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Create a Hash Signature for Value Added Tax Audit SOAP Message for Angola

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Demonstrates how to create a hash signature that is required in Value Added Tax Audit Files in Angola, Africa.

It is the following two instructions that should be used to create a hash value to be put into a <hash></hash> field in SOAP XML file containing the tax data for the VAT authorities:

openssl dgst -shal -sign private.pem -outRegisto1.shal Registo1.txt

then

openssl enc -base64 - in Registo1.shal -out Registo1.b64 -A

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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.
; Provide the password in the 2nd argument.
; If no password is needed, just pass an empty string.
$bSuccess = $oPkey.LoadAnyFormatFile("qa_data/rsa/rsaPrivKey_secret.pem","secret")
If ($bSuccess = False) Then
    ConsoleWrite($oPkey.LastErrorText & @CRLF)
    Exit
EndIf

; Assuming this is an RSA private key..
$oRsa = ObjCreate("Chilkat.Rsa")

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

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

; SHA1 hash and sign, and return base64.
$oRsa.EncodingMode = "base64"
Local $sB64sig = $oRsa.SignStringENC("2018-05-18,2018-05-18T11:22:19;FAC 001/18;53.00;","sha1")
ConsoleWrite($sB64sig & @CRLF)

; The signature is equal in size to your private key.  For example, if you have a 1024-bit RSA key,
; then 1024 bits = 128 bytes.   When 128 bytes is base64 encoded, the result is a string approximately
; 4/3rds the size of the original.  128 * 4 / 3 = (approximately) 172 bytes.

; If your RSA key is 2048-bits, then your signature will be twice as long.