(Ruby) RSA Signature with Certificate's Private Key from PFX

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Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature.

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.

# Create an instance of a certificate store object, load a PFX file,
# locate the certificate we need, and use it for signing.
# (a PFX file may contain more than one certificate.)
certStore = Chilkat::CkCertStore.new()

# The 1st argument is the filename, the 2nd arg is the 
# PFX file's password:
success = certStore.LoadPfxFile("chilkat.pfx","test")
if (success != true)
    print certStore.lastErrorText() + "\n";
    exit
end

# cert is a CkCert
cert = certStore.FindCertBySubject("Chilkat Software, Inc.")
if (certStore.get_LastMethodSuccess() == false)
    print certStore.lastErrorText() + "\n";
    exit
end

# pkey is a CkPrivateKey
pkey = cert.ExportPrivateKey()
if (cert.get_LastMethodSuccess() == false)
    print cert.lastErrorText() + "\n";

    exit
end

# Get the private key in XML format:
pkeyXml = pkey.getXml()

rsa = Chilkat::CkRsa.new()

# Import the private key into the RSA component:
success = rsa.ImportPrivateKey(pkeyXml)
if (success != true)
    print rsa.lastErrorText() + "\n";

    exit
end

# Encode the signature as a hex string
rsa.put_EncodingMode("hex")

strData = "This is the string to be signed."

# Sign the string using the sha-1 hash algorithm.
# Other valid choices are "sha-256", "md2" and "md5".
hexSig = rsa.signStringENC(strData,"sha-1")

print hexSig + "\n";

print "Success!" + "\n";