+void BN_GENCB_free(BN_GENCB *cb) {
+ free(cb);
+}
+#endif
+
+rsa_t *rsa_generate(size_t bits, unsigned long exponent) {
+ BIGNUM *bn_e = BN_new();
+ rsa_t *rsa = RSA_new();
+ BN_GENCB *cb = BN_GENCB_new();
+
+ if(!bn_e || !rsa || !cb)
+ abort();
+
+ BN_set_word(bn_e, exponent);
+ BN_GENCB_set(cb, indicator, NULL);
+
+ int result = RSA_generate_key_ex(rsa, bits, bn_e, cb);
+
+ BN_GENCB_free(cb);
+ BN_free(bn_e);
+
+ if(!result) {
+ fprintf(stderr, "Error during key generation!\n");
+ RSA_free(rsa);
+ return NULL;
+ }
+
+ return rsa;