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79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
// Copyright (c) 2011 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_MD5_H_
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#define BASE_MD5_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "base/base_export.h"
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#include "base/strings/string_piece.h"
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namespace base {
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// MD5 stands for Message Digest algorithm 5.
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// MD5 is a robust hash function, designed for cyptography, but often used
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// for file checksums. The code is complex and slow, but has few
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// collisions.
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// See Also:
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// http://en.wikipedia.org/wiki/MD5
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// These functions perform MD5 operations. The simplest call is MD5Sum() to
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// generate the MD5 sum of the given data.
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//
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// You can also compute the MD5 sum of data incrementally by making multiple
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// calls to MD5Update():
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// MD5Context ctx; // intermediate MD5 data: do not use
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// MD5Init(&ctx);
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// MD5Update(&ctx, data1, length1);
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// MD5Update(&ctx, data2, length2);
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// ...
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//
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// MD5Digest digest; // the result of the computation
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// MD5Final(&digest, &ctx);
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//
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// You can call MD5DigestToBase16() to generate a string of the digest.
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// The output of an MD5 operation.
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struct MD5Digest {
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uint8_t a[16];
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};
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// Used for storing intermediate data during an MD5 computation. Callers
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// should not access the data.
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typedef char MD5Context[88];
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// Initializes the given MD5 context structure for subsequent calls to
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// MD5Update().
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BASE_EXPORT void MD5Init(MD5Context* context);
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// For the given buffer of |data| as a StringPiece, updates the given MD5
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// context with the sum of the data. You can call this any number of times
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// during the computation, except that MD5Init() must have been called first.
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BASE_EXPORT void MD5Update(MD5Context* context, const StringPiece& data);
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// Finalizes the MD5 operation and fills the buffer with the digest.
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BASE_EXPORT void MD5Final(MD5Digest* digest, MD5Context* context);
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// MD5IntermediateFinal() generates a digest without finalizing the MD5
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// operation. Can be used to generate digests for the input seen thus far,
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// without affecting the digest generated for the entire input.
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BASE_EXPORT void MD5IntermediateFinal(MD5Digest* digest,
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const MD5Context* context);
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// Converts a digest into human-readable hexadecimal.
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BASE_EXPORT std::string MD5DigestToBase16(const MD5Digest& digest);
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// Computes the MD5 sum of the given data buffer with the given length.
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// The given 'digest' structure will be filled with the result data.
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BASE_EXPORT void MD5Sum(const void* data, size_t length, MD5Digest* digest);
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// Returns the MD5 (in hexadecimal) of a string.
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BASE_EXPORT std::string MD5String(const StringPiece& str);
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} // namespace base
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#endif // BASE_MD5_H_
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