Sign a File to Create a .p7m File (using a PFX)

Ruby example to sign a file creating a .p7m file as output. The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

Downloads for Windows/Linux and Install Instructions

require 'chilkat'

crypt = Chilkat::CkCrypt2.new()

#  Any string argument automatically begins the 30-day trial.
success = crypt.UnlockComponent("30-day trial")
if (success != true)
    print crypt.lastErrorText() + "\n";
    exit
end

#  Use a digital certificate and private key from a PFX file (.pfx or .p12).
signingCertSubject = "Acme Inc"
pfxFilename = "/Users/chilkat/testData/pfx/acme.pfx"
pfxPassword = "test123"

certStore = Chilkat::CkCertStore.new()
success = certStore.LoadPfxFile(pfxFilename,pfxPassword)
if (success != true)
    print certStore.lastErrorText() + "\n";
    exit
end

# cert is a CkCert
cert = certStore.FindCertBySubjectCN(signingCertSubject)
if (cert == nil )
    print "Failed to find certificate by subject common name." + "\n";
    exit
end

#  Tell the crypt component to use this cert.
crypt.SetSigningCert(cert)

#  We can sign any type of file, creating a .p7m as output:
inFile = "/Users/chilkat/testData/pdf/sample.pdf"
outFile = "/Users/chilkat/testData/p7m/sample.pdf.p7m"
success = crypt.CreateP7M(inFile,outFile)
if (success == false)
    print crypt.lastErrorText() + "\n";

    exit
end

#  Verify and restore the original file:
crypt.SetVerifyCert(cert)

inFile = outFile
outFile = "/Users/chilkat/testData/pdf/restored.pdf"

success = crypt.VerifyP7M(inFile,outFile)
if (success == false)
    print crypt.lastErrorText() + "\n";

    exit
end

print "Success!" + "\n"