1 /* 2 * SPDX-License-Identifier: Apache-2.0 3 * 4 * Copyright (c) 2016-2019 Linaro LTD 5 * Copyright (c) 2016-2019 JUUL Labs 6 * Copyright (c) 2019-2021 Arm Limited 7 * 8 * Original license: 9 * 10 * Licensed to the Apache Software Foundation (ASF) under one 11 * or more contributor license agreements. See the NOTICE file 12 * distributed with this work for additional information 13 * regarding copyright ownership. The ASF licenses this file 14 * to you under the Apache License, Version 2.0 (the 15 * "License"); you may not use this file except in compliance 16 * with the License. You may obtain a copy of the License at 17 * 18 * http://www.apache.org/licenses/LICENSE-2.0 19 * 20 * Unless required by applicable law or agreed to in writing, 21 * software distributed under the License is distributed on an 22 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 23 * KIND, either express or implied. See the License for the 24 * specific language governing permissions and limitations 25 * under the License. 26 */ 27 28 #ifndef H_IMAGE_ 29 #define H_IMAGE_ 30 31 #include <inttypes.h> 32 #include <stdbool.h> 33 #include "bootutil/fault_injection_hardening.h" 34 35 #ifdef __cplusplus 36 extern "C" { 37 #endif 38 39 struct flash_area; 40 41 #define IMAGE_MAGIC 0x96f3b83d 42 #define IMAGE_MAGIC_V1 0x96f3b83c 43 #define IMAGE_MAGIC_NONE 0xffffffff 44 #define IMAGE_TLV_INFO_MAGIC 0x6907 45 #define IMAGE_TLV_PROT_INFO_MAGIC 0x6908 46 47 #define IMAGE_HEADER_SIZE 32 48 49 /* 50 * Image header flags. 51 */ 52 #define IMAGE_F_PIC 0x00000001 /* Not supported. */ 53 #define IMAGE_F_ENCRYPTED_AES128 0x00000004 /* Encrypted using AES128. */ 54 #define IMAGE_F_ENCRYPTED_AES256 0x00000008 /* Encrypted using AES256. */ 55 #define IMAGE_F_NON_BOOTABLE 0x00000010 /* Split image app. */ 56 /* 57 * Indicates that this image should be loaded into RAM instead of run 58 * directly from flash. The address to load should be in the 59 * ih_load_addr field of the header. 60 */ 61 #define IMAGE_F_RAM_LOAD 0x00000020 62 63 /* 64 * Indicates that ih_load_addr stores information on flash/ROM address the 65 * image has been built for. 66 */ 67 #define IMAGE_F_ROM_FIXED 0x00000100 68 69 /* 70 * ECSDA224 is with NIST P-224 71 * ECSDA256 is with NIST P-256 72 */ 73 74 /* 75 * Image trailer TLV types. 76 * 77 * Signature is generated by computing signature over the image hash. 78 * Currently the only image hash type is SHA256. 79 * 80 * Signature comes in the form of 2 TLVs. 81 * 1st on identifies the public key which should be used to verify it. 82 * 2nd one is the actual signature. 83 */ 84 #define IMAGE_TLV_KEYHASH 0x01 /* hash of the public key */ 85 #define IMAGE_TLV_PUBKEY 0x02 /* public key */ 86 #define IMAGE_TLV_SHA256 0x10 /* SHA256 of image hdr and body */ 87 #define IMAGE_TLV_RSA2048_PSS 0x20 /* RSA2048 of hash output */ 88 #define IMAGE_TLV_ECDSA224 0x21 /* ECDSA of hash output */ 89 #define IMAGE_TLV_ECDSA256 0x22 /* ECDSA of hash output */ 90 #define IMAGE_TLV_RSA3072_PSS 0x23 /* RSA3072 of hash output */ 91 #define IMAGE_TLV_ED25519 0x24 /* ed25519 of hash output */ 92 #define IMAGE_TLV_ENC_RSA2048 0x30 /* Key encrypted with RSA-OAEP-2048 */ 93 #define IMAGE_TLV_ENC_KW 0x31 /* Key encrypted with AES-KW 