Python Requires Chilkat v11.7.0+

Authenticode Sign a Windows Installer Package (MSI)

See more Code Signing Examples

Demonstrates how to Authenticode sign a Windows Installer package (.msi). Signing MSI packages requires Chilkat v11.7.0 or later. The package is signed in place, and the certificate must have an RSA key: Windows does not accept the signature of an MSI that was signed with an ECDSA certificate. Python

import sys
import chilkat2

success = False

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

# Signing a Windows Installer package (.msi) requires Chilkat v11.7.0 or later.

# Load the code signing certificate.  It must have access to its private key.
cert = chilkat2.Cert()
success = cert.LoadPfxFile("C:/someDir/myCodeSigningCert.pfx","pfx password")
if (success == False):
    print(cert.LastErrorText)
    sys.exit()

# Use a certificate with an RSA key to sign an MSI.
# Windows does not accept the signature of an MSI that was signed with an ECDSA certificate
# (signtool verify and the Digital Signatures tab of the file's properties report it as invalid).
# This is a limitation of signed MSI files on Windows.  It does not apply to EXE, DLL, PowerShell,
# or VBScript files, which can be signed with either kind of certificate.
if (cert.IsRsa() == False):
    print("Use an RSA code signing certificate to sign an MSI.")
    sys.exit()

# Sign with SHA256, and ask a timestamp authority for a timestamp.  A timestamp lets the
# signature continue to validate after the code signing certificate has expired.
# 
# {
#   "hashAlg": "sha256",
#   "timestampToken": {
#     "enabled": true,
#     "tsaUrl": "http://timestamp.digicert.com",
#     "requestTsaCert": true,
#     "hashAlg": "sha256"
#   }
# }
json = chilkat2.JsonObject()
json.UpdateString("hashAlg","sha256")
json.UpdateBool("timestampToken.enabled",True)
json.UpdateString("timestampToken.tsaUrl","http://timestamp.digicert.com")
json.UpdateBool("timestampToken.requestTsaCert",True)
json.UpdateString("timestampToken.hashAlg","sha256")

msiPath = "C:/someDir/MyAppSetup.msi"

signer = chilkat2.CodeSign()

# The .msi is modified in place.  The signature is stored in the package's digital signature stream.
# If the package is already signed, the new signature replaces the existing one.
success = signer.AddSignature(msiPath,cert,json)
if (success == False):
    print(signer.LastErrorText)
    sys.exit()

print("Signed the MSI.")

# Verify the signature that was just added.
sigInfo = chilkat2.JsonObject()
valid = signer.VerifySignature(msiPath,sigInfo)
if (valid == False):
    print(signer.LastErrorText)
    sys.exit()

print("The signature is valid.")