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|
#include "secure.h"
#include "base64.h"
#include <stdio.h>
#define HASH_MODE MHASH_SHA1
char *
my_hash (char *data)
{
MHASH td;
unsigned char *hash =
malloc (mhash_get_block_size (MHASH_SHA1) * sizeof (char) + 1);
memset (hash, '\0', mhash_get_block_size (MHASH_SHA1));
td = mhash_init (HASH_MODE);
mhash (td, data, (int) strlen (data));
mhash_deinit (td, hash);
char *hashstr =
malloc ((mhash_get_block_size (MHASH_SHA1) * sizeof (char) * 2) + 1);
memset (hashstr, '\0', mhash_get_block_size (MHASH_SHA1));
int i;
char tmp[2];
sprintf (tmp, "%.2x", hash[0]);
strcpy (hashstr, tmp);
for (i = 1; i < mhash_get_block_size (MHASH_SHA1); ++i)
{
sprintf (tmp, "%.2x", hash[i]);
strcat (hashstr, tmp);
}
free (hash);
return hashstr;
}
char *
my_encrypt (const char *data, const char *password)
{
#ifndef PLAINTTEXT
#ifdef DEBUG
printf
("--------------------------------------- Module de Cryptage ----------------------------------------\n");
#endif
MCRYPT td;
int ivsize, keysize, datasize, passsize;
int i;
char *IV;
char *key;
char *encrypt;
char *pass;
char *algo = "rijndael-128";
char *mode = "cfb";
if (mcrypt_module_self_test (algo, NULL) != 0)
{
fprintf (stderr, "Did not pass the test\n");
exit (1);
}
td = mcrypt_module_open (algo, NULL, mode, NULL);
if (td != MCRYPT_FAILED)
{
// Key initialisation
passsize = strlen (password);
pass = calloc (1, passsize);
memset (pass, '\0', passsize);
memmove (pass, password, passsize);
keysize = mcrypt_enc_get_key_size (td);
key = calloc (1, keysize);
if (mhash_keygen(KEYGEN_MCRYPT, MHASH_SHA1, 0, key, keysize, NULL, 0,(unsigned char *) pass, passsize) != 0)
{
fprintf (stderr, "Couldn't get hash from key\n");
exit (1);
}
// IV initialisation
srand (time (0));
ivsize = mcrypt_enc_get_iv_size (td);
IV = calloc (1, ivsize + 1);
memset (IV, '\0', ivsize + 1);
for (i = 0; i < ivsize; ++i)
{
//IV[i] = rand ();
IV[i] = 1;
}
// initialisation td
if (mcrypt_generic_init (td, key, keysize, IV) < 0)
{
fprintf (stderr, "Couldn't initialize algorithm\n");
exit (1);
}
datasize = strlen (data);
encrypt = malloc (sizeof (char) * datasize + 1);
memset (encrypt, '\0', datasize + 1);
memmove (encrypt, data, datasize);
#ifdef DEBUG
printf ("\t Avant Cryptage : %s\n", encrypt);
#endif
// encryption
if (mcrypt_generic (td, encrypt, datasize) != 0)
{
fprintf (stderr, "Couldn't encrypt\n");
exit (1);
}
}
else
{
fprintf (stderr, "Couldn't open module %s\n", algo);
exit (1);
}
#ifdef DEBUG
printf ("\t Apres Encrypt : %s\n", encrypt);
printf ("\t IV : %s\n", IV);
#endif
// On encode le message crypté et l'IV séparé par :
size_t len;
char *base64encrypt =(char *) base64_encode ((unsigned char *) encrypt, strlen (encrypt),&len);
char *base64IV =(char *) base64_encode ((unsigned char *) IV, strlen (IV), &len);
int size_result = strlen (base64encrypt) + strlen (base64IV) + 2;
char *result = malloc (sizeof (char) * size_result);
#ifdef DEBUG
printf ("\t Base64 Encrypt : %s\n", base64encrypt);
printf ("\t Base64 IV : %s\n", base64IV);
#endif
memset (result, '\0', size_result);
sprintf (result, "%s:%s", base64encrypt, base64IV);
// free
mcrypt_generic_deinit (td);
mcrypt_module_close (td);
free (key);
free (pass);
free (IV);
free (encrypt);
free (base64encrypt);
free (base64IV);
#ifdef DEBUG
printf
("---------------------------------------- Fin de Cryptage ----------------------------------------\n");
#endif
return result;
#else
char *tmp = malloc (sizeof (char) * strlen (data) + 1);
