(Ruby) Duplicate OpensSSL Command that Decrypts Binary DER

This example duplicates the following:

openssl smime -decrypt -in INPUT_FILE -inform der -binary -out OUTPUT_FILE -recip PEM_CERT_AND_KEY -passin pass:PRIVKEY_PASSWORD

Note: Although "smime" is the OpenSSL command, we're not really dealing with S/MIME. The arguments "-inform der -binary" indicate that the input is simply the binary DER (i.e. the PKCS7 binary encrypted object). The output can be any type of file (whatever was encrypted).

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()

crypt.put_CryptAlgorithm("pki")

pem = Chilkat::CkPem.new()
success = pem.LoadPemFile("qa_data/pem/myPem.pem","password")
if (success != true)
    print pem.lastErrorText() + "\n";
    exit
end

# privkey is a CkPrivateKey
privkey = pem.GetPrivateKey(0)
if (pem.get_LastMethodSuccess() != true)
    print pem.lastErrorText() + "\n";
    exit
end

# cert is a CkCert
cert = pem.GetCert(0)
if (pem.get_LastMethodSuccess() != true)

    print pem.lastErrorText() + "\n";
    exit
end

success = crypt.SetDecryptCert2(cert,privkey)
if (success != true)

    print crypt.lastErrorText() + "\n";
    exit
end

success = crypt.CkDecryptFile("qa_data/infile.enc","qa_output/outfile.dat")
if (success != true)
    print crypt.lastErrorText() + "\n";
    exit
end

print "Success." + "\n";