晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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DIR:/opt/alt/ruby33/share/ruby/openssl/
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Current File : //opt/alt/ruby33/share/ruby/openssl/hmac.rb
# frozen_string_literal: true

module OpenSSL
  class HMAC
    # Securely compare with another HMAC instance in constant time.
    def ==(other)
      return false unless HMAC === other
      return false unless self.digest.bytesize == other.digest.bytesize

      OpenSSL.fixed_length_secure_compare(self.digest, other.digest)
    end

    # :call-seq:
    #    hmac.base64digest -> string
    #
    # Returns the authentication code an a Base64-encoded string.
    def base64digest
      [digest].pack("m0")
    end

    class << self
      # :call-seq:
      #    HMAC.digest(digest, key, data) -> aString
      #
      # Returns the authentication code as a binary string. The _digest_ parameter
      # specifies the digest algorithm to use. This may be a String representing
      # the algorithm name or an instance of OpenSSL::Digest.
      #
      # === Example
      #  key = 'key'
      #  data = 'The quick brown fox jumps over the lazy dog'
      #
      #  hmac = OpenSSL::HMAC.digest('SHA1', key, data)
      #  #=> "\xDE|\x9B\x85\xB8\xB7\x8A\xA6\xBC\x8Az6\xF7\n\x90p\x1C\x9D\xB4\xD9"
      def digest(digest, key, data)
        hmac = new(key, digest)
        hmac << data
        hmac.digest
      end

      # :call-seq:
      #    HMAC.hexdigest(digest, key, data) -> aString
      #
      # Returns the authentication code as a hex-encoded string. The _digest_
      # parameter specifies the digest algorithm to use. This may be a String
      # representing the algorithm name or an instance of OpenSSL::Digest.
      #
      # === Example
      #  key = 'key'
      #  data = 'The quick brown fox jumps over the lazy dog'
      #
      #  hmac = OpenSSL::HMAC.hexdigest('SHA1', key, data)
      #  #=> "de7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9"
      def hexdigest(digest, key, data)
        hmac = new(key, digest)
        hmac << data
        hmac.hexdigest
      end

      # :call-seq:
      #    HMAC.base64digest(digest, key, data) -> aString
      #
      # Returns the authentication code as a Base64-encoded string. The _digest_
      # parameter specifies the digest algorithm to use. This may be a String
      # representing the algorithm name or an instance of OpenSSL::Digest.
      #
      # === Example
      #  key = 'key'
      #  data = 'The quick brown fox jumps over the lazy dog'
      #
      #  hmac = OpenSSL::HMAC.base64digest('SHA1', key, data)
      #  #=> "3nybhbi3iqa8ino29wqQcBydtNk="
      def base64digest(digest, key, data)
        [digest(digest, key, data)].pack("m0")
      end
    end
  end
end