MD5.h revision 309124 
1/*
2 * This code is derived from (original license follows):
3 *
4 * This is an OpenSSL-compatible implementation of the RSA Data Security, Inc.
5 * MD5 Message-Digest Algorithm (RFC 1321).
6 *
7 * Homepage:
8 * http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
9 *
10 * Author:
11 * Alexander Peslyak, better known as Solar Designer <solar at openwall.com>
12 *
13 * This software was written by Alexander Peslyak in 2001.  No copyright is
14 * claimed, and the software is hereby placed in the public domain.
15 * In case this attempt to disclaim copyright and place the software in the
16 * public domain is deemed null and void, then the software is
17 * Copyright (c) 2001 Alexander Peslyak and it is hereby released to the
18 * general public under the following terms:
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted.
22 *
23 * There's ABSOLUTELY NO WARRANTY, express or implied.
24 *
25 * See md5.c for more information.
26 */
27
28#ifndef LLVM_SUPPORT_MD5_H
29#define LLVM_SUPPORT_MD5_H
30
31#include "llvm/ADT/SmallString.h"
32#include "llvm/Support/DataTypes.h"
33#include "llvm/Support/Endian.h"
34
35namespace llvm {
36template <typename T> class ArrayRef;
37
38class MD5 {
39  // Any 32-bit or wider unsigned integer data type will do.
40  typedef uint32_t MD5_u32plus;
41
42  MD5_u32plus a, b, c, d;
43  MD5_u32plus hi, lo;
44  uint8_t buffer[64];
45  MD5_u32plus block[16];
46
47public:
48  typedef uint8_t MD5Result[16];
49
50  MD5();
51
52  /// \brief Updates the hash for the byte stream provided.
53  void update(ArrayRef<uint8_t> Data);
54
55  /// \brief Updates the hash for the StringRef provided.
56  void update(StringRef Str);
57
58  /// \brief Finishes off the hash and puts the result in result.
59  void final(MD5Result &Result);
60
61  /// \brief Translates the bytes in \p Res to a hex string that is
62  /// deposited into \p Str. The result will be of length 32.
63  static void stringifyResult(MD5Result &Result, SmallString<32> &Str);
64
65private:
66  const uint8_t *body(ArrayRef<uint8_t> Data);
67};
68
69/// Helper to compute and return lower 64 bits of the given string's MD5 hash.
70inline uint64_t MD5Hash(StringRef Str) {
71  MD5 Hash;
72  Hash.update(Str);
73  llvm::MD5::MD5Result Result;
74  Hash.final(Result);
75  // Return the least significant 8 bytes. Our MD5 implementation returns the
76  // result in little endian, so we may need to swap bytes.
77  using namespace llvm::support;
78  return endian::read<uint64_t, little, unaligned>(Result);
79}
80
81}
82
83#endif
84