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+// Copyright (c) 2017-2018, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+
+#ifndef MONERO_EXCEPTIONS_H
+#define MONERO_EXCEPTIONS_H
+
+#include <exception>
+#include <string>
+#include <boost/optional.hpp>
+
+namespace hw {
+namespace trezor {
+namespace exc {
+
+  class SecurityException : public std::exception {
+  protected:
+    boost::optional<std::string> reason;
+
+  public:
+    SecurityException(): reason("General Security exception"){}
+    explicit SecurityException(std::string what): reason(what){}
+
+    virtual const char* what() const throw() {
+      return reason.get().c_str();
+    }
+  };
+
+  class Poly1305TagInvalid: public SecurityException {
+  public:
+    using SecurityException::SecurityException;
+    Poly1305TagInvalid(): SecurityException("Poly1305 authentication tag invalid"){}
+  };
+
+  class TrezorException : public std::exception {
+  protected:
+    boost::optional<std::string> reason;
+
+  public:
+    TrezorException(): reason("General Trezor exception"){}
+    explicit TrezorException(std::string what): reason(what){}
+
+    virtual const char* what() const throw() {
+      return reason.get().c_str();
+    }
+  };
+
+  class CommunicationException: public TrezorException {
+  public:
+    using TrezorException::TrezorException;
+    CommunicationException(): TrezorException("Trezor communication error"){}
+  };
+
+  class EncodingException: public CommunicationException {
+  public:
+    using CommunicationException::CommunicationException;
+    EncodingException(): CommunicationException("Trezor message encoding error"){}
+  };
+
+  class NotConnectedException : public CommunicationException {
+  public:
+    using CommunicationException::CommunicationException;
+    NotConnectedException(): CommunicationException("Trezor not connected"){}
+  };
+
+  class DeviceNotResponsiveException : public CommunicationException {
+  public:
+    using CommunicationException::CommunicationException;
+    DeviceNotResponsiveException(): CommunicationException("Trezor does not respond to ping"){}
+  };
+
+  class DeviceAcquireException : public CommunicationException {
+  public:
+    using CommunicationException::CommunicationException;
+    DeviceAcquireException(): CommunicationException("Trezor could not be acquired"){}
+  };
+
+  class SessionException: public CommunicationException {
+  public:
+    using CommunicationException::CommunicationException;
+    SessionException(): CommunicationException("Trezor session expired"){}
+  };
+
+  class TimeoutException: public CommunicationException {
+  public:
+    using CommunicationException::CommunicationException;
+    TimeoutException(): CommunicationException("Trezor communication timeout"){}
+  };
+
+  class ProtocolException: public CommunicationException {
+  public:
+    using CommunicationException::CommunicationException;
+    ProtocolException(): CommunicationException("Trezor protocol error"){}
+  };
+
+  // Communication protocol namespace
+  // Separated to distinguish between client and Trezor side exceptions.
+namespace proto {
+
+  class SecurityException : public ProtocolException {
+  public:
+    using ProtocolException::ProtocolException;
+    SecurityException(): ProtocolException("Security assertion violated in the protocol"){}
+  };
+
+  class FailureException : public ProtocolException {
+  private:
+    boost::optional<uint32_t> code;
+    boost::optional<std::string> message;
+  public:
+    using ProtocolException::ProtocolException;
+    FailureException(): ProtocolException("Trezor returned failure"){}
+    FailureException(boost::optional<uint32_t> code,
+                     boost::optional<std::string> message)
+        : code(code), message(message) {
+      reason = "Trezor returned failure: code="
+               + (code ? std::to_string(code.get()) : "")
+               + ", message=" + (message ? message.get() : "");
+    };
+  };
+
+  class UnexpectedMessageException : public FailureException {
+  public:
+    using FailureException::FailureException;
+    UnexpectedMessageException(): FailureException("Trezor claims unexpected message received"){}
+  };
+
+  class CancelledException : public FailureException {
+  public:
+    using FailureException::FailureException;
+    CancelledException(): FailureException("Trezor returned: cancelled operation"){}
+  };
+
+  class PinExpectedException : public FailureException {
+  public:
+    using FailureException::FailureException;
+    PinExpectedException(): FailureException("Trezor claims PIN is expected"){}
+  };
+
+  class InvalidPinException : public FailureException {
+  public:
+    using FailureException::FailureException;
+    InvalidPinException(): FailureException("Trezor claims PIN is invalid"){}
+  };
+
+  class NotEnoughFundsException : public FailureException {
+  public:
+    using FailureException::FailureException;
+    NotEnoughFundsException(): FailureException("Trezor claims not enough funds"){}
+  };
+
+  class NotInitializedException : public FailureException {
+  public:
+    using FailureException::FailureException;
+    NotInitializedException(): FailureException("Trezor claims not initialized"){}
+  };
+
+  class FirmwareErrorException : public FailureException {
+  public:
+    using FailureException::FailureException;
+    FirmwareErrorException(): FailureException("Trezor returned firmware error"){}
+  };
+
+}
+}
+}
+}
+#endif //MONERO_EXCEPTIONS_H