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-rw-r--r--src/lib/libcrypto/poly1305/poly1305-donna.c321
1 files changed, 0 insertions, 321 deletions
diff --git a/src/lib/libcrypto/poly1305/poly1305-donna.c b/src/lib/libcrypto/poly1305/poly1305-donna.c
deleted file mode 100644
index 773ea4ebe7..0000000000
--- a/src/lib/libcrypto/poly1305/poly1305-donna.c
+++ /dev/null
@@ -1,321 +0,0 @@
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
10static inline void poly1305_init(poly1305_context *ctx,
11 const unsigned char key[32]);
12static inline void poly1305_update(poly1305_context *ctx,
13 const unsigned char *m, size_t bytes);
14static 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) */
25typedef 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 */
35static unsigned long
36U8TO32(const unsigned char *p)
37{
38 return (((unsigned long)(p[0] & 0xff)) |
39 ((unsigned long)(p[1] & 0xff) << 8) |
40 ((unsigned long)(p[2] & 0xff) << 16) |
41 ((unsigned long)(p[3] & 0xff) << 24));
42}
43
44/* store a 32 bit unsigned integer as four 8 bit unsigned integers in little endian */
45static void
46U32TO8(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}
53
54static inline void
55poly1305_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}
82
83static void
84poly1305_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 */
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) {
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 }
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}
175
176static inline void
177poly1305_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) {
184 size_t want = (poly1305_block_size - st->leftover);
185 if (want > bytes)
186 want = bytes;
187 for (i = 0; i < want; i++)
188 st->buffer[st->leftover + i] = m[i];
189 bytes -= want;
190 m += want;
191 st->leftover += want;
192 if (st->leftover < poly1305_block_size)
193 return;
194 poly1305_blocks(st, st->buffer, poly1305_block_size);
195 st->leftover = 0;
196 }
197
198 /* process full blocks */
199 if (bytes >= poly1305_block_size) {
200 size_t want = (bytes & ~(poly1305_block_size - 1));
201 poly1305_blocks(st, m, want);
202 m += want;
203 bytes -= want;
204 }
205
206 /* store leftover */
207 if (bytes) {
208 for (i = 0; i < bytes; i++)
209 st->buffer[st->leftover + i] = m[i];
210 st->leftover += bytes;
211 }
212}
213
214static inline void
215poly1305_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) {
225 size_t i = st->leftover;
226 st->buffer[i++] = 1;
227 for (; i < poly1305_block_size; i++)
228 st->buffer[i] = 0;
229 st->final = 1;
230 poly1305_blocks(st, st->buffer, poly1305_block_size);
231 }
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}
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