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@ -0,0 +1,29 @@
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/******************************************************************************/
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||||
/* MCrypt, by LoRd_MuldeR <MuldeR2@GMX.de> */
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/* This work has been released under the CC0 1.0 Universal license! */
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/******************************************************************************/
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#ifndef INC_MCYRPT_H
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#define INC_MCYRPT_H
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#include <stdlib.h>
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#include <stdint.h>
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extern const char *const LIBMCRYPT_VERSION;
|
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extern const char* const LIBMCRYPT_BUILD;
|
||||
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||||
typedef uintptr_t mcrypt_t;
|
||||
|
||||
int mcrypt_generate_seed(uint64_t* const seed);
|
||||
|
||||
mcrypt_t mcrypt_init(const uint64_t salt, const char* const passphrase);
|
||||
void mcrypt_free(const mcrypt_t context);
|
||||
|
||||
int mcrypt_enc_process(const mcrypt_t context, const uint8_t* const input, uint8_t* const output, size_t length);
|
||||
int mcrypt_enc_process_inplace(const mcrypt_t context, uint8_t* const buffer, size_t length);
|
||||
|
||||
int mcrypt_dec_process(const mcrypt_t context, const uint8_t* const input, uint8_t* const output, size_t length);
|
||||
int mcrypt_dec_process_inplace(const mcrypt_t context, uint8_t* const buffer, size_t length);
|
||||
|
||||
|
||||
#endif
|
||||
|
|
@ -0,0 +1,170 @@
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|
|
@ -0,0 +1,295 @@
|
|||
/******************************************************************************/
|
||||
/* MCrypt, by LoRd_MuldeR <MuldeR2@GMX.de> */
|
||||
/* This work has been released under the CC0 1.0 Universal license! */
|
||||
/******************************************************************************/
|
||||
|
||||
#ifdef _WIN32
|
||||
#define _CRT_RAND_S 1
|
||||
#endif
|
||||
|
||||
#include <mcrypt.h>
|
||||
#include <string.h>
|
||||
|
||||
const char* const LIBMCRYPT_VERSION = "1.0.0";
|
||||
const char* const LIBMCRYPT_BUILD = __DATE__" "__TIME__;
|
||||
|
||||
typedef struct
|
||||
{
|
||||
uint8_t box[256U][256U];
|
||||
uint8_t inv[256U][256U];
|
||||
uint8_t off[256U];
|
||||
uint8_t pos;
|
||||
}
|
||||
crypt_state_t;
|
||||
|
||||
typedef struct
|
||||
{
|
||||
uint32_t a, b, c, d;
|
||||
uint32_t counter;
|
||||
}
|
||||
rand_state_t;
|
||||
|
||||
// ==========================================================================
|
||||
// Utilities
|
||||
// ==========================================================================
|
||||
|
||||
static int random_bytes(uint8_t* const buffer, const size_t length)
|
||||
{
|
||||
#ifdef _WIN32
|
||||
size_t pos = 0U;
|
||||
while (pos < length)
|
||||
{
|
||||
const size_t bytes_left = length - pos;
|
||||
const size_t bytes_copy = (bytes_left < sizeof(uint32_t)) ? bytes_left : sizeof(uint32_t);
|
||||
uint32_t temp;
|
||||
if (rand_s(&temp) != 0)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
for (size_t i = 0; i < bytes_copy; ++i)
|
||||
{
|
||||
buffer[pos++] = (uint8_t)(temp & 0xFF);
|
||||
temp >>= 8;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
#else
|
||||
#ifdef __unix__
|
||||
static const char* const PATH[] = { "/dev/urandom", "/dev/random" };
|
||||
int result = -1;
|
||||
for (size_t i = 0; (i < 2U) && (result < 0); ++i)
|
||||
{
|
||||
const int fd = open(PATH[i], O_RDONLY);
|
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if (fd >= 0)
|
||||
{
|
||||
if (read(fd, buffer, length) < length)
|
||||
{
|
||||
result = 0;
|
||||
}
|
||||
close(fd);
|
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}
|
||||
}
|
||||
return result;
|
||||
#else
|
||||
#error Unsupported target platform!
