int RAND_init_fips(void)
{
DRBG_CTX *dctx;
size_t plen;
unsigned char pers[32], *p;
dctx = FIPS_get_default_drbg();
if (FIPS_drbg_init(dctx, fips_drbg_type, fips_drbg_flags) <= 0)
{
RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INITIALISING_DRBG);
return 0;
}
FIPS_drbg_set_callbacks(dctx,
drbg_get_entropy, drbg_free_entropy, 20,
drbg_get_entropy, drbg_free_entropy);
FIPS_drbg_set_rand_callbacks(dctx, drbg_get_adin, 0,
drbg_rand_seed, drbg_rand_add);
/* Personalisation string: a string followed by date time vector */
strcpy((char *)pers, "OpenSSL DRBG2.0");
plen = drbg_get_adin(dctx, &p);
memcpy(pers + 16, p, plen);
if (FIPS_drbg_instantiate(dctx, pers, sizeof(pers)) <= 0)
{
RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INSTANTIATING_DRBG);
return 0;
}
FIPS_rand_set_method(FIPS_drbg_method());
return 1;
}
int FIPS_rand_set_method(const RAND_METHOD *meth)
{
if (!fips_rand_bits) {
if (meth == FIPS_drbg_method())
fips_approved_rand_meth = 1;
else if (meth == FIPS_x931_method())
fips_approved_rand_meth = 2;
else {
fips_approved_rand_meth = 0;
if (FIPS_module_mode()) {
FIPSerr(FIPS_F_FIPS_RAND_SET_METHOD, FIPS_R_NON_FIPS_METHOD);
return 0;
}
}
}
fips_rand_meth = meth;
return 1;
}