module Crypto::Box

Constants

BEFORENMBYTES
MACBYTES
NONCEBYTES
PRIMITIVE
PUBLICKEYBYTES
SECRETKEYBYTES
SEEDBYTES

Public Instance Methods

beforenm(public_key, secret_key) click to toggle source
# File lib/crypto/box.rb, line 91
def beforenm(public_key, secret_key)
  check_length(public_key, PUBLICKEYBYTES, :PublicKey)
  check_length(secret_key, SECRETKEYBYTES, :SecretKey)

  shared_secret = Sodium::SecretBuffer.new(BEFORENMBYTES)
  secret_key.readonly if secret_key.is_a?(Sodium::SecretBuffer)
  crypto_box_beforenm(shared_secret, public_key, secret_key)
  shared_secret.noaccess

  shared_secret
ensure
  secret_key.noaccess if secret_key.is_a?(Sodium::SecretBuffer)
end
box(message, nonce, public_key, secret_key) click to toggle source
# File lib/crypto/box.rb, line 105
def box(message, nonce, public_key, secret_key)
  message_len = get_size(message)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(public_key, PUBLICKEYBYTES, :PublicKey)
  check_length(secret_key, SECRETKEYBYTES, :SecretKey)

  ciphertext = zeros(message_len + MACBYTES)
  secret_key.readonly if secret_key.is_a?(Sodium::SecretBuffer)
  crypto_box_easy(ciphertext, message, message_len, nonce, public_key, secret_key)

  ciphertext
ensure
  secret_key.noaccess if secret_key.is_a?(Sodium::SecretBuffer)
end
box!(data, nonce, public_key, secret_key) click to toggle source
# File lib/crypto/box.rb, line 141
def box!(data, nonce, public_key, secret_key)
  message = String(data)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(public_key, PUBLICKEYBYTES, :PublicKey)
  check_length(secret_key, SECRETKEYBYTES, :SecretKey)

  message_len = message.bytesize
  message << zeros(MACBYTES)
  secret_key.readonly if secret_key.is_a?(Sodium::SecretBuffer)
  crypto_box_easy(message, message, message_len, nonce, public_key, secret_key)

  message
ensure
  secret_key.noaccess if secret_key.is_a?(Sodium::SecretBuffer)
end
detached(message, nonce, public_key, secret_key) click to toggle source
# File lib/crypto/box.rb, line 183
def detached(message, nonce, public_key, secret_key)
  message_len = get_size(message)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(public_key, PUBLICKEYBYTES, :PublicKey)
  check_length(secret_key, SECRETKEYBYTES, :SecretKey)

  ciphertext = zeros(message_len)
  mac = zeros(MACBYTES)
  secret_key.readonly if secret_key.is_a?(Sodium::SecretBuffer)
  crypto_box_detached(ciphertext, mac, message, message_len, nonce, public_key, secret_key)
  [ciphertext, mac]
ensure
  secret_key.noaccess if secret_key.is_a?(Sodium::SecretBuffer)
end
detached!(message, nonce, public_key, secret_key) click to toggle source
# File lib/crypto/box.rb, line 220
def detached!(message, nonce, public_key, secret_key)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(public_key, PUBLICKEYBYTES, :PublicKey)
  check_length(secret_key, SECRETKEYBYTES, :SecretKey)

  mac = zeros(MACBYTES)
  secret_key.readonly if secret_key.is_a?(Sodium::SecretBuffer)
  crypto_box_detached(message, mac, message, get_size(message), nonce, public_key, secret_key)
  [message, mac]
ensure
  secret_key.noaccess if secret_key.is_a?(Sodium::SecretBuffer)
end
keypair() click to toggle source
# File lib/crypto/box.rb, line 47
def keypair
  public_key = zeros(PUBLICKEYBYTES)
  secret_key = zeros(SECRETKEYBYTES)
  crypto_box_keypair(public_key, secret_key)

  [public_key, secret_key]
end
memory_locked_keypair() click to toggle source
# File lib/crypto/box.rb, line 68
def memory_locked_keypair
  public_key = zeros(PUBLICKEYBYTES)
  secret_key = Sodium::SecretBuffer.new(SECRETKEYBYTES)
  crypto_box_keypair(public_key, secret_key)
  secret_key.noaccess

  [public_key, secret_key]
end
memory_locked_seed_keypair(seed) click to toggle source
# File lib/crypto/box.rb, line 77
def memory_locked_seed_keypair(seed)
  check_length(seed, SEEDBYTES, :Seed)

  public_key = zeros(PUBLICKEYBYTES)
  secret_key = Sodium::SecretBuffer.new(SECRETKEYBYTES)
  seed.readonly if seed.is_a?(Sodium::SecretBuffer)
  crypto_box_seed_keypair(public_key, secret_key, seed)
  secret_key.noaccess

