1 /* 2 * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <getopt.h> 8 #include <stdio.h> 9 #include <stdlib.h> 10 #include <string.h> 11 12 #include <openssl/conf.h> 13 #include <openssl/evp.h> 14 #include <openssl/pem.h> 15 16 #if USE_TBBR_DEFS 17 #include <tbbr_oid.h> 18 #else 19 #include <platform_oid.h> 20 #endif 21 22 #include "cert.h" 23 #include "cmd_opt.h" 24 #include "debug.h" 25 #include "key.h" 26 #include "sha.h" 27 28 #define MAX_FILENAME_LEN 1024 29 30 /* 31 * Create a new key container 32 */ 33 int key_new(key_t *key) 34 { 35 /* Create key pair container */ 36 key->key = EVP_PKEY_new(); 37 if (key->key == NULL) { 38 return 0; 39 } 40 41 return 1; 42 } 43 44 static int key_create_rsa(key_t *key) 45 { 46 BIGNUM *e; 47 RSA *rsa = NULL; 48 49 e = BN_new(); 50 if (e == NULL) { 51 printf("Cannot create RSA exponent\n"); 52 goto err; 53 } 54 55 if (!BN_set_word(e, RSA_F4)) { 56 printf("Cannot assign RSA exponent\n"); 57 goto err; 58 } 59 60 rsa = RSA_new(); 61 if (rsa == NULL) { 62 printf("Cannot create RSA key\n"); 63 goto err; 64 } 65 66 if (!RSA_generate_key_ex(rsa, RSA_KEY_BITS, e, NULL)) { 67 printf("Cannot generate RSA key\n"); 68 goto err; 69 } 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 BN_free(e); 80 return 0; 81 } 82 83 #ifndef OPENSSL_NO_EC 84 static int key_create_ecdsa(key_t *key) 85 { 86 EC_KEY *ec; 87 88 ec = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1); 89 if (ec == NULL) { 90 printf("Cannot create EC key\n"); 91 goto err; 92 } 93 if (!EC_KEY_generate_key(ec)) { 94 printf("Cannot generate EC key\n"); 95 goto err; 96 } 97 EC_KEY_set_flags(ec, EC_PKEY_NO_PARAMETERS); 98 EC_KEY_set_asn1_flag(ec, OPENSSL_EC_NAMED_CURVE); 99 if (!EVP_PKEY_assign_EC_KEY(key->key, ec)) { 100 printf("Cannot assign EC key\n"); 101 goto err; 102 } 103 104 return 1; 105 err: 106 EC_KEY_free(ec); 107 return 0; 108 } 109 #endif /* OPENSSL_NO_EC */ 110 111 typedef int (*key_create_fn_t)(key_t *key); 112 static const key_create_fn_t key_create_fn[KEY_ALG_MAX_NUM] = { 113 key_create_rsa, 114 #ifndef OPENSSL_NO_EC 115 key_create_ecdsa, 116 #endif /* OPENSSL_NO_EC */ 117 }; 118 119 int key_create(key_t *key, int type) 120 { 121 if (type >= KEY_ALG_MAX_NUM) { 122 printf("Invalid key type\n"); 123 return 0; 124 } 125 126 if (key_create_fn[type]) { 127 return key_create_fn[type](key); 128 } 129 130 return 0; 131 } 132 133 int key_load(key_t *key, unsigned int *err_code) 134 { 135 FILE *fp; 136 EVP_PKEY *k; 137 138 if (key->fn) { 139 /* Load key from file */ 140 fp = fopen(key->fn, "r"); 141 if (fp) { 142 k = PEM_read_PrivateKey(fp, &key->key, NULL, NULL); 143 fclose(fp); 144 if (k) { 145 *err_code = KEY_ERR_NONE; 146 return 1; 147 } else { 148 ERROR("Cannot load key from %s\n", key->fn); 149 *err_code = KEY_ERR_LOAD; 150 } 151 } else { 152 WARN("Cannot open file %s\n", key->fn); 153 *err_code = KEY_ERR_OPEN; 154 } 155 } else { 156 WARN("Key filename not specified\n"); 157 *err_code = KEY_ERR_FILENAME; 158 } 159 160 return 0; 161 } 162 163 int key_store(key_t *key) 164 { 165 FILE *fp; 166 167 if (key->fn) { 168 fp = fopen(key->fn, "w"); 169 if (fp) { 170 PEM_write_PrivateKey(fp, key->key, 171 NULL, NULL, 0, NULL, NULL); 172 fclose(fp); 173 return 1; 174 } else { 175 ERROR("Cannot create file %s\n", key->fn); 176 } 177 } else { 178 ERROR("Key filename not specified\n"); 179 } 180 181 return 0; 182 } 183 184 int key_init(void) 185 { 186 cmd_opt_t cmd_opt; 187 key_t *key; 188 unsigned int i; 189 190 for (i = 0; i < num_keys; i++) { 191 key = &keys[i]; 192 if (key->opt != NULL) { 193 cmd_opt.long_opt.name = key->opt; 194 cmd_opt.long_opt.has_arg = required_argument; 195 cmd_opt.long_opt.flag = NULL; 196 cmd_opt.long_opt.val = CMD_OPT_KEY; 197 cmd_opt.help_msg = key->help_msg; 198 cmd_opt_add(&cmd_opt); 199 } 200 } 201 202 return 0; 203 } 204 205 key_t *key_get_by_opt(const char *opt) 206 { 207 key_t *key; 208 unsigned int i; 209 210 /* Sequential search. This is not a performance concern since the number 211 * of keys is bounded and the code runs on a host machine */ 212 for (i = 0; i < num_keys; i++) { 213 key = &keys[i]; 214 if (0 == strcmp(key->opt, opt)) { 215 return key; 216 } 217 } 218 219 return NULL; 220 } 221