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use xor mixing in pubkey mining

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Signed-off-by: William Casarin <jb55@jb55.com>
This commit is contained in:
William Casarin 2022-08-30 08:09:30 -07:00
parent 250a5edbb3
commit 5dd60cfb26
1 changed files with 20 additions and 8 deletions
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28
nostril.c
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@ -240,8 +240,20 @@ static int decode_key(secp256k1_context *ctx, const char *secstr, struct key *ke
return create_key(ctx, key);
}
static inline void xor_mix(unsigned char *dest, const unsigned char *a, const unsigned char *b, int size)
{
int i;
for (i = 0; i < size; i++)
dest[i] = a[i] ^ b[i];
}
static int generate_key(secp256k1_context *ctx, struct key *key, int *difficulty)
{
uint64_t attempts = 0;
uint64_t duration;
double pers;
struct timespec t1, t2;
/* If the secret key is zero or out of range (bigger than secp256k1's
* order), we try to sample a new key. Note that the probability of this
* happening is negligible. */
@ -253,16 +265,8 @@ static int generate_key(secp256k1_context *ctx, struct key *key, int *difficulty
return create_key(ctx, key);
}
uint64_t attempts = 0;
uint64_t duration;
double pers;
struct timespec t1, t2;
clock_gettime(CLOCK_MONOTONIC, &t1);
while (1) {
if (!fill_random(key->secret, sizeof(key->secret)))
continue;
if (!create_key(ctx, key))
return 0;
@ -275,6 +279,14 @@ static int generate_key(secp256k1_context *ctx, struct key *key, int *difficulty
fprintf(stderr, "mined pubkey after %" PRIu64 " attempts, %" PRId64 " ms, %f attempts per ms\n", attempts, duration, pers);
return 1;
}
// NOTE: Get a new secret key by xor mixing the current secret
// key with the current public key. This doesn't rely on the
// system's crypto number generator so it should be fast. There
// shouldn't be any secret key entropy issues since we got a
// good source of entropy from the first fill_random call at
// the start of the function.
xor_mix(key->secret, key->secret, key->pubkey, 32);
}
}