1 /******************************************************************************
2 * Filename: sw_poly1305-donna.c
3 ******************************************************************************/
4
5 #include "sw_poly1305-donna.h"
6
7 #include "sw_poly1305-donna-32.h"
8
poly1305_update(poly1305_context * ctx,const unsigned char * m,size_t bytes)9 void poly1305_update(poly1305_context *ctx, const unsigned char *m, size_t bytes)
10 {
11 poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx;
12 size_t i;
13
14 /* handle leftover */
15 if (st->leftover)
16 {
17 size_t want = (poly1305_block_size - st->leftover);
18 if (want > bytes)
19 {
20 want = bytes;
21 }
22 for (i = 0; i < want; i++)
23 {
24 st->buffer[st->leftover + i] = m[i];
25 }
26 bytes -= want;
27 m += want;
28 st->leftover += want;
29 if (st->leftover < poly1305_block_size)
30 {
31 return;
32 }
33 poly1305_blocks(st, st->buffer, poly1305_block_size);
34 st->leftover = 0;
35 }
36
37 /* process full blocks */
38 if (bytes >= poly1305_block_size)
39 {
40 size_t want = (bytes & ~(poly1305_block_size - 1));
41 poly1305_blocks(st, m, want);
42 m += want;
43 bytes -= want;
44 }
45
46 /* store leftover */
47 if (bytes)
48 {
49 for (i = 0; i < bytes; i++)
50 {
51 st->buffer[st->leftover + i] = m[i];
52 }
53 st->leftover += bytes;
54 }
55 }
56
poly1305_auth(unsigned char mac[16],const unsigned char * m,size_t bytes,const unsigned char key[32])57 void poly1305_auth(unsigned char mac[16], const unsigned char *m, size_t bytes, const unsigned char key[32])
58 {
59 poly1305_context ctx;
60 poly1305_init(&ctx, key);
61 poly1305_update(&ctx, m, bytes);
62 poly1305_finish(&ctx, mac);
63 }
64
poly1305_verify(const unsigned char mac1[16],const unsigned char mac2[16])65 int poly1305_verify(const unsigned char mac1[16], const unsigned char mac2[16])
66 {
67 size_t i;
68 unsigned int dif = 0;
69 for (i = 0; i < 16; i++)
70 {
71 dif |= (mac1[i] ^ mac2[i]);
72 }
73 dif = (dif - 1) >> ((sizeof(unsigned int) * 8) - 1);
74 return (dif & 1);
75 }
76
77 /* test a few basic operations */
poly1305_power_on_self_test(void)78 int poly1305_power_on_self_test(void)
79 {
80 /* example from nacl */
81 static const unsigned char nacl_key[32] = {0xee, 0xa6, 0xa7, 0x25, 0x1c, 0x1e, 0x72, 0x91, 0x6d, 0x11, 0xc2,
82 0xcb, 0x21, 0x4d, 0x3c, 0x25, 0x25, 0x39, 0x12, 0x1d, 0x8e, 0x23,
83 0x4e, 0x65, 0x2d, 0x65, 0x1f, 0xa4, 0xc8, 0xcf, 0xf8, 0x80};
84
85 static const unsigned char nacl_msg[131] = {0x8e, 0x99, 0x3b, 0x9f, 0x48, 0x68, 0x12, 0x73, 0xc2, 0x96, 0x50, 0xba,
86 0x32, 0xfc, 0x76, 0xce, 0x48, 0x33, 0x2e, 0xa7, 0x16, 0x4d, 0x96, 0xa4,
87 0x47, 0x6f, 0xb8, 0xc5, 0x31, 0xa1, 0x18, 0x6a, 0xc0, 0xdf, 0xc1, 0x7c,
88 0x98, 0xdc, 0xe8, 0x7b, 0x4d, 0xa7, 0xf0, 0x11, 0xec, 0x48, 0xc9, 0x72,
89 0x71, 0xd2, 0xc2, 0x0f, 0x9b, 0x92, 0x8f, 0xe2, 0x27, 0x0d, 0x6f, 0xb8,
90 0x63, 0xd5, 0x17, 0x38, 0xb4, 0x8e, 0xee, 0xe3, 0x14, 0xa7, 0xcc, 0x8a,
91 0xb9, 0x32, 0x16, 0x45, 0x48, 0xe5, 0x26, 0xae, 0x90, 0x22, 0x43, 0x68,
92 0x51, 0x7a, 0xcf, 0xea, 0xbd, 0x6b, 0xb3, 0x73, 0x2b, 0xc0, 0xe9, 0xda,
