DES library

Data encryption standard

Brief

DES encrypt algorithm is Symmetric encryption.DES encryption library using c++ implement.When use in your project only include header file,and use public method.

How to use

DES.hpp & fileDES.hpp in src dictionary

• include"DES.hpp" Original encrypt library
• include"fileDES.hpp" File encrypt library

DES:public function

DES is a static class, straightly use its public function.

• encrypt :

  • @param: in,key (bitset<64>) 64bitset input and cipher
  • @return: ciphertext (bitset<64>) 64bitset result

• decrypt :

  • @param: ciphertext ,key (bitset<64>) 64bitset ciphertext and cipher
  • @return: result (bitset<64>) 64bitset result

• toString :

  • @brief: translate from bitset<64> to hexadecimal format
  • @param: in (bitset<64>) 64bitset input
  • @return: result (string)

fileDES:public function

FileDES is a common class,need an instance to use it.

• setInput

  • @brief: set input filepath and open it
  • @param: filepath(string)
  • @return: void

• setOutput

  • @brief: set output filepath and mode and open it
  • @param: filepath(string), mode = 0 encrypt,mode = 1 decrypt.
  • @return: void

• setKey

  • @brief: set cipher
  • @param: cipher(string)

• encryptFile

  • @brief: encrypt input file and get ciphertext in output file

• decryptFile

  • @brief: decrypt input file and get source file in output file

Example

    FileDES des;
    des.setInput("../data/input.txt"); ///your input file path
    des.setOutput("../data/encrypt.txt",0); ///your encrypt output file path
    des.setKey("123456"); ///your key
    des.encryptFile(); ///encrypt file
    des.setOutput("../data/decrypt.txt",1); ///your decrypt output file path
    des.decryptFile(); ///decrypt file

Reference

DATA ENCRYPTION STANDARD (DES) fips-46-3