-DH *DH_generate_parameters(int prime_len, int generator,
- void (*callback)(P_I_I_P), char *cb_arg)
- {
- BIGNUM *p=NULL,*t1,*t2;
- DH *ret=NULL;
- int g,ok= -1;
- BN_CTX *ctx=NULL;
+ if (generator <= 1) {
+ DHerr(DH_F_DH_BUILTIN_GENPARAMS, DH_R_BAD_GENERATOR);
+ goto err;
+ }
+ if (generator == DH_GENERATOR_2) {
+ if (!BN_set_word(t1, 24))
+ goto err;
+ if (!BN_set_word(t2, 11))
+ goto err;
+ g = 2;
+ } else if (generator == DH_GENERATOR_5) {
+ if (!BN_set_word(t1, 10))
+ goto err;
+ if (!BN_set_word(t2, 3))
+ goto err;
+ /*
+ * BN_set_word(t3,7); just have to miss out on these ones :-(
+ */
+ g = 5;
+ } else {
+ /*
+ * in the general case, don't worry if 'generator' is a generator or
+ * not: since we are using safe primes, it will generate either an
+ * order-q or an order-2q group, which both is OK
+ */
+ if (!BN_set_word(t1, 2))
+ goto err;
+ if (!BN_set_word(t2, 1))
+ goto err;
+ g = generator;
+ }