ftp-manager/app/services/crypt_serializer.rb

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# frozen_string_literal: true
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require 'openssl'
require 'base64'
class CryptSerializer
attr_reader :cipher
class << self
# pulling from DB - return plain value
def load value
new.decrypt value
end
# saving to DB - return encrypted value
def dump value
new.encrypt value
end
end
def initialize
@cipher = OpenSSL::Cipher::AES.new(256, :CBC)
end
def encrypt(value)
return value if value.nil?
unless value.is_a?(String)
raise "Attribute was supposed to be a `String`, but was instead a `#{value.class}`"
end
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build_cipher value
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end
def decrypt(value)
return value if value.nil?
parts = Marshal.load Base64.urlsafe_decode64(value)
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decode_cipher parts
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end
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private
def build_cipher value
cipher.encrypt
parts = [cipher.random_key, cipher.random_iv, cipher.update(value) + cipher.final]
Base64.urlsafe_encode64 Marshal.dump(parts)
end
def decode_cipher parts
cipher.decrypt
cipher.key = parts[0]
cipher.iv = parts[1]
cipher.update(parts[2]) + cipher.final
end
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end