1 /* 2 * Copyright (c) 2015-2020, 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 #include "cert.h" 17 #include "cmd_opt.h" 18 #include "debug.h" 19 #include "key.h" 20 #include "sha.h" 21 22 #define MAX_FILENAME_LEN 1024 23 24 /* 25 * Create a new key container 26 */ 27 int key_new(key_t *key) 28 { 29 /* Create key pair container */ 30 key->key = EVP_PKEY_new(); 31 if (key->key == NULL) { 32 return 0; 33 } 34 35 return 1; 36 } 37 38 static int key_create_rsa(key_t *key, int key_bits) 39 { 40 BIGNUM *e; 41 RSA *rsa = NULL; 42 43 e = BN_new(); 44 if (e == NULL) { 45 printf("Cannot create RSA exponent\n"); 46 goto err; 47 } 48 49 if (!BN_set_word(e, RSA_F4)) { 50 printf("Cannot assign RSA exponent\n"); 51 goto err; 52 } 53 54 rsa = RSA_new(); 55 if (rsa == NULL) { 56 printf("Cannot create RSA key\n"); 57 goto err; 58 } 59 60 if (!RSA_generate_key_ex(rsa, key_bits, e, NULL)) { 61 printf("Cannot generate RSA key\n"); 62 goto err; 63 } 64 65 if (!EVP_PKEY_assign_RSA(key->key, rsa)) { 66 printf("Cannot assign RSA key\n"); 67 goto err; 68 } 69 70 BN_free(e); 71 return 1; 72 err: 73 RSA_free(rsa); 74 BN_free(e); 75 return 0; 76 } 77 78 #ifndef OPENSSL_NO_EC 79 static int key_create_ecdsa(key_t *key, int key_bits) 80 { 81 EC_KEY *ec; 82 83 ec = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1); 84 if (ec == NULL) { 85 printf("Cannot create EC key\n"); 86 goto err; 87 } 88 if (!EC_KEY_generate_key(ec)) { 89 printf("Cannot generate EC key\n"); 90 goto err; 91 } 92 EC_KEY_set_flags(ec, EC_PKEY_NO_PARAMETERS); 93 EC_KEY_set_asn1_flag(ec, OPENSSL_EC_NAMED_CURVE); 94 if (!EVP_PKEY_assign_EC_KEY(key->key, ec)) { 95 printf("Cannot assign EC key\n"); 96 goto err; 97 } 98 99 return 1; 100 err: 101 EC_KEY_free(ec); 102 return 0; 103 } 104 #endif /* OPENSSL_NO_EC */ 105 106 typedef int (*key_create_fn_t)(key_t *key, int key_bits); 107 static const key_create_fn_t key_create_fn[KEY_ALG_MAX_NUM] = { 108 key_create_rsa, /* KEY_ALG_RSA */ 109 #ifndef OPENSSL_NO_EC 110 key_create_ecdsa, /* KEY_ALG_ECDSA */ 111 #endif /* OPENSSL_NO_EC */ 112 }; 113 114 int key_create(key_t *key, int type, int key_bits) 115 { 116 if (type >= KEY_ALG_MAX_NUM) { 117 printf("Invalid key type\n"); 118 return 0; 119 } 120 121 if (key_create_fn[type]) { 122 return key_create_fn[type](key, key_bits); 123 } 124 125 return 0; 126 } 127 128 int key_load(key_t *key, unsigned int *err_code) 129 { 130 FILE *fp; 131 EVP_PKEY *k; 132 133 if (key->fn) { 134 /* Load key from file */ 135 fp = fopen(key->fn, "r"); 136 if (fp) { 137 k = PEM_read_PrivateKey(fp, &key->key, NULL, NULL); 138 fclose(fp); 139 if (k) { 140 *err_code = KEY_ERR_NONE; 141 return 1; 142 } else { 143 ERROR("Cannot load key from %s\n", key->fn); 144 *err_code = KEY_ERR_LOAD; 145 } 146 } else { 147 WARN("Cannot open file %s\n", key->fn); 148 *err_code = KEY_ERR_OPEN; 149 } 150 } else { 151 WARN("Key filename not specified\n"); 152 *err_code = KEY_ERR_FILENAME; 153 } 154 155 return 0; 156 } 157 158 int key_store(key_t *key) 159 { 160 FILE *fp; 161 162 if (key->fn) { 163 fp = fopen(key->fn, "w"); 164 if (fp) { 165 PEM_write_PrivateKey(fp, key->key, 166 NULL, NULL, 0, NULL, NULL); 167 fclose(fp); 168 return 1; 169 } else { 170 ERROR("Cannot create file %s\n", key->fn); 171 } 172 } else { 173 ERROR("Key filename not specified\n"); 174 } 175 176 return 0; 177 } 178 179 int key_init(void) 180 { 181 cmd_opt_t cmd_opt; 182 key_t *key; 183 unsigned int i; 184 185 for (i = 0; i < num_keys; i++) { 186 key = &keys[i]; 187 if (key->opt != NULL) { 188 cmd_opt.long_opt.name = key->opt; 189 cmd_opt.long_opt.has_arg = required_argument; 190 cmd_opt.long_opt.flag = NULL; 191 cmd_opt.long_opt.val = CMD_OPT_KEY; 192 cmd_opt.help_msg = key->help_msg; 193 cmd_opt_add(&cmd_opt); 194 } 195 } 196 197 return 0; 198 } 199 200 key_t *key_get_by_opt(const char *opt) 201 { 202 key_t *key; 203 unsigned int i; 204 205 /* Sequential search. This is not a performance concern since the number 206 * of keys is bounded and the code runs on a host machine */ 207 for (i = 0; i < num_keys; i++) { 208 key = &keys[i]; 209 if (0 == strcmp(key->opt, opt)) { 210 return key; 211 } 212 } 213 214 return NULL; 215 } 216