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