93 0x99, 0x83, 0x2b, 0x61, 0xca, 0x01, 0xb6, 0xde, 0x56, 0x24, 0x4a, 0x9e,
94 0x88, 0xd5, 0xf9, 0xb3, 0x79, 0x73, 0xf6, 0x22, 0xa4, 0x3d, 0x14, 0xa6,
95 0x59, 0x9b, 0x1f, 0x65, 0x4c, 0xb4, 0x5a, 0x74, 0xe3, 0x55, 0xa5};
96
97 static const unsigned char nacl_mac[16] =
98 {0xf3, 0xff, 0xc7, 0x70, 0x3f, 0x94, 0x00, 0xe5, 0x2a, 0x7d, 0xfb, 0x4b, 0x3d, 0x33, 0x05, 0xd9};
99
100 /* generates a final value of (2^130 - 2) == 3 */
101 static const unsigned char wrap_key[32] = {0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
102 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
103 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
104
105 static const unsigned char wrap_msg[16] =
106 {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
107
108 static const unsigned char wrap_mac[16] =
109 {0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
110
111 /*
112 mac of the macs of messages of length 0 to 256, where the key and messages
113 have all their values set to the length
114 */
115 static const unsigned char total_key[32] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0xff, 0xfe, 0xfd,
116 0xfc, 0xfb, 0xfa, 0xf9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
117 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
118
119 static const unsigned char total_mac[16] =
120 {0x64, 0xaf, 0xe2, 0xe8, 0xd6, 0xad, 0x7b, 0xbd, 0xd2, 0x87, 0xf9, 0x7c, 0x44, 0x62, 0x3d, 0x39};
121
122 poly1305_context ctx;
123 poly1305_context total_ctx;
124 unsigned char all_key[32];
125 unsigned char all_msg[256];
126 unsigned char mac[16];
127 size_t i, j;
128 int result = 1;
129
130 for (i = 0; i < sizeof(mac); i++)
131 {
132 mac[i] = 0;
133 }
134 poly1305_auth(mac, nacl_msg, sizeof(nacl_msg), nacl_key);
135 result &= poly1305_verify(nacl_mac, mac);
136
137 for (i = 0; i < sizeof(mac); i++)
138 {
139 mac[i] = 0;
140 }
141 poly1305_init(&ctx, nacl_key);
142 poly1305_update(&ctx, nacl_msg + 0, 32);
143 poly1305_update(&ctx, nacl_msg + 32, 64);
144 poly1305_update(&ctx, nacl_msg + 96, 16);
145 poly1305_update(&ctx, nacl_msg + 112, 8);
146 poly1305_update(&ctx, nacl_msg + 120, 4);
147 poly1305_update(&ctx, nacl_msg + 124, 2);
148 poly1305_update(&ctx, nacl_msg + 126, 1);
149 poly1305_update(&ctx, nacl_msg + 127, 1);
150 poly1305_update(&ctx, nacl_msg + 128, 1);
151 poly1305_update(&ctx, nacl_msg + 129, 1);
152 poly1305_update(&ctx, nacl_msg + 130, 1);
153 poly1305_finish(&ctx, mac);
154 result &= poly1305_verify(nacl_mac, mac);
155
156 for (i = 0; i < sizeof(mac); i++)
157 {
158 mac[i] = 0;
159 }
160 poly1305_auth(mac, wrap_msg, sizeof(wrap_msg), wrap_key);
161 result &= poly1305_verify(wrap_mac, mac);
162
163 poly1305_init(&total_ctx, total_key);
164 for (i = 0; i < 256; i++)
165 {
166 /* set key and message to 'i,i,i..' */
167 for (j = 0; j < sizeof(all_key); j++)
168 {
169 all_key[j] = i;
170 }
171 for (j = 0; j < i; j++)
172 {
173 all_msg[j] = i;
174 }
175 poly1305_auth(mac, all_msg, i, all_key);
176 poly1305_update(&total_ctx, mac, 16);
177 }
178 poly1305_finish(&total_ctx, mac);
179 result &= poly1305_verify(total_mac, mac);
180
181 return result;
182 }
183
