Class: Growthbook::DecryptionUtil

Inherits:
Object
  • Object
show all
Defined in:
lib/growthbook/decryption_util.rb

Overview

Utils for working with encrypted feature payloads.

Class Method Summary collapse

Class Method Details

.decrypt(payload, key:) ⇒ String?

Returns The decrypted payload, or nil if it fails to decrypt.

Returns:

  • (String, nil) —

    The decrypted payload, or nil if it fails to decrypt



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# File 'lib/growthbook/decryption_util.rb', line 10

def self.decrypt(payload, key:)
  return nil if payload.nil?
  return nil unless payload.include?('.')

  parts = payload.split('.')
  return nil if parts.length != 2

  iv = parts[0]
  decoded_iv = Base64.strict_decode64(iv)
  decoded_key = Base64.strict_decode64(key)

  cipher_text = parts[1]
  decoded_cipher_text = Base64.strict_decode64(cipher_text)

  cipher = OpenSSL::Cipher.new('aes-128-cbc')

  cipher.decrypt
  cipher.key = decoded_key
  cipher.iv = decoded_iv

  cipher.update(decoded_cipher_text) + cipher.final
rescue StandardError
  nil
end