Absolute File Name: | /home/opencoverage/opencoverage/guest-scripts/libressl/src/crypto/poly1305/poly1305-donna.c |
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1 | /* $OpenBSD: poly1305-donna.c,v 1.3 2014/06/12 15:49:30 deraadt Exp $ */ | - | ||||||
2 | /* | - | ||||||
3 | * Public Domain poly1305 from Andrew Moon | - | ||||||
4 | * Based on poly1305-donna.c, poly1305-donna-32.h and poly1305-donna.h from: | - | ||||||
5 | * https://github.com/floodyberry/poly1305-donna | - | ||||||
6 | */ | - | ||||||
7 | - | |||||||
8 | #include <stddef.h> | - | ||||||
9 | - | |||||||
10 | static inline void poly1305_init(poly1305_context *ctx, | - | ||||||
11 | const unsigned char key[32]); | - | ||||||
12 | static inline void poly1305_update(poly1305_context *ctx, | - | ||||||
13 | const unsigned char *m, size_t bytes); | - | ||||||
14 | static inline void poly1305_finish(poly1305_context *ctx, | - | ||||||
15 | unsigned char mac[16]); | - | ||||||
16 | - | |||||||
17 | /* | - | ||||||
18 | * poly1305 implementation using 32 bit * 32 bit = 64 bit multiplication | - | ||||||
19 | * and 64 bit addition. | - | ||||||
20 | */ | - | ||||||
21 | - | |||||||
22 | #define poly1305_block_size 16 | - | ||||||
23 | - | |||||||
24 | /* 17 + sizeof(size_t) + 14*sizeof(unsigned long) */ | - | ||||||
25 | typedef struct poly1305_state_internal_t { | - | ||||||
26 | unsigned long r[5]; | - | ||||||
27 | unsigned long h[5]; | - | ||||||
28 | unsigned long pad[4]; | - | ||||||
29 | size_t leftover; | - | ||||||
30 | unsigned char buffer[poly1305_block_size]; | - | ||||||
31 | unsigned char final; | - | ||||||
32 | } poly1305_state_internal_t; | - | ||||||
33 | - | |||||||
34 | /* interpret four 8 bit unsigned integers as a 32 bit unsigned integer in little endian */ | - | ||||||
35 | static unsigned long | - | ||||||
36 | U8TO32(const unsigned char *p) | - | ||||||
37 | { | - | ||||||
38 | return (((unsigned long)(p[0] & 0xff)) | executed 22834 times by 4 tests: return (((unsigned long)(p[0] & 0xff)) | ((unsigned long)(p[1] & 0xff) << 8) | ((unsigned long)(p[2] & 0xff) << 16) | ((unsigned long)(p[3] & 0xff) << 24)); Executed by:
| 22834 | ||||||
39 | ((unsigned long)(p[1] & 0xff) << 8) | executed 22834 times by 4 tests: return (((unsigned long)(p[0] & 0xff)) | ((unsigned long)(p[1] & 0xff) << 8) | ((unsigned long)(p[2] & 0xff) << 16) | ((unsigned long)(p[3] & 0xff) << 24)); Executed by:
| 22834 | ||||||
40 | ((unsigned long)(p[2] & 0xff) << 16) | executed 22834 times by 4 tests: return (((unsigned long)(p[0] & 0xff)) | ((unsigned long)(p[1] & 0xff) << 8) | ((unsigned long)(p[2] & 0xff) << 16) | ((unsigned long)(p[3] & 0xff) << 24)); Executed by:
| 22834 | ||||||
41 | ((unsigned long)(p[3] & 0xff) << 24)); executed 22834 times by 4 tests: return (((unsigned long)(p[0] & 0xff)) | ((unsigned long)(p[1] & 0xff) << 8) | ((unsigned long)(p[2] & 0xff) << 16) | ((unsigned long)(p[3] & 0xff) << 24)); Executed by:
| 22834 | ||||||
42 | } | - | ||||||
43 | - | |||||||
44 | /* store a 32 bit unsigned integer as four 8 bit unsigned integers in little endian */ | - | ||||||
