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 * (This is a heavily cut-down "BSD license".)
26 *
27 * This differs from Colin Plumb's older public domain implementation in that
28 * no exactly 32-bit integer data type is required (any 32-bit or wider
29 * unsigned integer data type will do), there's no compile-time endianness
30 * configuration, and the function prototypes match OpenSSL's. No code from
31 * Colin Plumb's implementation has been reused; this comment merely compares
32 * the properties of the two independent implementations.
33 *
34 * The primary goals of this implementation are portability and ease of use.
35 * It is meant to be fast, but not as fast as possible. Some known
36 * optimizations are not included to reduce source code size and avoid
37 * compile-time configuration.
38 */
39
40 #include "llvm/Support/MD5.h"
41 #include "llvm/ADT/ArrayRef.h"
42 #include "llvm/ADT/SmallString.h"
43 #include "llvm/ADT/StringExtras.h"
44 #include "llvm/ADT/StringRef.h"
45 #include "llvm/Support/Endian.h"
46 #include <array>
47 #include <cstdint>
48 #include <cstring>
49
50 // The basic MD5 functions.
51
52 // F and G are optimized compared to their RFC 1321 definitions for
53 // architectures that lack an AND-NOT instruction, just like in Colin Plumb's
54 // implementation.
55 #define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
56 #define G(x, y, z) ((y) ^ ((z) & ((x) ^ (y))))
57 #define H(x, y, z) ((x) ^ (y) ^ (z))
58 #define I(x, y, z) ((y) ^ ((x) | ~(z)))
59
60 // The MD5 transformation for all four rounds.
61 #define STEP(f, a, b, c, d, x, t, s) \
62 (a) += f((b), (c), (d)) + (x) + (t); \
63 (a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \
64 (a) += (b);
65
66 // SET reads 4 input bytes in little-endian byte order and stores them
67 // in a properly aligned word in host byte order.
68 #define SET(n) \
69 (InternalState.block[(n)] = (MD5_u32plus)ptr[(n)*4] | \
70 ((MD5_u32plus)ptr[(n)*4 + 1] << 8) | \
71 ((MD5_u32plus)ptr[(n)*4 + 2] << 16) | \
72 ((MD5_u32plus)ptr[(n)*4 + 3] << 24))
73 #define GET(n) (InternalState.block[(n)])
74
75 using namespace llvm;
76
77 /// This processes one or more 64-byte data blocks, but does NOT update
78 ///the bit counters. There are no alignment requirements.
body(ArrayRef<uint8_t> Data)79 const uint8_t *MD5::body(ArrayRef<uint8_t> Data) {
80 const uint8_t *ptr;
81 MD5_u32plus a, b, c, d;
82 MD5_u32plus saved_a, saved_b, saved_c, saved_d;
83 unsigned long Size = Data.size();
84
85 ptr = Data.data();
86
87 a = InternalState.a;
88 b = InternalState.b;
89 c = InternalState.c;
90 d = InternalState.d;
91
92 do {
93 saved_a = a;
94 saved_b = b;
95 saved_c = c;
96 saved_d = d;
97
98 // Round 1
99 STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7)
100 STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12)
101 STEP(F, c, d, a, b, SET(2), 0x242070db, 17)
102 STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22)
103 STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7)
104 STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12)
105 STEP(F, c, d, a, b, SET(6), 0xa8304613, 17)
106 STEP(F, b, c, d, a, SET(7), 0xfd469501, 22)
107 STEP(F, a, b, c, d, SET(8), 0x698098d8, 7)
108 STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12)
109 STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17)
110 STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22)
111 STEP(F, a, b, c, d, SET(12), 0x6b901122, 7)
112 STEP(F, d, a, b, c, SET(13), 0xfd987193, 12)
113 STEP(F, c, d, a, b, SET(14), 0xa679438e, 17)
114 STEP(F, b, c, d, a, SET(15), 0x49b40821, 22)
115
116 // Round 2
117 STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5)
118 STEP(G, d, a, b, c, GET(6), 0xc040b340, 9)
119 STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14)
120 STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20)
121 STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5)
122 STEP(G, d, a, b, c, GET(10), 0x02441453, 9)
123 STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14)
124 STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20)
125 STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5)
126 STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9)
127 STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14)
128 STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20)
129 STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5)
130 STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9)
131 STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14)
132 STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20)
133
134 // Round 3
135 STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4)
136 STEP(H, d, a, b, c, GET(8), 0x8771f681, 11)
137 STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16)
138 STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23)
139 STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4)
140 STEP(H, d, a, b, c, GET(4), 0x4bdecfa9, 11)
141 STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16)
142 STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23)
143 STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4)
144 STEP(H, d, a, b, c, GET(0), 0xeaa127fa, 11)
145 STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16)
146 STEP(H, b, c, d, a, GET(6), 0x04881d05, 23)
147 STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4)
148 STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11)
149 STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16)
150 STEP(H, b, c, d, a, GET(2), 0xc4ac5665, 23)
151
152 // Round 4
153 STEP(I, a, b, c, d, GET(0), 0xf4292244, 6)
154 STEP(I, d, a, b, c, GET(7), 0x432aff97, 10)
155 STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15)
156 STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21)
157 STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6)
158 STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10)
159 STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15)
160 STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21)
161 STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6)
162 STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10)
163 STEP(I, c, d, a, b, GET(6), 0xa3014314, 15)
164 STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21)
165 STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6)
166 STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10)
167 STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15)
168 STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21)
169
170 a += saved_a;
171 b += saved_b;
172 c += saved_c;
173 d += saved_d;
174
175 ptr += 64;
176 } while (Size -= 64);
177
178 InternalState.a = a;
179 InternalState.b = b;
180 InternalState.c = c;
181 InternalState.d = d;
182
183 return ptr;
184 }
185
186 MD5::MD5() = default;
187
188 /// Incrementally add the bytes in \p Data to the hash.
