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 int key_create(key_t *key, int type) 63 { 64 RSA *rsa = NULL; 65 EC_KEY *ec = NULL; 66 67 /* Create OpenSSL key container */ 68 if (!key_new(key)) { 69 goto err; 70 } 71 72 switch (type) { 73 case KEY_ALG_RSA: 74 /* Generate a new RSA key */ 75 rsa = RSA_generate_key(RSA_KEY_BITS, RSA_F4, NULL, NULL); 76 if (rsa == NULL) { 77 printf("Cannot create RSA key\n"); 78 goto err; 79 } 80 if (!EVP_PKEY_assign_RSA(key->key, rsa)) { 81 printf("Cannot assign RSA key\n"); 82 goto err; 83 } 84 break; 85 case KEY_ALG_ECDSA: 86 /* Generate a new ECDSA key */ 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 break; 103 default: 104 goto err; 105 } 106 107 return 1; 108 109 err: 110 RSA_free(rsa); 111 EC_KEY_free(ec); 112 113 return 0; 114 } 115 116 int key_load(key_t *key, unsigned int *err_code) 117 { 118 FILE *fp = NULL; 119 EVP_PKEY *k = NULL; 120 121 /* Create OpenSSL key container */ 122 if (!key_new(key)) { 123 *err_code = KEY_ERR_MALLOC; 124 return 0; 125 } 126 127 if (key->fn) { 128 /* Load key from file */ 129 fp = fopen(key->fn, "r"); 130 if (fp) { 131 k = PEM_read_PrivateKey(fp, &key->key, NULL, NULL); 132 fclose(fp); 133 if (k) { 134 *err_code = KEY_ERR_NONE; 135 return 1; 136 } else { 137 ERROR("Cannot load key from %s\n", key->fn); 138 *err_code = KEY_ERR_LOAD; 139 } 140 } else { 141 WARN("Cannot open file %s\n", key->fn); 142 *err_code = KEY_ERR_OPEN; 143 } 144 } else { 145 WARN("Key filename not specified\n"); 146 *err_code = KEY_ERR_FILENAME; 147 } 148 149 return 0; 150 } 151 152 int key_store(key_t *key) 153 { 154 FILE *fp = NULL; 155 156 if (key->fn) { 157 fp = fopen(key->fn, "w"); 158 if (fp) { 159 PEM_write_PrivateKey(fp, key->key, 160 NULL, NULL, 0, NULL, NULL); 161 fclose(fp); 162 return 1; 163 } else { 164 ERROR("Cannot create file %s\n", key->fn); 165 } 166 } else { 167 ERROR("Key filename not specified\n"); 168 } 169 170 return 0; 171 } 172