Lianja Requires Chilkat v11.0.0+
Lianja
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 Lianja Downloads
llSuccess = .F.
// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
loMime = createobject("CkMime")
// Create a MIME message to sign.
loMime.NewMultipartMixed()
loMime.AddHeaderField("someHeader1","Some value 1")
loMime.AddHeaderField("someHeader2","Some value 2")
loPart0 = createobject("CkMime")
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("CkMime")
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("CkStringBuilder")
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("CkPfx")
llSuccess = loPfx.LoadPfxFile("qa_data/rsassa-pss/privatekey.pfx","PFX_PASSWORD")
if (llSuccess = .F.) then
? loPfx.LastErrorText
release loMime
release loPart0
release loPart1
release loSbUnsignedMime
release loPfx
return
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("CkCert")
llSuccess = loPfx.CertAt(0,loCert)
if (llSuccess = .F.) then
? loPfx.LastErrorText
release loMime
release loPart0
release loPart1
release loSbUnsignedMime
release loPfx
release loCert
return
endif
// Indicate that RSASSA-PSS with SHA256 should be used.
loMime.SigningAlg = "pss"
loMime.SigningHashAlg = "sha256"
// Add a detached signature.
llSuccess = loMime.AddDetachedSignature(loCert)
if (llSuccess <> .T.) then
? loMime.LastErrorText
release loMime
release loPart0
release loPart1
release loSbUnsignedMime
release loPfx
release loCert
return
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
llSuccess = loMime.ConvertToSigned(loCert)
if (llSuccess <> .T.) then
? loMime.LastErrorText
release loMime
release loPart0
release loPart1
release loSbUnsignedMime
release loPfx
release loCert
return
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
// ggL4MIIC9DCCAl2gAwIBAgIJAMPsJCT11cniMA0GCSqGSIb3DQEBCwUAMIGSMQswCQYDVQQGEwJB
// VTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEhMB8GA1UECgwYSW50ZXJu
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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
// LS0tLS0wMDA2MDcwNzA3MDcwMTA1MDAwMTA5MDciDQpzb21lSGVhZGVyMTogU29tZSB2YWx1ZSAx
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// MDEwNTAwMDEwOTA3DQpoZHJBOiBTb21lIHZhbHVlIEENCmhkckI6IFNvbWUgdmFsdWUgQg0KQ29u
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//
release loMime
release loPart0
release loPart1
release loSbUnsignedMime
release loPfx
release loCert