// Copyright (c) 2017-2018, The Monero Project
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#include <cstdint>
#include <gtest/gtest.h>
#include <memory>
#include <sstream>
#include <string>

#include "cryptonote_basic/cryptonote_basic_impl.h"

namespace
{
  alignas(size_t) static constexpr const std::uint8_t source[] = {
    0x8b, 0x65, 0x59, 0x70, 0x15, 0x37, 0x99, 0xaf, 0x2a, 0xea, 0xdc, 0x9f, 0xf1, 0xad, 0xd0, 0xea,
    0x6c, 0x72, 0x51, 0xd5, 0x41, 0x54, 0xcf, 0xa9, 0x2c, 0x17, 0x3a, 0x0d, 0xd3, 0x9c, 0x1f, 0x94,
    0x6c, 0x72, 0x51, 0xd5, 0x41, 0x54, 0xcf, 0xa9, 0x2c, 0x17, 0x3a, 0x0d, 0xd3, 0x9c, 0x1f, 0x94,
    0x8b, 0x65, 0x59, 0x70, 0x15, 0x37, 0x99, 0xaf, 0x2a, 0xea, 0xdc, 0x9f, 0xf1, 0xad, 0xd0, 0xea
  };

  static constexpr const char expected[] =
    "8b655970153799af2aeadc9ff1add0ea6c7251d54154cfa92c173a0dd39c1f94"
    "6c7251d54154cfa92c173a0dd39c1f948b655970153799af2aeadc9ff1add0ea";

  template<typename T> void *addressof(T &t) { return &t; }
  template<> void *addressof(crypto::secret_key &k) { return addressof(unwrap(unwrap(k))); }

  template<typename T>
  bool is_formatted()
  {
    T value{};

    static_assert(alignof(T) <= alignof(size_t), "T must have size_t-or-smaller alignment");
    static_assert(sizeof(T) <= sizeof(source), "T is too large for source");
    static_assert(sizeof(T) * 2 <= sizeof(expected), "T is too large for destination");
    std::memcpy(addressof(value), source, sizeof(T));

    std::stringstream out;
    out << "BEGIN" << value << "END";  
    return out.str() == "BEGIN<" + std::string{expected, sizeof(T) * 2} + ">END";
  }
}

TEST(Crypto, Ostream)
{
  EXPECT_TRUE(is_formatted<crypto::hash8>());
  EXPECT_TRUE(is_formatted<crypto::hash>());
  EXPECT_TRUE(is_formatted<crypto::public_key>());
  EXPECT_TRUE(is_formatted<crypto::secret_key>());
  EXPECT_TRUE(is_formatted<crypto::signature>());
  EXPECT_TRUE(is_formatted<crypto::key_derivation>());
  EXPECT_TRUE(is_formatted<crypto::key_image>());
}

TEST(Crypto, null_keys)
{
  char zero[32];
  memset(zero, 0, 32);
  ASSERT_EQ(memcmp(crypto::null_skey.data, zero, 32), 0);
  ASSERT_EQ(memcmp(crypto::null_pkey.data, zero, 32), 0);
}

TEST(Crypto, verify_32)
{
  // all bytes are treated the same, so we can brute force just one byte
  unsigned char k0[32] = {0}, k1[32] = {0};
  for (unsigned int i0 = 0; i0 < 256; ++i0)
  {
    k0[0] = i0;
    for (unsigned int i1 = 0; i1 < 256; ++i1)
    {
      k1[0] = i1;
      ASSERT_EQ(!crypto_verify_32(k0, k1), i0 == i1);
    }
  }
}
