initial commit

tdutils/td/utils/AesCtrByteFlow.h

@@ -0,0 +1,68 @@
+/*
+    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 "td/utils/ByteFlow.h"
+#include "td/utils/common.h"
+#include "td/utils/crypto.h"
+#include "td/utils/Slice.h"
+#include "td/utils/Status.h"
+#include "td/utils/UInt.h"
+
+namespace td {
+
+#if TD_HAVE_OPENSSL
+class AesCtrByteFlow : public ByteFlowInplaceBase {
+ public:
+  void init(const UInt256 &key, const UInt128 &iv) {
+    state_.init(key, iv);
+  }
+  void init(AesCtrState &&state) {
+    state_ = std::move(state);
+  }
+  AesCtrState move_aes_ctr_state() {
+    return std::move(state_);
+  }
+  void loop() override {
+    bool was_updated = false;
+    while (true) {
+      auto ready = input_->prepare_read();
+      if (ready.empty()) {
+        break;
+      }
+      state_.encrypt(ready, MutableSlice(const_cast<char *>(ready.data()), ready.size()));
+      input_->confirm_read(ready.size());
+      output_.advance_end(ready.size());
+      was_updated = true;
+    }
+    if (was_updated) {
+      on_output_updated();
+    }
+    if (!is_input_active_) {
+      finish(Status::OK());  // End of input stream.
+    }
+    set_need_size(1);
+  }
+
+ private:
+  AesCtrState state_;
+};
+#endif
+
+}  // namespace td