1 files changed, 55 insertions, 0 deletions
diff --git a/libs/tdlib/td/tdutils/td/utils/AesCtrByteFlow.h b/libs/tdlib/td/tdutils/td/utils/AesCtrByteFlow.h
new file mode 100644
index 0000000000..820aa02fbe
--- /dev/null
+++ b/libs/tdlib/td/tdutils/td/utils/AesCtrByteFlow.h
@@ -0,0 +1,55 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#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"
+
+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