Repo created

TMessagesProj/jni/voip/webrtc/base/hash/md5_constexpr.h

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+// Copyright 2019 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_HASH_MD5_CONSTEXPR_H_
+#define BASE_HASH_MD5_CONSTEXPR_H_
+
+#include "base/hash/md5.h"
+#include "base/hash/md5_constexpr_internal.h"
+
+namespace base {
+
+// An constexpr implementation of the MD5 hash function. This is no longer
+// considered cryptographically secure, but it is useful as a string hashing
+// primitive.
+//
+// This is not the most efficient implementation, so it is not intended to be
+// used at runtime. If you do attempt to use it at runtime you will see
+// errors about missing symbols.
+
+// Calculates the MD5 digest of the provided data. When passing |string| with
+// no explicit length the terminating null will not be processed.
+constexpr MD5Digest MD5SumConstexpr(const char* string);
+constexpr MD5Digest MD5SumConstexpr(const char* data, uint32_t length);
+
+// Calculates the first 32/64 bits of the MD5 digest of the provided data,
+// returned as a uint32_t/uint64_t. When passing |string| with no explicit
+// length the terminating null will not be processed. This abstracts away
+// endianness so that the integer will read as the first 4 or 8 bytes of the
+// MD5 sum, ensuring that the following outputs are equivalent for
+// convenience:
+//
+// printf("%08x\n", MD5HashConstexpr32("foo"));
+//
+// MD5Digest d = MD5SumConstexpr("foo");
+// printf("%02x%02x%02x%02x\n", d.a[0], d.a[1], d.a[2], d.a[3]);
+constexpr uint64_t MD5Hash64Constexpr(const char* string);
+constexpr uint64_t MD5Hash64Constexpr(const char* data, uint32_t length);
+constexpr uint32_t MD5Hash32Constexpr(const char* string);
+constexpr uint32_t MD5Hash32Constexpr(const char* data, uint32_t length);
+
+}  // namespace base
+
+#endif  // BASE_HASH_MD5_CONSTEXPR_H_