Muldersoft/SlunkCrypt
Muldersoft/SlunkCrypt
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Revamped the stepping algorithm.

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This commit is contained in:
LoRd_MuldeR 2021-03-27 16:19:26 +01:00
parent bdab06cd80
commit 73f2e71342
Signed by: mulder
GPG Key ID: 2B5913365F57E03F
2 changed files with 36 additions and 28 deletions
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6
frontend/src/main.c
View File

@ -57,6 +57,8 @@ static const char PASSWD_SYMBOLS[] =
static const size_t RCMD_PWDLEN_LENGTH = 12U;
static const size_t DFLT_PWDLEN_LENGTH = 20U;
static const clock_t UPDATE_INTERVAL = (clock_t)(1.5708 * CLOCKS_PER_SEC);
static const uint64_t MAGIC_NUMBER = 0x243F6A8885A308D3ull;
// ==========================================================================
@ -349,7 +351,7 @@ static int encrypt(const char* const passphrase, const CHR* const input_path, co
{
break; /*EOF*/
}
if ((clk_now = clock()) - clk_update > CLOCKS_PER_SEC)
if ((clk_now = clock()) - clk_update > UPDATE_INTERVAL)
{
FPRINTF(stderr, T("\b\b\b\b\b\b\b%5.1f%% "), (bytes_read / ((double)file_size)) * 100.0);
fflush(stderr);
@ -521,7 +523,7 @@ static int decrypt(const char* const passphrase, const CHR* const input_path, co
{
break; /*EOF*/
}
if ((clk_now = clock()) - clk_update > CLOCKS_PER_SEC)
if ((clk_now = clock()) - clk_update > UPDATE_INTERVAL)
{
FPRINTF(stderr, T("\b\b\b\b\b\b\b%5.1f%% "), (bytes_read / ((double)read_limit)) * 100.0);
fflush(stderr);

