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Differential D7662 Diff 24020 src/secp256k1/src/testrand_impl.h

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src/secp256k1/src/testrand_impl.h

/********************************************************************** /**********************************************************************
* Copyright (c) 2013-2015 Pieter Wuille * * Copyright (c) 2013-2015 Pieter Wuille *
* Distributed under the MIT software license, see the accompanying * * Distributed under the MIT software license, see the accompanying *
* file COPYING or http://www.opensource.org/licenses/mit-license.php.* * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
**********************************************************************/ **********************************************************************/
#ifndef SECP256K1_TESTRAND_IMPL_H #ifndef SECP256K1_TESTRAND_IMPL_H
#define SECP256K1_TESTRAND_IMPL_H #define SECP256K1_TESTRAND_IMPL_H
#include <stdint.h> #include <stdint.h>
#include <stdio.h>
#include <string.h> #include <string.h>
#include "testrand.h" #include "testrand.h"
#include "hash.h" #include "hash.h"
static secp256k1_rfc6979_hmac_sha256 secp256k1_test_rng; static secp256k1_rfc6979_hmac_sha256 secp256k1_test_rng;
static uint32_t secp256k1_test_rng_precomputed[8]; static uint32_t secp256k1_test_rng_precomputed[8];
static int secp256k1_test_rng_precomputed_used = 8; static int secp256k1_test_rng_precomputed_used = 8;
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static void secp256k1_rand256_test(unsigned char *b32) { static void secp256k1_rand256_test(unsigned char *b32) {
secp256k1_rand_bytes_test(b32, 32); secp256k1_rand_bytes_test(b32, 32);
} }
static void secp256k1_rand_flip(unsigned char *b, size_t len) { static void secp256k1_rand_flip(unsigned char *b, size_t len) {
b[secp256k1_rand_int(len)] ^= (1 << secp256k1_rand_int(8)); b[secp256k1_rand_int(len)] ^= (1 << secp256k1_rand_int(8));
} }
static void secp256k1_rand_init(const char* hexseed) {
unsigned char seed16[16] = {0};
if (hexseed) {
int pos = 0;
while (pos < 16 && hexseed[0] != 0 && hexseed[1] != 0) {
unsigned short sh;
if ((sscanf(hexseed, "%2hx", &sh)) == 1) {
seed16[pos] = sh;
} else {
break;
}
hexseed += 2;
pos++;
}
} else {
FILE *frand = fopen("/dev/urandom", "r");
if ((frand == NULL) || fread(&seed16, 1, sizeof(seed16), frand) != sizeof(seed16)) {
uint64_t t = time(NULL) * (uint64_t)1337;
fprintf(stderr, "WARNING: could not read 16 bytes from /dev/urandom; falling back to insecure PRNG\n");
seed16[0] ^= t;
seed16[1] ^= t >> 8;
seed16[2] ^= t >> 16;
seed16[3] ^= t >> 24;
seed16[4] ^= t >> 32;
seed16[5] ^= t >> 40;
seed16[6] ^= t >> 48;
seed16[7] ^= t >> 56;
}
if (frand) {
fclose(frand);
}
}
printf("random seed = %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n", seed16[0], seed16[1], seed16[2], seed16[3], seed16[4], seed16[5], seed16[6], seed16[7], seed16[8], seed16[9], seed16[10], seed16[11], seed16[12], seed16[13], seed16[14], seed16[15]);
secp256k1_rand_seed(seed16);
}
static void secp256k1_rand_finish(void) {
unsigned char run32[32];
secp256k1_rand256(run32);
printf("random run = %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n", run32[0], run32[1], run32[2], run32[3], run32[4], run32[5], run32[6], run32[7], run32[8], run32[9], run32[10], run32[11], run32[12], run32[13], run32[14], run32[15]);
}
#endif /* SECP256K1_TESTRAND_IMPL_H */ #endif /* SECP256K1_TESTRAND_IMPL_H */