text: /* Copyright (c) 2015, Google Inc.
   *
   * Permission to use, copy, modify, and/or distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
   * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
   * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
   * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
  
  #include <stdio.h>
  #include <string.h>
  
  #include <vector>
  
  #include <gtest/gtest.h>
  
  #include <openssl/poly1305.h>
  
  #include "../internal.h"
  #include "../test/file_test.h"
  #include "../test/test_util.h"
  
  
  static void TestSIMD(unsigned excess, const std::vector<uint8_t> &key,
                       const std::vector<uint8_t> &in,
                       const std::vector<uint8_t> &mac) {
    poly1305_state state;
    CRYPTO_poly1305_init(&state, key.data());
  
    size_t done = 0;
  
    // Feed 16 bytes in. Some implementations begin in non-SIMD mode and upgrade
    // on-demand. Stress the upgrade path.
    size_t todo = 16;
    if (todo > in.size()) {
      todo = in.size();
    }
    CRYPTO_poly1305_update(&state, in.data(), todo);
    done += todo;
  
    for (;;) {
      // Feed 128 + |excess| bytes to test SIMD mode.
      if (done + 128 + excess > in.size()) {
        break;
      }
      CRYPTO_poly1305_update(&state, in.data() + done, 128 + excess);
      done += 128 + excess;
  
      // Feed |excess| bytes to ensure SIMD mode can handle short inputs.
      if (done + excess > in.size()) {
        break;
      }
      CRYPTO_poly1305_update(&state, in.data() + done, excess);
      done += excess;
    }
  
    // Consume the remainder and finish.
    CRYPTO_poly1305_update(&state, in.data() + done, in.size() - done);
  
    uint8_t out[16];
    CRYPTO_poly1305_finish(&state, out);
    EXPECT_EQ(Bytes(out), Bytes(mac)) << "SIMD pattern " << excess << " failed.";
  }
  
  TEST(Poly1305Test, TestVectors) {
    FileTestGTest("crypto/poly1305/poly1305_tests.txt", [](FileTest *t) {
      std::vector<uint8_t> key, in, mac;
      ASSERT_TRUE(t->GetBytes(&key, "Key"));
      ASSERT_TRUE(t->GetBytes(&in, "Input"));
      ASSERT_TRUE(t->GetBytes(&mac, "MAC"));
      ASSERT_EQ(32u, key.size());
      ASSERT_EQ(16u, mac.size());
  
      // Test single-shot operation.
      poly1305_state state;
      CRYPTO_poly1305_init(&state, key.data());
      CRYPTO_poly1305_update(&state, in.data(), in.size());
      uint8_t out[16];
      CRYPTO_poly1305_finish(&state, out);
      EXPECT_EQ(Bytes(out), Bytes(mac)) << "Single-shot Poly1305 failed.";
  
      // Test streaming byte-by-byte.
      CRYPTO_poly1305_init(&state, key.data());
      for (size_t i = 0; i < in.size(); i++) {
        CRYPTO_poly1305_update(&state, &in[i], 1);
      }
      CRYPTO_poly1305_finish(&state, out);
      EXPECT_EQ(Bytes(out), Bytes(mac)) << "Streaming Poly1305 failed.";
  
      // Test |CRYPTO_poly1305_init| and |CRYPTO_poly1305_finish| work on
      // unaligned values.
      alignas(8) uint8_t unaligned_key[32 + 1];
      OPENSSL_memcpy(unaligned_key + 1, key.data(), 32);
      CRYPTO_poly1305_init(&state, unaligned_key + 1);
      CRYPTO_poly1305_update(&state, in.data(), in.size());
      alignas(8) uint8_t unaligned_out[16 + 1];
      CRYPTO_poly1305_finish(&state, unaligned_out + 1);
      EXPECT_EQ(Bytes(unaligned_out + 1, 16), Bytes(mac))
          << "Unaligned Poly1305 failed.";
  
      // Test SIMD stress patterns. OpenSSL's AVX2 assembly needs a multiple of
      // four blocks, so test up to three blocks of excess.
      TestSIMD(0, key, in, mac);
      TestSIMD(16, key, in, mac);
      TestSIMD(32, key, in, mac);
      TestSIMD(48, key, in, mac);
    });
  }
  