45 | static void | - | ||||||
46 | U32TO8(unsigned char *p, unsigned long v) | - | ||||||
47 | { | - | ||||||
48 | p[0] = (v) & 0xff; | - | ||||||
49 | p[1] = (v >> 8) & 0xff; | - | ||||||
50 | p[2] = (v >> 16) & 0xff; | - | ||||||
51 | p[3] = (v >> 24) & 0xff; | - | ||||||
52 | } executed 1704 times by 4 tests: end of block Executed by:
| 1704 | ||||||
53 | - | |||||||
54 | static inline void | - | ||||||
55 | poly1305_init(poly1305_context *ctx, const unsigned char key[32]) | - | ||||||
56 | { | - | ||||||
57 | poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx; | - | ||||||
58 | - | |||||||
59 | /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */ | - | ||||||
60 | st->r[0] = (U8TO32(&key[0])) & 0x3ffffff; | - | ||||||
61 | st->r[1] = (U8TO32(&key[3]) >> 2) & 0x3ffff03; | - | ||||||
62 | st->r[2] = (U8TO32(&key[6]) >> 4) & 0x3ffc0ff; | - | ||||||
63 | st->r[3] = (U8TO32(&key[9]) >> 6) & 0x3f03fff; | - | ||||||
64 | st->r[4] = (U8TO32(&key[12]) >> 8) & 0x00fffff; | - | ||||||
65 | - | |||||||
66 | /* h = 0 */ | - | ||||||
67 | st->h[0] = 0; | - | ||||||
68 | st->h[1] = 0; | - | ||||||
69 | st->h[2] = 0; | - | ||||||
70 | st->h[3] = 0; | - | ||||||
71 | st->h[4] = 0; | - | ||||||
72 | - | |||||||
73 | /* save pad for later */ | - | ||||||
74 | st->pad[0] = U8TO32(&key[16]); | - | ||||||
75 | st->pad[1] = U8TO32(&key[20]); | - | ||||||
76 | st->pad[2] = U8TO32(&key[24]); | - | ||||||
77 | st->pad[3] = U8TO32(&key[28]); | - | ||||||
78 | - | |||||||
79 | st->leftover = 0; | - | ||||||
80 | st->final = 0; | - | ||||||
81 | } executed 426 times by 4 tests: end of block Executed by:
| 426 | ||||||
82 | - | |||||||
83 | static void | - | ||||||
84 | poly1305_blocks(poly1305_state_internal_t *st, const unsigned char *m, size_t bytes) | - | ||||||
85 | { | - | ||||||
86 | const unsigned long hibit = (st->final) ? 0 : (1 << 24); /* 1 << 128 */
| 242-1009 | ||||||
87 | unsigned long r0, r1, r2, r3, r4; | - | ||||||
88 | unsigned long s1, s2, s3, s4; | - | ||||||
89 | unsigned long h0, h1, h2, h3, h4; | - | ||||||
90 | unsigned long long d0, d1, d2, d3, d4; | - | ||||||
91 | unsigned long c; | - | ||||||
92 | - | |||||||
93 | r0 = st->r[0]; | - | ||||||
94 | r1 = st->r[1]; | - | ||||||
95 | r2 = st->r[2]; | - | ||||||
96 | r3 = st->r[3]; | - | ||||||
97 | r4 = st->r[4]; | - | ||||||
98 | - | |||||||
99 | s1 = r1 * 5; | - | ||||||
100 | s2 = r2 * 5; | - | ||||||
101 | s3 = r3 * 5; | - | ||||||
102 | s4 = r4 * 5; | - | ||||||
103 | - | |||||||
104 | h0 = st->h[0]; | - | ||||||
105 | h1 = st->h[1]; | - | ||||||
106 | h2 = st->h[2]; | - | ||||||
107 | h3 = st->h[3]; | - | ||||||
108 | h4 = st->h[4]; | - | ||||||
109 | - | |||||||
110 | while (bytes >= poly1305_block_size) {
| 1251-3800 | ||||||
111 | /* h += m[i] */ | - | ||||||
112 | h0 += (U8TO32(m + 0)) & 0x3ffffff; | - | ||||||
113 | h1 += (U8TO32(m + 3) >> 2) & 0x3ffffff; | - | ||||||
114 | h2 += (U8TO32(m + 6) >> 4) & 0x3ffffff; | - | ||||||
115 | h3 += (U8TO32(m + 9) >> 6) & 0x3ffffff; | - | ||||||
116 | h4 += (U8TO32(m + 12) >> 8) | hibit; | - | ||||||
