Ruby

Convert RSA Private Key to Public Key

See more RSA Examples

Demonstrates how to get a public RSA key from a private RSA key. Ruby

require 'chilkat'

success = false

privKey = Chilkat::CkPrivateKey.new()

# Step 1: Load the private key from a source.
# (Chilkat can load private keys from all types of formats, and from in-memory bytes or encoded strings.
# see the online reference documentation for more options.)
success = privKey.LoadPemFile("qa_data/pem/VP_Private.pem")
if (success == false)
    print privKey.lastErrorText() + "\n";
    exit
end

# Step 2: Get the public key object from the private key object.
pubKey = Chilkat::CkPublicKey.new()
privKey.ToPublicKey(pubKey)

# Step 3: Save the public key in a desired format. 
# (Chilkat can load or save public and private keys in many different formats.  See
# the online reference documentation for more options.)

# Saves to a PKCS8 PEM file.
bPreferPkcs1 = false
success = pubKey.SavePemFile(bPreferPkcs1,"qa_data/pem/VP_Public.pem")
if (pubKey.get_LastMethodSuccess() == false)
    print pubKey.lastErrorText() + "\n";
    exit
end

print "Extracted and saved public key from private key." + "\n";