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, /* KEY_ALG_RSA */ 114 key_create_rsa, /* KEY_ALG_RSA_1_5 */ 115 #ifndef OPENSSL_NO_EC 116 key_create_ecdsa, /* KEY_ALG_ECDSA */ 117 #endif /* OPENSSL_NO_EC */ 118 }; 119 120 int key_create(key_t *key, int type) 121 { 122 if (type >= KEY_ALG_MAX_NUM) { 123 printf("Invalid key type\n"); 124 return 0; 125 } 126 127 if (key_create_fn[type]) { 128 return key_create_fn[type](key); 129 } 130 131 return 0; 132 } 133 134 int key_load(key_t *key, unsigned int *err_code) 135 { 136 FILE *fp; 137 EVP_PKEY *k; 138 139 if (key->fn) { 140 /* Load key from file */ 141 fp = fopen(key->fn, "r"); 142 if (fp) { 143 k = PEM_read_PrivateKey(fp, &key->key, NULL, NULL); 144 fclose(fp); 145 if (k) { 146 *err_code = KEY_ERR_NONE; 147 return 1; 148 } else { 149 ERROR("Cannot load key from %s\n", key->fn); 150 *err_code = KEY_ERR_LOAD; 151 } 152 } else { 153 WARN("Cannot open file %s\n", key->fn); 154 *err_code = KEY_ERR_OPEN; 155 } 156 } else { 157 WARN("Key filename not specified\n"); 158 *err_code = KEY_ERR_FILENAME; 159 } 160 161 return 0; 162 } 163 164 int key_store(key_t *key) 165 { 166 FILE *fp; 167 168 if (key->fn) { 169 fp = fopen(key->fn, "w"); 170 if (fp) { 171 PEM_write_PrivateKey(fp, key->key, 172 NULL, NULL, 0, NULL, NULL); 173 fclose(fp); 174 return 1; 175 } else { 176 ERROR("Cannot create file %s\n", key->fn); 177 } 178 } else { 179 ERROR("Key filename not specified\n"); 180 } 181 182 return 0; 183 } 184 185 int key_init(void) 186 { 187 cmd_opt_t cmd_opt; 188 key_t *key; 189 unsigned int i; 190 191 for (i = 0; i < num_keys; i++) { 192 key = &keys[i]; 193 if (key->opt != NULL) { 194 cmd_opt.long_opt.name = key->opt; 195 cmd_opt.long_opt.has_arg = required_argument; 196 cmd_opt.long_opt.flag = NULL; 197 cmd_opt.long_opt.val = CMD_OPT_KEY; 198 cmd_opt.help_msg = key->help_msg; 199 cmd_opt_add(&cmd_opt); 200 } 201 } 202 203 return 0; 204 } 205 206 key_t *key_get_by_opt(const char *opt) 207 { 208 key_t *key; 209 unsigned int i; 210 211 /* Sequential search. This is not a performance concern since the number 212 * of keys is bounded and the code runs on a host machine */ 213 for (i = 0; i < num_keys; i++) { 214 key = &keys[i]; 215 if (0 == strcmp(key->opt, opt)) { 216 return key; 217 } 218 } 219 220 return NULL; 221 } 222
