crypto: Add BoringSSL accelerated version of SHA-1

crypto/sha1.h

+// Copyright (c) 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 CRYPTO_SHA1_H_
+#define CRYPTO_SHA1_H_
+
+#include <stddef.h>
+
+#include <string>
+
+#include "base/strings/string_piece.h"
+#include "crypto/crypto_export.h"
+
+namespace crypto {
+
+// These functions perform SHA-1 operations.
+
+static const size_t kSHA1Length = 20;  // Length in bytes of a SHA-256 hash.
+
+// Computes the SHA-1 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.
+CRYPTO_EXPORT void SHA1HashString(const base::StringPiece& str,
+                                  void* output,
+                                  size_t len);
+
+// Convenience version of the above that returns the result in a 32-byte
+// string.
+CRYPTO_EXPORT std::string SHA1HashString(const base::StringPiece& str);
+
+}  // namespace crypto
+
+#endif  // CRYPTO_SHA1_H_