Move crypto files out of base, to a top level directory.

base/sha2.h

-// Copyright (c) 2011 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 BASE_SHA2_H_
-#define BASE_SHA2_H_
-#pragma once
-
-#include <string>
-
-#include "base/base_api.h"
-
-namespace base {
-
-// These functions perform SHA-256 operations.
-//
-// Functions for SHA-384 and SHA-512 can be added when the need arises.
-
-enum {
-  SHA256_LENGTH = 32  // length in bytes of a SHA-256 hash
-};
-
-// Computes the SHA-256 hash of the input string 'str' and stores the first
-// 'len' bytes of the hash in the output buffer 'output'.  If 'len' > 32,
-// only 32 bytes (the full hash) are stored in the 'output' buffer.
-BASE_API void SHA256HashString(const std::string& str,
-                               void* output, size_t len);
-
-// Convenience version of the above that returns the result in a 32-byte
-// string.
-BASE_API std::string SHA256HashString(const std::string& str);
-
-}  // namespace base
-
-#endif  // BASE_SHA2_H_