update(ArrayRef<uint8_t> Data)189 void MD5::update(ArrayRef<uint8_t> Data) {
190 MD5_u32plus saved_lo;
191 unsigned long used, free;
192 const uint8_t *Ptr = Data.data();
193 unsigned long Size = Data.size();
194
195 saved_lo = InternalState.lo;
196 if ((InternalState.lo = (saved_lo + Size) & 0x1fffffff) < saved_lo)
197 InternalState.hi++;
198 InternalState.hi += Size >> 29;
199
200 used = saved_lo & 0x3f;
201
202 if (used) {
203 free = 64 - used;
204
205 if (Size < free) {
206 memcpy(&InternalState.buffer[used], Ptr, Size);
207 return;
208 }
209
210 memcpy(&InternalState.buffer[used], Ptr, free);
211 Ptr = Ptr + free;
212 Size -= free;
213 body(ArrayRef(InternalState.buffer, 64));
214 }
215
216 if (Size >= 64) {
217 Ptr = body(ArrayRef(Ptr, Size & ~(unsigned long)0x3f));
218 Size &= 0x3f;
219 }
220
221 memcpy(InternalState.buffer, Ptr, Size);
222 }
223
224 /// Add the bytes in the StringRef \p Str to the hash.
225 // Note that this isn't a string and so this won't include any trailing NULL
226 // bytes.
update(StringRef Str)227 void MD5::update(StringRef Str) {
228 ArrayRef<uint8_t> SVal((const uint8_t *)Str.data(), Str.size());
229 update(SVal);
230 }
231
232 /// Finish the hash and place the resulting hash into \p result.
233 /// \param Result is assumed to be a minimum of 16-bytes in size.
final(MD5Result & Result)234 void MD5::final(MD5Result &Result) {
235 unsigned long used, free;
236
237 used = InternalState.lo & 0x3f;
238
239 InternalState.buffer[used++] = 0x80;
240
241 free = 64 - used;
242
243 if (free < 8) {
244 memset(&InternalState.buffer[used], 0, free);
245 body(ArrayRef(InternalState.buffer, 64));
246 used = 0;
247 free = 64;
248 }
249
250 memset(&InternalState.buffer[used], 0, free - 8);
251
252 InternalState.lo <<= 3;
253 support::endian::write32le(&InternalState.buffer[56], InternalState.lo);
254 support::endian::write32le(&InternalState.buffer[60], InternalState.hi);
255
256 body(ArrayRef(InternalState.buffer, 64));
257
258 support::endian::write32le(&Result[0], InternalState.a);
259 support::endian::write32le(&Result[4], InternalState.b);
260 support::endian::write32le(&Result[8], InternalState.c);
261 support::endian::write32le(&Result[12], InternalState.d);
262 }
263
final()264 MD5::MD5Result MD5::final() {
265 MD5Result Result;
266 final(Result);
267 return Result;
268 }
269
result()270 MD5::MD5Result MD5::result() {
271 auto StateToRestore = InternalState;
272
273 auto Hash = final();
274
275 // Restore the state
276 InternalState = StateToRestore;
277
278 return Hash;
279 }
280
digest() const281 SmallString<32> MD5::MD5Result::digest() const {
282 SmallString<32> Str;
283 toHex(*this, /*LowerCase*/ true, Str);
284 return Str;
285 }
286
stringifyResult(MD5Result & Result,SmallVectorImpl<char> & Str)287 void MD5::stringifyResult(MD5Result &Result, SmallVectorImpl<char> &Str) {
288 toHex(Result, /*LowerCase*/ true, Str);
289 }
290
hash(ArrayRef<uint8_t> Data)291 MD5::MD5Result MD5::hash(ArrayRef<uint8_t> Data) {
292 MD5 Hash;
293 Hash.update(Data);
294 MD5::MD5Result Res;
295 Hash.final(Res);
296
297 return Res;
298 }
299