AutoIt

CMS Sign Hash

Demonstrates how to use the SignHashENC method to sign a pre-computed hash. This method creates a CMS signature (PKCS7 detached signature).

This example requires Chilkat v9.5.0.90 or later.

AutoIt

Local $bSuccess = False

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

$oCrypt = ObjCreate("Chilkat.Crypt2")

; Create the hash to be signed...
$oCrypt.HashAlgorithm = "sha256"
$oCrypt.EncodingMode = "base64"
$oCrypt.Charset = "utf-8"
; Create the SHA256 hash of a string using the utf-8 byte representation.
; Return the hash as base64.
Local $sBase64Hash = $oCrypt.HashStringENC("This is the string to be hashed")

; Load a certificate for signing.
$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

$oCrypt.SetSigningCert($oCert)

; Sign the hash to create a base64 CMS signature (which does not contain the original data).
; We can get the signature in a single line of base64 by specifying "base64", or 
; we can get multi-line base64 by specifying "base64_mime".
$oCrypt.EncodingMode = "base64_mime"
Local $sBase64CmsSig = $oCrypt.SignHashENC($sBase64Hash,"sha256","base64")
If ($oCrypt.LastMethodSuccess = False) Then
    ConsoleWrite($oCrypt.LastErrorText & @CRLF)
    Exit
EndIf

; Note: In the above call to SignHashENC, the encoding of the returned CMS signature is specified by the EncodingMode property.
; However, the encoding of the passed-in hash is indicated by the 3rd argument.

ConsoleWrite("CMS Signature: " & $sBase64CmsSig & @CRLF)