Initial version of Blimp BlobCache.

blimp/common/blob_cache/sha1_util.h

Index: blimp/common/blob_cache/sha1_util.h
diff --git a/blimp/common/blob_cache/sha1_util.h b/blimp/common/blob_cache/sha1_util.h
new file mode 100644
index 0000000000000000000000000000000000000000..5705893f6cc452a436eda4090be23fb2f9ce4d94
--- /dev/null
+++ b/blimp/common/blob_cache/sha1_util.h
@@ -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.
+
+#ifndef BLIMP_COMMON_BLOB_CACHE_SHA1_UTIL_H_
+#define BLIMP_COMMON_BLOB_CACHE_SHA1_UTIL_H_
+
+#include <string>
+#include <vector>
+
+#include "blimp/common/blimp_common_export.h"
+
+namespace blimp {
+
+// Returns the bytes of a SHA1 hash of the input. The vector is guaranteed
+// to have length base::kSHA1Length.
+BLIMP_COMMON_EXPORT std::vector<unsigned char> ToSHA1HashBytes(
+    const void* data,
+    size_t data_size);
+
+// Returns a hexadecimal string representation of a SHA1 hash. The input is
+// required to have length base::kSHA1Length.
+BLIMP_COMMON_EXPORT const std::string ToSHA1HexString(const void* data);

[Kevin M, 2016/04/14 20:08:30]

It's hard to distinguish this -- which doesn't hash |data| -- from
ToSHA1HashBytes, which does hash |data|.

How about FormatSHA1Hash?

[nyquist, 2016/04/15 01:27:12]

Agreed. Done.

+
+}  // namespace blimp
+
+#endif  // BLIMP_COMMON_BLOB_CACHE_SHA1_UTIL_H_