Initial version of Blimp BlobCache.

blimp/common/blob_cache/id_util.cc

Index: blimp/common/blob_cache/id_util.cc
diff --git a/blimp/common/blob_cache/id_util.cc b/blimp/common/blob_cache/id_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c6f33fccfa47c3749ead008bf589ce7328f55f2d
--- /dev/null
+++ b/blimp/common/blob_cache/id_util.cc
@@ -0,0 +1,27 @@
+// Copyright 2016 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 "blimp/common/blob_cache/id_util.h"
+
+#include "base/sha1.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
+#include "blimp/common/blob_cache/blob_cache.h"
+
+namespace blimp {
+
+const BlobId CalculateBlobId(const void* data, size_t data_size) {
+  std::vector<unsigned char> sha1_hash(base::kSHA1Length);
+  base::SHA1HashBytes(static_cast<const unsigned char*>(data), data_size,

[davidben, 2016/04/22 16:39:49]

Drive-by comment: why is this using SHA-1 and not SHA-2? People have been
managing to find attacks against SHA-1 and since I assume you don't have any
legacy constraints, using SHA-1 for new things is rather poor.

+                      sha1_hash.data());
+  return std::string(reinterpret_cast<char*>(sha1_hash.data()),
+                     sha1_hash.size());
+}
+
+const std::string FormatBlobId(const BlobId& data) {
+  DCHECK_EQ(base::kSHA1Length, data.length());
+  return base::ToLowerASCII(base::HexEncode(data.data(), data.length()));
+}
+
+}  // namespace blimp