117 | - | |||||||
118 | /* h *= r */ | - | ||||||
119 | d0 = ((unsigned long long)h0 * r0) + | - | ||||||
120 | ((unsigned long long)h1 * s4) + | - | ||||||
121 | ((unsigned long long)h2 * s3) + | - | ||||||
122 | ((unsigned long long)h3 * s2) + | - | ||||||
123 | ((unsigned long long)h4 * s1); | - | ||||||
124 | d1 = ((unsigned long long)h0 * r1) + | - | ||||||
125 | ((unsigned long long)h1 * r0) + | - | ||||||
126 | ((unsigned long long)h2 * s4) + | - | ||||||
127 | ((unsigned long long)h3 * s3) + | - | ||||||
128 | ((unsigned long long)h4 * s2); | - | ||||||
129 | d2 = ((unsigned long long)h0 * r2) + | - | ||||||
130 | ((unsigned long long)h1 * r1) + | - | ||||||
131 | ((unsigned long long)h2 * r0) + | - | ||||||
132 | ((unsigned long long)h3 * s4) + | - | ||||||
133 | ((unsigned long long)h4 * s3); | - | ||||||
134 | d3 = ((unsigned long long)h0 * r3) + | - | ||||||
135 | ((unsigned long long)h1 * r2) + | - | ||||||
136 | ((unsigned long long)h2 * r1) + | - | ||||||
137 | ((unsigned long long)h3 * r0) + | - | ||||||
138 | ((unsigned long long)h4 * s4); | - | ||||||
139 | d4 = ((unsigned long long)h0 * r4) + | - | ||||||
140 | ((unsigned long long)h1 * r3) + | - | ||||||
141 | ((unsigned long long)h2 * r2) + | - | ||||||
142 | ((unsigned long long)h3 * r1) + | - | ||||||
143 | ((unsigned long long)h4 * r0); | - | ||||||
144 | - | |||||||
145 | /* (partial) h %= p */ | - | ||||||
146 | c = (unsigned long)(d0 >> 26); | - | ||||||
147 | h0 = (unsigned long)d0 & 0x3ffffff; | - | ||||||
148 | d1 += c; | - | ||||||
149 | c = (unsigned long)(d1 >> 26); | - | ||||||
150 | h1 = (unsigned long)d1 & 0x3ffffff; | - | ||||||
151 | d2 += c; | - | ||||||
152 | c = (unsigned long)(d2 >> 26); | - | ||||||
153 | h2 = (unsigned long)d2 & 0x3ffffff; | - | ||||||
154 | d3 += c; | - | ||||||
155 | c = (unsigned long)(d3 >> 26); | - | ||||||
156 | h3 = (unsigned long)d3 & 0x3ffffff; | - | ||||||
157 | d4 += c; | - | ||||||
158 | c = (unsigned long)(d4 >> 26); | - | ||||||
159 | h4 = (unsigned long)d4 & 0x3ffffff; | - | ||||||
160 | h0 += c * 5; | - | ||||||
161 | c = (h0 >> 26); | - | ||||||
162 | h0 = h0 & 0x3ffffff; | - | ||||||
163 | h1 += c; | - | ||||||
164 | - | |||||||
165 | m += poly1305_block_size; | - | ||||||
166 | bytes -= poly1305_block_size; | - | ||||||
167 | } executed 3800 times by 4 tests: end of block Executed by:
| 3800 | ||||||
168 | - | |||||||
169 | st->h[0] = h0; | - | ||||||
170 | st->h[1] = h1; | - | ||||||
171 | st->h[2] = h2; | - | ||||||
172 | st->h[3] = h3; | - | ||||||
173 | st->h[4] = h4; | - | ||||||
174 | } executed 1251 times by 4 tests: end of block Executed by:
| 1251 | ||||||
175 | - | |||||||
176 | static inline void | - | ||||||
177 | poly1305_update(poly1305_context *ctx, const unsigned char *m, size_t bytes) | - | ||||||
178 | { | - | ||||||
179 | poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx; | - | ||||||
180 | size_t i; | - | ||||||
181 | - | |||||||
182 | /* handle leftover */ | - | ||||||
183 | if (st->leftover) {
| 381-1017 | ||||||