  [public_key, secret_key]
ensure
  seed.noaccess if seed.is_a?(Sodium::SecretBuffer)
end
nonce() click to toggle source
# File lib/crypto/box.rb, line 43
def nonce
  RandomBytes.buf(NONCEBYTES)
end
open(ciphertext, nonce, public_key, secret_key, encoding = nil) click to toggle source
# File lib/crypto/box.rb, line 120
def open(ciphertext, nonce, public_key, secret_key, encoding = nil)
  ciphertext_len = get_size(ciphertext)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(public_key, PUBLICKEYBYTES, :PublicKey)
  check_length(secret_key, SECRETKEYBYTES, :SecretKey)

  message = zeros(ciphertext_len - MACBYTES)
  secret_key.readonly if secret_key.is_a?(Sodium::SecretBuffer)
  if crypto_box_open_easy(message, ciphertext, ciphertext_len, nonce, public_key, secret_key) == -1
    raise Sodium::CryptoError, "Message forged", caller
  end

  if encoding
    message.force_encoding(encoding)
  end

  message
ensure
  secret_key.noaccess if secret_key.is_a?(Sodium::SecretBuffer)
end
open!(data, nonce, public_key, secret_key, encoding = nil) click to toggle source
# File lib/crypto/box.rb, line 157
def open!(data, nonce, public_key, secret_key, encoding = nil)
  ciphertext = String(data)
  ciphertext_len = ciphertext.bytesize
  if (message_len = ciphertext_len - MACBYTES) < 0
    fail Sodium::LengthError, "Ciphertext is too short", caller
  end

  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(public_key, PUBLICKEYBYTES, :PublicKey)
  check_length(secret_key, SECRETKEYBYTES, :SecretKey)

  secret_key.readonly if secret_key.is_a?(Sodium::SecretBuffer)
  if crypto_box_open_easy(ciphertext, ciphertext, ciphertext_len, nonce, public_key, secret_key) == -1
    raise Sodium::CryptoError, "Message forged", caller
  end
  ciphertext.slice!(message_len..-1)

  if encoding
    ciphertext.force_encoding(encoding)
  end

  ciphertext
ensure
  secret_key.noaccess if secret_key.is_a?(Sodium::SecretBuffer)
end
open_detached(ciphertext, mac, nonce, public_key, secret_key, encoding = nil) click to toggle source
# File lib/crypto/box.rb, line 198
def open_detached(ciphertext, mac, nonce, public_key, secret_key, encoding = nil)
  ciphertext_len = get_size(ciphertext)
  check_length(mac, MACBYTES, :Mac)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(public_key, PUBLICKEYBYTES, :PublicKey)
  check_length(secret_key, SECRETKEYBYTES, :SecretKey)

  message = zeros(ciphertext_len)
  secret_key.readonly if secret_key.is_a?(Sodium::SecretBuffer)
  if crypto_box_open_detached(message, ciphertext, mac, ciphertext_len, nonce, public_key, secret_key) == -1
    raise Sodium::CryptoError, "Message forged", caller
  end

  if encoding
    message.force_encoding(encoding)
  end

  message
ensure
  secret_key.noaccess if secret_key.is_a?(Sodium::SecretBuffer)
end
open_detached!(ciphertext, mac, nonce, public_key, secret_key, encoding = nil) click to toggle source
# File lib/crypto/box.rb, line 233
def open_detached!(ciphertext, mac, nonce, public_key, secret_key, encoding = nil)
  check_length(mac, MACBYTES, :Mac)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(public_key, PUBLICKEYBYTES, :PublicKey)
  check_length(secret_key, SECRETKEYBYTES, :SecretKey)

  secret_key.readonly if secret_key.is_a?(Sodium::SecretBuffer)
  if crypto_box_open_detached(ciphertext, ciphertext, mac, get_size(ciphertext), nonce, public_key, secret_key) == -1
    raise Sodium::CryptoError, "Message forged", caller
  end

  if encoding && ciphertext.respond_to?(:force_encoding)
    ciphertext.force_encoding(encoding)
  end

  ciphertext
ensure
  secret_key.noaccess if secret_key.is_a?(Sodium::SecretBuffer)
end
seed_keypair(seed) click to toggle source
# File lib/crypto/box.rb, line 55
def seed_keypair(seed)
  check_length(seed, SEEDBYTES, :Seed)

  public_key = zeros(PUBLICKEYBYTES)
  secret_key = zeros(SECRETKEYBYTES)
  seed.readonly if seed.is_a?(Sodium::SecretBuffer)
  crypto_box_seed_keypair(public_key, secret_key, seed)

  [public_key, secret_key]
ensure
  seed.noaccess if seed.is_a?(Sodium::SecretBuffer)
end