linD026 / Data-Encryption-Standard

Userspace DES algorithm from Linux kernel

Data-Encryption-Standard

How to use

$ make
cc -o test des.c -g  -Wall -O2

Example:

• encrypt:

  $ ./test -e "test one \ two , three "
  ---
  original text (ceil size 24 bytes, size 23 bytes):
  
  [HEX]
  "656e6f2074736574 2c206f7774205c20 0020656572687420 "
  
  Encrypt text:
  
  [HEX]
  "5d44496ed7671f38 63cae82907dc1395 f83932ad6f8edb47 "
  [TEXT]
  "8g�nID]��)��cGێo�29�"
  ---
  

• decrypt:

  $ ./test -d "5d44496ed7671f38 63cae82907dc1395 f83932ad6f8edb47 "
  ---
  original text (ceil size 24 bytes, size 51 bytes):
  
  [HEX]
  "5d44496ed7671f38 63cae82907dc1395 f83932ad6f8edb47 "
  
  Decrypt text:
  
  [HEX]
  "656e6f2074736574 2c206f7774205c20 0020656572687420 "
  [TEXT]
  "test one \ two , three "
  ---
  

• encrypt then immediately decrypt (test):

  $ ./test -a "test one \ two , three "
  ---
  original text (ceil size 24 bytes, size 23 bytes):
  
  [HEX]
  "656e6f2074736574 2c206f7774205c20 0020656572687420 "
  
  Encrypt text:
  
  [HEX]
  "5d44496ed7671f38 63cae82907dc1395 f83932ad6f8edb47 "
  [TEXT]
  "8g�nID]��)��cGێo�29�"
  
  Decrypt text:
  
  [HEX]
  "656e6f2074736574 2c206f7774205c20 0020656572687420 "
  [TEXT]
  "test one \ two , three "
  
  Passed
  ---