(Ruby) Write PKCS1 or PKCS8 Public Key PEM

Demonstrates how to write either PKCS1 or PKCS8 format PEM files. PKCS1 public keys have this PEM format:

-----BEGIN RSA PUBLIC KEY-----
BASE64 ENCODED DATA
-----END RSA PUBLIC KEY-----

-----BEGIN PUBLIC KEY-----
BASE64 ENCODED DATA
-----END PUBLIC KEY-----

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

require 'chilkat'

# Unlock the Chilkat API.
# Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
# by calling UnlockBundle.  It requires a Bundle unlock code.
chilkatGlob = Chilkat::CkGlobal.new()
success = chilkatGlob.UnlockBundle("Anything for 30-day trial.")
if (success != true)
    print chilkatGlob.lastErrorText() + "\n";
    exit
end

pem = Chilkat::CkPem.new()

# Load a public key from a PEM file.
# (Assume the PEM contains at least one public key..)
success = pem.LoadPemFile("/Users/chilkat/testData/pem/myPublicKey.pem")
if (success != true)
    print pem.lastErrorText() + "\n";
    exit
end

numPublicKeys = pem.get_NumPublicKeys()
if (numPublicKeys == 0)
    print (("Error: Expected the PEM to contain public keys.")) + "\n";
    exit
end

# Get each public key as PEM, first in PKCS1 format, then in PKCS8.
for i in 1 .. numPublicKeys

    # First output to PKCS1 PEM format:
    print "This is PKCS1 format:" + "\n";
    pem.put_PublicKeyFormat("pkcs1")
    print pem.toPem() + "\n";

    # Now PKCS8 PEM format:
    print "This is PKCS8 format:" + "\n";
    pem.put_PublicKeyFormat("pkcs8")
    print pem.toPem() + "\n";

end