System::Security::Cryptography example

enc-a.rb

require 'System'
require 'pp'

dotnet_path = System::Runtime::InteropServices::RuntimeEnvironment.GetRuntimeDirectory()
system_security = dotnet_path + "\\" + "System.Security.dll"

require system_security

include System::Security::Cryptography

class MyCredentialStore
  def initialize(file, entropy = "Foo")
    @file = file
    @encoding = System::Text::ASCIIEncoding.new
    @entropy = @encoding.get_bytes(entropy)
  end

  def write(data)
    d_a = @encoding.get_bytes(data)
    e_a = ProtectedData.Protect(d_a, @entropy, DataProtectionScope.CurrentUser)

    fstream = System::IO::File.open(@file, System::IO::FileMode.open_or_create)
    swriter = System::IO::BinaryWriter.new(fstream)

    swriter.write(e_a)

    swriter.close()
    fstream.close()
  end

  def read()
    fstream = System::IO::File.open(@file, System::IO::FileMode.open)
    sreader = System::IO::BinaryReader.new(fstream)

    e_a = sreader.ReadBytes(fstream.length)
    d_a = ProtectedData.Unprotect(e_a, @entropy, DataProtectionScope.CurrentUser)

    sreader.close()
    fstream.close()
    @encoding.get_string(d_a)
  end
end

cs = MyCredentialStore.new("foo.dat")
cs.write("foo")
pp cs.read
app_data_dir = System::Environment.GetFolderPath(System::Environment::SpecialFolder.LocalApplicationData)
app_data_dir += "\\Foo"
pp app_data_dir