module Crypto::SecretBox

Constants

KEYBYTES
MACBYTES
NONCEBYTES
PRIMITIVE

Public Instance Methods

detached(message, nonce, key) click to toggle source
# File lib/crypto/secret_box.rb, line 110
def detached(message, nonce, key)
  message_len = get_size(message)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(key, KEYBYTES, :SecretKey)

  ciphertext = zeros(message_len)
  mac = zeros(MACBYTES)
  key.readonly if key.is_a?(Sodium::SecretBuffer)
  crypto_secretbox_detached(ciphertext, mac, message, message_len, nonce, key)

  [ciphertext, mac]
ensure
  key.noaccess if key.is_a?(Sodium::SecretBuffer)
end
detached!(message, nonce, key) click to toggle source
# File lib/crypto/secret_box.rb, line 146
def detached!(message, nonce, key)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(key, KEYBYTES, :SecretKey)

  mac = zeros(MACBYTES)
  key.readonly if key.is_a?(Sodium::SecretBuffer)
  crypto_secretbox_detached(message, mac, message, get_size(message), nonce, key)

  [message, mac]
ensure
  key.noaccess if key.is_a?(Sodium::SecretBuffer)
end
nonce() click to toggle source
# File lib/crypto/secret_box.rb, line 32
def nonce
  RandomBytes.buf(NONCEBYTES)
end
open(ciphertext, nonce, key, encoding = nil) click to toggle source
# File lib/crypto/secret_box.rb, line 50
def open(ciphertext, nonce, key, encoding = nil)
  ciphertext_len = get_size(ciphertext)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(key, KEYBYTES, :SecretKey)

  decrypted = zeros(ciphertext_len - MACBYTES)
  key.readonly if key.is_a?(Sodium::SecretBuffer)
  if crypto_secretbox_open_easy(decrypted, ciphertext, ciphertext_len, nonce, key) == -1
    raise Sodium::CryptoError, "Message forged", caller
  end

  if encoding
    decrypted.force_encoding(encoding)
  end

  decrypted
ensure
  key.noaccess if key.is_a?(Sodium::SecretBuffer)
end
open!(data, nonce, key, encoding = nil) click to toggle source
# File lib/crypto/secret_box.rb, line 85
def open!(data, nonce, key, encoding = nil)
  ciphertext = String(data)

  if (message_len = (ciphertext_len = ciphertext.bytesize) - MACBYTES) < 0
    fail Sodium::LengthError, "Ciphertext is too short", caller
  end

  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(key, KEYBYTES, :SecretKey)

  key.readonly if key.is_a?(Sodium::SecretBuffer)
  if crypto_secretbox_open_easy(ciphertext, ciphertext, ciphertext_len, nonce, key) == -1
    raise Sodium::CryptoError, "Message forged", caller
  end

  ciphertext.slice!(message_len..-1)
  if encoding
    ciphertext.force_encoding(encoding)
  end

  ciphertext
ensure
  key.noaccess if key.is_a?(Sodium::SecretBuffer)
end
open_detached(ciphertext, mac, nonce, key, encoding = nil) click to toggle source
# File lib/crypto/secret_box.rb, line 125
def open_detached(ciphertext, mac, nonce, key, encoding = nil)
  ciphertext_len = get_size(ciphertext)
  check_length(mac, MACBYTES, :Mac)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(key, KEYBYTES, :SecretKey)

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

  if encoding
    message.force_encoding(encoding)
  end

  message
ensure
  key.noaccess if key.is_a?(Sodium::SecretBuffer)
end
open_detached!(ciphertext, mac, nonce, key, encoding = nil) click to toggle source
# File lib/crypto/secret_box.rb, line 159
def open_detached!(ciphertext, mac, nonce, key, encoding = nil)
  check_length(mac, MACBYTES, :Mac)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(key, KEYBYTES, :SecretKey)

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

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

  ciphertext
ensure
  key.noaccess if key.is_a?(Sodium::SecretBuffer)
end
secretbox(message, nonce, key) click to toggle source
# File lib/crypto/secret_box.rb, line 36
def secretbox(message, nonce, key)
  message_len = get_size(message)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(key, KEYBYTES, :SecretKey)

  ciphertext = zeros(message_len + MACBYTES)
  key.readonly if key.is_a?(Sodium::SecretBuffer)
  crypto_secretbox_easy(ciphertext, message, message_len, nonce, key)

  ciphertext
ensure
  key.noaccess if key.is_a?(Sodium::SecretBuffer)
end
secretbox!(data, nonce, key) click to toggle source
# File lib/crypto/secret_box.rb, line 70
def secretbox!(data, nonce, key)
  message = String(data)
  check_length(nonce, NONCEBYTES, :Nonce)
  check_length(key, KEYBYTES, :SecretKey)

  message_len = message.bytesize
  message << zeros(MACBYTES)
  key.readonly if key.is_a?(Sodium::SecretBuffer)
  crypto_secretbox_easy(message, message, message_len, nonce, key)

  message.force_encoding(Encoding::ASCII_8BIT)
ensure
  key.noaccess if key.is_a?(Sodium::SecretBuffer)
end