Rietveld Code Review Tool
Help | Bug tracker | Discussion group | Source code

Side by Side Diff: compiled/Md5.cpp

Issue 29606600: Issue 5146 - Implement DownloadableSubscription parsing in C++ (Closed) Base URL: https://hg.adblockplus.org/adblockpluscore/
Patch Set: Improved logic for Process() Created Dec. 5, 2017, 7:16 a.m.
Left:
Right:
Use n/p to move between diff chunks; N/P to move between comments.
Jump to:
View unified diff | Download patch
« no previous file with comments | « compiled/Md5.h ('k') | compiled/String.h » ('j') | no next file with comments »
Toggle Intra-line Diffs ('i') | Expand Comments ('e') | Collapse Comments ('c') | Show Comments Hide Comments ('s')
OLDNEW
(Empty)
1 /*
2 * This file is part of Adblock Plus <https://adblockplus.org/>,
3 * Copyright (C) 2006-present eyeo GmbH
4 *
5 * Adblock Plus is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 3 as
7 * published by the Free Software Foundation.
8 *
9 * Adblock Plus is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 /* Original notice */
19 /*
20 * This is an OpenSSL-compatible implementation of the RSA Data Security, Inc.
21 * MD5 Message-Digest Algorithm (RFC 1321).
22 *
23 * Homepage:
24 * http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
25 *
26 * Author:
27 * Alexander Peslyak, better known as Solar Designer <solar at openwall.com>
28 *
29 * This software was written by Alexander Peslyak in 2001. No copyright is
30 * claimed, and the software is hereby placed in the public domain.
31 * In case this attempt to disclaim copyright and place the software in the
32 * public domain is deemed null and void, then the software is
33 * Copyright (c) 2001 Alexander Peslyak and it is hereby released to the
34 * general public under the following terms:
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted.
38 *
39 * There's ABSOLUTELY NO WARRANTY, express or implied.
40 *
41 * (This is a heavily cut-down "BSD license".)
42 *
43 * This differs from Colin Plumb's older public domain implementation in that
44 * no exactly 32-bit integer data type is required (any 32-bit or wider
45 * unsigned integer data type will do), there's no compile-time endianness
46 * configuration, and the function prototypes match OpenSSL's. No code from
47 * Colin Plumb's implementation has been reused; this comment merely compares
48 * the properties of the two independent implementations.
49 *
50 * The primary goals of this implementation are portability and ease of use.
51 * It is meant to be fast, but not as fast as possible. Some known
52 * optimizations are not included to reduce source code size and avoid
53 * compile-time configuration.
54 */
55
56 #include <string.h>
57
58 #include "String.h"
59
60 #include "Md5.h"
61
62 /*
63 * The basic MD5 functions.
64 *
65 * F and G are optimized compared to their RFC 1321 definitions for
66 * architectures that lack an AND-NOT instruction, just like in Colin Plumb's
67 * implementation.
68 */
69 #define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
70 #define G(x, y, z) ((y) ^ ((z) & ((x) ^ (y))))
71 #define H(x, y, z) (((x) ^ (y)) ^ (z))
72 #define H2(x, y, z) ((x) ^ ((y) ^ (z)))
73 #define I(x, y, z) ((y) ^ ((x) | ~(z)))
74
75 /*
76 * The MD5 transformation for all four rounds.
77 */
78 #define STEP(f, a, b, c, d, x, t, s) \
79 (a) += f((b), (c), (d)) + (x) + (t); \
80 (a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \
81 (a) += (b)
82
83 /*
84 * SET reads 4 input bytes in little-endian byte order and stores them in a
85 * properly aligned word in host byte order.
86 *
87 * The check for little-endian architectures that tolerate unaligned memory
88 * accesses is just an optimization. Nothing will break if it fails to detect
89 * a suitable architecture.
90 *
91 * Unfortunately, this optimization may be a C strict aliasing rules violation
92 * if the caller's data buffer has effective type that cannot be aliased by
93 * uint32_t. In practice, this problem may occur if these MD5 routines are
94 * inlined into a calling function, or with future and dangerously advanced
95 * link-time optimizations. For the time being, keeping these MD5 routines in
96 * their own translation unit avoids the problem.
