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# frozen_string_literal: true
require "abstract_unit"
require "openssl"
require "active_support/time"
require "active_support/json"
class MessageEncryptorTest < ActiveSupport::TestCase
class JSONSerializer
def dump(value)
ActiveSupport::JSON.encode(value)
end
def load(value)
ActiveSupport::JSON.decode(value)
end
end
def setup
@secret = SecureRandom.random_bytes(32)
@verifier = ActiveSupport::MessageVerifier.new(@secret, serializer: ActiveSupport::MessageEncryptor::NullSerializer)
@encryptor = ActiveSupport::MessageEncryptor.new(@secret)
@data = { some: "data", now: Time.local(2010) }
end
def test_encrypting_twice_yields_differing_cipher_text
first_message = @encryptor.encrypt_and_sign(@data).split("--").first
second_message = @encryptor.encrypt_and_sign(@data).split("--").first
assert_not_equal first_message, second_message
end
def test_messing_with_either_encrypted_values_causes_failure
text, iv = @verifier.verify(@encryptor.encrypt_and_sign(@data)).split("--")
assert_not_decrypted([iv, text] * "--")
assert_not_decrypted([text, munge(iv)] * "--")
assert_not_decrypted([munge(text), iv] * "--")
assert_not_decrypted([munge(text), munge(iv)] * "--")
end
def test_messing_with_verified_values_causes_failures
text, iv = @encryptor.encrypt_and_sign(@data).split("--")
assert_not_verified([iv, text] * "--")
assert_not_verified([text, munge(iv)] * "--")
assert_not_verified([munge(text), iv] * "--")
assert_not_verified([munge(text), munge(iv)] * "--")
end
def test_signed_round_tripping
message = @encryptor.encrypt_and_sign(@data)
assert_equal @data, @encryptor.decrypt_and_verify(message)
end
def test_backwards_compat_for_64_bytes_key
# 64 bit key
secret = ["3942b1bf81e622559ed509e3ff274a780784fe9e75b065866bd270438c74da822219de3156473cc27df1fd590e4baf68c95eeb537b6e4d4c5a10f41635b5597e"].pack("H*")
# Encryptor with 32 bit key, 64 bit secret for verifier
encryptor = ActiveSupport::MessageEncryptor.new(secret[0..31], secret)
# Message generated with 64 bit key
message = "eHdGeExnZEwvMSt3U3dKaFl1WFo0TjVvYzA0eGpjbm5WSkt5MXlsNzhpZ0ZnbWhBWFlQZTRwaXE1bVJCS2oxMDZhYVp2dVN3V0lNZUlWQ3c2eVhQbnhnVjFmeVVubmhRKzF3WnZyWHVNMDg9LS1HSisyakJVSFlPb05ISzRMaXRzcFdBPT0=--831a1d54a3cda8a0658dc668a03dedcbce13b5ca"
assert_equal "data", encryptor.decrypt_and_verify(message)[:some]
end
def test_alternative_serialization_method
prev = ActiveSupport.use_standard_json_time_format
ActiveSupport.use_standard_json_time_format = true
encryptor = ActiveSupport::MessageEncryptor.new(SecureRandom.random_bytes(32), SecureRandom.random_bytes(128), serializer: JSONSerializer.new)
message = encryptor.encrypt_and_sign(:foo => 123, "bar" => Time.utc(2010))
exp = { "foo" => 123, "bar" => "2010-01-01T00:00:00.000Z" }
assert_equal exp, encryptor.decrypt_and_verify(message)
ensure
ActiveSupport.use_standard_json_time_format = prev
end
def test_message_obeys_strict_encoding
bad_encoding_characters = "\n!@#"
message, iv = @encryptor.encrypt_and_sign("This is a very \n\nhumble string" + bad_encoding_characters)
assert_not_decrypted("#{::Base64.encode64 message.to_s}--#{::Base64.encode64 iv.to_s}")
assert_not_verified("#{::Base64.encode64 message.to_s}--#{::Base64.encode64 iv.to_s}")
assert_not_decrypted([iv, message] * bad_encoding_characters)
assert_not_verified([iv, message] * bad_encoding_characters)
end
def test_aead_mode_encryption
encryptor = ActiveSupport::MessageEncryptor.new(@secret, cipher: "aes-256-gcm")
message = encryptor.encrypt_and_sign(@data)
assert_equal @data, encryptor.decrypt_and_verify(message)
end
def test_aead_mode_with_hmac_cbc_cipher_text
encryptor = ActiveSupport::MessageEncryptor.new(@secret, cipher: "aes-256-gcm")
assert_aead_not_decrypted(encryptor, "eHdGeExnZEwvMSt3U3dKaFl1WFo0TjVvYzA0eGpjbm5WSkt5MXlsNzhpZ0ZnbWhBWFlQZTRwaXE1bVJCS2oxMDZhYVp2dVN3V0lNZUlWQ3c2eVhQbnhnVjFmeVVubmhRKzF3WnZyWHVNMDg9LS1HSisyakJVSFlPb05ISzRMaXRzcFdBPT0=--831a1d54a3cda8a0658dc668a03dedcbce13b5ca")
end
def test_messing_with_aead_values_causes_failures
encryptor = ActiveSupport::MessageEncryptor.new(@secret, cipher: "aes-256-gcm")
text, iv, auth_tag = encryptor.encrypt_and_sign(@data).split("--")
assert_aead_not_decrypted(encryptor, [iv, text, auth_tag] * "--")
assert_aead_not_decrypted(encryptor, [munge(text), iv, auth_tag] * "--")
assert_aead_not_decrypted(encryptor, [text, munge(iv), auth_tag] * "--")
assert_aead_not_decrypted(encryptor, [text, iv, munge(auth_tag)] * "--")
assert_aead_not_decrypted(encryptor, [munge(text), munge(iv), munge(auth_tag)] * "--")
assert_aead_not_decrypted(encryptor, [text, iv] * "--")
assert_aead_not_decrypted(encryptor, [text, iv, auth_tag[0..-2]] * "--")
end
private
def assert_aead_not_decrypted(encryptor, value)
assert_raise(ActiveSupport::MessageEncryptor::InvalidMessage) do
encryptor.decrypt_and_verify(value)
end
end
def assert_not_decrypted(value)
assert_raise(ActiveSupport::MessageEncryptor::InvalidMessage) do
@encryptor.decrypt_and_verify(@verifier.generate(value))
end
end
def assert_not_verified(value)
assert_raise(ActiveSupport::MessageVerifier::InvalidSignature) do
@encryptor.decrypt_and_verify(value)
end
end
def munge(base64_string)
bits = ::Base64.strict_decode64(base64_string)
bits.reverse!
::Base64.strict_encode64(bits)
end
end
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