Generate a self-signed X509 certificate with ruby
Create a public X509 certificate called 'certificate.pem' and a private rsa key called 'private_key.pem':
require "openssl"
key = OpenSSL::PKey::RSA.new 4096
name = OpenSSL::X509::Name.parse '/CN=nobody'
cert = OpenSSL::X509::Certificate.new
cert.version = 2
cert.serial = 0
cert.not_before = Time.now
cert.not_after = Time.now + 606024364.251
cert.publickey = key.publickey
cert.subject = name
cert.issuer = name
cert.sign key, OpenSSL::Digest.new('SHA256')
open 'certificate.pem', 'w' do |io| io.write cert.to_pem end
open 'privatekey.pem', 'w' do |io| io.write key.topem end
The ruby openssl docs have other great examples.
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