Class: GLogin::Codec

Inherits:
Object
  • Object
show all
Defined in:
lib/glogin/codec.rb

Overview

The codec

Defined Under Namespace

Classes: DecodingError

Instance Method Summary collapse

Constructor Details

#initialize(secret = '', base64: false) ⇒ Codec

Ctor. secret: The secret to do the encoding base64: If TRUE, Base-64 will be used, otherwise Base-58



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# File 'lib/glogin/codec.rb', line 43

def initialize(secret = '', base64: false)
  raise 'Secret can\'t be nil' if secret.nil?
  @secret = secret
  @base64 = base64
end

Instance Method Details

#decrypt(text) ⇒ Object 



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# File 'lib/glogin/codec.rb', line 49

def decrypt(text)
  raise 'Text can\'t be nil' if text.nil?
  if @secret.empty?
    text
  else
    cpr = cipher
    cpr.decrypt
    cpr.key = digest(cpr.key_len)
    if @base64
      raise DecodingError, 'This is not Base64' unless %r{^[a-zA-Z0-9\\+/=]+$}.match?(text)
    else
      raise DecodingError, 'This is not Base58' unless /^[a-zA-Z0-9]+$/.match?(text)
    end
    plain = @base64 ? Base64.decode64(text) : Base58.base58_to_binary(text)
    raise DecodingError if plain.empty?
    decrypted = cpr.update(plain)
    decrypted << cpr.final
    salt, body = decrypted.to_s.split(' ', 2)
    raise DecodingError if salt.empty?
    raise DecodingError if body.nil?
    body.force_encoding('UTF-8')
    body
  end
rescue OpenSSL::Cipher::CipherError => e
  raise DecodingError, e.message
end

#encrypt(text) ⇒ Object 



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# File 'lib/glogin/codec.rb', line 76

def encrypt(text)
  raise 'Text can\'t be nil' if text.nil?
  if @secret.empty?
    text
  else
    cpr = cipher
    cpr.encrypt
    cpr.key = digest(cpr.key_len)
    salt = SecureRandom.base64(Random.rand(8..32))
    encrypted = cpr.update("#{salt} #{text}")
    encrypted << cpr.final
    @base64 ? Base64.encode64(encrypted).gsub("\n", '') : Base58.binary_to_base58(encrypted)
  end
end