Mercurial > hg > nginx
annotate src/core/ngx_md5.c @ 4104:84f34973684c
Version bump.
author | Igor Sysoev <igor@sysoev.ru> |
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date | Wed, 14 Sep 2011 15:20:01 +0000 |
parents | ce1ba4a312d7 |
children | 21167183825d |
rev | line source |
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3895 | 1 |
2 /* | |
3 * An internal implementation, based on Alexander Peslyak's | |
4 * public domain implementation: | |
5 * http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5 | |
6 * It is not expected to be optimal and is used only | |
7 * if no MD5 implementation was found in system. | |
8 */ | |
9 | |
10 | |
11 #include <ngx_config.h> | |
12 #include <ngx_core.h> | |
13 #include <ngx_md5.h> | |
14 | |
15 | |
16 #if !(NGX_HAVE_MD5) | |
17 | |
18 static const u_char *ngx_md5_body(ngx_md5_t *ctx, const u_char *data, | |
19 size_t size); | |
20 | |
21 | |
22 void | |
23 ngx_md5_init(ngx_md5_t *ctx) | |
24 { | |
25 ctx->a = 0x67452301; | |
26 ctx->b = 0xefcdab89; | |
27 ctx->c = 0x98badcfe; | |
28 ctx->d = 0x10325476; | |
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29 |
3895 | 30 ctx->bytes = 0; |
31 } | |
32 | |
33 | |
34 void | |
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35 ngx_md5_update(ngx_md5_t *ctx, const void *data, size_t size) |
3895 | 36 { |
37 size_t used, free; | |
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38 |
3941 | 39 used = (size_t) (ctx->bytes & 0x3f); |
3895 | 40 ctx->bytes += size; |
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41 |
3895 | 42 if (used) { |
43 free = 64 - used; | |
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44 |
3895 | 45 if (size < free) { |
46 ngx_memcpy(&ctx->buffer[used], data, size); | |
47 return; | |
48 } | |
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49 |
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50 data = ngx_cpymem(&ctx->buffer[used], data, free); |
3895 | 51 size -= free; |
52 (void) ngx_md5_body(ctx, ctx->buffer, 64); | |
53 } | |
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54 |
3895 | 55 if (size >= 64) { |
56 data = ngx_md5_body(ctx, data, size & ~(size_t) 0x3f); | |
57 size &= 0x3f; | |
58 } | |
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59 |
3895 | 60 ngx_memcpy(ctx->buffer, data, size); |
61 } | |
62 | |
63 | |
64 void | |
65 ngx_md5_final(u_char result[16], ngx_md5_t *ctx) | |
66 { | |
67 size_t used, free; | |
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68 |
3941 | 69 used = (size_t) (ctx->bytes & 0x3f); |
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70 |
3895 | 71 ctx->buffer[used++] = 0x80; |
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72 |
3895 | 73 free = 64 - used; |
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74 |
3895 | 75 if (free < 8) { |
76 ngx_memzero(&ctx->buffer[used], free); | |
77 (void) ngx_md5_body(ctx, ctx->buffer, 64); | |
78 used = 0; | |
79 free = 64; | |
80 } | |
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81 |
3895 | 82 ngx_memzero(&ctx->buffer[used], free - 8); |
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83 |
3895 | 84 ctx->bytes <<= 3; |
3941 | 85 ctx->buffer[56] = (u_char) ctx->bytes; |
86 ctx->buffer[57] = (u_char) (ctx->bytes >> 8); | |
87 ctx->buffer[58] = (u_char) (ctx->bytes >> 16); | |
88 ctx->buffer[59] = (u_char) (ctx->bytes >> 24); | |
89 ctx->buffer[60] = (u_char) (ctx->bytes >> 32); | |
90 ctx->buffer[61] = (u_char) (ctx->bytes >> 40); | |
91 ctx->buffer[62] = (u_char) (ctx->bytes >> 48); | |
92 ctx->buffer[63] = (u_char) (ctx->bytes >> 56); | |
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93 |
3895 | 94 (void) ngx_md5_body(ctx, ctx->buffer, 64); |
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95 |
3941 | 96 result[0] = (u_char) ctx->a; |
97 result[1] = (u_char) (ctx->a >> 8); | |
98 result[2] = (u_char) (ctx->a >> 16); | |
99 result[3] = (u_char) (ctx->a >> 24); | |
100 result[4] = (u_char) ctx->b; | |
101 result[5] = (u_char) (ctx->b >> 8); | |
102 result[6] = (u_char) (ctx->b >> 16); | |
103 result[7] = (u_char) (ctx->b >> 24); | |
104 result[8] = (u_char) ctx->c; | |
105 result[9] = (u_char) (ctx->c >> 8); | |
106 result[10] = (u_char) (ctx->c >> 16); | |
107 result[11] = (u_char) (ctx->c >> 24); | |
108 result[12] = (u_char) ctx->d; | |
109 result[13] = (u_char) (ctx->d >> 8); | |
110 result[14] = (u_char) (ctx->d >> 16); | |
111 result[15] = (u_char) (ctx->d >> 24); | |
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112 |
3895 | 113 ngx_memzero(ctx, sizeof(*ctx)); |
114 } | |
115 | |
116 | |
117 /* | |
118 * The basic MD5 functions. | |
119 * | |
120 * F and G are optimized compared to their RFC 1321 definitions for | |
121 * architectures that lack an AND-NOT instruction, just like in | |
122 * Colin Plumb's implementation. | |
123 */ | |
124 | |
125 #define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z)))) | |
126 #define G(x, y, z) ((y) ^ ((z) & ((x) ^ (y)))) | |
127 #define H(x, y, z) ((x) ^ (y) ^ (z)) | |
128 #define I(x, y, z) ((y) ^ ((x) | ~(z))) | |
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129 |
3895 | 130 /* |
131 * The MD5 transformation for all four rounds. | |
132 */ | |
133 | |
134 #define STEP(f, a, b, c, d, x, t, s) \ | |
135 (a) += f((b), (c), (d)) + (x) + (t); \ | |
136 (a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \ | |
137 (a) += (b) | |
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138 |
3895 | 139 /* |
140 * SET() reads 4 input bytes in little-endian byte order and stores them | |
141 * in a properly aligned word in host byte order. | |
142 * | |
143 * The check for little-endian architectures that tolerate unaligned | |
144 * memory accesses is just an optimization. Nothing will break if it | |
145 * does not work. | |
146 */ | |
147 | |
148 #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED) | |
149 | |
150 #define SET(n) (*(uint32_t *) &p[n * 4]) | |
151 #define GET(n) (*(uint32_t *) &p[n * 4]) | |
152 | |
153 #else | |
154 | |
155 #define SET(n) \ | |
156 (block[n] = \ | |
157 (uint32_t) p[n * 4] | \ | |
