BN_get0_nist_prime_192
if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
const BIGNUM *BN_get0_nist_prime_192(void);
BN_ucmp(BN_get0_nist_prime_192(), other_p) == 0 ? BN_get0_nist_prime_256() : BN_get0_nist_prime_192())))