(Ruby) Duplicate openssl smime -decrypt -in some_file.dat.enc -binary -inform DER -inkey private.key -out some_file.dat

Demonstrates how to decrypt binary DER that was encrypted using the following openssl command:

openssl smime -encrypt -binary -aes-256-cbc -in some_file.dat -out some_file.dat.enc -outform DER cert.crt

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.

# Duplicates the following openssl command:
# openssl smime -decrypt -in hello.txt.enc -binary -inform DER -inkey private.key -out hello.txt

cert = Chilkat::CkCert.new()
success = cert.LoadFromFile("qa_data/openssl/EE.cer")
if (success == false)
    print cert.lastErrorText() + "\n";
    exit
end

bd = Chilkat::CkBinData.new()
success = bd.LoadFile("qa_data/openssl/EE.key")
# Assuming success..

privKey = Chilkat::CkPrivateKey.new()
success = privKey.LoadAnyFormat(bd,"")
if (success == false)
    print privKey.lastErrorText() + "\n";
    exit
end

crypt = Chilkat::CkCrypt2.new()
success = crypt.SetDecryptCert2(cert,privKey)
if (success == false)
    print crypt.lastErrorText() + "\n";
    exit
end

crypt.put_CryptAlgorithm("PKI")
success = crypt.CkDecryptFile("qa_data/openssl/hello.txt.enc","qa_output/hello.txt")
if (success == false)
    print crypt.lastErrorText() + "\n";
    exit
end

print "Success." + "\n";