Cast: Added support for AES-CTR crypto.

media/cast/test/crypto_utility.cc

Index: media/cast/test/crypto_utility.cc
diff --git a/media/cast/test/crypto_utility.cc b/media/cast/test/crypto_utility.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9063af4c688ce18d179bbd931b5ca4173018c519
--- /dev/null
+++ b/media/cast/test/crypto_utility.cc
@@ -0,0 +1,42 @@
+// Copyright 2013 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 "media/cast/test/crypto_utility.h"
+
+namespace {
+
+char ConvertFromBase16Char(char base_16) {
+  DCHECK((base_16 >= '0' && base_16 <= '9') ||
+         (base_16 >= 'a' && base_16 <= 'f') ||
+         (base_16 >= 'A' && base_16 <= 'F'));
+
+  if (base_16 >= '0' && base_16 <= '9') {
+    return base_16 - '0';
+  }
+  if (base_16 >= 'a' && base_16 <= 'f') {
+    return base_16 - 'a' + 10;
+  }
+  return base_16 - 'A' + 10;
+}
+}  // namespace

[wtc, 2013/11/13 20:57:17]

Nit: add a blank line before this line. (This is probably moot.)

[pwestin, 2013/11/15 19:38:17]

removed this code

+
+namespace media {
+namespace cast {
+
+std::string ConvertFromBase16String(const std::string base_16) {
+  std::string compressed;
+  DCHECK(base_16.size() % 2 == 0) << "Must be a multiple of 2";
+  compressed.reserve(base_16.size() / 2);
+
+  for (std::string::const_iterator it = base_16.begin(); it != base_16.end();
+      ++it) {
+    char first_part = ConvertFromBase16Char(*it++);
+    char second_part = ConvertFromBase16Char(*it);
+    compressed.push_back((first_part << 4) + second_part);
+  }
+  return compressed;
+}
+
+}  // namespace cast
+}  // namespace media