+/*
+ * Initialize the OPENSSL_CTX global DRBGs on first use.
+ * Returns the allocated global data on success or NULL on failure.
+ */
+static void *drbg_ossl_ctx_new(OPENSSL_CTX *libctx)
+{
+ DRBG_GLOBAL *dgbl = OPENSSL_zalloc(sizeof(*dgbl));
+
+ if (dgbl == NULL)
+ return NULL;
+
+#ifndef FIPS_MODULE
+ /*
+ * We need to ensure that base libcrypto thread handling has been
+ * initialised.
+ */
+ OPENSSL_init_crypto(0, NULL);
+#endif
+
+ if (!CRYPTO_THREAD_init_local(&dgbl->private_drbg, NULL))
+ goto err1;
+
+ if (!CRYPTO_THREAD_init_local(&dgbl->public_drbg, NULL))
+ goto err2;
+
+ dgbl->master_drbg = drbg_setup(libctx, NULL, RAND_DRBG_TYPE_MASTER);
+ if (dgbl->master_drbg == NULL)
+ goto err3;
+
+ return dgbl;
+
+ err3:
+ CRYPTO_THREAD_cleanup_local(&dgbl->public_drbg);
+ err2:
+ CRYPTO_THREAD_cleanup_local(&dgbl->private_drbg);
+ err1:
+ OPENSSL_free(dgbl);
+ return NULL;
+}
+
+static void drbg_ossl_ctx_free(void *vdgbl)
+{
+ DRBG_GLOBAL *dgbl = vdgbl;
+
+ if (dgbl == NULL)
+ return;
+
+ RAND_DRBG_free(dgbl->master_drbg);
+ CRYPTO_THREAD_cleanup_local(&dgbl->private_drbg);
+ CRYPTO_THREAD_cleanup_local(&dgbl->public_drbg);
+
+ OPENSSL_free(dgbl);
+}
+
+static const OPENSSL_CTX_METHOD drbg_ossl_ctx_method = {
+ drbg_ossl_ctx_new,
+ drbg_ossl_ctx_free,
+};
+
+/*
+ * drbg_ossl_ctx_new() calls drgb_setup() which calls rand_drbg_get_nonce()
+ * which needs to get the rand_nonce_lock out of the OPENSSL_CTX...but since
+ * drbg_ossl_ctx_new() hasn't finished running yet we need the rand_nonce_lock
+ * to be in a different global data object. Otherwise we will go into an
+ * infinite recursion loop.
+ */
+static void *drbg_nonce_ossl_ctx_new(OPENSSL_CTX *libctx)
+{
+ DRBG_NONCE_GLOBAL *dngbl = OPENSSL_zalloc(sizeof(*dngbl));
+
+ if (dngbl == NULL)
+ return NULL;
+
+ dngbl->rand_nonce_lock = CRYPTO_THREAD_lock_new();
+ if (dngbl->rand_nonce_lock == NULL) {
+ OPENSSL_free(dngbl);
+ return NULL;
+ }
+
+ return dngbl;
+}
+
+static void drbg_nonce_ossl_ctx_free(void *vdngbl)
+{
+ DRBG_NONCE_GLOBAL *dngbl = vdngbl;
+
+ if (dngbl == NULL)
+ return;
+
+ CRYPTO_THREAD_lock_free(dngbl->rand_nonce_lock);
+
+ OPENSSL_free(dngbl);
+}
+
+static const OPENSSL_CTX_METHOD drbg_nonce_ossl_ctx_method = {
+ drbg_nonce_ossl_ctx_new,
+ drbg_nonce_ossl_ctx_free,
+};
+
+static DRBG_GLOBAL *drbg_get_global(OPENSSL_CTX *libctx)
+{
+ return openssl_ctx_get_data(libctx, OPENSSL_CTX_DRBG_INDEX,
+ &drbg_ossl_ctx_method);
+}
+
+/* Implements the get_nonce() callback (see RAND_DRBG_set_callbacks()) */
+size_t rand_drbg_get_nonce(RAND_DRBG *drbg,
+ unsigned char **pout,
+ int entropy, size_t min_len, size_t max_len)
+{
+ size_t ret = 0;
+ RAND_POOL *pool;
+ DRBG_NONCE_GLOBAL *dngbl
+ = openssl_ctx_get_data(drbg->libctx, OPENSSL_CTX_DRBG_NONCE_INDEX,
+ &drbg_nonce_ossl_ctx_method);
+ struct {
+ void *instance;
+ int count;
+ } data;
+
+ if (dngbl == NULL)
+ return 0;
+
+ memset(&data, 0, sizeof(data));
+ pool = rand_pool_new(0, 0, min_len, max_len);
+ if (pool == NULL)
+ return 0;
+
+ if (rand_pool_add_nonce_data(pool) == 0)
+ goto err;
+
+ data.instance = drbg;
+ CRYPTO_atomic_add(&dngbl->rand_nonce_count, 1, &data.count,
+ dngbl->rand_nonce_lock);
+
+ if (rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0) == 0)
+ goto err;
+
+ ret = rand_pool_length(pool);
+ *pout = rand_pool_detach(pool);
+
+ err:
+ rand_pool_free(pool);
+
+ return ret;
+}
+
+/*
+ * Implements the cleanup_nonce() callback (see RAND_DRBG_set_callbacks())
+ *
+ */
+void rand_drbg_cleanup_nonce(RAND_DRBG *drbg,
+ unsigned char *out, size_t outlen)
+{
+ OPENSSL_clear_free(out, outlen);
+}
+
+/*
+ * Set the |drbg|'s callback data pointer for the entropy and nonce callbacks
+ *
+ * The ownership of the context data remains with the caller,
+ * i.e., it is the caller's responsibility to keep it available as long
+ * as it is need by the callbacks and free it after use.
+ *
+ * Setting the callback data is allowed only if the drbg has not been
+ * initialized yet. Otherwise, the operation will fail.
+ *
+ * Returns 1 on success, 0 on failure.
+ */
+int RAND_DRBG_set_callback_data(RAND_DRBG *drbg, void *data)
+{
+ if (drbg->state != DRBG_UNINITIALISED
+ || drbg->parent != NULL)
+ return 0;
+
+ drbg->callback_data = data;
+ return 1;
+}
+
+/* Retrieve the callback data pointer */
+void *RAND_DRBG_get_callback_data(RAND_DRBG *drbg)
+{
+ return drbg->callback_data;
+}
+