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tests: add warning message when /dev/urandom fails 

in case this code should ever be used as an example, a warning is a nice
way of helping ensure insecure keys are not generated
This commit is contained in:
Don Viszneki 2018-03-05 18:43:31 -08:00
parent cd329dbc3e
commit cddef0c0be
1 changed files with 1 additions and 0 deletions
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src/tests.c
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@ -4919,6 +4919,7 @@ int main(int argc, char **argv) {
} else { } else {
FILE *frand = fopen("/dev/urandom", "r"); FILE *frand = fopen("/dev/urandom", "r");
if ((frand == NULL) || fread(&seed16, sizeof(seed16), 1, frand) != sizeof(seed16)) { if ((frand == NULL) || fread(&seed16, sizeof(seed16), 1, frand) != sizeof(seed16)) {
fprintf(stderr, "WARNING: could not read 16 bytes from /dev/urandom; falling back to insecure PRNG\n");
uint64_t t = time(NULL) * (uint64_t)1337; uint64_t t = time(NULL) * (uint64_t)1337;
seed16[0] ^= t; seed16[0] ^= t;
seed16[1] ^= t >> 8; seed16[1] ^= t >> 8;