(Ruby) Duplicate OpensSSL to Create Signature using Cert and Key Files

This example duplicates the following:

openssl smime –sign -in something.xml -out something.der -signer mycert.crt -inkey cert.key -outform der –nodetach

Note: Although "smime" is the OpenSSL command, it's not actually producing S/MIME. The arguments "-outform der -binary" indicates that the output is binary DER (i.e. the PKCS7 binary signature). The input can be any type of file: XML, PDF, JPG, ... *anything*...

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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

crypt = Chilkat::CkCrypt2.new()

# Load the cert and private key from separate files.
cert = Chilkat::CkCert.new()
success = cert.LoadFromFile("myCert.crt")
if (success != true)
    print cert.lastErrorText() + "\n";
    exit
end

bd = Chilkat::CkBinData.new()
success = bd.LoadFile("cert.key")
privkey = Chilkat::CkPrivateKey.new()
# Load from any format private key.
# If the file does not need a password, the 2nd arg is ignored.
success = privkey.LoadAnyFormat(bd,"password_if_needed")
if (success != true)
    print privkey.lastErrorText() + "\n";
    exit
end

success = crypt.SetSigningCert2(cert,privkey)
if (success != true)
    print crypt.lastErrorText() + "\n";
    exit
end

# Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
success = crypt.CreateP7M("qa_data/infile.anything","qa_output/outfile.der")
if (success != true)
    print crypt.lastErrorText() + "\n";
    exit
end

print "Success." + "\n";