1 files changed, 93 insertions, 0 deletions
diff --git a/dom/media/gmp/rlz/lib/machine_id.cc b/dom/media/gmp/rlz/lib/machine_id.cc
new file mode 100644
index 0000000000..b2943f90ff
--- /dev/null
+++ b/dom/media/gmp/rlz/lib/machine_id.cc
@@ -0,0 +1,93 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "rlz/lib/machine_id.h"
+
+#include <stddef.h>
+
+#include "rlz/lib/assert.h"
+#include "rlz/lib/crc8.h"
+#include "rlz/lib/string_utils.h"
+
+// Note: The original machine_id.cc code depends on Chromium's sha1 implementation.
+// Using Mozilla's implmentation as replacement to reduce the dependency of
+// some external files.
+#include "mozilla/SHA1.h"
+
+namespace rlz_lib {
+
+bool GetMachineId(std::string* machine_id) {
+  if (!machine_id)
+    return false;
+
+  static std::string calculated_id;
+  static bool calculated = false;
+  if (calculated) {
+    *machine_id = calculated_id;
+    return true;
+  }
+
+  std::vector<uint8_t> sid_bytes;
+  int volume_id;
+  if (!GetRawMachineId(&sid_bytes, &volume_id))
+    return false;
+
+  if (!testing::GetMachineIdImpl(sid_bytes, volume_id, machine_id))
+    return false;
+
+  calculated = true;
+  calculated_id = *machine_id;
+  return true;
+}
+
+namespace testing {
+
+bool GetMachineIdImpl(const std::vector<uint8_t>& sid_bytes,
+                      int volume_id,
+                      std::string* machine_id) {
+  machine_id->clear();
+
+  // The ID should be the SID hash + the Hard Drive SNo. + checksum byte.
+  static const int kSizeWithoutChecksum = mozilla::SHA1Sum::kHashSize + sizeof(int);
+  std::basic_string<unsigned char> id_binary(kSizeWithoutChecksum + 1, 0);
+
+  if (!sid_bytes.empty()) {
+    // In order to be compatible with the old version of RLZ, the hash of the
+    // SID must be done with all the original bytes from the unicode string.
+    // However, the chromebase SHA1 hash function takes only an std::string as
+    // input, so the unicode string needs to be converted to std::string
+    // "as is".
+    size_t byte_count = sid_bytes.size() * sizeof(std::vector<uint8_t>::value_type);
+    const char* buffer = reinterpret_cast<const char*>(sid_bytes.data());
+
+    // Note that digest can have embedded nulls.
+    mozilla::SHA1Sum SHA1;
+    mozilla::SHA1Sum::Hash hash;
+    SHA1.update(buffer, byte_count);
+    SHA1.finish(hash);
+    std::string digest(reinterpret_cast<char*>(hash), mozilla::SHA1Sum::kHashSize);
+    VERIFY(digest.size() == mozilla::SHA1Sum::kHashSize);
+    std::copy(digest.begin(), digest.end(), id_binary.begin());
+  }
+
+  // Convert from int to binary (makes big-endian).
+  for (size_t i = 0; i < sizeof(int); i++) {
+    int shift_bits = 8 * (sizeof(int) - i - 1);
+    id_binary[mozilla::SHA1Sum::kHashSize + i] = static_cast<unsigned char>(
+        (volume_id >> shift_bits) & 0xFF);
+  }
+
+  // Append the checksum byte.
+  if (!sid_bytes.empty() || (0 != volume_id))
+    rlz_lib::Crc8::Generate(id_binary.c_str(),
+                            kSizeWithoutChecksum,
+                            &id_binary[kSizeWithoutChecksum]);
+
+  return rlz_lib::BytesToString(
+      id_binary.c_str(), kSizeWithoutChecksum + 1, machine_id);
+}
+
+}  // namespace testing
+
+}  // namespace rlz_lib