158 ((uint32_t) p[n * 4 + 1] << 8) | \ | |
159 ((uint32_t) p[n * 4 + 2] << 16) | \ | |
160 ((uint32_t) p[n * 4 + 3] << 24)) | |
161 | |
162 #define GET(n) block[n] | |
163 | |
164 #endif | |
165 | |
166 | |
167 /* | |
168 * This processes one or more 64-byte data blocks, but does not update | |
169 * the bit counters. There are no alignment requirements. | |
170 */ | |
171 | |
172 static const u_char * | |
173 ngx_md5_body(ngx_md5_t *ctx, const u_char *data, size_t size) | |
174 { | |
175 uint32_t a, b, c, d; | |
176 uint32_t saved_a, saved_b, saved_c, saved_d; | |
177 const u_char *p; | |
178 #if !(NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED) | |
179 uint32_t block[16]; | |
180 #endif | |
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181 |
3895 | 182 p = data; |
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183 |
3895 | 184 a = ctx->a; |
185 b = ctx->b; | |
186 c = ctx->c; | |
187 d = ctx->d; | |
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188 |
3895 | 189 do { |
190 saved_a = a; | |
191 saved_b = b; | |
192 saved_c = c; | |
193 saved_d = d; | |
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194 |
3895 | 195 /* Round 1 */ |
196 | |
197 STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7); | |
198 STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12); | |
199 STEP(F, c, d, a, b, SET(2), 0x242070db, 17); | |
200 STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22); | |
201 STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7); | |
202 STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12); | |
203 STEP(F, c, d, a, b, SET(6), 0xa8304613, 17); | |
204 STEP(F, b, c, d, a, SET(7), 0xfd469501, 22); | |
205 STEP(F, a, b, c, d, SET(8), 0x698098d8, 7); | |
206 STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12); | |
207 STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17); | |
208 STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22); | |
209 STEP(F, a, b, c, d, SET(12), 0x6b901122, 7); | |
210 STEP(F, d, a, b, c, SET(13), 0xfd987193, 12); | |
211 STEP(F, c, d, a, b, SET(14), 0xa679438e, 17); | |
212 STEP(F, b, c, d, a, SET(15), 0x49b40821, 22); | |
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213 |
3895 | 214 /* Round 2 */ |
215 | |
216 STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5); | |
217 STEP(G, d, a, b, c, GET(6), 0xc040b340, 9); | |
218 STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14); | |
219 STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20); | |
220 STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5); | |
221 STEP(G, d, a, b, c, GET(10), 0x02441453, 9); | |
222 STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14); | |
223 STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20); | |
224 STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5); | |
225 STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9); | |
226 STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14); | |
227 STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20); | |
228 STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5); | |
229 STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9); | |
230 STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14); | |
231 STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20); | |
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232 |
3895 | 233 /* Round 3 */ |
234 | |
235 STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4); | |
236 STEP(H, d, a, b, c, GET(8), 0x8771f681, 11); | |
237 STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16); | |
238 STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23); | |
239 STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4); | |
240 STEP(H, d, a, b, c, GET(4), 0x4bdecfa9, 11); | |
241 STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16); | |
242 STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23); | |
243 STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4); | |
244 STEP(H, d, a, b, c, GET(0), 0xeaa127fa, 11); | |
245 STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16); | |
246 STEP(H, b, c, d, a, GET(6), 0x04881d05, 23); | |
247 STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4); | |
248 STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11); | |
249 STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16); | |
250 STEP(H, b, c, d, a, GET(2), 0xc4ac5665, 23); | |
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251 |
3895 | 252 /* Round 4 */ |
253 | |
254 STEP(I, a, b, c, d, GET(0), 0xf4292244, 6); | |
255 STEP(I, d, a, b, c, GET(7), 0x432aff97, 10); | |
256 STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15); | |
257 STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21); | |
258 STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6); | |
259 STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10); | |
260 STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15); | |
261 STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21); | |
262 STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6); | |
263 STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10); | |
264 STEP(I, c, d, a, b, GET(6), 0xa3014314, 15); | |
265 STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21); | |
266 STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6); | |
267 STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10); | |
268 STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15); | |
269 STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21); | |
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270 |
3895 | 271 a += saved_a; |
272 b += saved_b; | |
273 c += saved_c; | |
274 d += saved_d; | |
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275 |
3895 | 276 p += 64; |
277 | |
278 } while (size -= 64); | |
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279 |
3895 | 280 ctx->a = a; |
281 ctx->b = b; | |
282 ctx->c = c; | |
283 ctx->d = d; | |
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284 |
3895 | 285 return p; |
286 } | |
287 | |
288 #endif |