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added validate_prng_nonce from iceman1001 fork

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merlokk 2017-11-01 16:18:13 +02:00
commit 3d81da6d1a
2 changed files with 13 additions and 0 deletions
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11
common/crapto1/crapto1.c
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@ -426,6 +426,17 @@ int nonce_distance(uint32_t from, uint32_t to)
return (65535 + dist[to >> 16] - dist[from >> 16]) % 65535;
}
/** validate_prng_nonce
* Determine if nonce is deterministic. ie: Suspectable to Darkside attack.
* returns
* true = weak prng
* false = hardend prng
*/
bool validate_prng_nonce(uint32_t nonce) {
// init prng table:
nonce_distance(nonce, nonce);
return ((65535 - dist[nonce >> 16] + dist[nonce & 0xffff]) % 65535) == 16;
}
static uint32_t fastfwd[2][8] = {
{ 0, 0x4BC53, 0xECB1, 0x450E2, 0x25E29, 0x6E27A, 0x2B298, 0x60ECB},

2
common/crapto1/crapto1.h
View file

@ -20,6 +20,7 @@
#ifndef CRAPTO1_INCLUDED
#define CRAPTO1_INCLUDED
#include <stdint.h>
#include <stdbool.h>
#ifdef __cplusplus
extern "C" {
#endif
@ -48,6 +49,7 @@ uint8_t lfsr_rollback_bit(struct Crypto1State* s, uint32_t in, int fb);
uint8_t lfsr_rollback_byte(struct Crypto1State* s, uint32_t in, int fb);
uint32_t lfsr_rollback_word(struct Crypto1State* s, uint32_t in, int fb);
int nonce_distance(uint32_t from, uint32_t to);
extern bool validate_prng_nonce(uint32_t nonce);
#define FOREACH_VALID_NONCE(N, FILTER, FSIZE)\
uint32_t __n = 0,__M = 0, N = 0;\
int __i;\