David Brown | fecda2d | 2017-09-07 10:20:34 -0600 | [diff] [blame^] | 1 | /* test_ecc_utils.c - TinyCrypt common functions for ECC tests */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (C) 2015 by Intel Corporation, All Rights Reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are met: |
| 8 | * |
| 9 | * - Redistributions of source code must retain the above copyright notice, |
| 10 | * this list of conditions and the following disclaimer. |
| 11 | * |
| 12 | * - Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * - Neither the name of Intel Corporation nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 21 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 24 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 30 | * POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | * test_ecc_utils.c -- Implementation of some common functions for ECC tests. |
| 33 | * |
| 34 | */ |
| 35 | #include <tinycrypt/ecc.h> |
| 36 | #include <tinycrypt/ecc_dh.h> |
| 37 | #include <test_ecc_utils.h> |
| 38 | #include <tinycrypt/constants.h> |
| 39 | |
| 40 | #include <stdio.h> |
| 41 | #include <stdlib.h> |
| 42 | #include <string.h> |
| 43 | #include <unistd.h> |
| 44 | |
| 45 | extern int randfd; |
| 46 | |
| 47 | void getRandomBytes(void *p_dest, unsigned p_size) { |
| 48 | if(read(randfd, p_dest, p_size) != (int)p_size) { |
| 49 | printf("Failed to get random bytes.\n"); |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | int hex2int (char hex) { |
| 54 | uint8_t dec; |
| 55 | |
| 56 | if ('0' <= hex && hex <= '9') dec = hex - '0'; |
| 57 | else if ('a' <= hex && hex <= 'f') dec = hex - 'a' + 10; |
| 58 | else if ('A' <= hex && hex <= 'F') dec = hex - 'A' + 10; |
| 59 | else return -1; |
| 60 | |
| 61 | return dec; |
| 62 | } |
| 63 | |
| 64 | /* |
| 65 | * Convert hex string to byte string |
| 66 | * Return number of bytes written to buf, or 0 on error |
| 67 | */ |
| 68 | int hex2bin( |
| 69 | uint8_t *buf, |
| 70 | const size_t buflen, |
| 71 | const char *hex, |
| 72 | const size_t hexlen) { |
| 73 | |
| 74 | int dec; |
| 75 | |
| 76 | if (buflen < hexlen/2 + hexlen%2) |
| 77 | return false; |
| 78 | |
| 79 | // if hexlen is uneven, insert leading zero nibble |
| 80 | if (hexlen%2) { |
| 81 | dec = hex2int(hex[0]); |
| 82 | if (dec == -1) |
| 83 | return false; |
| 84 | buf[0] = dec; |
| 85 | buf++; |
| 86 | hex++; |
| 87 | } |
| 88 | |
| 89 | // regular hex conversion |
| 90 | for (size_t i = 0; i<hexlen/2; i++) { |
| 91 | dec = hex2int(hex[2*i]); |
| 92 | if (dec == -1) |
| 93 | return false; |
| 94 | buf[i] = dec << 4; |
| 95 | |
| 96 | dec = hex2int(hex[2*i+1]); |
| 97 | if (dec == -1) |
| 98 | return false; |
| 99 | buf[i] += dec; |
| 100 | } |
| 101 | return hexlen/2 + hexlen%2; |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Convert hex string to zero-padded nanoECC scalar |
| 106 | */ |
| 107 | void string2scalar(uint32_t * scalar, uint32_t num_word32, char *str) { |
| 108 | |
| 109 | uint32_t num_bytes = 4*num_word32; |
| 110 | uint8_t tmp[num_bytes]; |
| 111 | size_t hexlen = strlen(str); |
| 112 | |
| 113 | int padding; |
| 114 | |
| 115 | if (0 > (padding = 2*num_bytes - strlen(str))) { |
| 116 | printf( |
| 117 | "Error: 2*num_bytes(%u) < strlen(hex) (%zu)\n", |
| 118 | 2*num_bytes, |
| 119 | strlen(str)); |
| 120 | exit(-1); |
| 121 | } |
| 122 | |
| 123 | memset(tmp, 0, padding/2); |
| 124 | |
| 125 | if (false == hex2bin(tmp+padding/2, num_bytes, str, hexlen)) |
