Class: IdCipher::IntegerCipher

Inherits:
Object
  • Object
show all
Defined in:
lib/id_cipher.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ IntegerCipher

this crypto method use ARC4 cipher integer ARC4加密算法优点是速度快, 基于bit位xor的算法该算法在一定数量后会重复,既存在最大值,超过最大值后无法区分当前是原文还是密文该算法设计只用于加密正整数,加密范围为整数长整型



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# File 'lib/id_cipher.rb', line 30

def initialize
  @cipher = OpenSSL::Cipher::Cipher.new('rc4')
end

Instance Method Details

#decrypt(eid) ⇒ Object 



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# File 'lib/id_cipher.rb', line 55

def decrypt(eid)
  eid = eid.to_i
  @cipher.decrypt
  @cipher.key = key
  self.unpack @cipher.update(self.pack(eid))
end

#encrypt(id) ⇒ Object 



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# File 'lib/id_cipher.rb', line 48

def encrypt(id)
  id = id.to_i
  @cipher.encrypt
  @cipher.key = key
  self.unpack @cipher.update(self.pack(id))
end

#key ⇒ Object 



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# File 'lib/id_cipher.rb', line 34

def key
  (defined? Setting) && Setting.id_cipher_key ||
      IdCipher::KEY ||
      (raise TypeError, 'no cipher key found. you can set key within Settings.yml, id_cipher_key="cipher slat" or refine IdCipher::KEY')
end

#pack(number) ⇒ Object 



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# File 'lib/id_cipher.rb', line 40

def pack(number)
  [number].pack('L')
end

#unpack(crypto_text) ⇒ Object 



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# File 'lib/id_cipher.rb', line 44

def unpack(crypto_text)
  crypto_text.unpack('L')[0]
end