128 or 256*/ 94 #define IMAGE_TLV_ENC_EC256 0x32 /* Key encrypted with ECIES-EC256 */ 95 #define IMAGE_TLV_ENC_X25519 0x33 /* Key encrypted with ECIES-X25519 */ 96 #define IMAGE_TLV_DEPENDENCY 0x40 /* Image depends on other image */ 97 #define IMAGE_TLV_SEC_CNT 0x50 /* security counter */ 98 #define IMAGE_TLV_BOOT_RECORD 0x60 /* measured boot record */ 99 /* 100 * vendor reserved TLVs at xxA0-xxFF, 101 * where xx denotes the upper byte 102 * range. Examples: 103 * 0x00a0 - 0x00ff 104 * 0x01a0 - 0x01ff 105 * 0x02a0 - 0x02ff 106 * ... 107 * 0xffa0 - 0xfffe 108 */ 109 #define IMAGE_TLV_ANY 0xffff /* Used to iterate over all TLV */ 110 111 struct image_version { 112 uint8_t iv_major; 113 uint8_t iv_minor; 114 uint16_t iv_revision; 115 uint32_t iv_build_num; 116 }; 117 118 struct image_dependency { 119 uint8_t image_id; /* Image index (from 0) */ 120 uint8_t _pad1; 121 uint16_t _pad2; 122 struct image_version image_min_version; /* Indicates at minimum which 123 * version of firmware must be 124 * available to satisfy compliance 125 */ 126 }; 127 128 /** Image header. All fields are in little endian byte order. */ 129 struct image_header { 130 uint32_t ih_magic; 131 uint32_t ih_load_addr; 132 uint16_t ih_hdr_size; /* Size of image header (bytes). */ 133 uint16_t ih_protect_tlv_size; /* Size of protected TLV area (bytes). */ 134 uint32_t ih_img_size; /* Does not include header. */ 135 uint32_t ih_flags; /* IMAGE_F_[...]. */ 136 struct image_version ih_ver; 137 uint32_t _pad1; 138 }; 139 140 /** Image TLV header. All fields in little endian. */ 141 struct image_tlv_info { 142 uint16_t it_magic; 143 uint16_t it_tlv_tot; /* size of TLV area (including tlv_info header) */ 144 }; 145 146 /** Image trailer TLV format. All fields in little endian. */ 147 struct image_tlv { 148 uint16_t it_type; /* IMAGE_TLV_[...]. */ 149 uint16_t it_len; /* Data length (not including TLV header). */ 150 }; 151 152 #define IS_ENCRYPTED(hdr) (((hdr)->ih_flags & IMAGE_F_ENCRYPTED_AES128) \ 153 || ((hdr)->ih_flags & IMAGE_F_ENCRYPTED_AES256)) 154 #define MUST_DECRYPT(fap, idx, hdr) \ 155 ((fap)->fa_id == FLASH_AREA_IMAGE_SECONDARY(idx) && IS_ENCRYPTED(hdr)) 156 157 _Static_assert(sizeof(struct image_header) == IMAGE_HEADER_SIZE, 158 "struct image_header not required size"); 159 160 struct enc_key_data; 161 fih_int bootutil_img_validate(struct enc_key_data *enc_state, int image_index, 162 struct image_header *hdr, 163 const struct flash_area *fap, 164 uint8_t *tmp_buf, uint32_t tmp_buf_sz, 165 uint8_t *seed, int seed_len, uint8_t *out_hash); 166 167 struct image_tlv_iter { 168 const struct image_header *hdr; 169 const struct flash_area *fap; 170 uint16_t type; 171 bool prot; 172 uint32_t prot_end; 173 uint32_t tlv_off; 174 uint32_t tlv_end; 175 }; 176 177 int bootutil_tlv_iter_begin(struct image_tlv_iter *it, 178 const struct image_header *hdr, 179 const struct flash_area *fap, uint16_t type, 180 bool prot); 181 int bootutil_tlv_iter_next(struct image_tlv_iter *it, uint32_t *off, 182 uint16_t *len, uint16_t *type); 183 184 int32_t bootutil_get_img_security_cnt(struct image_header *hdr, 185 const struct flash_area *fap, 186 uint32_t *security_cnt); 187 188 #ifdef __cplusplus 189 } 190 #endif 191 192 #endif 193
