'--verify-update', shasum support, OpenPGP signatures verification

src/openpgp/mpi.h

@@ -0,0 +1,78 @@
+// Copyright (c) 2020, 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.
+
+#pragma once
+
+#include <gcrypt.h>
+
+namespace openpgp
+{
+
+class mpi
+{
+public:
+  mpi(const mpi &) = delete;
+  mpi &operator=(const mpi &) = delete;
+
+  mpi(mpi &&other)
+    : data(other.data)
+  {
+    other.data = nullptr;
+  }
+
+  template <
+    typename byte_container,
+    typename = typename std::enable_if<(sizeof(typename byte_container::value_type) == 1)>::type>
+  mpi(const byte_container &buffer, gcry_mpi_format format = GCRYMPI_FMT_USG)
+    : mpi(&buffer[0], buffer.size(), format)
+  {
+  }
+
+  mpi(const void *buffer, size_t size, gcry_mpi_format format = GCRYMPI_FMT_USG)
+  {
+    if (gcry_mpi_scan(&data, format, buffer, size, nullptr) != GPG_ERR_NO_ERROR)
+    {
+      throw std::runtime_error("failed to read mpi from buffer");
+    }
+  }
+
+  ~mpi()
+  {
+    gcry_mpi_release(data);
+  }
+
+  const gcry_mpi_t &get() const
+  {
+    return data;
+  }
+
+private:
+  gcry_mpi_t data;
+};
+
+} // namespace openpgp