initial commit

keys/encryptor.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 "encryptor.h"
+#include "crypto/Ed25519.h"
+#include "auto/tl/ton_api.h"
+#include "tl-utils/tl-utils.hpp"
+
+namespace ton {
+
+class EncryptorNone : public Encryptor {
+ public:
+  td::Result<td::BufferSlice> encrypt(td::Slice data) override {
+    return td::BufferSlice(data);
+  }
+  td::Status check_signature(td::Slice message, td::Slice signature) override {
+    return td::Status::OK();
+  }
+
+  EncryptorNone() {
+  }
+};
+
+class DecryptorNone : public Decryptor {
+ public:
+  td::Result<td::BufferSlice> decrypt(td::Slice data) override {
+    return td::BufferSlice(data);
+  }
+  td::Result<td::BufferSlice> sign(td::Slice data) override {
+    return td::BufferSlice("");
+  }
+  DecryptorNone() {
+  }
+};
+
+class EncryptorFail : public Encryptor {
+ public:
+  td::Result<td::BufferSlice> encrypt(td::Slice data) override {
+    return td::Status::Error("Fail encryptor");
+  }
+  td::Status check_signature(td::Slice message, td::Slice signature) override {
+    return td::Status::Error("Fail encryptor");
+  }
+
+  EncryptorFail() {
+  }
+};
+
+class DecryptorFail : public Decryptor {
+ public:
+  td::Result<td::BufferSlice> decrypt(td::Slice data) override {
+    return td::Status::Error("Fail decryptor");
+  }
+  td::Result<td::BufferSlice> sign(td::Slice data) override {
+    return td::Status::Error("Fail decryptor");
+  }
+  DecryptorFail() {
+  }
+};
+
+class EncryptorEd25519 : public Encryptor {
+ private:
+  td::Ed25519::PublicKey pub_;
+
+ public:
+  td::Result<td::BufferSlice> encrypt(td::Slice data) override;
+  td::Status check_signature(td::Slice message, td::Slice signature) override;
+
+  EncryptorEd25519(td::Bits256 key) : pub_(td::SecureString(as_slice(key))) {
+  }
+};
+
+class DecryptorEd25519 : public Decryptor {
+ private:
+  td::Ed25519::PrivateKey pk_;
+
+ public:
+  td::Result<td::BufferSlice> decrypt(td::Slice data) override;
+  td::Result<td::BufferSlice> sign(td::Slice data) override;
+  DecryptorEd25519(td::Bits256 key) : pk_(td::SecureString(as_slice(key))) {
+  }
+};
+
+class EncryptorOverlay : public Encryptor {
+ public:
+  EncryptorOverlay() {
+  }
+  td::Result<td::BufferSlice> encrypt(td::Slice data) override {
+    return td::Status::Error("overlay id can not be used for encryption");
+  }
+  td::Status check_signature(td::Slice message, td::Slice signature) override {
+    auto R = fetch_tl_object<ton_api::dht_keyDescription>(message, true);
+    if (R.is_error()) {
+      return R.move_as_error();
+    }
+    if (signature.size() > 0) {
+      return td::Status::Error("overlay signature must be empty");
+    }
+    auto G = R.move_as_ok();
+    if (G->update_rule_->get_id() != ton_api::dht_updateRule_overlayNodes::ID) {
+      return td::Status::Error("overlay update rule should be 'overlayNodes'");
+    }
+    if (G->signature_.size() > 0) {
+      return td::Status::Error("overlay signature must be empty");
+    }
+    return td::Status::OK();
+  }
+};
+
+class EncryptorAES : public Encryptor {
+ private:
+  td::Bits256 shared_secret_;
+
+ public:
+  td::Result<td::BufferSlice> encrypt(td::Slice data) override;
+  td::Status check_signature(td::Slice message, td::Slice signature) override {
+    return td::Status::Error("can no sign channel messages");
+  }
+
+  EncryptorAES(td::Bits256 shared_secret) : shared_secret_(shared_secret) {
+  }
+};
+
+class DecryptorAES : public Decryptor {
+ private:
+  td::Bits256 shared_secret_;
+
+ public:
+  td::Result<td::BufferSlice> decrypt(td::Slice data) override;
+  td::Result<td::BufferSlice> sign(td::Slice data) override {
+    return td::Status::Error("can no sign channel messages");
+  }
+  DecryptorAES(td::Bits256 shared_secret) : shared_secret_(shared_secret) {
+  }
+};
+
+}  // namespace ton