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Sign MIME using RSASSA-PSS with SHA256

See more MIME Examples

Demonstrates how to sign an MIME using the RSASSA-PSS signing algorithm with the SHA256 hash algorithm.

Chilkat AutoIt Downloads

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Local $bSuccess = False

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

$oMime = ObjCreate("Chilkat.Mime")

; Create a MIME message to sign.
$oMime.NewMultipartMixed()
$oMime.AddHeaderField("someHeader1","Some value 1")
$oMime.AddHeaderField("someHeader2","Some value 2")

$oPart0 = ObjCreate("Chilkat.Mime")
$oPart0.AddHeaderField("hdrA","Some value A")
$oPart0.AddHeaderField("hdrB","Some value B")
$oPart0.ContentType = "text/plain"
$oPart0.SetBody "This is the plain-text body."

$oPart1 = ObjCreate("Chilkat.Mime")
$oPart1.AddHeaderField("hdrX","Some value X")
$oPart1.AddHeaderField("hdrY","Some value Y")
$oPart1.ContentType = "text/xml"
$oPart1.SetBody "<a>This is the XML body</a>"

$oMime.AppendPart($oPart0)
$oMime.AppendPart($oPart1)

; The MIME to be signed:
$oSbUnsignedMime = ObjCreate("Chilkat.StringBuilder")
$oMime.GetMimeSb($oSbUnsignedMime)
ConsoleWrite($oSbUnsignedMime.GetAsString() & @CRLF)

; 	Content-Type: multipart/mixed; boundary="------------080303020600020604010008"
; 	someHeader1: Some value 1
; 	someHeader2: Some value 2
; 
; 	--------------080303020600020604010008
; 	hdrA: Some value A
; 	hdrB: Some value B
; 	Content-Type: text/plain
; 
; 	This is the plain-text body.
; 	--------------080303020600020604010008
; 	hdrX: Some value X
; 	hdrY: Some value Y
; 	Content-Type: text/xml
; 
; 	<a>This is the XML body</a>
; 	--------------080303020600020604010008--
; 

; Get a digital certificate with private key from a .pfx
; (Chilkat has many different ways to provide a cert + private key for siging.
; Using a PFX is just one possible option.)
$oPfx = ObjCreate("Chilkat.Pfx")
$bSuccess = $oPfx.LoadPfxFile("qa_data/rsassa-pss/privatekey.pfx","PFX_PASSWORD")
If ($bSuccess = False) Then
    ConsoleWrite($oPfx.LastErrorText & @CRLF)
    Exit
EndIf

; Get the certificate to be used for signing.
; (The typical case for a PFX is that it contains a cert with an associated private key,
; as well as other certificates in the chain of authentication.  The cert with the private
; key should be in the first position at index 0.)

$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oPfx.CertAt(0,$oCert)
If ($bSuccess = False) Then
    ConsoleWrite($oPfx.LastErrorText & @CRLF)
    Exit
EndIf

; Indicate that RSASSA-PSS with SHA256 should be used.
$oMime.SigningAlg = "pss"
$oMime.SigningHashAlg = "sha256"

; Add a detached signature.
$bSuccess = $oMime.AddDetachedSignature($oCert)
If ($bSuccess <> True) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

; Show the clear-signed MIME. (see the sample output below)
ConsoleWrite("-------------------------------------------------------------" & @CRLF)
ConsoleWrite("Clear-signed MIME using detached signature:" & @CRLF)
ConsoleWrite("-------------------------------------------------------------" & @CRLF)
ConsoleWrite($oMime.GetMime() & @CRLF)

; Restore the original unsigned MIME, and this time create an opaque signature.
$oMime.LoadMime($oSbUnsignedMime.GetAsString())

; Sign using an opaque signature
$bSuccess = $oMime.ConvertToSigned($oCert)
If ($bSuccess <> True) Then
    ConsoleWrite($oMime.LastErrorText & @CRLF)
    Exit
EndIf

; Show the opaque-signed MIME. (see the sample output below)
ConsoleWrite("-------------------------------------------------------------" & @CRLF)
ConsoleWrite("Opaque-signed MIME :" & @CRLF)
ConsoleWrite("-------------------------------------------------------------" & @CRLF)
ConsoleWrite($oMime.GetMime() & @CRLF)
ConsoleWrite("Success." & @CRLF)

; -----------------------------------------------
; This is sample output for the clear-signed MIME:
; -----------------------------------------------
; 
; 	Content-Type: multipart/signed; boundary="----=_NextPart_672_c95a_97b64c9a.90b5204d";
; 	 protocol="application/x-pkcs7-signature";
; 	 micalg=sha256
; 
; 	------=_NextPart_672_c95a_97b64c9a.90b5204d
; 	Content-Type: multipart/mixed; boundary="------------030207090102000301050504"
; 	someHeader1: Some value 1
; 	someHeader2: Some value 2
; 
; 	--------------030207090102000301050504
; 	hdrA: Some value A
; 	hdrB: Some value B
; 	Content-Type: text/plain
; 
; 	This is the plain-text body.
; 	--------------030207090102000301050504
; 	hdrX: Some value X
; 	hdrY: Some value Y
; 	Content-Type: text/xml
; 
; 	<a>This is the XML body</a>
; 	--------------030207090102000301050504--
; 
; 	------=_NextPart_672_c95a_97b64c9a.90b5204d
; 	Content-Transfer-Encoding: base64
; 	Content-Type: application/x-pkcs7-signature; name="smime.p7s"
; 	Content-Disposition: attachment; filename="smime.p7s"
; 
; 	MIIG5wYJKoZIhvcNAQcCoIIG2DCCBtQCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
; 	ggL4MIIC9DCCAl2gAwIBAgIJAMPsJCT11cniMA0GCSqGSIb3DQEBCwUAMIGSMQswCQYDVQQGEwJB
; 	VTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEhMB8GA1UECgwYSW50ZXJu
; 	ZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkqhkiG9w0BCQEWGWFkbWlu
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; 	neC8qw==
; 
; 	------=_NextPart_672_c95a_97b64c9a.90b5204d--
; 

; -----------------------------------------------
; This is sample output for the opaque-signed MIME:
; -----------------------------------------------
; 	Content-Type: application/x-pkcs7-mime; name="smime.p7m"; smime-type="signed-data"
; 	someHeader1: Some value 1
; 	someHeader2: Some value 2
; 	Content-Disposition: attachment; filename="smime.p7m"
; 	Content-Transfer-Encoding: base64
; 
; 	MIIItAYJKoZIhvcNAQcCoIIIpTCCCKECAQExDzANBglghkgBZQMEAgEFADCCAdYGCSqGSIb3DQEH
; 	AaCCAccEggHDQ29udGVudC1UeXBlOiBtdWx0aXBhcnQvbWl4ZWQ7IGJvdW5kYXJ5PSItLS0tLS0t
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; 	MDEwNTAwMDEwOTA3DQpoZHJBOiBTb21lIHZhbHVlIEENCmhkckI6IFNvbWUgdmFsdWUgQg0KQ29u
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;