Soediro personal blog: A simple example of using AES encryption in C

/****************************************************

 * Taken from: https://gist.github.com/bricef/2436364

 ****************************************************/

#include 
#include 
#include 

/*
 * MCrypt API available online:
 * http://linux.die.net/man/3/mcrypt
 */
#include 

#include  $#include #include int encrypt(
    void* buffer,
    int buffer_len, /* Because the plaintext could include null bytes*/
    char* IV, 
    char* key,
    int key_len 
){
  MCRYPT td = mcrypt_module_open("rijndael-128", NULL, "cbc", NULL);
  int blocksize = mcrypt_enc_get_block_size(td);
  if( buffer_len % blocksize != 0 ){return 1;}

  mcrypt_generic_init(td, key, key_len, IV);
  mcrypt_generic(td, buffer, buffer_len);
  mcrypt_generic_deinit (td);
  mcrypt_module_close(td);
  
  return 0;
}

int decrypt(
    void* buffer,
    int buffer_len,
    char* IV, 
    char* key,
    int key_len 
){
  MCRYPT td = mcrypt_module_open("rijndael-128", NULL, "cbc", NULL);
  int blocksize = mcrypt_enc_get_block_size(td);
  if( buffer_len % blocksize != 0 ){return 1;}
  
  mcrypt_generic_init(td, key, key_len, IV);
  mdecrypt_generic(td, buffer, buffer_len);
  mcrypt_generic_deinit (td);
  mcrypt_module_close(td);
  
  return 0;
}

void display(char* ciphertext, int len){
  int v;
  for (v=0; v$

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Sunday, May 25, 2014

A simple example of using AES encryption in C

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