require_relative 'provider'

module GcryptoJce
  module SecureRandom
    def generate(opts = { })
      eng = opts[:type] || "SHA1PRNG"
      prov = GcryptoJce::Provider.handle_options(opts, nil)
      
      if prov.nil?
        sr = java.security.SecureRandom.getInstance(eng)
      else
        sr = java.security.SecureRandom.getInstance(eng, prov)
      end

      byteLen = opts[:byteLen]
      hexLen = opts[:hexLen]
      intLen = opts[:intLen]
      if not byteLen.nil? and byteLen.to_i > 0
        b = Java::byte[byteLen].new
        sr.nextBytes(b)
        b
      elsif not hexLen.nil? and hexLen.to_i > 0
        b = Java::byte[hexLen*2].new
        sr.nextBytes(b)
        String.from_java_bytes(org.bouncycastle.util.encoders.Hex.encode(b))
      elsif not intLen.nil? and intLen.to_i > 0
        sr.nextInt
      else
        b = Java::byte[32].new
        sr.nextBytes(b)
        b
      end
    end
    # end generate
  end
  # end SecureRandom

  class SecureRandomEngine
    extend SecureRandom
  end

end