Class: Sekrit::Decoder

Inherits:
Object show all
Defined in:
lib/sekrit/decoder.rb

Instance Method Summary collapse

Constructor Details

#initialize(password: String) ⇒ Decoder

Returns a new instance of Decoder.



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# File 'lib/sekrit/decoder.rb', line 9

def initialize(password: String)
  @password = password
end

Instance Method Details

#decode(string: String) ⇒ Object

[bsarrazin] July 20th, 2019 Stolen from Fastlane, as I am not an expert on encryption/decryption. If you have experience and want to help, please submit a pull request :)

We encrypt with MD5 because that was the most common default value in older fastlane versions which used the local OpenSSL installation A more secure key and IV generation is needed in the future, IV should be randomly generated and provided unencrypted salt should be randomly generated and provided unencrypted (like in the current implementation) key should be generated with OpenSSL::KDF::pbkdf2_hmac with properly chosen parameters Short explanation about salt and IV: https://stackoverflow.com/a/1950674/6324550



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# File 'lib/sekrit/decoder.rb', line 22

def decode(string: String)
  data = Base64.decode64(string)
  salt = data[8..15]
  data = data[16..-1]

  decipher = OpenSSL::Cipher.new('AES-256-CBC')
  decipher.decrypt
  decipher.pkcs5_keyivgen(@password, salt, 1, "MD5")

  decipher.update(data) + decipher.final
end