(Chilkat2-Python) 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.

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS, Solaris

import sys
import chilkat2

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

mime = chilkat2.Mime()

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

part0 = chilkat2.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.")

part1 = chilkat2.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:
sbUnsignedMime = chilkat2.StringBuilder()
mime.GetMimeSb(sbUnsignedMime)
print(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.)
pfx = chilkat2.Pfx()
success = pfx.LoadPfxFile("qa_data/rsassa-pss/privatekey.pfx","PFX_PASSWORD")
if (success != True):
    print(pfx.LastErrorText)
    sys.exit()

# 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.)
# cert is a CkCert
cert = pfx.GetCert(0)
if (pfx.LastMethodSuccess != True):
    print(pfx.LastErrorText)
    sys.exit()

# 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):
    print(mime.LastErrorText)

    sys.exit()

# Show the clear-signed MIME. (see the sample output below)
print("-------------------------------------------------------------")
print("Clear-signed MIME using detached signature:")
print("-------------------------------------------------------------")
print(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):
    print(mime.LastErrorText)

    sys.exit()

# Show the opaque-signed MIME. (see the sample output below)
print("-------------------------------------------------------------")
print("Opaque-signed MIME :")
print("-------------------------------------------------------------")
print(mime.GetMime())

print("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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# 	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
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#