58
libslunkcrypt/src/slunkcrypt.c
View File

@ -54,10 +54,10 @@ typedef struct
{
uint8_t wheel_fwd[256U][256U];
uint8_t wheel_bwd[256U][256U];
uint8_t step_fwd[256U];
uint8_t step_bwd[256U];
uint8_t rotation_fwd[2U][256U];
uint8_t rotation_bwd[2U][256U];
uint8_t step_fwd[247U];
uint8_t step_bwd[247U];
uint8_t rotation_fwd[256U];
uint8_t rotation_bwd[256U];
uint8_t counter;
}
crypt_state_t;
@ -230,8 +230,7 @@ static int initialize_state(crypt_state_t* const crypt_state, const uint64_t non
for (r = 0U; r < 256U; ++r)
{
random_seed(&rand_state, nonce, (uint16_t)r, passwd, passwd_len);
crypt_state->rotation_bwd[0U][255U - r] = crypt_state->rotation_fwd[0U][r] = (uint8_t)random_next(&rand_state);
crypt_state->rotation_bwd[1U][255U - r] = crypt_state->rotation_fwd[1U][r] = 0U;
crypt_state->rotation_bwd[255U - r] = crypt_state->rotation_fwd[r] = (uint8_t)random_next(&rand_state);
for (i = 0U; i < 256U; ++i)
{
const size_t j = random_next(&rand_state) % (i + 1U);
@ -251,7 +250,7 @@ static int initialize_state(crypt_state_t* const crypt_state, const uint64_t non
/* set up stepping */
random_seed(&rand_state, nonce, 256U, passwd, passwd_len);
for (i = 0U; i < 256U; ++i)
for (i = 0U; i < 247U; ++i)
{
const size_t j = random_next(&rand_state) % (i + 1U);
if (j != i)
@ -259,8 +258,8 @@ static int initialize_state(crypt_state_t* const crypt_state, const uint64_t non
crypt_state->step_fwd[i] = crypt_state->step_fwd[j];
crypt_state->step_bwd[i] = crypt_state->step_bwd[j];
}
crypt_state->step_fwd[j] = (uint8_t)i;
crypt_state->step_bwd[j] = (uint8_t)(255U - i);
crypt_state->step_fwd[j] = (uint8_t)( 6U + i);
crypt_state->step_bwd[j] = (uint8_t)(249U - i);
}
slunkcrypt_bzero(&rand_state, sizeof(rand_state_t));
@ -271,41 +270,48 @@ static int initialize_state(crypt_state_t* const crypt_state, const uint64_t non
// Encrypt / Decrypt
// ==========================================================================
static FORCE_INLINE void increment(uint8_t *const arr, const int rev)
static FORCE_INLINE void odometer_step(uint8_t *const arr, const int bwd)
{
size_t i;
for (i = 0U; i < 256U; ++i)
for (i = 0U; i < 6U; ++i)
{
if (++arr[rev ? (255U - i) : i] != 0U)
if (++arr[bwd ? (255U - i) : i] != 0U)
{
break;
}
}
for (i = 0U; i < 3U; ++i)
{
if (++arr[bwd ? i : (255U - i)] != 0U)
{
break;
}
}
}
static FORCE_INLINE uint8_t process_enc(crypt_state_t* const crypt_state, uint8_t value)
static FORCE_INLINE uint8_t process_encrypt(crypt_state_t* const crypt_state, uint8_t value)
{
size_t i;
for (i = 0U; i < 256U; ++i)
{
const uint8_t offset = crypt_state->rotation_fwd[0U][i] + crypt_state->rotation_fwd[1U][i];
value = crypt_state->wheel_fwd[i][(value + offset) & 0xFF];
value = crypt_state->wheel_fwd[i][(value + crypt_state->rotation_fwd[i]) & 0xFF];
}
++crypt_state->rotation_fwd[0U][crypt_state->step_fwd[crypt_state->counter++]];
increment(crypt_state->rotation_fwd[1U], 0);
++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) % 247U;
return value;
}
static FORCE_INLINE uint8_t process_dec(crypt_state_t* const crypt_state, uint8_t value)
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 offset = crypt_state->rotation_bwd[0U][i] + crypt_state->rotation_bwd[1U][i];
value = (crypt_state->wheel_bwd[i][value] - offset) & 0xFF;
value = (crypt_state->wheel_bwd[i][value] - crypt_state->rotation_bwd[i]) & 0xFF;
}
++crypt_state->rotation_bwd[0U][crypt_state->step_bwd[crypt_state->counter++]];
increment(crypt_state->rotation_bwd[1U], 1);
++crypt_state->rotation_bwd[crypt_state->step_bwd[crypt_state->counter]];
odometer_step(crypt_state->rotation_bwd, 1);
crypt_state->counter = (crypt_state->counter + 1U) % 247U;
return value;
}
@ -379,7 +385,7 @@ int slunkcrypt_encrypt(const slunkcrypt_t context, const uint8_t* const input, u
size_t i;
for (i = 0; i < length; ++i)
{
output[i] = process_enc(state, input[i]);
output[i] = process_encrypt(state, input[i]);
CHECK_ABORTED();
}
}
@ -398,7 +404,7 @@ int slunkcrypt_encrypt_inplace(const slunkcrypt_t context, uint8_t* const buffer
size_t i;
for (i = 0; i < length; ++i)
{
buffer[i] = process_enc(state, buffer[i]);
buffer[i] = process_encrypt(state, buffer[i]);
CHECK_ABORTED();
}
}
@ -418,7 +424,7 @@ int slunkcrypt_decrypt(const slunkcrypt_t context, const uint8_t* const input, u
size_t i;
for (i = 0; i < length; ++i)
{
output[i] = process_dec(state, input[i]);
output[i] = process_decrypt(state, input[i]);
CHECK_ABORTED();
}
}
@ -437,7 +443,7 @@ int slunkcrypt_decrypt_inplace(const slunkcrypt_t context, uint8_t* const buffer
size_t i;
for (i = 0; i < length; ++i)
{
buffer[i] = process_dec(state, buffer[i]);
buffer[i] = process_decrypt(state, buffer[i]);
CHECK_ABORTED();
}
}