Sync oemcrypto reference code

This is a merge from the Widevine repo of
http://go/wvgerrit/117311
Update backwards compatibility builds

http://go/wvgerrit/117423
Restrict maximum size of key id
To protect from out-of-memory found by fuzz testing.

http://go/wvgerrit/117683
Generation number should wrap

The master generation number should wrap around on overflow. This
means that we cannot use less than to check for a skew of 1.

http://go/wvgerrit/119232
Replace 0 with nullptr

Bug: 176234903
Bug: 184866351
Bug: 161243686
Test: ran unit tests (CL affects test code only)
Merged-In: Ie787bcf9c66a7605700c3dc29a8aa16406926ce3
Change-Id: I2b02a36a70a0920f31ffc00de102a23516d4b20e

libwvdrmengine/oemcrypto/ref/test/oemcrypto_wvcrc32_unittest.cpp

@@ -1,74 +0,0 @@
-// Copyright 2021 Google LLC. All Rights Reserved. This file and proprietary
-// source code may only be used and distributed under the Widevine License
-// Agreement.
-//
-//  Reference implementation of OEMCrypto APIs
-//
-#include <gtest/gtest.h>
-
-#include "wvcrc32.h"
-
-namespace wvoec_ref {
-
-uint32_t ComputeCrc32(const std::string& s) {
-  return wvcrc32(reinterpret_cast<const uint8_t*>(s.data()), s.size());
-}
-
-uint32_t ComputeCrc32Cont(const std::string& s, uint32_t prev_crc) {
-  return wvcrc32Cont(reinterpret_cast<const uint8_t*>(s.data()), s.size(),
-                     prev_crc);
-}
-
-TEST(OEMCryptoWvCrc32Test, BasicTest) {
-  EXPECT_EQ(0xF88AC628, ComputeCrc32("abcdefg"));
-  EXPECT_EQ(0xDF520F72, ComputeCrc32("Widevine"));
-  EXPECT_EQ(0x0376E6E7, ComputeCrc32("123456789"));
-  EXPECT_EQ(0xBA62119E,
-            ComputeCrc32("The quick brown fox jumps over the lazy dog"));
-}
-
-TEST(OEMCryptoWvCrc32Test, StreamTest) {
-  const std::vector<std::string> parts = {"The ",  "quick",   " brown ",
-                                          "fox",   " jumps ", "over",
-                                          " the ", "lazy",    " dog"};
-  uint32_t crc = wvcrc32Init();
-  for (const auto& part : parts) {
-    crc = ComputeCrc32Cont(part, crc);
-  }
-  EXPECT_EQ(0xBA62119E, crc);
-}
-
-TEST(OEMCryptoWvCrc32Test, Keybox) {
-  // clang-format off
-  const uint8_t kKeyboxData[128] = {
-    // deviceID = WidevineCRCTestKeyBox
-    0x57, 0x69, 0x64, 0x65, 0x76, 0x69, 0x6e, 0x65,
-    0x43, 0x52, 0x43, 0x54, 0x65, 0x73, 0x74, 0x4b,
-    0x65, 0x79, 0x62, 0x6f, 0x78, 0x00, 0x00, 0x00,
-    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    // key = random
-    0x8a, 0x7c, 0xda, 0x3e, 0x09, 0xd9, 0x8e, 0xd5,
-    0x47, 0x47, 0x00, 0x84, 0x5a, 0x1f, 0x52, 0xd4,
-    // data = random
-    0x98, 0xa5, 0x00, 0x19, 0x8b, 0xfe, 0x54, 0xfd,
-    0xca, 0x4d, 0x26, 0xa3, 0xfa, 0xaa, 0x3b, 0x6c,
-    0x35, 0xfe, 0x03, 0x7c, 0xbf, 0x35, 0xba, 0xce,
-    0x31, 0xb5, 0x1e, 0x3c, 0x49, 0xd6, 0x3f, 0x9c,
-    0x3a, 0xde, 0x9b, 0x58, 0xcc, 0x54, 0x8d, 0xc0,
-    0x4b, 0x04, 0xcc, 0xee, 0xae, 0x4d, 0x9f, 0x90,
-    0xd3, 0xf3, 0xfe, 0x23, 0x26, 0x13, 0x56, 0x80,
-    0xe4, 0x3b, 0x79, 0x22, 0x69, 0x5d, 0xd6, 0xb7,
-    0xa0, 0x0e, 0x7e, 0x07, 0xcd, 0x1a, 0x15, 0xca,
-    // magic
-    'k', 'b', 'o', 'x',
-    // crc
-    0x09, 0x7b, 0x7e, 0xcc
-  };
-  // clang-format on
-  const uint32_t crc_computed = wvcrc32n(kKeyboxData, 124);
-  uint32_t crc_current;
-  memcpy(&crc_current, &kKeyboxData[124], 4);
-  EXPECT_EQ(crc_computed, crc_current);
-}
-
-}  // namespace wvoec_ref