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