RSA_F4
f4 = RSA_F4;
unsigned long f4 = RSA_F4;
&& BN_set_word(bn, RSA_F4)
if (rctx->pub_exp == NULL || !BN_set_word(rctx->pub_exp, RSA_F4))
|| !BN_set_word(gctx->pub_exp, RSA_F4)) {
&& TEST_int_eq(BN_set_word(e, RSA_F4), 1)