ObjCreate("Chilkat.BinData")
$bSuccess = $oBdSig.LoadFile("signature.sig")

$oRsa = ObjCreate("Chilkat.Rsa")

; Import the public key into the RSA component:
$bSuccess = $oRsa.UsePublicKey($oPubKey)
If ($bSuccess = False) Then
    ConsoleWrite($oRsa.LastErrorText & @CRLF)
    Exit
EndIf

; OpenSSL uses big-endian.
$oRsa.LittleEndian = False

$bSuccess = $oRsa.VerifyBd($oBdFileData,"sha256",$oBdSig)
If ($bSuccess <> True) Then
    ConsoleWrite($oRsa.LastErrorText & @CRLF)
    ConsoleWrite("The signature was invalid." & @CRLF)
    Exit
EndIf

ConsoleWrite("The signature was verified." & @CRLF)