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(Xojo Plugin) Sign MIME using RSASSA-PSS with SHA256

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

Note: This example requires Chilkat v9.5.0.67 or greater.

Chilkat Xojo Plugin Download

Xojo Plugin for Windows, Linux, Mac OS X, and ARM

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

Dim success As Boolean
Dim mime As New Chilkat.Mime

//  Create a MIME message to sign.
success = mime.NewMultipartMixed()
success = mime.AddHeaderField("someHeader1","Some value 1")
success = mime.AddHeaderField("someHeader2","Some value 2")

Dim part0 As New Chilkat.Mime
success = part0.AddHeaderField("hdrA","Some value A")
success = part0.AddHeaderField("hdrB","Some value B")
part0.ContentType = "text/plain"
part0.SetBody "This is the plain-text body."

Dim part1 As New Chilkat.Mime
success = part1.AddHeaderField("hdrX","Some value X")
success = part1.AddHeaderField("hdrY","Some value Y")
part1.ContentType = "text/xml"
part1.SetBody "<a>This is the XML body</a>"

success = mime.AppendPart(part0)
success = mime.AppendPart(part1)

//  The MIME to be signed:
Dim sbUnsignedMime As New Chilkat.StringBuilder
success = mime.GetMimeSb(sbUnsignedMime)
System.DebugLog(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 <> True) Then
    System.DebugLog(pfx.LastErrorText)
    Return
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 Chilkat.Cert
cert = pfx.GetCert(0)
If (pfx.LastMethodSuccess <> True) Then
    System.DebugLog(pfx.LastErrorText)
    Return
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
    System.DebugLog(mime.LastErrorText)

    Return
End If

//  Show the clear-signed MIME. (see the sample output below)
System.DebugLog("-------------------------------------------------------------")
System.DebugLog("Clear-signed MIME using detached signature:")
System.DebugLog("-------------------------------------------------------------")
System.DebugLog(mime.GetMime())

//  Restore the original unsigned MIME, and this time create an opaque signature.
success = mime.LoadMime(sbUnsignedMime.GetAsString())

//  Sign using an opaque signature
success = mime.ConvertToSigned(cert)
If (success <> True) Then
    System.DebugLog(mime.LastErrorText)

    Return
End If

//  Show the opaque-signed MIME. (see the sample output below)
System.DebugLog("-------------------------------------------------------------")
System.DebugLog("Opaque-signed MIME :")
System.DebugLog("-------------------------------------------------------------")
System.DebugLog(mime.GetMime())

