MIME S/MIME Signing Algorithm Properties

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Demonstrates the properties that control S/MIME signing: SigningAlg (the RSA signature scheme, PKCS1-V1_5 or RSASSA-PSS), SigningHashAlg (the message-digest algorithm), Micalg and Protocol (the micalg and protocol parameters of a multipart/signed Content-Type), and UseXPkcs7 (whether historical x-pkcs7 media-type names are used). The properties are configured before creating a detached signature.

Local $bSuccess = False

$oMime = ObjCreate("Chilkat.Mime")
$bSuccess = $oMime.SetBodyFromPlainText("This message will be signed.")
If ($bSuccess = False) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

;  SigningAlg is the RSA signature scheme.  The default is PKCS1-V1_5; set RSASSA-PSS (or pss) for
;  RSASSA-PSS.
$oMime.SigningAlg = "PKCS1-V1_5"

;  SigningHashAlg is the message-digest algorithm.  The default is sha256.
$oMime.SigningHashAlg = "sha256"

;  Micalg and Protocol are the micalg and protocol parameters written into a multipart/signed
;  Content-Type header field.  They are normally set automatically, but can be controlled here.
$oMime.Micalg = "sha-256"
$oMime.Protocol = "application/pkcs7-signature"

;  UseXPkcs7 controls whether newly created S/MIME media types use the historical x-pkcs7 names.
$oMime.UseXPkcs7 = False

;  Load a signing certificate (with private key access) from a PFX.  The PFX password should come
;  from a secure source rather than being hard-coded.
Local $sPfxPassword = "myPfxPassword"
$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadPfxFile("qa_data/signer.pfx",$sPfxPassword)
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

;  Create the detached signature using the algorithms configured above.
$bSuccess = $oMime.AddDetachedSignature($oCert)
If ($bSuccess = False) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Signed with SigningAlg=" & $oMime.SigningAlg & " SigningHashAlg=" & $oMime.SigningHashAlg & @CRLF)