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# -*- coding: binary -*-
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module Rex
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  module Crypto
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    module Aes256
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      # Returns an encrypted string using AES256-CBC.
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      #
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      # @param iv [String] Initialization vector.
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      # @param key [String] Secret key.
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      # @return [String] The encrypted string.
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      def self.encrypt_aes256(iv, key, value)
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        aes = OpenSSL::Cipher.new('aes-256-cbc')
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        aes.encrypt
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        aes.iv = iv
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        aes.key = key
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        aes.update(value) + aes.final
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      end
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      # Returns a decrypted string using AES256-CBC.
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      #
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      # @param iv [String] Initialization vector.
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      # @param key [String] Secret key.
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      # @return [String] The decrypted string.
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      def self.decrypt_aes256(iv, key, value)
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        aes = OpenSSL::Cipher.new('aes-256-cbc')
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        aes.decrypt
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        aes.iv = iv
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        aes.key = key
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        aes.update(value) + aes.final
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      end
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    end
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  end
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end
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