1 /* $OpenBSD: poly1305test.c,v 1.3 2018/07/17 17:06:49 tb Exp $ */
2 /*
3 * Public Domain poly1305 from Andrew Moon
4 * Based on poly1305-donna.c from:
5 * https://github.com/floodyberry/poly1305-donna
6 */
7
8 #include <stdio.h>
9
10 #include <openssl/poly1305.h>
11
12 void poly1305_auth(unsigned char mac[16], const unsigned char *m, size_t bytes,
13 const unsigned char key[32]);
14
15 int poly1305_verify(const unsigned char mac1[16], const unsigned char mac2[16]);
16 int poly1305_power_on_self_test(void);
17
18 void
poly1305_auth(unsigned char mac[16],const unsigned char * m,size_t bytes,const unsigned char key[32])19 poly1305_auth(unsigned char mac[16], const unsigned char *m, size_t bytes,
20 const unsigned char key[32]) {
21 poly1305_context ctx;
22 CRYPTO_poly1305_init(&ctx, key);
23 CRYPTO_poly1305_update(&ctx, m, bytes);
24 CRYPTO_poly1305_finish(&ctx, mac);
25 }
26
27 int
poly1305_verify(const unsigned char mac1[16],const unsigned char mac2[16])28 poly1305_verify(const unsigned char mac1[16], const unsigned char mac2[16])
29 {
30 size_t i;
31 unsigned int dif = 0;
32 for (i = 0; i < 16; i++)
33 dif |= (mac1[i] ^ mac2[i]);
34 dif = (dif - 1) >> ((sizeof(unsigned int) * 8) - 1);
35 return (dif & 1);
36 }
37
38 /* test a few basic operations */
39 int
poly1305_power_on_self_test(void)40 poly1305_power_on_self_test(void)
41 {
42 /* example from nacl */
43 static const unsigned char nacl_key[32] = {
44 0xee, 0xa6, 0xa7, 0x25, 0x1c, 0x1e, 0x72, 0x91,
45 0x6d, 0x11, 0xc2, 0xcb, 0x21, 0x4d, 0x3c, 0x25,
46 0x25, 0x39, 0x12, 0x1d, 0x8e, 0x23, 0x4e, 0x65,
47 0x2d, 0x65, 0x1f, 0xa4, 0xc8, 0xcf, 0xf8, 0x80,
48 };
49
50 static const unsigned char nacl_msg[131] = {
51 0x8e, 0x99, 0x3b, 0x9f, 0x48, 0x68, 0x12, 0x73,
52 0xc2, 0x96, 0x50, 0xba, 0x32, 0xfc, 0x76, 0xce,
53 0x48, 0x33, 0x2e, 0xa7, 0x16, 0x4d, 0x96, 0xa4,
54 0x47, 0x6f, 0xb8, 0xc5, 0x31, 0xa1, 0x18, 0x6a,
55 0xc0, 0xdf, 0xc1, 0x7c, 0x98, 0xdc, 0xe8, 0x7b,
56 0x4d, 0xa7, 0xf0, 0x11, 0xec, 0x48, 0xc9, 0x72,
57 0x71, 0xd2, 0xc2, 0x0f, 0x9b, 0x92, 0x8f, 0xe2,
58 0x27, 0x0d, 0x6f, 0xb8, 0x63, 0xd5, 0x17, 0x38,
59 0xb4, 0x8e, 0xee, 0xe3, 0x14, 0xa7, 0xcc, 0x8a,
60 0xb9, 0x32, 0x16, 0x45, 0x48, 0xe5, 0x26, 0xae,
61 0x90, 0x22, 0x43, 0x68, 0x51, 0x7a, 0xcf, 0xea,
62 0xbd, 0x6b, 0xb3, 0x73, 0x2b, 0xc0, 0xe9, 0xda,
63 0x99, 0x83, 0x2b, 0x61, 0xca, 0x01, 0xb6, 0xde,
64 0x56, 0x24, 0x4a, 0x9e, 0x88, 0xd5, 0xf9, 0xb3,
65 0x79, 0x73, 0xf6, 0x22, 0xa4, 0x3d, 0x14, 0xa6,
66 0x59, 0x9b, 0x1f, 0x65, 0x4c, 0xb4, 0x5a, 0x74,
67 0xe3, 0x55, 0xa5
68 };
69
70 static const unsigned char nacl_mac[16] = {
71 0xf3, 0xff, 0xc7, 0x70, 0x3f, 0x94, 0x00, 0xe5,
72 0x2a, 0x7d, 0xfb, 0x4b, 0x3d, 0x33, 0x05, 0xd9
73 };
74
75 /* generates a final value of (2^130 - 2) == 3 */
76 static const unsigned char wrap_key[32] = {
77 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
78 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
79 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
