Ruby Requires Chilkat v11.7.0+

Replace the Authenticode Signature of an Already Signed File

See more Code Signing Examples

Demonstrates how to sign a file that already has an Authenticode signature, for example to sign it with a renewed code signing certificate. Starting in Chilkat v11.7.0, AddSignature removes the existing signature and replaces it with the new one. Before v11.7.0, signing an already signed EXE or DLL added a second signature entry instead. Ruby

require 'chilkat'

success = false

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

#  Starting in Chilkat v11.7.0, AddSignature replaces the signature of a file that is already signed.
#  (Before v11.7.0, signing an already signed EXE or DLL added a second signature entry
#  instead of replacing the first.)
#  
#  This applies to every supported file type: EXE, DLL, MSI, PowerShell, and VBScript.

path = "C:/someDir/MyApp.exe"

codeSign = Chilkat::CkCodeSign.new()
sigInfo = Chilkat::CkJsonObject.new()
signerCert = Chilkat::CkCert.new()

#  Find out who signed the file.
valid = codeSign.VerifySignature(path,sigInfo)
if (valid == true)
    codeSign.GetSignerCert(signerCert)
    print "currently signed by: " + signerCert.subjectCN() + "\n";
    print "certificate valid until: " + signerCert.validToStr() + "\n";
else
    print "The file is not signed, or its signature is not valid." + "\n";
end

#  Load the certificate to sign with.  It must have access to its private key.
cert = Chilkat::CkCert.new()
success = cert.LoadPfxFile("C:/someDir/myNewCodeSigningCert.pfx","pfx password")
if (success == false)
    print cert.lastErrorText() + "\n";
    exit
end

#  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 = Chilkat::CkJsonObject.new()
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")

#  Sign the file.  It is not necessary to call RemoveSignature first:
#  the existing signature is removed and the new signature takes its place.
success = codeSign.AddSignature(path,cert,json)
if (success == false)
    print codeSign.lastErrorText() + "\n";
    exit
end

#  The file now has one signature, made with the new certificate.
valid = codeSign.VerifySignature(path,sigInfo)
if (valid == false)
    print codeSign.lastErrorText() + "\n";
    exit
end

success = codeSign.GetSignerCert(signerCert)
if (success == false)
    print codeSign.lastErrorText() + "\n";
    exit
end

print "now signed by: " + signerCert.subjectCN() + "\n";
print "certificate valid until: " + signerCert.validToStr() + "\n";