97 */
98 #if defined(__i386__) || defined(__x86_64__) || defined(__vax__)
99 #define SET(n) \
100 (*(uint32_t *)&ptr[(n) * 4])
101 #define GET(n) \
102 SET(n)
103 #else
104 #define SET(n) \
105 (this->block[(n)] = \
106 (uint32_t)ptr[(n) * 4] | \
107 ((uint32_t)ptr[(n) * 4 + 1] << 8) | \
108 ((uint32_t)ptr[(n) * 4 + 2] << 16) | \
109 ((uint32_t)ptr[(n) * 4 + 3] << 24))
110 #define GET(n) \
111 (this->block[(n)])
112 #endif
113
114 /*
115 * This processes one or more 64-byte data blocks, but does NOT update the bit
116 * counters. There are no alignment requirements.
117 */
118 const void *MD5::Body(const void *data, unsigned long size)
119 {
120 const unsigned char *ptr;
121 uint32_t a, b, c, d;
122 uint32_t saved_a, saved_b, saved_c, saved_d;
123
124 ptr = (const unsigned char *)data;
125
126 a = this->a;
127 b = this->b;
128 c = this->c;
129 d = this->d;
130
131 do {
132 saved_a = a;
133 saved_b = b;
134 saved_c = c;
135 saved_d = d;
136
137 /* Round 1 */
138 STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7);
139 STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12);
140 STEP(F, c, d, a, b, SET(2), 0x242070db, 17);
141 STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22);
142 STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7);
143 STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12);
144 STEP(F, c, d, a, b, SET(6), 0xa8304613, 17);
145 STEP(F, b, c, d, a, SET(7), 0xfd469501, 22);
146 STEP(F, a, b, c, d, SET(8), 0x698098d8, 7);
147 STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12);
148 STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17);
149 STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22);
150 STEP(F, a, b, c, d, SET(12), 0x6b901122, 7);
151 STEP(F, d, a, b, c, SET(13), 0xfd987193, 12);
152 STEP(F, c, d, a, b, SET(14), 0xa679438e, 17);
153 STEP(F, b, c, d, a, SET(15), 0x49b40821, 22);
154
155 /* Round 2 */
156 STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5);
157 STEP(G, d, a, b, c, GET(6), 0xc040b340, 9);
158 STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14);
159 STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20);
160 STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5);
161 STEP(G, d, a, b, c, GET(10), 0x02441453, 9);
162 STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14);
163 STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20);
164 STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5);
165 STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9);
166 STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14);
167 STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20);
168 STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5);
169 STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9);
170 STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14);
171 STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20);
172
173 /* Round 3 */
174 STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4);
175 STEP(H2, d, a, b, c, GET(8), 0x8771f681, 11);
176 STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16);
177 STEP(H2, b, c, d, a, GET(14), 0xfde5380c, 23);
178 STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4);
179 STEP(H2, d, a, b, c, GET(4), 0x4bdecfa9, 11);
180 STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16);
181 STEP(H2, b, c, d, a, GET(10), 0xbebfbc70, 23);
182 STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4);
183 STEP(H2, d, a, b, c, GET(0), 0xeaa127fa, 11);
184 STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16);
185 STEP(H2, b, c, d, a, GET(6), 0x04881d05, 23);
186 STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4);
187 STEP(H2, d, a, b, c, GET(12), 0xe6db99e5, 11);
188 STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16);
189 STEP(H2, b, c, d, a, GET(2), 0xc4ac5665, 23);
190
191 /* Round 4 */
192 STEP(I, a, b, c, d, GET(0), 0xf4292244, 6);
193 STEP(I, d, a, b, c, GET(7), 0x432aff97, 10);