80 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
81 };
82
83 static const unsigned char wrap_msg[16] = {
84 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
85 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
86 };
87
88 static const unsigned char wrap_mac[16] = {
89 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
90 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
91 };
92
93 /*
94 mac of the macs of messages of length 0 to 256, where the key and messages
95 have all their values set to the length
96 */
97 static const unsigned char total_key[32] = {
98 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
99 0xff, 0xfe, 0xfd, 0xfc, 0xfb, 0xfa, 0xf9,
100 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
101 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
102 };
103
104 static const unsigned char total_mac[16] = {
105 0x64, 0xaf, 0xe2, 0xe8, 0xd6, 0xad, 0x7b, 0xbd,
106 0xd2, 0x87, 0xf9, 0x7c, 0x44, 0x62, 0x3d, 0x39
107 };
108
109 poly1305_context ctx;
110 poly1305_context total_ctx;
111 unsigned char all_key[32];
112 unsigned char all_msg[256];
113 unsigned char mac[16];
114 size_t i, j;
115 int result = 1;
116
117 for (i = 0; i < sizeof(mac); i++)
118 mac[i] = 0;
119 poly1305_auth(mac, nacl_msg, sizeof(nacl_msg), nacl_key);
120 result &= poly1305_verify(nacl_mac, mac);
121
122 for (i = 0; i < sizeof(mac); i++)
123 mac[i] = 0;
124 CRYPTO_poly1305_init(&ctx, nacl_key);
125 CRYPTO_poly1305_update(&ctx, nacl_msg + 0, 32);
126 CRYPTO_poly1305_update(&ctx, nacl_msg + 32, 64);
127 CRYPTO_poly1305_update(&ctx, nacl_msg + 96, 16);
128 CRYPTO_poly1305_update(&ctx, nacl_msg + 112, 8);
129 CRYPTO_poly1305_update(&ctx, nacl_msg + 120, 4);
130 CRYPTO_poly1305_update(&ctx, nacl_msg + 124, 2);
131 CRYPTO_poly1305_update(&ctx, nacl_msg + 126, 1);
132 CRYPTO_poly1305_update(&ctx, nacl_msg + 127, 1);
133 CRYPTO_poly1305_update(&ctx, nacl_msg + 128, 1);
134 CRYPTO_poly1305_update(&ctx, nacl_msg + 129, 1);
135 CRYPTO_poly1305_update(&ctx, nacl_msg + 130, 1);
136 CRYPTO_poly1305_finish(&ctx, mac);
137 result &= poly1305_verify(nacl_mac, mac);
138
139 for (i = 0; i < sizeof(mac); i++)
140 mac[i] = 0;
141 poly1305_auth(mac, wrap_msg, sizeof(wrap_msg), wrap_key);
142 result &= poly1305_verify(wrap_mac, mac);
143
144 CRYPTO_poly1305_init(&total_ctx, total_key);
145 for (i = 0; i < 256; i++) {
146 /* set key and message to 'i,i,i..' */
147 for (j = 0; j < sizeof(all_key); j++)
148 all_key[j] = i;
149 for (j = 0; j < i; j++)
150 all_msg[j] = i;
151 poly1305_auth(mac, all_msg, i, all_key);
152 CRYPTO_poly1305_update(&total_ctx, mac, 16);
153 }
154 CRYPTO_poly1305_finish(&total_ctx, mac);
155 result &= poly1305_verify(total_mac, mac);
156
157 return result;
158 }
159
160 int
main(int argc,char ** argv)161 main(int argc, char **argv)
162 {
163 if (!poly1305_power_on_self_test()) {
164 fprintf(stderr, "One or more self tests failed!\n");
165 return 1;
166 }
167
168 return 0;
169 }
170