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