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我不完全确定，当您添加has_secure_passwordRails 模型时，是否涉及任何加密。我知道肯定有盐散列，但是有加密吗？bcrypt 可以使用河豚，但它是否被用于bcrypt-ruby（这一切背后的宝石）？

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TL;DR :has_secure_password会让你在使用该self.password=方法时使用 Bcrypt 的哈希函数。

让我们看一下代码has_secure_password：

    # File activemodel/lib/active_model/secure_password.rb, line 53
    def has_secure_password(options = {})
      # Load bcrypt gem only when has_secure_password is used.
      # This is to avoid ActiveModel (and by extension the entire framework)
      # being dependent on a binary library.
      begin
        require "bcrypt"
      rescue LoadError
        $stderr.puts "You don't have bcrypt installed in your application. Please add it to your Gemfile and run bundle install"
        raise
      end

      include InstanceMethodsOnActivation

      if options.fetch(:validations, true)
        include ActiveModel::Validations

        # This ensures the model has a password by checking whether the password_digest
        # is present, so that this works with both new and existing records. However,
        # when there is an error, the message is added to the password attribute instead
        # so that the error message will make sense to the end-user.
        validate do |record|
          record.errors.add(:password, :blank) unless record.password_digest.present?
        end

        validates_length_of :password, maximum: ActiveModel::SecurePassword::MAX_PASSWORD_LENGTH_ALLOWED
        validates_confirmation_of :password, allow_blank: true
      end
    end

我们可以看到它不会散列/加密任何东西。尽管如此，我们注意到：

      include InstanceMethodsOnActivation

如果我们继续查看文档，InstanceMethodsOnActivation我们会得到以下代码：

def password=(unencrypted_password)
  if unencrypted_password.nil?
    self.password_digest = nil
  elsif !unencrypted_password.empty?
    @password = unencrypted_password
    cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST : BCrypt::Engine.cost
    self.password_digest = BCrypt::Password.create(unencrypted_password, cost: cost)
  end
end

因此，has_secure_password不加密/散列任何内容，但包括InstanceMethodsOnActivation模块。这个模块定义了password=方法。该方法的重要部分是：

self.password_digest = BCrypt::Password.create(unencrypted_password, cost: cost)

我们现在去看看BCrypt::Password.create's 的代码：

  def create(secret, options = {})
    cost = options[:cost] || BCrypt::Engine.cost
    raise ArgumentError if cost > 31
    Password.new(BCrypt::Engine.hash_secret(secret, BCrypt::Engine.generate_salt(cost)))
  end

  def valid_hash?(h)
    h =~ /^\$[0-9a-z]{2}\$[0-9]{2}\$[A-Za-z0-9\.\/]{53}$/
  end
end

在这种方法中，我们特别注意到：

Password.new(BCrypt::Engine.hash_secret(secret, BCrypt::Engine.generate_salt(cost)))

所以它似乎是一个哈希，这是合乎逻辑的（无论如何你都不想解密密码）。

于 2017-06-02T12:22:24.217 回答