(Ruby) Sign a Byte Array to Create a Detached Signature in a Byte Array

Signs data contained in a byte array to produce a detached signature (also in a byte array). Also shows how to verify the 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.

cert = Chilkat::CkCert.new()
success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
if (success == false)
    print cert.lastErrorText() + "\n";
    exit
end

fac = Chilkat::CkFileAccess.new()

fileBytes = Chilkat::CkByteData.new()
success = fac.ReadEntireFile("qa_data/pdf/sample.pdf",fileBytes)
if (fac.get_LastMethodSuccess() != true)
    print fac.lastErrorText() + "\n";
    exit
end

crypt = Chilkat::CkCrypt2.new()

success = crypt.SetSigningCert(cert)

# We can sign any type of file.
# The result is a detached signature (a signature that does not contain the data being signed).

sigBytes = Chilkat::CkByteData.new()
success = crypt.SignBytes(fileBytes,sigBytes)
if (crypt.get_LastMethodSuccess() != true)
    print crypt.lastErrorText() + "\n";
    exit
end

success = fac.WriteEntireFile("qa_output/sample.pdf.p7s",sigBytes)
if (fac.get_LastMethodSuccess() != true)
    print fac.lastErrorText() + "\n";
    exit
end

# We can verify the detached signature like this
verified = crypt.VerifyBytes(fileBytes,sigBytes)
if (crypt.get_LastMethodSuccess() != true)
    print crypt.lastErrorText() + "\n";
    exit
end

print "Verified = " + verified.to_s() + "\n";