VB.NET Requires Chilkat v11.0.0+
VB.NET
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 VB.NET Downloads
Dim success As Boolean = False
' This requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.
Dim mime As New Chilkat.Mime
' Create a MIME message to sign.
mime.NewMultipartMixed()
mime.AddHeaderField("someHeader1","Some value 1")
mime.AddHeaderField("someHeader2","Some value 2")
Dim part0 As New Chilkat.Mime
part0.AddHeaderField("hdrA","Some value A")
part0.AddHeaderField("hdrB","Some value B")
part0.ContentType = "text/plain"
part0.SetBody("This is the plain-text body.")
Dim part1 As New Chilkat.Mime
part1.AddHeaderField("hdrX","Some value X")
part1.AddHeaderField("hdrY","Some value Y")
part1.ContentType = "text/xml"
part1.SetBody("<a>This is the XML body</a>")
mime.AppendPart(part0)
mime.AppendPart(part1)
' The MIME to be signed:
Dim sbUnsignedMime As New Chilkat.StringBuilder
mime.GetMimeSb(sbUnsignedMime)
Debug.WriteLine(sbUnsignedMime.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.)
Dim pfx As New Chilkat.Pfx
success = pfx.LoadPfxFile("qa_data/rsassa-pss/privatekey.pfx","PFX_PASSWORD")
If (success = False) Then
Debug.WriteLine(pfx.LastErrorText)
Exit Sub
End If
' 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.)
Dim cert As New Chilkat.Cert
success = pfx.CertAt(0,cert)
If (success = False) Then
Debug.WriteLine(pfx.LastErrorText)
Exit Sub
End If
' Indicate that RSASSA-PSS with SHA256 should be used.
mime.SigningAlg = "pss"
mime.SigningHashAlg = "sha256"
' Add a detached signature.
success = mime.AddDetachedSignature(cert)
If (success <> True) Then
Debug.WriteLine(mime.LastErrorText)
Exit Sub
End If
' Show the clear-signed MIME. (see the sample output below)
Debug.WriteLine("-------------------------------------------------------------")
Debug.WriteLine("Clear-signed MIME using detached signature:")
Debug.WriteLine("-------------------------------------------------------------")
Debug.WriteLine(mime.GetMime())
' Restore the original unsigned MIME, and this time create an opaque signature.
mime.LoadMime(sbUnsignedMime.GetAsString())
' Sign using an opaque signature
success = mime.ConvertToSigned(cert)
If (success <> True) Then
Debug.WriteLine(mime.LastErrorText)
Exit Sub
End If
' Show the opaque-signed MIME. (see the sample output below)
Debug.WriteLine("-------------------------------------------------------------")
Debug.WriteLine("Opaque-signed MIME :")
Debug.WriteLine("-------------------------------------------------------------")
Debug.WriteLine(mime.GetMime())
Debug.WriteLine("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
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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
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'