1/* -*- C++ -*-
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/StringRef.h"
32#include "llvm/Support/Endian.h"
33#include <array>
34#include <cstdint>
35
36namespace llvm {
37
38template <unsigned N> class SmallString;
39template <typename T> class ArrayRef;
40
41class MD5 {
42 // Any 32-bit or wider unsigned integer data type will do.
43 typedef uint32_t MD5_u32plus;
44
45 MD5_u32plus a = 0x67452301;
46 MD5_u32plus b = 0xefcdab89;
47 MD5_u32plus c = 0x98badcfe;
48 MD5_u32plus d = 0x10325476;
49 MD5_u32plus hi = 0;
50 MD5_u32plus lo = 0;
51 uint8_t buffer[64];
52 MD5_u32plus block[16];
53
54public:
55 struct MD5Result {
56 std::array<uint8_t, 16> Bytes;
57
58 operator std::array<uint8_t, 16>() const { return Bytes; }
59
60 const uint8_t &operator[](size_t I) const { return Bytes[I]; }
61 uint8_t &operator[](size_t I) { return Bytes[I]; }
62
63 SmallString<32> digest() const;
64
65 uint64_t low() const {
66 // Our MD5 implementation returns the result in little endian, so the low
67 // word is first.
68 using namespace support;
69 return endian::read<uint64_t, little, unaligned>(Bytes.data());
70 }
71
72 uint64_t high() const {
73 using namespace support;
74 return endian::read<uint64_t, little, unaligned>(Bytes.data() + 8);
75 }
76 std::pair<uint64_t, uint64_t> words() const {
77 using namespace support;
78 return std::make_pair(high(), low());
79 }
80 };
81
82 MD5();
83
84 /// Updates the hash for the byte stream provided.
85 void update(ArrayRef<uint8_t> Data);
86
87 /// Updates the hash for the StringRef provided.
88 void update(StringRef Str);
89
90 /// Finishes off the hash and puts the result in result.
91 void final(MD5Result &Result);
92
93 /// Translates the bytes in \p Res to a hex string that is
94 /// deposited into \p Str. The result will be of length 32.
95 static void stringifyResult(MD5Result &Result, SmallString<32> &Str);
96
97 /// Computes the hash for a given bytes.
98 static std::array<uint8_t, 16> hash(ArrayRef<uint8_t> Data);
99
100private:
101 const uint8_t *body(ArrayRef<uint8_t> Data);
102};
103
104inline bool operator==(const MD5::MD5Result &LHS, const MD5::MD5Result &RHS) {
105 return LHS.Bytes == RHS.Bytes;
106}
107
108/// Helper to compute and return lower 64 bits of the given string's MD5 hash.
109inline uint64_t MD5Hash(StringRef Str) {
110 using namespace support;
111
112 MD5 Hash;
113 Hash.update(Str);
114 MD5::MD5Result Result;
115 Hash.final(Result);
116 // Return the least significant word.
117 return Result.low();
118}
119
120} // end namespace llvm
121
122#endif // LLVM_SUPPORT_MD5_H
123