|
||||
#endif
|
||||
#endif
|
||||
}
|
||||
|
||||
static void erase(void* ptr, const size_t length)
|
||||
{
|
||||
volatile uint8_t* buffer = ptr;
|
||||
for (size_t i = 0U; i < length; ++i)
|
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{
|
||||
buffer[i] = 0U;
|
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}
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}
|
||||
|
||||
// ==========================================================================
|
||||
// Hash function
|
||||
// ==========================================================================
|
||||
|
||||
static void hash_update(uint64_t* const h, const uint8_t* const data, const size_t data_len)
|
||||
{
|
||||
for (size_t i = 0U; i < data_len; ++i)
|
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{
|
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*h ^= data[i];
|
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*h *= 0x00000100000001B3ull;
|
||||
}
|
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}
|
||||
|
||||
static uint64_t hash_code(const uint64_t salt, const uint8_t pepper, const uint8_t* const data, const size_t data_len)
|
||||
{
|
||||
uint64_t h = 0xCBF29CE484222325ull;
|
||||
hash_update(&h, (uint8_t*)&salt, sizeof(uint64_t));
|
||||
hash_update(&h, &pepper, 1U);
|
||||
hash_update(&h, data, data_len);
|
||||
return h;
|
||||
}
|
||||
|
||||
// ==========================================================================
|
||||
// PRNG
|
||||
// ==========================================================================
|
||||
|
||||
static void random_init(rand_state_t* const state, const uint64_t seed_0, const uint64_t seed_1)
|
||||
{
|
||||
state->counter = 0U;
|
||||
state->a = (uint32_t)(seed_0 & 0xFFFFFFFF);
|
||||
state->b = (uint32_t)((seed_0 >> 32) & 0xFFFFFFFF);
|
||||
state->c = (uint32_t)(seed_1 & 0xFFFFFFFF);
|
||||
state->d = (uint32_t)((seed_1 >> 32) & 0xFFFFFFFF);
|
||||
}
|
||||
|
||||
static uint32_t random_next(rand_state_t* const state)
|
||||
{
|
||||
uint32_t t = state->d;
|
||||
const uint32_t s = state->a;
|
||||
state->d = state->c;
|
||||
state->c = state->b;
|
||||
state->b = s;
|
||||
t ^= t >> 2;
|
||||
t ^= t << 1;
|
||||
t ^= s ^ (s << 4);
|
||||
state->a = t;
|
||||
return t + (state->counter += 362437U);
|
||||
}
|
||||
|
||||
static void random_seed(rand_state_t* const state, const uint64_t salt, const uint8_t* const key, const size_t key_len)
|
||||
{
|
||||
random_init(state, hash_code(salt, 0x6B, key, key_len), hash_code(salt, 0x94, key, key_len));
|
||||
for (size_t i = 0U; i < 13U; ++i)
|
||||
{
|
||||
random_next(state);
|
||||
}
|
||||
}
|
||||
|
||||
// ==========================================================================
|
||||
// Initialization
|
||||
// ==========================================================================
|
||||
|
||||
static void initialize_state(crypt_state_t *const crypt_state, const uint64_t salt, const uint8_t *const key, const size_t key_len)
|
||||
{
|
||||
rand_state_t rand_state;
|
||||
for (size_t r = 0U; r < 256U; ++r)
|
||||
{
|
||||
random_seed(&rand_state, salt + r, key, key_len);
|
||||
crypt_state->off[r] = (uint8_t)random_next(&rand_state);
|
||||
for (size_t i = 0U; i < 256U; ++i)
|
||||
{
|
||||
const size_t j = random_next(&rand_state) % (i + 1U);
|
||||
if (j != i)
|
||||
{
|
||||
crypt_state->box[r][i] = crypt_state->box[r][j];
|
||||
}
|
||||
crypt_state->box[r][j] = (uint8_t)i;
|
||||
}
|
||||
for (size_t i = 0U; i < 256U; ++i)
|
||||
{
|
||||
const size_t j = crypt_state->box[r][i];
|
||||
crypt_state->inv[r][j] = (uint8_t)i;
|
||||
}
|
||||
}
|
||||
random_seed(&rand_state, salt + 9973U, key, key_len);
|
||||
crypt_state->pos = (uint8_t)random_next(&rand_state);
|
||||
erase(&rand_state, sizeof(rand_state_t));
|
||||
}
|
||||
|
||||
// ==========================================================================
|
||||
// Encrypt / Decrypt
|
||||
// ==========================================================================
|
||||
|
||||
static uint8_t process_enc(crypt_state_t* const crypt_state, uint8_t value)
|
||||
{
|
||||
for (size_t i = 0U; i < 256U; ++i)
|
||||
{
|
||||
value = crypt_state->box[i][(value + crypt_state->off[i]) & 0xFF];
|
||||
}
|
||||
++crypt_state->off[crypt_state->pos++];
|
||||
return value;
|
||||
}
|
||||
|
||||
static uint8_t process_dec(crypt_state_t* const crypt_state, uint8_t value)
|
||||
{
|
||||
size_t i = 256U;
|
||||
while(i--)
|
||||
{
|
||||
value = (crypt_state->inv[i][value] - crypt_state->off[i]) & 0xFF;
|
||||
}
|
||||
++crypt_state->off[crypt_state->pos++];
|
||||
