(Ruby) RSA Encrypt Randomly Generated AES Key

Demonstrates how to RSA encrypt a randomly generated AES key.

Note: This example requires Chilkat v11.0.0 or greater.

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

require 'chilkat'

success = false

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

# First generate a 256-bit AES key (32 bytes).
prng = Chilkat::CkPrng.new()
bdAesKey = Chilkat::CkBinData.new()
success = prng.GenRandomBd(32,bdAesKey)

# Use a public key from a certificate for RSA encryption.
cert = Chilkat::CkCert.new()

success = cert.LoadFromFile("qa_data/pem/mf_public_rsa.pem")
if (success == false)
    print cert.lastErrorText() + "\n";
    exit
end

pubKey = Chilkat::CkPublicKey.new()
cert.GetPublicKey(pubKey)

rsa = Chilkat::CkRsa.new()
success = rsa.UsePublicKey(pubKey)
if (success == false)
    print rsa.lastErrorText() + "\n";
    exit
end

# RSA encrypt our 32-byte AES key.
# The contents of bdAesKey are replaced with result of the RSA encryption.
success = rsa.EncryptBd(bdAesKey,false)
if (success == false)
    print rsa.lastErrorText() + "\n";
    exit
end

# Return the result as a base64 string
encryptedAesKey = bdAesKey.getEncoded("base64")

print "encrypted AES key = " + encryptedAesKey + "\n";