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 #ifndef AUTH_H_ 32 #define AUTH_H_ 33 34 #include <stddef.h> 35 #include <stdint.h> 36 37 /* 38 * Authentication infrastructure for Trusted Boot 39 * 40 * This infrastructure provides an API to access the authentication module. This 41 * module will implement the required operations for Trusted Boot by creating an 42 * instance of the structure 'auth_mod_t'. This instance must be called 43 * 'auth_mod' and must provide the functions to initialize the module and 44 * verify the authenticity of the images. 45 */ 46 47 /* Objects (images and certificates) involved in the TBB process */ 48 enum { 49 AUTH_BL2_IMG_CERT, 50 AUTH_BL2_IMG, 51 AUTH_TRUSTED_KEY_CERT, 52 AUTH_BL30_KEY_CERT, 53 AUTH_BL30_IMG_CERT, 54 AUTH_BL30_IMG, 55 AUTH_BL31_KEY_CERT, 56 AUTH_BL31_IMG_CERT, 57 AUTH_BL31_IMG, 58 AUTH_BL32_KEY_CERT, 59 AUTH_BL32_IMG_CERT, 60 AUTH_BL32_IMG, 61 AUTH_BL33_KEY_CERT, 62 AUTH_BL33_IMG_CERT, 63 AUTH_BL33_IMG, 64 AUTH_NUM_OBJ 65 }; 66 67 /* Authentication module structure */ 68 typedef struct auth_mod_s { 69 /* [mandatory] Module name. Printed to the log during initialization */ 70 const char *name; 71 72 /* [mandatory] Initialize the authentication module */ 73 int (*init)(void); 74 75 /* [mandatory] This function will be called to authenticate a new 76 * object loaded into memory. The obj_id corresponds to one of the 77 * values in the enumeration above */ 78 int (*verify)(unsigned int obj_id, uintptr_t obj_buf, size_t len); 79 } auth_mod_t; 80 81 /* This variable must be instantiated by the authentication module */ 82 extern const auth_mod_t auth_mod; 83 84 /* Public functions */ 85 void auth_init(void); 86 int auth_verify_obj(unsigned int obj_id, uintptr_t obj_buf, size_t len); 87 88 #endif /* AUTH_H_ */ 89