initial commit

crypto/openssl/rand.hpp

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+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#pragma once
+#include <string>
+#include <cassert>
+
+namespace prng {
+
+// use this generator unless need a separate one
+class RandomGen;
+RandomGen &rand_gen();
+
+class RandomGen {
+ public:
+  struct rand_error {};
+  void randomize(bool force = true);
+  void seed_add(const void *data, std::size_t size, double entropy = 0);
+  bool ok() const;
+  RandomGen() {
+    randomize(false);
+  }
+  RandomGen(const void *seed, std::size_t size) {
+    seed_add(seed, size);
+    randomize(false);
+  }
+  bool rand_bytes(void *data, std::size_t size, bool strong = false);
+  bool strong_rand_bytes(void *data, std::size_t size) {
+    return rand_bytes(data, size, true);
+  }
+  template <class T>
+  bool rand_obj(T &obj) {
+    return rand_bytes(&obj, sizeof(T));
+  }
+  template <class T>
+  bool rand_objs(T *ptr, std::size_t count) {
+    return rand_bytes(ptr, sizeof(T) * count);
+  }
+  std::string rand_string(std::size_t size, bool strong = false);
+};
+}  // namespace prng