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Use more bytes of seed for gmp_randseed, do not use gmp_randseed_ui because it is always only 32-bits of entropy #5

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Use more bytes of seed for gmp_randseed, do not use gmp_randseed_ui because it is always only 32-bits of entropy #5

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11 changes: 8 additions & 3 deletions etlp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
#define DEF_TESTIME 1 /* seconds */
#define SQUARES_PER_CICLE 1000UL /* squares to do each cicle */
#define PRIME_LEN 512 /* prime bit length */
#define ENTROPY_BYTES (PRIME_LEN/2) /* amount of bytes to read from /dev/urandom */
#define BASE16 16
#define BASE10 10

Expand Down Expand Up @@ -40,14 +41,18 @@ setup(void)

/* Setup gmp random generator */
FILE *fp;
unsigned long int random_seed;
unsigned char random_bytes[ENTROPY_BYTES];

fp = fopen("/dev/urandom", "r");
fscanf(fp, "%lu", &random_seed);
fread(random_bytes, sizeof(unsigned char), ENTROPY_BYTES, fp);
fclose(fp);

mpz_t random_seed;
mpz_init(random_seed);
mpz_import(random_seed, ENTROPY_BYTES, 1, sizeof(unsigned char), 0, 0, random_bytes);

gmp_randinit_default(random_gen);
gmp_randseed_ui(random_gen, random_seed);
gmp_randseed(random_gen, random_seed);
}

/* Obtain the modulus n and fi(n) by creating two big random primes values
Expand Down