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module TFA
class SecureProxy
def initialize(original, passphrase)
@original = original
@digest = Digest::SHA256.digest(passphrase)
end
def encrypt!(algorithm = "AES-256-CBC")
cipher = OpenSSL::Cipher.new(algorithm)
cipher.encrypt
cipher.key = @digest
cipher.iv = iv = cipher.random_iv
plain_text = IO.read(@original.path)
json = JSON.generate(
algorithm: algorithm,
iv: Base64.encode64(iv),
cipher_text: Base64.encode64(cipher.update(plain_text) + cipher.final),
)
IO.write(@original.path, json)
end
def decrypt!
data = JSON.parse(IO.read(@original.path), symbolize_names: true)
decipher = OpenSSL::Cipher.new(data[:algorithm])
decipher.decrypt
decipher.key = @digest
decipher.iv = Base64.decode64(data[:iv])
IO.write(@original.path, decipher.update(Base64.decode64(data[:cipher_text])) + decipher.final)
end
private
def method_missing(name, *args, &block)
super unless @original.respond_to?(name)
was_encrypted = encrypted?
decrypt! if was_encrypted
result = @original.public_send(name, *args, &block)
encrypt! if was_encrypted
result
end
def encrypted?
return false unless File.exist?(@original.path)
JSON.parse(IO.read(@original.path))
true
rescue JSON::ParseError
false
end
end
end
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