| 126 | exit(-1); |
| 127 | ecc_bytes2native(scalar, tmp); |
| 128 | |
| 129 | } |
| 130 | |
| 131 | void vli_print(uint32_t *p_vli, unsigned int p_size) { |
| 132 | while(p_size) { |
| 133 | printf("%08X ", (unsigned)p_vli[p_size - 1]); |
| 134 | --p_size; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | void print_ecc_scalar( |
| 139 | const char *label, |
| 140 | const uint32_t * p_vli, |
| 141 | uint32_t num_word32) { |
| 142 | uint32_t i; |
| 143 | |
| 144 | if (label) |
| 145 | printf("%s = { ", label); |
| 146 | |
| 147 | for(i=0; i<num_word32-1; ++i) |
| 148 | printf("0x%08lX, ", (unsigned long)p_vli[i]); |
| 149 | printf("0x%08lX", (unsigned long)p_vli[i]); |
| 150 | |
| 151 | if (label) |
| 152 | printf(" };\n"); |
| 153 | } |
| 154 | |
| 155 | void check_code(const int num, |
| 156 | const char *name, |
| 157 | const int expected, |
| 158 | const int computed, |
| 159 | const int verbose) { |
| 160 | |
| 161 | if (expected != computed) { |
| 162 | printf("\n Vector #%02d check %s - FAILURE:\n", num, name); |
| 163 | printf("\n Expected: %d, computed: %d\n\n", expected, computed); |
| 164 | exit(-1); |
| 165 | } |
| 166 | |
| 167 | if (verbose) |
| 168 | printf(" Vector #%02d check %s - success (%d=%d)\n", |
| 169 | num, |
| 170 | name, |
| 171 | expected, |
| 172 | computed); |
| 173 | |
| 174 | } |
| 175 | |
| 176 | void check_ecc_result(const int num, const char *name, |
| 177 | const uint32_t *expected, |
| 178 | const uint32_t *computed, |
| 179 | const uint32_t num_word32, |
| 180 | const bool verbose) { |
| 181 | |
| 182 | uint32_t num_bytes = 4*num_word32; |
| 183 | if (memcmp(computed, expected, num_bytes)) { |
| 184 | printf("\n Vector #%02d check %s - FAILURE:\n\n", num, name); |
| 185 | print_ecc_scalar("Expected", expected, num_word32); |
| 186 | print_ecc_scalar("Computed", computed, num_word32); |
| 187 | printf("\n"); |
| 188 | exit(-1); |
| 189 | } |
| 190 | if (verbose) |
| 191 | printf(" Vector #%02d check %s - success\n", num, name); |
| 192 | } |
| 193 | |
| 194 | /* Test ecc_make_keys, and also as keygen part of other tests */ |
| 195 | EccPoint keygen_vectors(char **d_vec, |
| 196 | char **qx_vec, |
| 197 | char **qy_vec, |
| 198 | int tests, |
| 199 | bool verbose) { |
| 200 | |
| 201 | EccPoint pub; |
| 202 | uint32_t seed[NUM_ECC_DIGITS * 2]; |
| 203 | uint32_t prv[NUM_ECC_DIGITS]; |
| 204 | |
| 205 | /* expected outputs (converted input vectors) */ |
| 206 | EccPoint exp_pub; |
| 207 | uint32_t exp_prv[NUM_ECC_DIGITS]; |
| 208 | |
| 209 | for (int i=0; i<tests; i++) { |
| 210 | |
| 211 | string2scalar(exp_prv, NUM_ECC_DIGITS, d_vec[i]); |
| 212 | string2scalar(exp_pub.x, NUM_ECC_DIGITS, qx_vec[i]); |
| 213 | string2scalar(exp_pub.y, NUM_ECC_DIGITS, qy_vec[i]); |
| 214 | |
| 215 | /* |
| 216 | * Feed prvkey vector as padded random seed into ecc_make_key. |
| 217 | * Internal mod-reduction will be zero-op and generate correct prv/pub |
| 218 | */ |
| 219 | memset(seed, 0, NUM_ECC_BYTES * 2); |
| 220 | string2scalar(seed, NUM_ECC_DIGITS, d_vec[i]); |
| 221 | ecc_make_key(&pub, prv, seed); |
| 222 | |
| 223 | // validate correctness of vector conversion and make_key() |
| 224 | check_ecc_result(i, "prv ", exp_prv, prv, NUM_ECC_DIGITS, verbose); |
| 225 | check_ecc_result(i, "pub.x", exp_pub.x, pub.x, NUM_ECC_DIGITS, verbose); |
| 226 | check_ecc_result(i, "pub.y", exp_pub.y, pub.y, NUM_ECC_DIGITS, verbose); |
| 227 | |
| 228 | } |
| 229 | return pub; |
| 230 | } |