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

src/openpgp/openpgp.h

@@ -0,0 +1,122 @@
+// 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 <vector>
+
+#include <gcrypt.h>
+
+#include <span.h>
+
+#include "s_expression.h"
+
+namespace openpgp
+{
+
+enum algorithm : uint8_t
+{
+  rsa = 1,
+};
+
+class public_key_rsa
+{
+public:
+  public_key_rsa(const std::string &armored);
+  public_key_rsa(std::tuple<std::string, s_expression, size_t> params);
+
+  size_t bits() const;
+  const gcry_sexp_t &get() const;
+  std::string user_id() const;
+
+private:
+  static std::tuple<std::string, s_expression, size_t> decode(const std::string &armored);
+  static std::tuple<std::string, s_expression, size_t> decode(const epee::span<const uint8_t> buffer);
+
+private:
+  s_expression m_expression;
+  size_t m_bits;
+  std::string m_user_id;
+};
+
+class signature_rsa
+{
+public:
+  enum type : uint8_t
+  {
+    binary_document = 0,
+    canonical_text_document = 1,
+  };
+
+  signature_rsa(
+    uint8_t algorithm,
+    std::pair<uint8_t, uint8_t> hash_leftmost_bytes,
+    uint8_t hash_algorithm,
+    const std::vector<uint8_t> &hashed_data,
+    type type,
+    s_expression signature,
+    uint8_t version);
+
+  static signature_rsa from_armored(const std::string &armored_signed_message);
+  static signature_rsa from_base64(const std::string &base64);
+  static signature_rsa from_buffer(const epee::span<const uint8_t> input);
+
+  bool verify(const epee::span<const uint8_t> message, const public_key_rsa &public_key) const;
+
+private:
+  s_expression hash_message(const epee::span<const uint8_t> message, size_t public_key_bits) const;
+  std::vector<uint8_t> hash_asn_object_id() const;
+  s_expression hash_bytes(const epee::span<const uint8_t> message, size_t public_key_bits) const;
+
+  static std::vector<uint8_t> format_hashed_appendix(
+    uint8_t algorithm,
+    uint8_t hash_algorithm,
+    const std::vector<uint8_t> &hashed_data,
+    uint8_t type,
+    uint8_t version);
+
+private:
+  uint8_t m_hash_algorithm;
+  std::pair<uint8_t, uint8_t> m_hash_leftmost_bytes;
+  std::vector<uint8_t> m_hashed_appendix;
+  s_expression m_signature;
+  type m_type;
+};
+
+class message_armored
+{
+public:
+  message_armored(const std::string &message_armored);
+
+  operator epee::span<const uint8_t>() const;
+
+private:
+  std::string m_message;
+};
+
+} // namespace openpgp