62 static int csprng_reseed(struct csprng_state *state);
80 csprng_init(struct csprng_state *state)  in csprng_init()  argument
84           bzero(state->key, sizeof(state->key));  in csprng_init()
85           bzero(&state->cipher_ctx, sizeof(state->cipher_ctx));  in csprng_init()
86           bzero(state->src_pool_idx, sizeof(state->src_pool_idx));  in csprng_init()
87           bzero(&state->last_reseed, sizeof(state->last_reseed));  in csprng_init()
89           state->reseed_cnt = 0;  in csprng_init()
90           state->failed_reseeds = 0;  in csprng_init()
91           state->callout_based_reseed = 0;  in csprng_init()
94                     r = csprng_pool_init(&state->pool[i], NULL, 0);  in csprng_init()
104 csprng_init_reseed(struct csprng_state *state)
106           state->callout_based_reseed = 1;
108           callout_init_mp(&state->reseed_callout);
109           callout_reset(&state->reseed_callout, MIN_RESEED_INTERVAL,
110                           csprng_reseed_callout, state);
127 csprng_get_random(struct csprng_state *state, uint8_t *out, int bytes,  in csprng_get_random()  argument
134           if (!state->callout_based_reseed &&  in csprng_get_random()
135                ratecheck(&state->last_reseed, &csprng_reseed_interval)) {  in csprng_get_random()
136                     csprng_reseed(state);  in csprng_get_random()
146           if ((flags & CSPRNG_UNLIMITED) == 0 && state->reseed_cnt == 0) {  in csprng_get_random()
147                     ssleep(state, &state->spin, 0, "csprngrsd", 0);  in csprng_get_random()
155                     chacha_encrypt_bytes(&state->cipher_ctx, NULL, out, cnt);  in csprng_get_random()
158                     chacha_encrypt_bytes(&state->cipher_ctx, NULL, state->key,  in csprng_get_random()
159                                              sizeof(state->key));  in csprng_get_random()
160                     chacha_keysetup(&state->cipher_ctx, state->key,  in csprng_get_random()
161                                         8 * sizeof(state->key));  in csprng_get_random()
176 csprng_reseed(struct csprng_state *state)  in csprng_reseed()  argument
188           if (state->pool[0].bytes < MIN_POOL_SIZE) {  in csprng_reseed()
189                     ++state->failed_reseeds;  in csprng_reseed()
199           SHA256_Update(&hash_ctx, state->key, sizeof(state->key));  in csprng_reseed()
201           state->reseed_cnt++;  in csprng_reseed()
204                     if ((state->reseed_cnt % (1 << i)) != 0)  in csprng_reseed()
207                     pool = &state->pool[i];  in csprng_reseed()
228           SHA256_Final(state->key, &hash_ctx);  in csprng_reseed()
231           chacha_keysetup(&state->cipher_ctx, state->key, 8*sizeof(state->key));  in csprng_reseed()
235           chacha_ivsetup(&state->cipher_ctx, NULL, counter);  in csprng_reseed()
245           struct csprng_state *state = (struct csprng_state *)arg;
248           spin_lock(&state->spin);
250           spin_unlock(&state->spin);
251           wakeup(state);
253           callout_reset(&state->reseed_callout, reseed_interval,
254                           csprng_reseed_callout, state);
262 csprng_add_entropy(struct csprng_state *state, int src_id,  in csprng_add_entropy()  argument
273           pool_id = state->src_pool_idx[src_id]++ & 0x1f;  in csprng_add_entropy()
274           pool = &state->pool[pool_id];  in csprng_add_entropy()