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Duplicate openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

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Demonstrates how to duplicate this OpenSSL command:

openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

The in.dat file can contain text or binary data of any type. The OpenSSL command does the following:

1. Creates a SHA256 digest of the contents of the input file
2. Signs the SHA256 digest using the private 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.

$oPkey = ObjCreate("Chilkat.PrivateKey")

; Load the private key from an PEM file:
$bSuccess = $oPkey.LoadPemFile("private.pem")
If ($bSuccess = False) Then
    ConsoleWrite($oPkey.LastErrorText & @CRLF)
    Exit
EndIf

$oRsa = ObjCreate("Chilkat.Rsa")

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

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

; Load the file to be signed.
$oBdFileData = ObjCreate("Chilkat.BinData")
$bSuccess = $oBdFileData.LoadFile("in.dat")

$oBdSig = ObjCreate("Chilkat.BinData")
$bSuccess = $oRsa.SignBd($oBdFileData,"sha256",$oBdSig)
If ($bSuccess = False) Then
    ConsoleWrite($oRsa.LastErrorText & @CRLF)
    Exit
EndIf

; Save the binary signature to a file.
$bSuccess = $oBdSig.WriteFile("signature.sig")
If ($bSuccess <> True) Then
    ConsoleWrite("Failed to write signature.sig." & @CRLF)
    Exit
EndIf

ConsoleWrite("Success." & @CRLF)