return value;
|
||||
}
|
||||
|
||||
// ==========================================================================
|
||||
// Public API
|
||||
// ==========================================================================
|
||||
|
||||
int mcrypt_generate_seed(uint64_t *const seed)
|
||||
{
|
||||
if (seed)
|
||||
{
|
||||
return random_bytes((uint8_t*)seed, sizeof(uint64_t));
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
|
||||
mcrypt_t mcrypt_init(const uint64_t salt, const char* const passphrase)
|
||||
{
|
||||
if (!passphrase)
|
||||
{
|
||||
return ((mcrypt_t)NULL);
|
||||
}
|
||||
crypt_state_t *const state = (crypt_state_t*) malloc(sizeof(crypt_state_t));
|
||||
if (!state)
|
||||
{
|
||||
return ((mcrypt_t)NULL);
|
||||
}
|
||||
initialize_state(state, salt, (uint8_t*)passphrase, strlen(passphrase));
|
||||
return ((mcrypt_t)state);
|
||||
}
|
||||
|
||||
int mcrypt_enc_process(const mcrypt_t context, const uint8_t *const input, uint8_t *const output, size_t length)
|
||||
{
|
||||
crypt_state_t* const state = (crypt_state_t*)context;
|
||||
if (!context)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
for (size_t i = 0; i < length; ++i)
|
||||
{
|
||||
output[i] = process_enc(state, input[i]);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int mcrypt_enc_process_inplace(const mcrypt_t context, uint8_t* const buffer, size_t length)
|
||||
{
|
||||
crypt_state_t* const state = (crypt_state_t*)context;
|
||||
if (!context)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
for (size_t i = 0; i < length; ++i)
|
||||
{
|
||||
buffer[i] = process_enc(state, buffer[i]);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int mcrypt_dec_process(const mcrypt_t context, const uint8_t* const input, uint8_t* const output, size_t length)
|
||||
{
|
||||
crypt_state_t* const state = (crypt_state_t*)context;
|
||||
if (!context)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
for (size_t i = 0; i < length; ++i)
|
||||
{
|
||||
output[i] = process_dec(state, input[i]);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int mcrypt_dec_process_inplace(const mcrypt_t context, uint8_t* const buffer, size_t length)
|
||||
{
|
||||
crypt_state_t* const state = (crypt_state_t*)context;
|
||||
if (!context)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
for (size_t i = 0; i < length; ++i)
|
||||
{
|
||||
buffer[i] = process_dec(state, buffer[i]);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
void mcrypt_free(const mcrypt_t context)
|
||||
{
|
||||
crypt_state_t* const state = (crypt_state_t*)context;
|
||||
if (context)
|
||||
{
|
||||
erase((void*)context, sizeof(crypt_state_t));
|
||||
free((void*)context);
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,69 @@
|
|||
/******************************************************************************/
|
||||
/* MCrypt, by LoRd_MuldeR <MuldeR2@GMX.de> */
|
||||
/* This work has been released under the CC0 1.0 Universal license! */
|
||||
/******************************************************************************/
|
||||
|
||||
#include <mcrypt.h>
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
|
||||
int main()
|
||||
{
|
||||
printf("MCrypt Demo [%s]\n", __DATE__" "__TIME__);
|
||||
printf("Using libMCrypt v%s [%s]\n\n", LIBMCRYPT_VERSION, LIBMCRYPT_BUILD);
|
||||
|
||||
const char *const plaintext = "AAAALorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.";
|
||||
const size_t length = strlen(plaintext) + 1U;
|
||||
|
||||
fprintf(stderr, "\"%s\"\n\n", plaintext);
|
||||
|
||||
/* ---- Allocate buffers ---- */
|
||||
|
||||
char* ciphertext = malloc(length);
|
||||
if (!ciphertext)
|
||||
{
|
||||
abort();
|
||||
}
|
||||
|
||||
char* decoded = malloc(length);
|
||||
if (!decoded)
|
||||
{
|
||||
abort();
|
||||
}
|
||||
|
||||
/* ---- Generate seed ---- */
|
||||
|
||||
uint64_t seed;
|
||||
if (mcrypt_generate_seed(&seed) != 0)
|
||||
{
|
||||
abort();
|
||||
}
|
||||
|
||||
/* ---- Encryt message ---- */
|
||||
|
||||
mcrypt_t enc = mcrypt_init(seed, "Yp#QaQfH)t`DT23q");
|
||||
if (!enc)
|
||||
{
|
||||
abort();
|
||||
}
|
||||
|
||||
mcrypt_enc_process(enc, plaintext, ciphertext, length);
|
||||
mcrypt_free(enc);
|
||||
|
||||
fprintf(stderr, "\"%s\"\n\n", ciphertext);
|
||||
|
||||
|
||||
/* ---- Decryt message ---- */
|
||||
|
||||
mcrypt_t dec = mcrypt_init(seed, "Yp#QaQfH)t`DT23q");
|
||||
if (!dec)
|
||||
{
|
||||
abort();
|
||||
}
|
||||
|
||||
mcrypt_dec_process(dec, ciphertext, decoded, length);
|
||||
mcrypt_free(dec);
|
||||
|
||||
fprintf(stderr, "\"%s\"\n\n", decoded);
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue