1 /* $OpenBSD: x25519test.c,v 1.3 2022/12/01 13:55:22 tb Exp $ */ 2 /* 3 * Copyright (c) 2015, Google Inc. 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 12 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 14 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 15 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <stdint.h> 19 #include <stdio.h> 20 #include <string.h> 21 22 #include <openssl/curve25519.h> 23 24 static int 25 x25519_test(void) 26 { 27 /* Taken from https://tools.ietf.org/html/rfc7748#section-5.2 */ 28 static const uint8_t kScalar1[32] = { 29 0xa5, 0x46, 0xe3, 0x6b, 0xf0, 0x52, 0x7c, 0x9d, 30 0x3b, 0x16, 0x15, 0x4b, 0x82, 0x46, 0x5e, 0xdd, 31 0x62, 0x14, 0x4c, 0x0a, 0xc1, 0xfc, 0x5a, 0x18, 32 0x50, 0x6a, 0x22, 0x44, 0xba, 0x44, 0x9a, 0xc4, 33 }; 34 static const uint8_t kPoint1[32] = { 35 0xe6, 0xdb, 0x68, 0x67, 0x58, 0x30, 0x30, 0xdb, 36 0x35, 0x94, 0xc1, 0xa4, 0x24, 0xb1, 0x5f, 0x7c, 37 0x72, 0x66, 0x24, 0xec, 0x26, 0xb3, 0x35, 0x3b, 38 0x10, 0xa9, 0x03, 0xa6, 0xd0, 0xab, 0x1c, 0x4c, 39 }; 40 static const uint8_t kExpected1[32] = { 41 0xc3, 0xda, 0x55, 0x37, 0x9d, 0xe9, 0xc6, 0x90, 42 0x8e, 0x94, 0xea, 0x4d, 0xf2, 0x8d, 0x08, 0x4f, 43 0x32, 0xec, 0xcf, 0x03, 0x49, 0x1c, 0x71, 0xf7, 44 0x54, 0xb4, 0x07, 0x55, 0x77, 0xa2, 0x85, 0x52, 45 }; 46 static const uint8_t kScalar2[32] = { 47 0x4b, 0x66, 0xe9, 0xd4, 0xd1, 0xb4, 0x67, 0x3c, 48 0x5a, 0xd2, 0x26, 0x91, 0x95, 0x7d, 0x6a, 0xf5, 49 0xc1, 0x1b, 0x64, 0x21, 0xe0, 0xea, 0x01, 0xd4, 50 0x2c, 0xa4, 0x16, 0x9e, 0x79, 0x18, 0xba, 0x0d, 51 }; 52 static const uint8_t kPoint2[32] = { 53 0xe5, 0x21, 0x0f, 0x12, 0x78, 0x68, 0x11, 0xd3, 54 0xf4, 0xb7, 0x95, 0x9d, 0x05, 0x38, 0xae, 0x2c, 55 0x31, 0xdb, 0xe7, 0x10, 0x6f, 0xc0, 0x3c, 0x3e, 56 0xfc, 0x4c, 0xd5, 0x49, 0xc7, 0x15, 0xa4, 0x93, 57 }; 58 static const uint8_t kExpected2[32] = { 59 0x95, 0xcb, 0xde, 0x94, 0x76, 0xe8, 0x90, 0x7d, 60 0x7a, 0xad, 0xe4, 0x5c, 0xb4, 0xb8, 0x73, 0xf8, 61 0x8b, 0x59, 0x5a, 0x68, 0x79, 0x9f, 0xa1, 0x52, 62 0xe6, 0xf8, 0xf7, 0x64, 0x7a, 0xac, 0x79, 0x57, 63 }; 64 65 uint8_t out[32]; 66 67 X25519(out, kScalar1, kPoint1); 68 if (memcmp(kExpected1, out, sizeof(out)) != 0) { 69 fprintf(stderr, "X25519 test one failed.\n"); 70 return 1; 71 } 72 73 X25519(out, kScalar2, kPoint2); 74 if (memcmp(kExpected2, out, sizeof(out)) != 0) { 75 fprintf(stderr, "X25519 test two failed.\n"); 76 return 1; 77 } 78 79 return 0; 80 } 81 82 static int 83 x25519_iterated_test(void) 84 { 85 /* Taken from https://tools.ietf.org/html/rfc7748#section-5.2 */ 86 static const uint8_t kExpected[32] = { 87 0x68, 0x4c, 0xf5, 0x9b, 0xa8, 0x33, 0x09, 0x55, 88 0x28, 0x00, 0xef, 0x56, 0x6f, 0x2f, 0x4d, 0x3c, 89 0x1c, 0x38, 0x87, 0xc4, 0x93, 0x60, 0xe3, 0x87, 90 0x5f, 0x2e, 0xb9, 0x4d, 0x99, 0x53, 0x2c, 0x51, 91 }; 92 93 uint8_t scalar[32] = {9}, point[32] = {9}, out[32]; 94 unsigned i; 95 96 for (i = 0; i < 1000; i++) { 97 X25519(out, scalar, point); 98 memcpy(point, scalar, sizeof(point)); 99 memcpy(scalar, out, sizeof(scalar)); 100 } 101 102 if (memcmp(kExpected, scalar, sizeof(kExpected)) != 0) { 103 fprintf(stderr, "Iterated X25519 test failed\n"); 104 return 1; 105 } 106 107 return 0; 108 } 109 110 static int 111 x25519_small_order_test(void) 112 { 113 static const uint8_t kSmallOrderPoint[32] = { 114 0xe0, 0xeb, 0x7a, 0x7c, 0x3b, 0x41, 0xb8, 0xae, 115 0x16, 0x56, 0xe3, 0xfa, 0xf1, 0x9f, 0xc4, 0x6a, 116 0xda, 0x09, 0x8d, 0xeb, 0x9c, 0x32, 0xb1, 0xfd, 117 0x86, 0x62, 0x05, 0x16, 0x5f, 0x49, 0xb8, 0x00, 118 }; 119 120 uint8_t out[32], private_key[32]; 121 122 memset(private_key, 0x11, sizeof(private_key)); 123 if (X25519(out, private_key, kSmallOrderPoint)) { 124 fprintf(stderr, "X25519 returned success with a small-order input.\n"); 125 return 1; 126 } 127 128 return 0; 129 } 130 131 int 132 main(int argc, char **argv) 133 { 134 int failed = 0; 135 136 failed |= x25519_test(); 137 failed |= x25519_iterated_test(); 138 failed |= x25519_small_order_test(); 139 140 return failed; 141 } 142