Reading PKCS#12 credentials in jRuby using Java's java.security.KeyStore

gistfile1.rb

require 'java'
require 'highline/import'

keystore = Java::JavaSecurity::KeyStore.getInstance("PKCS12")

path = ask "Enter full path to the PKCS#12 file: "
fis = Java::JavaIo::FileInputStream.new(path)

password = ask("Enter you PKCS#12 password: ") { |q| q.echo = false }
password = Java::JavaLang::String.new(password).to_char_array

puts "Loading KeyStore ..."
keystore.load(fis, password)

puts "Looking for aliases ..."
keystore.aliases().each do |keystore_alias|
  puts "\tAlias: " + keystore_alias
end

puts "KeyStore type: " + keystore.type
puts "KeyStore provider: " + keystore.provider.inspect
puts "Number of entries in this KeyStore: " + keystore.size.to_s

puts "\n#################################################################\n"

puts "Printing the first certificate and key ..."
puts cert = keystore.getCertificate("1")
puts pk = keystore.getKey("1", password)

puts "\n#################################################################\n"

cert_base64 = "-----BEGIN CERTIFICATE-----\n"
cert_base64 << Java::JavaxXmlBind::DatatypeConverter.printBase64Binary(cert.getEncoded())
cert_base64 << "\n-----END CERTIFICATE-----"

pk_base64 = "-----BEGIN PRIVATE KEY-----\n"
pk_base64 << Java::JavaxXmlBind::DatatypeConverter.printBase64Binary(pk.getEncoded())
pk_base64 << "\n-----END PRIVATE KEY-----"

puts "Printing the first certificate and key in Base64 ..."
puts cert_base64
puts pk_base64

puts "\n#################################################################\n"

puts "PK encoded using: " + pk.getFormat()

cert.getEncoded() will output ASN.1 DER encoded byte array
pk.getEncoded() will output PKCS#8 encoded byte array

Notice: There is no RSA in "-----BEGIN PRIVATE KEY-----"!