System.DebugLog("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
//  	ZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkqhkiG9w0BCQEWGWFkbWlu
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//  	ULlhm1n7XIsZGy2W3lJ77v5agn9gFwXu1h3cqkGXkoteE6SQJQXWgsW3GWPveObvTL8LF4y57fgM
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//  	DwYDVQQIDAhWaWN0b3JpYTESMBAGA1UEBwwJTWVsYm91cm5lMSEwHwYDVQQKDBhJbnRlcm5ldCBX
//  	aWRnaXRzIFB0eSBMdGQxDzANBgNVBAMMBldpZGdldDEoMCYGCSqGSIb3DQEJARYZYWRtaW5AaW50
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//  	A1UEBhMCQVUxETAPBgNVBAgMCFZpY3RvcmlhMRIwEAYDVQQHDAlNZWxib3VybmUxITAfBgNVBAoM
//  	GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEPMA0GA1UEAwwGV2lkZ2V0MSgwJgYJKoZIhvcNAQkB
//  	FhlhZG1pbkBpbnRlcm5ldHdpZGdldHMuY29tAgkAw+wkJPXVyeIwPQYJKoZIhvcNAQEKMDCgDTAL
//  	BglghkgBZQMEAgGhGjAYBgkqhkiG9w0BAQgwCwYJYIZIAWUDBAIBogMCASAEgYAvqIqKBzNXyVbh
//  	TmaxdAc4d0ZTqWT6Na3C+DMO8owSKWy5FdGbJ2DLKm92qe/KLPTcj51vuwLUQb0Sw7r5Xknl+/6p
//  	Eqn2qe/6hgDn06vvzNofVAweOtSVJsBO7/cYYPc+pXZZ2BcpZDdf/9Ci56Yrlk7A72BeqPe47J3F
//  	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
//  	DQpzb21lSGVhZGVyMjogU29tZSB2YWx1ZSAyDQoNCi0tLS0tLS0tLS0tLS0tMDAwNjA3MDcwNzA3
//  	MDEwNTAwMDEwOTA3DQpoZHJBOiBTb21lIHZhbHVlIEENCmhkckI6IFNvbWUgdmFsdWUgQg0KQ29u
//  	dGVudC1UeXBlOiB0ZXh0L3BsYWluDQoNClRoaXMgaXMgdGhlIHBsYWluLXRleHQgYm9keS4NCi0t
//  	LS0tLS0tLS0tLS0tMDAwNjA3MDcwNzA3MDEwNTAwMDEwOTA3DQpoZHJYOiBTb21lIHZhbHVlIFgN
//  	Cmhkclk6IFNvbWUgdmFsdWUgWQ0KQ29udGVudC1UeXBlOiB0ZXh0L3htbA0KDQo8YT5UaGlzIGlz
//  	IHRoZSBYTUwgYm9keTwvYT4NCi0tLS0tLS0tLS0tLS0tMDAwNjA3MDcwNzA3MDEwNTAwMDEwOTA3
//  	LS0NCqCCAvgwggL0MIICXaADAgECAgkAw+wkJPXVyeIwDQYJKoZIhvcNAQELBQAwgZIxCzAJBgNV
//  	BAYTAkFVMREwDwYDVQQIDAhWaWN0b3JpYTESMBAGA1UEBwwJTWVsYm91cm5lMSEwHwYDVQQKDBhJ
//  	bnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxDzANBgNVBAMMBldpZGdldDEoMCYGCSqGSIb3DQEJARYZ
//  	YWRtaW5AaW50ZXJuZXR3aWRnZXRzLmNvbTAeFw0xNjExMDExNjUyMzJaFw0yMTEwMzExNjUyMzJa
//  	MIGSMQswCQYDVQQGEwJBVTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEh
//  	MB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkq
//  	hkiG9w0BCQEWGWFkbWluQGludGVybmV0d2lkZ2V0cy5jb20wgZ8wDQYJKoZIhvcNAQEBBQADgY0A
//  	MIGJAoGBAMYh2gKPJq+z4X9GbRUgHibo7tUvWP7UiqJ6hH00RfYZC+7ZUJ1x7LF/2prDVvGKkS+M
//  	vBSTDsx74FOUulZBsEwfzuzoqmwLwxXJeEwuk/Sgzw0WLH+8vPbB0uFSHsJm8kDSmWqQmT1uPntA
//  	i74Q7WS1QczYMVvqxyS8IvbLJsPXAgMBAAGjUDBOMB0GA1UdDgQWBBQ40oq7bOxciuKdbEgZPrni
//  	+txDCzAfBgNVHSMEGDAWgBQ40oq7bOxciuKdbEgZPrni+txDCzAMBgNVHRMEBTADAQH/MA0GCSqG
//  	SIb3DQEBCwUAA4GBACsW92Lm72LZAXVDD5x0LWXvDZjf6rpEiSWfZbytYkWN7TTrjijyFfLu/jqC
//  	IkJ52YVQuWGbWftcixkbLZbeUnvu/lqCf2AXBe7WHdyqQZeSi14TpJAlBdaCxbcZY+945u9MvwsX
//  	jLnt+Az1lZL5X0wlqN67jhF/+1TXtMtgqO8SMYIDszCCA68CAQEwgaAwgZIxCzAJBgNVBAYTAkFV
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//  	/QTfrLOuzXKy
// 

 

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