(Ruby) Generate an RSA Key and Get as Base64 DER

Demonstrates how to generate a 2048-bit RSA key and return the public and private parts as unencrypted Base64 encoded DER.

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

require 'chilkat'

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

rsa = Chilkat::CkRsa.new()

# Generate a 2048-bit key.  Chilkat RSA supports
success = rsa.GenerateKey(2048)
if (success != true)
    print rsa.lastErrorText() + "\n";
    exit
end

# Get the public part of the key.
# pubKey is a CkPublicKey
pubKey = rsa.ExportPublicKeyObj()

# There are two possible formats for representing the RSA public key 
# in ASN.1 (DER).  The possible formats are PKCS1 and PKCS8.
# We can get either by setting bChoosePkcs1 to true or false.
bChoosePkcs1 = true
pubKeyBase64Der = pubKey.getEncoded(bChoosePkcs1,"base64")
print "Public Key Base64 DER:" + "\n";
print pubKeyBase64Der + "\n";

# Now get the private key as Base64 DER:
# Get the private part of the key.
# (Note: A public key is actually just a subset of the private key.  
#  If you have the private key, you also have the public key.
#  Thus Chilkat provides a method to get the public key from the private key.)
# privKey is a CkPrivateKey
privKey = rsa.ExportPrivateKeyObj()

# Again, we can get PKCS1 or PKCS8, but with different methods:
privKeyPkcs1 = privKey.getPkcs1ENC("base64")
print "Private Key PKCS1 Base64 DER:" + "\n";
print privKeyPkcs1 + "\n";

privKeyPkcs8 = privKey.getPkcs8ENC("base64")
print "Private Key PKCS8 Base64 DER:" + "\n";
print privKeyPkcs8 + "\n";