1 /* 2 * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <getopt.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 36 #include <openssl/conf.h> 37 #include <openssl/evp.h> 38 #include <openssl/pem.h> 39 40 #include "cert.h" 41 #include "debug.h" 42 #include "key.h" 43 #include "platform_oid.h" 44 #include "sha.h" 45 46 #define MAX_FILENAME_LEN 1024 47 48 /* 49 * Create a new key container 50 */ 51 static int key_new(key_t *key) 52 { 53 /* Create key pair container */ 54 key->key = EVP_PKEY_new(); 55 if (key->key == NULL) { 56 return 0; 57 } 58 59 return 1; 60 } 61 62 static int key_create_rsa(key_t *key) 63 { 64 RSA *rsa = NULL; 65 66 rsa = RSA_generate_key(RSA_KEY_BITS, RSA_F4, NULL, NULL); 67 if (rsa == NULL) { 68 printf("Cannot create RSA key\n"); 69 goto err; 70 } 71 if (!EVP_PKEY_assign_RSA(key->key, rsa)) { 72 printf("Cannot assign RSA key\n"); 73 goto err; 74 } 75 76 return 1; 77 err: 78 RSA_free(rsa); 79 return 0; 80 } 81 82 #ifndef OPENSSL_NO_EC 83 static int key_create_ecdsa(key_t *key) 84 { 85 EC_KEY *ec = NULL; 86 87 ec = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1); 88 if (ec == NULL) { 89 printf("Cannot create EC key\n"); 90 goto err; 91 } 92 if (!EC_KEY_generate_key(ec)) { 93 printf("Cannot generate EC key\n"); 94 goto err; 95 } 96 EC_KEY_set_flags(ec, EC_PKEY_NO_PARAMETERS); 97 EC_KEY_set_asn1_flag(ec, OPENSSL_EC_NAMED_CURVE); 98 if (!EVP_PKEY_assign_EC_KEY(key->key, ec)) { 99 printf("Cannot assign EC key\n"); 100 goto err; 101 } 102 103 return 1; 104 err: 105 EC_KEY_free(ec); 106 return 0; 107 } 108 #endif /* OPENSSL_NO_EC */ 109 110 typedef int (*key_create_fn_t)(key_t *key); 111 static const key_create_fn_t key_create_fn[KEY_ALG_MAX_NUM] = { 112 key_create_rsa, 113 #ifndef OPENSSL_NO_EC 114 key_create_ecdsa, 115 #endif /* OPENSSL_NO_EC */ 116 }; 117 118 int key_create(key_t *key, int type) 119 { 120 if (type >= KEY_ALG_MAX_NUM) { 121 printf("Invalid key type\n"); 122 return 0; 123 } 124 125 /* Create OpenSSL key container */ 126 if (!key_new(key)) { 127 return 0; 128 } 129 130 if (key_create_fn[type]) { 131 return key_create_fn[type](key); 132 } 133 134 return 0; 135 } 136 137 int key_load(key_t *key, unsigned int *err_code) 138 { 139 FILE *fp = NULL; 140 EVP_PKEY *k = NULL; 141 142 /* Create OpenSSL key container */ 143 if (!key_new(key)) { 144 *err_code = KEY_ERR_MALLOC; 145 return 0; 146 } 147 148 if (key->fn) { 149 /* Load key from file */ 150 fp = fopen(key->fn, "r"); 151 if (fp) { 152 k = PEM_read_PrivateKey(fp, &key->key, NULL, NULL); 153 fclose(fp); 154 if (k) { 155 *err_code = KEY_ERR_NONE; 156 return 1; 157 } else { 158 ERROR("Cannot load key from %s\n", key->fn); 159 *err_code = KEY_ERR_LOAD; 160 } 161 } else { 162 WARN("Cannot open file %s\n", key->fn); 163 *err_code = KEY_ERR_OPEN; 164 } 165 } else { 166 WARN("Key filename not specified\n"); 167 *err_code = KEY_ERR_FILENAME; 168 } 169 170 return 0; 171 } 172 173 int key_store(key_t *key) 174 { 175 FILE *fp = NULL; 176 177 if (key->fn) { 178 fp = fopen(key->fn, "w"); 179 if (fp) { 180 PEM_write_PrivateKey(fp, key->key, 181 NULL, NULL, 0, NULL, NULL); 182 fclose(fp); 183 return 1; 184 } else { 185 ERROR("Cannot create file %s\n", key->fn); 186 } 187 } else { 188 ERROR("Key filename not specified\n"); 189 } 190 191 return 0; 192 } 193