## In order to ensure backward compatibility we need to be able to
## read reference examples from previous versions of cyphr.
## Periodically we will create a new reference and ensure that it can
## be read in.  The most important part is the byte packing; there are
## 3 ways that we do that (sodium, openssl symmetric and openssl
## asymmetric), plus a little around how the data directory approach
## is structured.

## The data are generated by `make-reference.R` and stored in the
## reference directory under version number.

test_that("compatibility with 1.0.0", {
  skip_on_cran()
  path <- unzip_reference("reference/1.0.0.zip")
  path_cypher <- file.path(path, "cypher")

  cleartext <- readLines(file.path(path, "cleartext"))

  path_openssl_alice <- file.path(path, "openssl", "alice")
  path_openssl_bob <- file.path(path, "openssl", "bob")
  path_data <- file.path(path, "data")

  key_openssl_sym <- readRDS(file.path(path, "openssl", "sym.key"))

  key_sodium_sym <- read_binary(file.path(path, "sodium", "sym.key"))
  key_sodium_alice <- read_binary(file.path(path, "sodium", "alice.key"))
  pub_sodium_alice <- read_binary(file.path(path, "sodium", "alice.pub"))
  key_sodium_bob <- read_binary(file.path(path, "sodium", "bob.key"))
  pub_sodium_bob <- read_binary(file.path(path, "sodium", "bob.pub"))

  expect_identical(
    decrypt_string(file.path(path_cypher, "sodium_sym"),
                   key_sodium(key_sodium_sym)),
    cleartext)

  expect_identical(
    decrypt_string(file.path(path_cypher, "openssl_sym"),
                   key_openssl(key_openssl_sym)),
    cleartext)

  pair_bob <- keypair_sodium(pub_sodium_alice, key_sodium_bob)
  expect_identical(
    decrypt_string(file.path(path_cypher, "sodium_asym_alice"), pair_bob),
    cleartext)

  pair_bob <- keypair_openssl(path_openssl_alice, path_openssl_bob)
  expect_identical(
    decrypt_string(file.path(path_cypher, "openssl_asym_alice"), pair_bob),
    cleartext)

  expect_warning(
    data_key <- data_key(path_data, path_openssl_alice),
    "Your cyphr schema version is out of date")
  filename <- file.path(path_data, "secret.txt")

  expect_identical(decrypt(readLines(filename), data_key), cleartext)
})


test_that("compatibility with 1.1.0", {
  skip_on_cran()
  path <- unzip_reference("reference/1.1.0.zip")
  path_cypher <- file.path(path, "cypher")

  cleartext <- readLines(file.path(path, "cleartext"))

  path_openssl_alice <- file.path(path, "openssl", "alice")
  path_openssl_bob <- file.path(path, "openssl", "bob")
  path_data <- file.path(path, "data")

  key_openssl_sym <- readRDS(file.path(path, "openssl", "sym.key"))

  key_sodium_sym <- read_binary(file.path(path, "sodium", "sym.key"))
  key_sodium_alice <- read_binary(file.path(path, "sodium", "alice.key"))
  pub_sodium_alice <- read_binary(file.path(path, "sodium", "alice.pub"))
  key_sodium_bob <- read_binary(file.path(path, "sodium", "bob.key"))
  pub_sodium_bob <- read_binary(file.path(path, "sodium", "bob.pub"))

  expect_identical(
    decrypt_string(file.path(path_cypher, "sodium_sym"),
                   key_sodium(key_sodium_sym)),
    cleartext)

  expect_identical(
    decrypt_string(file.path(path_cypher, "openssl_sym"),
                   key_openssl(key_openssl_sym)),
    cleartext)

  pair_bob <- keypair_sodium(pub_sodium_alice, key_sodium_bob)
  expect_identical(
    decrypt_string(file.path(path_cypher, "sodium_asym_alice"), pair_bob),
    cleartext)

  pair_bob <- keypair_openssl(path_openssl_alice, path_openssl_bob)
  expect_identical(
    decrypt_string(file.path(path_cypher, "openssl_asym_alice"), pair_bob),
    cleartext)

  data_key <- data_key(path_data, path_openssl_alice)
  filename <- file.path(path_data, "secret.txt")

  expect_identical(decrypt(readLines(filename), data_key), cleartext)
})