Simplified crypt_state_t by merging separate fwd/bwd arrays.
This commit is contained in:
parent
471e08737b
commit
8ebf71ba73
GPG Key ID:
2B5913365F57E03F
@ -34,8 +34,11 @@ const char* const SLUNKCRYPT_BUILD = __DATE__ " " __TIME__;
|
||||
#define HASH_MAGIC_PRIME 0x00000100000001B3ull
|
||||
#define HASH_OFFSET_BASE 0xCBF29CE484222325ull
|
||||
|
||||
/* Utils */
|
||||
#define BOOLIFY(X) (!!(X))
|
||||
/* Types */
|
||||
typedef _Bool boolean;
|
||||
|
||||
/* Utilities */
|
||||
#define INT_TO_BOOL(X) ((boolean)(!(!(X))))
|
||||
#define LOGICAL_XOR(X,Y) ((Y) ? (!(X)) : (X))
|
||||
|
||||
// ==========================================================================
|
||||
@ -52,17 +55,14 @@ typedef struct
|
||||
{
|
||||
uint32_t x, y, z, w, v, d;
|
||||
}
|
||||
rand_state_t;
|
||||
xorsh_state_t;
|
||||
|
||||
typedef struct
|
||||
{
|
||||
uint8_t reverse_mode;
|
||||
uint8_t wheel_fwd[256U][256U];
|
||||
uint8_t wheel_bwd[256U][256U];
|
||||
uint8_t step_fwd[241U];
|
||||
uint8_t step_bwd[241U];
|
||||
uint8_t rotation_fwd[256U];
|
||||
uint8_t rotation_bwd[256U];
|
||||
boolean reverse_mode;
|
||||
uint8_t wheel[256U][256U];
|
||||
uint8_t step[241U];
|
||||
uint8_t rotation[256U];
|
||||
uint8_t counter;
|
||||
}
|
||||
crypt_state_t;
|
||||
@ -77,7 +77,7 @@ volatile int g_slunkcrypt_abort_flag = 0;
|
||||
{ \
|
||||
if (g_slunkcrypt_abort_flag) \
|
||||
{ \
|
||||
return SLUNKCRYPT_ABORTED; \
|
||||
goto abort_request; \
|
||||
} \
|
||||
} \
|
||||
while (0)
|
||||
@ -179,12 +179,12 @@ static void generate_key(key_data_t *const key, const uint64_t salt, const uint1
|
||||
}
|
||||
|
||||
// ==========================================================================
|
||||
// PRNG
|
||||
// Deterministic random bit generator
|
||||
// ==========================================================================
|
||||
|
||||
static void random_init(rand_state_t *const state, const key_data_t *const key)
|
||||
static void random_init(xorsh_state_t *const state, const key_data_t *const key)
|
||||
{
|
||||
slunkcrypt_bzero(state, sizeof(rand_state_t));
|
||||
slunkcrypt_bzero(state, sizeof(xorsh_state_t));
|
||||
state->x = lower_u64(key->a);
|
||||
state->y = upper_u64(key->a);
|
||||
state->z = lower_u64(key->b);
|
||||
@ -193,7 +193,7 @@ static void random_init(rand_state_t *const state, const key_data_t *const key)
|
||||
state->d = upper_u64(key->c);
|
||||
}
|
||||
|
||||
static uint32_t random_next(rand_state_t *const state)
|
||||
static uint32_t random_next(xorsh_state_t *const state)
|
||||
{
|
||||
const uint32_t t = state->x ^ (state->x >> 2);
|
||||
state->x = state->y;
|
||||
@ -204,7 +204,7 @@ static uint32_t random_next(rand_state_t *const state)
|
||||
return (state->d += 0x000587C5) + state->v;
|
||||
}
|
||||
|
||||
static void random_seed(rand_state_t *const state, uint64_t salt, const uint16_t pepper, const uint8_t *const passwd, const size_t passwd_len)
|
||||
static void random_seed(xorsh_state_t *const state, uint64_t salt, const uint16_t pepper, const uint8_t *const passwd, const size_t passwd_len)
|
||||
{
|
||||
size_t i;
|
||||
key_data_t key;
|
||||
@ -225,33 +225,48 @@ static void random_seed(rand_state_t *const state, uint64_t salt, const uint16_t
|
||||
// Initialization
|
||||
// ==========================================================================
|
||||
|
||||
static int initialize_state(crypt_state_t *const crypt_state, const uint64_t nonce, const uint8_t *const passwd, const size_t passwd_len, const int reverse)
|
||||