194 STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15);
195 STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21);
196 STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6);
197 STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10);
198 STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15);
199 STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21);
200 STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6);
201 STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10);
202 STEP(I, c, d, a, b, GET(6), 0xa3014314, 15);
203 STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21);
204 STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6);
205 STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10);
206 STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15);
207 STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21);
208
209 a += saved_a;
210 b += saved_b;
211 c += saved_c;
212 d += saved_d;
213
214 ptr += 64;
215 } while (size -= 64);
216
217 this->a = a;
218 this->b = b;
219 this->c = c;
220 this->d = d;
221
222 return ptr;
223 }
224
225 void MD5::InitState()
226 {
227 a = 0x67452301;
228 b = 0xefcdab89;
229 c = 0x98badcfe;
230 d = 0x10325476;
231 }
232
233 MD5::MD5()
234 : lo(0), hi(0)
235 {
236 InitState();
237 }
238
239 void MD5::Update(const void *data, size_t size)
240 {
241 uint32_t saved_lo;
242 unsigned long used, available;
243
244 saved_lo = this->lo;
245 if ((this->lo = (saved_lo + size) & 0x1fffffff) < saved_lo)
246 this->hi++;
247 this->hi += size >> 29;
248
249 used = saved_lo & 0x3f;
250
251 if (used) {
252 available = 64 - used;
253
254 if (size < available) {
255 memcpy(&this->buffer[used], data, size);
256 return;
257 }
258
259 memcpy(&this->buffer[used], data, available);
260 data = (const unsigned char *)data + available;
261 size -= available;
262 Body(this->buffer, 64);
263 }
264
265 if (size >= 64) {
266 data = Body(data, size & ~(unsigned long)0x3f);
267 size &= 0x3f;
268 }
269
270 memcpy(this->buffer, data, size);
271 }
272
273 #define OUT(dst, src) \
274 (dst)[0] = (unsigned char)(src); \
275 (dst)[1] = (unsigned char)((src) >> 8); \
276 (dst)[2] = (unsigned char)((src) >> 16); \
277 (dst)[3] = (unsigned char)((src) >> 24)
278
279 void MD5::Final(uint8_t *result)
280 {
281 unsigned long used, available;
282
283 used = this->lo & 0x3f;
284
285 this->buffer[used++] = 0x80;
286
287 available = 64 - used;
288
289 if (available < 8) {
290 memset(&this->buffer[used], 0, available);
291 Body(this->buffer, 64);
292 used = 0;
293 available = 64;
294 }
295
296 memset(&this->buffer[used], 0, available - 8);
297
298 this->lo <<= 3;
299 OUT(&this->buffer[56], this->lo);
300 OUT(&this->buffer[60], this->hi);
301
302 Body(this->buffer, 64);
303
304 OUT(&result[0], this->a);
305 OUT(&result[4], this->b);
306 OUT(&result[8], this->c);
307 OUT(&result[12], this->d);
308
309 // Clear the data.
310 lo = hi = 0;
311 InitState();
312 memset(&buffer, 0, sizeof(*buffer));
313 memset(&block, 0, sizeof(*block));
314 }
315
316 void MD5::Update(const String& input)
317 {
318 uint8_t utf8[] = { 0, 0, 0 };
319 size_t len = 0;
320
321 for (String::size_type i = 0; i < input.length(); i++)
322 {
323 // convert the string it utf-8
324 auto ch = input[i];
325 if (ch <= 0x7f)
326 {
327 utf8[0] = ch;
328 len = 1;
329 }
330 else if (ch <= 0x7ff)
331 {
332 utf8[0] = (ch & 0x3f) | 0x80;
333 utf8[1] = ((ch >> 6) & 0x1f) | 0xc0;
334 len = 2;
335 }
336 else
337 {
338 utf8[0] = (ch & 0x3f) | 0x80;
339 utf8[1] = ((ch >> 6) & 0x3f) | 0x80;
340 utf8[2] = ((ch >> 12) & 0x0f) | 0xe0;
341 len = 3;
342 }
343 // String::value_type is only 16-bits for now.
344 // Update this if we change it.
345 Update(utf8, len);
346 }
347 }
OLDNEW
« no previous file with comments | « compiled/Md5.h ('k') | compiled/String.h » ('j') | no next file with comments »

Powered by Google App Engine
This is Rietveld