184 | size_t want = (poly1305_block_size - st->leftover); | - | ||||||
185 | if (want > bytes)
| 5-376 | ||||||
186 | want = bytes; executed 5 times by 1 test: want = bytes; Executed by:
| 5 | ||||||
187 | for (i = 0; i < want; i++)
| 381-2420 | ||||||
188 | st->buffer[st->leftover + i] = m[i]; executed 2420 times by 4 tests: st->buffer[st->leftover + i] = m[i]; Executed by:
| 2420 | ||||||
189 | bytes -= want; | - | ||||||
190 | m += want; | - | ||||||
191 | st->leftover += want; | - | ||||||
192 | if (st->leftover < poly1305_block_size)
| 5-376 | ||||||
193 | return; executed 5 times by 1 test: return; Executed by:
| 5 | ||||||
194 | poly1305_blocks(st, st->buffer, poly1305_block_size); | - | ||||||
195 | st->leftover = 0; | - | ||||||
196 | } executed 376 times by 4 tests: end of block Executed by:
| 376 | ||||||
197 | - | |||||||
198 | /* process full blocks */ | - | ||||||
199 | if (bytes >= poly1305_block_size) {
| 633-760 | ||||||
200 | size_t want = (bytes & ~(poly1305_block_size - 1)); | - | ||||||
201 | poly1305_blocks(st, m, want); | - | ||||||
202 | m += want; | - | ||||||
203 | bytes -= want; | - | ||||||
204 | } executed 633 times by 4 tests: end of block Executed by:
| 633 | ||||||
205 | - | |||||||
206 | /* store leftover */ | - | ||||||
207 | if (bytes) {
| 618-775 | ||||||
208 | for (i = 0; i < bytes; i++)
| 618-5522 | ||||||
209 | st->buffer[st->leftover + i] = m[i]; executed 5522 times by 4 tests: st->buffer[st->leftover + i] = m[i]; Executed by:
| 5522 | ||||||
210 | st->leftover += bytes; | - | ||||||
211 | } executed 618 times by 4 tests: end of block Executed by:
| 618 | ||||||
212 | } executed 1393 times by 4 tests: end of block Executed by:
| 1393 | ||||||
213 | - | |||||||
214 | static inline void | - | ||||||
215 | poly1305_finish(poly1305_context *ctx, unsigned char mac[16]) | - | ||||||
216 | { | - | ||||||
217 | poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx; | - | ||||||
218 | unsigned long h0, h1, h2, h3, h4, c; | - | ||||||
219 | unsigned long g0, g1, g2, g3, g4; | - | ||||||
220 | unsigned long long f; | - | ||||||
221 | unsigned long mask; | - | ||||||
222 | - | |||||||
223 | /* process the remaining block */ | - | ||||||
224 | if (st->leftover) {
| 184-242 | ||||||
225 | size_t i = st->leftover; | - | ||||||
226 | st->buffer[i++] = 1; | - | ||||||
227 | for (; i < poly1305_block_size; i++)
| 242-1704 | ||||||
228 | st->buffer[i] = 0; executed 1704 times by 1 test: st->buffer[i] = 0; Executed by:
| 1704 | ||||||
229 | st->final = 1; | - | ||||||
230 | poly1305_blocks(st, st->buffer, poly1305_block_size); | - | ||||||
231 | } executed 242 times by 1 test: end of block Executed by:
| 242 | ||||||
232 | - | |||||||
233 | /* fully carry h */ | - | ||||||
234 | h0 = st->h[0]; | - | ||||||
235 | h1 = st->h[1]; | - | ||||||
236 | h2 = st->h[2]; | - | ||||||
237 | h3 = st->h[3]; | - | ||||||
238 | h4 = st->h[4]; | - | ||||||
239 | - | |||||||
240 | c = h1 >> 26; | - | ||||||
241 | h1 = h1 & 0x3ffffff; | - | ||||||
242 | h2 += c; | - | ||||||
243 | c = h2 >> 26; | - | ||||||
244 | h2 = h2 & 0x3ffffff; | - | ||||||