static int initialize_state(crypt_state_t *const crypt_state, const uint64_t nonce, const uint8_t *const passwd, const size_t passwd_len, const int mode)
|
||||
{
|
||||
rand_state_t rand_state;
|
||||
xorsh_state_t rand_state;
|
||||
uint8_t temp[256U][256U];
|
||||
size_t r, i;
|
||||
|
||||
/* initialize state */
|
||||
slunkcrypt_bzero(crypt_state, sizeof(crypt_state_t));
|
||||
crypt_state->reverse_mode = BOOLIFY(reverse);
|
||||
const boolean reverse = crypt_state->reverse_mode = INT_TO_BOOL(mode);
|
||||
|
||||
/* set up wheels and initial rotation */
|
||||
for (r = 0U; r < 256U; ++r)
|
||||
{
|
||||
random_seed(&rand_state, nonce, (uint16_t)r, passwd, passwd_len);
|
||||
crypt_state->rotation_bwd[255U - r] = crypt_state->rotation_fwd[r] = (uint8_t)random_next(&rand_state);
|
||||
crypt_state->rotation[reverse ? (255U - r) : r] = (uint8_t)random_next(&rand_state);
|
||||
for (i = 0U; i < 256U; ++i)
|
||||
{
|
||||
const size_t j = random_next(&rand_state) % (i + 1U);
|
||||
if (j != i)
|
||||
{
|
||||
crypt_state->wheel_fwd[r][i] = crypt_state->wheel_fwd[r][j];
|
||||
crypt_state->wheel[r][i] = crypt_state->wheel[r][j];
|
||||
}
|
||||
crypt_state->wheel_fwd[r][j] = (uint8_t)i;
|
||||
crypt_state->wheel[r][j] = (uint8_t)i;
|
||||
}
|
||||
CHECK_ABORTED();
|
||||
}
|
||||
|
||||
/* reverse the wheels, if requested */
|
||||
if (reverse)
|
||||
{
|
||||
for (r = 0U; r < 256U; ++r)
|
||||
{
|
||||
for (i = 0U; i < 256U; ++i)
|
||||
{
|
||||
crypt_state->wheel_bwd[255U - r][crypt_state->wheel_fwd[r][i]] = (uint8_t)i;
|
||||
temp[r][crypt_state->wheel[r][i]] = (uint8_t)i;
|
||||
}
|
||||
}
|
||||
for (r = 0U; r < 256U; ++r)
|
||||
{
|
||||
memcpy(crypt_state->wheel[255U - r], temp[r], 256U);
|
||||
}
|
||||
slunkcrypt_bzero(temp, sizeof(temp));
|
||||
CHECK_ABORTED();
|
||||
}
|
||||
|
||||
@ -262,67 +277,59 @@ static int initialize_state(crypt_state_t *const crypt_state, const uint64_t non
|
||||
const size_t j = random_next(&rand_state) % (i + 1U);
|
||||
if (j != i)
|
||||
{
|
||||
crypt_state->step_fwd[i] = crypt_state->step_fwd[j];
|
||||
crypt_state->step_bwd[i] = crypt_state->step_bwd[j];
|
||||
crypt_state->step[i] = crypt_state->step[j];
|
||||
}
|
||||
crypt_state->step_fwd[j] = (uint8_t)( 6U + i);
|
||||
crypt_state->step_bwd[j] = (uint8_t)(249U - i);
|
||||
crypt_state->step[j] = (uint8_t)(reverse ? (249U - i) : (6U + i));
|
||||
}
|
||||
|
||||
/* final clean-up */
|
||||
slunkcrypt_bzero(&rand_state, sizeof(rand_state_t));
|
||||
slunkcrypt_bzero(&rand_state, sizeof(xorsh_state_t));
|
||||
return SLUNKCRYPT_SUCCESS;
|
||||
|
||||
/* user abort request */
|
||||
abort_request:
|
||||
slunkcrypt_bzero(&rand_state, sizeof(xorsh_state_t));
|
||||
slunkcrypt_bzero(crypt_state, sizeof(crypt_state_t));
|
||||
return SLUNKCRYPT_ABORTED;
|
||||
}
|
||||
|
||||
// ==========================================================================
|
||||
// Encrypt / Decrypt
|
||||
// ==========================================================================
|
||||
|
||||
static FORCE_INLINE void increment(uint8_t *const arr, const size_t offset, const size_t limit, const int bwd)
|
||||
static FORCE_INLINE void increment(uint8_t *const arr, const size_t offset, const size_t limit, const boolean reverse)
|
||||
{
|
||||
size_t i;
|
||||
for (i = offset; i < limit; ++i)
|
||||
{
|
||||
if (++arr[bwd ? (255U - i) : i] != 0U)
|
||||
if (++arr[reverse ? (255U - i) : i] != 0U)
|
||||
{
|
||||
break; /*no carry*/
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static FORCE_INLINE void odometer_step(uint8_t *const arr, const int bwd)
|
||||
