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Visual FoxPro Requires Chilkat v11.0.0+

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.

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LOCAL lnSuccess
LOCAL loMime
LOCAL loPart0
LOCAL loPart1
LOCAL loSbUnsignedMime
LOCAL loPfx
LOCAL loCert

lnSuccess = 0

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

loMime = CreateObject('Chilkat.Mime')

*  Create a MIME message to sign.
loMime.NewMultipartMixed()
loMime.AddHeaderField("someHeader1","Some value 1")
loMime.AddHeaderField("someHeader2","Some value 2")

loPart0 = CreateObject('Chilkat.Mime')
loPart0.AddHeaderField("hdrA","Some value A")
loPart0.AddHeaderField("hdrB","Some value B")
loPart0.ContentType = "text/plain"
loPart0.SetBody("This is the plain-text body.")

loPart1 = CreateObject('Chilkat.Mime')
loPart1.AddHeaderField("hdrX","Some value X")
loPart1.AddHeaderField("hdrY","Some value Y")
loPart1.ContentType = "text/xml"
loPart1.SetBody("<a>This is the XML body</a>")

loMime.AppendPart(loPart0)
loMime.AppendPart(loPart1)

*  The MIME to be signed:
loSbUnsignedMime = CreateObject('Chilkat.StringBuilder')
loMime.GetMimeSb(loSbUnsignedMime)
? loSbUnsignedMime.GetAsString()

*  	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.)
loPfx = CreateObject('Chilkat.Pfx')
lnSuccess = loPfx.LoadPfxFile("qa_data/rsassa-pss/privatekey.pfx","PFX_PASSWORD")
IF (lnSuccess = 0) THEN
    ? loPfx.LastErrorText
    RELEASE loMime
    RELEASE loPart0
    RELEASE loPart1
    RELEASE loSbUnsignedMime
    RELEASE loPfx
    CANCEL
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.)

loCert = CreateObject('Chilkat.Cert')
lnSuccess = loPfx.CertAt(0,loCert)
IF (lnSuccess = 0) THEN
    ? loPfx.LastErrorText
    RELEASE loMime
    RELEASE loPart0
    RELEASE loPart1
    RELEASE loSbUnsignedMime
    RELEASE loPfx
    RELEASE loCert
    CANCEL
ENDIF

*  Indicate that RSASSA-PSS with SHA256 should be used.
loMime.SigningAlg = "pss"
loMime.SigningHashAlg = "sha256"

*  Add a detached signature.
lnSuccess = loMime.AddDetachedSignature(loCert)
IF (lnSuccess <> 1) THEN
    ? loMime.LastErrorText
    RELEASE loMime
    RELEASE loPart0
    RELEASE loPart1
    RELEASE loSbUnsignedMime
    RELEASE loPfx
    RELEASE loCert
    CANCEL
ENDIF

*  Show the clear-signed MIME. (see the sample output below)
? "-------------------------------------------------------------"
? "Clear-signed MIME using detached signature:"
? "-------------------------------------------------------------"
? loMime.GetMime()

*  Restore the original unsigned MIME, and this time create an opaque signature.
loMime.LoadMime(loSbUnsignedMime.GetAsString())

*  Sign using an opaque signature
lnSuccess = loMime.ConvertToSigned(loCert)
IF (lnSuccess <> 1) THEN
    ? loMime.LastErrorText
    RELEASE loMime
    RELEASE loPart0
    RELEASE loPart1
    RELEASE loSbUnsignedMime
    RELEASE loPfx
    RELEASE loCert
    CANCEL
ENDIF

*  Show the opaque-signed MIME. (see the sample output below)
? "-------------------------------------------------------------"
? "Opaque-signed MIME :"
? "-------------------------------------------------------------"
? loMime.GetMime()
? "Success."

*  -----------------------------------------------
*  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
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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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*  	/QTfrLOuzXKy
*

RELEASE loMime
RELEASE loPart0
RELEASE loPart1
RELEASE loSbUnsignedMime
RELEASE loPfx
RELEASE loCert