memset (tmp, '\0', strlen (data) + 1);
tmp = strcpy (tmp, data);
return tmp;
#endif
}
char *
my_decrypt (const char *data, const char *password)
{
#ifndef PLAINTTEXT
#ifdef DEBUG
printf
("-------------------------------------- Module de Decryptage ---------------------------------------\n");
#endif
MCRYPT td;
int keysize, datasize, passsize;
char *key;
char *decrypt;
char *pass;
char *IV;
char *encrypt;
size_t size_encrypt, len;
char *tmp = malloc (sizeof (char) * strlen (data) + 1);
memset (tmp, '\0', strlen (data) + 1);
tmp = strcpy (tmp, data);
char *base64encrypt = strtok (tmp, ":");
char *base64IV = strtok (NULL, "\0");
#ifdef DEBUG
printf ("\t Base64 Encrypt : %s\n", base64encrypt);
printf ("\t Base64 IV : %s\n", base64IV);
#endif
encrypt =(char *) base64_decode ((unsigned char *) base64encrypt,
strlen (base64encrypt), &size_encrypt);
IV =(char *) base64_decode ((unsigned char *) base64IV, strlen (base64IV),
&len);
#ifdef DEBUG
printf ("\t Encrypt : %s\n", encrypt);
printf ("\t IV : %s\n", IV);
#endif
char *algo = "rijndael-128";
char *mode = "cfb";
if (mcrypt_module_self_test (algo, NULL) != 0)
{
fprintf (stderr, "Did not pass the test\n");
exit (1);
}
td = mcrypt_module_open (algo, NULL, mode, NULL);
if (td != MCRYPT_FAILED)
{
/*
// recup du pointeur sur le ":" en partant de la fin de data et à partir d'au moins la taille de l'iv (au cas ou l'IV contienne des ":")
char *base64IV = memrchr (data, ':', strlen(data)-mcrypt_enc_get_iv_size(td));
// pointeur +1 pour pas avoir le ":"
base64IV = base64IV+1;
int encryptsize = strlen(data)-strlen(base64IV);
char *base64encrypt = malloc (encryptsize);
strncpy (base64encrypt, data, encryptsize);
#ifdef DEBUG
printf ("\t Base64 Encrypt : %s\n", base64encrypt);
printf ("\t Base64 IV : %s\n", base64IV);
#endif
char *encrypt =(char *) base64_decode ((unsigned char *) base64encrypt,
strlen (base64encrypt), &size_encrypt);
IV =(char *) base64_decode ((unsigned char *) base64IV, strlen (base64IV),
&len);
#ifdef DEBUG
printf ("\t Encrypt : %s\n", encrypt);
printf ("\t IV : %s\n", IV);
#endif
*/
// Key initialisation
passsize = strlen (password);
pass = calloc (1, passsize);
memset (pass, '\0', passsize);
memmove (pass, password, passsize);
keysize = mcrypt_enc_get_key_size (td);
key = calloc (1, keysize);
if (mhash_keygen(KEYGEN_MCRYPT, MHASH_SHA1, 0, key, keysize, NULL, 0,(unsigned char *) pass, passsize) != 0)
{
fprintf (stderr, "Couldn't get hash from key\n");
exit (1);
}
// initialisation
if (mcrypt_generic_init (td, key, keysize, IV) < 0)
{
fprintf (stderr, "Couldn't initialize algorithm\n");
exit (1);
}
// data copy
datasize = size_encrypt;
decrypt = calloc (1, datasize + 1);
memset (decrypt, '\0', datasize + 1);
memmove (decrypt, encrypt, datasize);
#ifdef DEBUG
printf ("\t Avant Decryptage : %s\n", decrypt);
#endif
// decryption
if (mdecrypt_generic (td, decrypt, datasize) != 0)
{
fprintf (stderr, "Couldn't encrypt\n");
exit (1);
}
}
else
{
fprintf (stderr, "Couldn't open module %s\n", algo);
exit (1);
}
#ifdef DEBUG
printf ("\t Après Decryptage : %s\n", decrypt);
#endif
//free
mcrypt_generic_deinit (td);
mcrypt_module_close (td);
free (key);
free (pass);
//free (tmp);
free (IV);
free (encrypt);
#ifdef DEBUG
printf
("---------------------------------------- Fin de Decryptage ----------------------------------------\n");
#endif
return decrypt;
#else
char *tmp = malloc (sizeof (char) * strlen (data) + 1);
tmp = strcpy (tmp, data);
return tmp;
#endif
} |