245 | h3 += c; | - | ||||||
246 | c = h3 >> 26; | - | ||||||
247 | h3 = h3 & 0x3ffffff; | - | ||||||
248 | h4 += c; | - | ||||||
249 | c = h4 >> 26; | - | ||||||
250 | h4 = h4 & 0x3ffffff; | - | ||||||
251 | h0 += c * 5; | - | ||||||
252 | c = h0 >> 26; | - | ||||||
253 | h0 = h0 & 0x3ffffff; | - | ||||||
254 | h1 += c; | - | ||||||
255 | - | |||||||
256 | /* compute h + -p */ | - | ||||||
257 | g0 = h0 + 5; | - | ||||||
258 | c = g0 >> 26; | - | ||||||
259 | g0 &= 0x3ffffff; | - | ||||||
260 | g1 = h1 + c; | - | ||||||
261 | c = g1 >> 26; | - | ||||||
262 | g1 &= 0x3ffffff; | - | ||||||
263 | g2 = h2 + c; | - | ||||||
264 | c = g2 >> 26; | - | ||||||
265 | g2 &= 0x3ffffff; | - | ||||||
266 | g3 = h3 + c; | - | ||||||
267 | c = g3 >> 26; | - | ||||||
268 | g3 &= 0x3ffffff; | - | ||||||
269 | g4 = h4 + c - (1 << 26); | - | ||||||
270 | - | |||||||
271 | /* select h if h < p, or h + -p if h >= p */ | - | ||||||
272 | mask = (g4 >> ((sizeof(unsigned long) * 8) - 1)) - 1; | - | ||||||
273 | g0 &= mask; | - | ||||||
274 | g1 &= mask; | - | ||||||
275 | g2 &= mask; | - | ||||||
276 | g3 &= mask; | - | ||||||
277 | g4 &= mask; | - | ||||||
278 | mask = ~mask; | - | ||||||
279 | h0 = (h0 & mask) | g0; | - | ||||||
280 | h1 = (h1 & mask) | g1; | - | ||||||
281 | h2 = (h2 & mask) | g2; | - | ||||||
282 | h3 = (h3 & mask) | g3; | - | ||||||
283 | h4 = (h4 & mask) | g4; | - | ||||||
284 | - | |||||||
285 | /* h = h % (2^128) */ | - | ||||||
286 | h0 = ((h0) | (h1 << 26)) & 0xffffffff; | - | ||||||
287 | h1 = ((h1 >> 6) | (h2 << 20)) & 0xffffffff; | - | ||||||
288 | h2 = ((h2 >> 12) | (h3 << 14)) & 0xffffffff; | - | ||||||
289 | h3 = ((h3 >> 18) | (h4 << 8)) & 0xffffffff; | - | ||||||
290 | - | |||||||
291 | /* mac = (h + pad) % (2^128) */ | - | ||||||
292 | f = (unsigned long long)h0 + st->pad[0]; | - | ||||||
293 | h0 = (unsigned long)f; | - | ||||||
294 | f = (unsigned long long)h1 + st->pad[1] + (f >> 32); | - | ||||||
295 | h1 = (unsigned long)f; | - | ||||||
296 | f = (unsigned long long)h2 + st->pad[2] + (f >> 32); | - | ||||||
297 | h2 = (unsigned long)f; | - | ||||||
298 | f = (unsigned long long)h3 + st->pad[3] + (f >> 32); | - | ||||||
299 | h3 = (unsigned long)f; | - | ||||||
300 | - | |||||||
301 | U32TO8(mac + 0, h0); | - | ||||||
302 | U32TO8(mac + 4, h1); | - | ||||||
303 | U32TO8(mac + 8, h2); | - | ||||||
304 | U32TO8(mac + 12, h3); | - | ||||||
305 | - | |||||||
306 | /* zero out the state */ | - | ||||||
307 | st->h[0] = 0; | - | ||||||
308 | st->h[1] = 0; | - | ||||||
309 | st->h[2] = 0; | - | ||||||
310 | st->h[3] = 0; | - | ||||||
311 | st->h[4] = 0; | - | ||||||
312 | st->r[0] = 0; | - | ||||||
313 | st->r[1] = 0; | - | ||||||
314 | st->r[2] = 0; | - | ||||||
315 | st->r[3] = 0; | - | ||||||
316 | st->r[4] = 0; | - | ||||||
317 | st->pad[0] = 0; | - | ||||||
318 | st->pad[1] = 0; | - | ||||||
319 | st->pad[2] = 0; | - | ||||||
320 | st->pad[3] = 0; | - | ||||||
321 | } executed 426 times by 4 tests: end of block Executed by:
| 426 | ||||||
Source code | Switch to Preprocessed file |