static FORCE_INLINE void odometer_step(uint8_t *const arr, const boolean reverse)
|
||||
{
|
||||
increment(arr, 0U, 6U, LOGICAL_XOR(bwd, 0));
|
||||
increment(arr, 0U, 3U, LOGICAL_XOR(bwd, 1));
|
||||
increment(arr, 3U, 6U, LOGICAL_XOR(bwd, 1));
|
||||
increment(arr, 6U, 9U, LOGICAL_XOR(bwd, 1));
|
||||
increment(arr, 0U, 6U, LOGICAL_XOR(reverse, 0));
|
||||
increment(arr, 0U, 3U, LOGICAL_XOR(reverse, 1));
|
||||
increment(arr, 3U, 6U, LOGICAL_XOR(reverse, 1));
|
||||
increment(arr, 6U, 9U, LOGICAL_XOR(reverse, 1));
|
||||
}
|
||||
|
||||
static FORCE_INLINE uint8_t process_encrypt(crypt_state_t *const crypt_state, uint8_t value)
|
||||
static FORCE_INLINE uint8_t process_next_symbol(crypt_state_t *const crypt_state, uint8_t value)
|
||||
{
|
||||
size_t i;
|
||||
for (i = 0U; i < 256U; ++i)
|
||||
{
|
||||
const uint8_t rotation = crypt_state->rotation_fwd[i];
|
||||
value = (crypt_state->wheel_fwd[i][(value + rotation) & 0xFF] - rotation) & 0xFF;
|
||||
}
|
||||
++crypt_state->rotation_fwd[crypt_state->step_fwd[crypt_state->counter]];
|
||||
odometer_step(crypt_state->rotation_fwd, 0);
|
||||
crypt_state->counter = (crypt_state->counter + 1U) % 241U;
|
||||
return value;
|
||||
const uint8_t offset = crypt_state->rotation[i];
|
||||
value = (crypt_state->wheel[i][(value + offset) & 0xFF] - offset) & 0xFF;
|
||||
}
|
||||
|
||||
static FORCE_INLINE uint8_t process_decrypt(crypt_state_t *const crypt_state, uint8_t value)
|
||||
{
|
||||
size_t i;
|
||||
for (i = 0U; i < 256U; ++i)
|
||||
{
|
||||
const uint8_t rotation = crypt_state->rotation_bwd[i];
|
||||
value = (crypt_state->wheel_bwd[i][(value + rotation) & 0xFF] - rotation) & 0xFF;
|
||||
}
|
||||
++crypt_state->rotation_bwd[crypt_state->step_bwd[crypt_state->counter]];
|
||||
odometer_step(crypt_state->rotation_bwd, 1);
|
||||
++crypt_state->rotation[crypt_state->step[crypt_state->counter]];
|
||||
crypt_state->counter = (crypt_state->counter + 1U) % 241U;
|
||||
odometer_step(crypt_state->rotation, crypt_state->reverse_mode);
|
||||
|
||||
return value;
|
||||
}
|
||||
|
||||
@ -391,16 +398,22 @@ int slunkcrypt_process(const slunkcrypt_t context, const uint8_t* const input, u
|
||||
{
|
||||
return SLUNKCRYPT_FAILURE;
|
||||
}
|
||||
|
||||
if (length > 0U)
|
||||
{
|
||||
size_t i;
|
||||
for (i = 0; i < length; ++i)
|
||||
{
|
||||
output[i] = state->reverse_mode ? process_decrypt(state, input[i]) : process_encrypt(state, input[i]);
|
||||
output[i] = process_next_symbol(state, input[i]);
|
||||
CHECK_ABORTED();
|
||||
}
|
||||
}
|
||||
|
||||
return SLUNKCRYPT_SUCCESS;
|
||||
|
||||
abort_request:
|
||||
slunkcrypt_bzero(state, sizeof(crypt_state_t));
|
||||
return SLUNKCRYPT_ABORTED;
|
||||
}
|
||||
|
||||
int slunkcrypt_process_inplace(const slunkcrypt_t context, uint8_t *const buffer, size_t length)
|
||||
@ -410,16 +423,22 @@ int slunkcrypt_process_inplace(const slunkcrypt_t context, uint8_t* const buffer
|
||||
{
|
||||
return SLUNKCRYPT_FAILURE;
|
||||
}
|
||||
|
||||
if (length > 0U)
|
||||
{
|
||||
size_t i;
|
||||
for (i = 0; i < length; ++i)
|
||||
{
|
||||
buffer[i] = state->reverse_mode ? process_decrypt(state, buffer[i]) : process_encrypt(state, buffer[i]);
|
||||
buffer[i] = process_next_symbol(state, buffer[i]);
|
||||
CHECK_ABORTED();
|
||||
}
|
||||
}
|
||||
|
||||
return SLUNKCRYPT_SUCCESS;
|
||||
|
||||
abort_request:
|
||||
slunkcrypt_bzero(state, sizeof(crypt_state_t));
|
||||
return SLUNKCRYPT_ABORTED;
|
||||
}
|
||||
|
||||
void slunkcrypt_free(const slunkcrypt_t context)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user