Module: Noteshred::Crypto::V4

Defined in:
lib/noteshred/crypto.rb

Constant Summary collapse

ITERATIONS = 
20000

Class Method Summary collapse

Class Method Details

.decrypt(content, pass, salt, iv) ⇒ Object

Expects UTF-8 encoded strings from the encrypt method



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# File 'lib/noteshred/crypto.rb', line 29

def self.decrypt(content,pass,salt,iv)
  content    = Noteshred::Tools.decode_utf8(content)
  cipher     = OpenSSL::Cipher.new('AES-256-CBC')
  cipher.decrypt
  cipher.iv  = Noteshred::Tools.decode_utf8(iv)
  cipher.key = OpenSSL::PKCS5.pbkdf2_hmac_sha1(pass, salt, ITERATIONS, cipher.key_len)
  result     = cipher.update(content)
  result << cipher.final
end

.encrypt(content, pass) ⇒ Object

Outputs UTF-8 encoded object for storing in database

Raises:

  • (ArgumentError) 


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# File 'lib/noteshred/crypto.rb', line 11

def self.encrypt(content,pass)
  raise ArgumentError, 'Content and password required' if content.empty? || pass.empty?
  cipher     = OpenSSL::Cipher.new('AES-256-CBC')
  cipher.encrypt
  iv         = cipher.random_iv
  salt       = SecureRandom.hex(16)
  cipher.key = OpenSSL::PKCS5.pbkdf2_hmac_sha1(pass, salt, ITERATIONS, cipher.key_len)
  result     = cipher.update(content)
  result << cipher.final
  return {
    :content => Noteshred::Tools.encode_utf8(result),
    :iv      => Noteshred::Tools.encode_utf8(iv),
    :salt    => salt,
    :version => 4
  }
end

.hash(pass, salt) ⇒ Object 



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# File 'lib/noteshred/crypto.rb', line 39

def self.hash(pass,salt)
  return OpenSSL::PKCS5::pbkdf2_hmac_sha1(pass, salt, ITERATIONS, 32)
end