1 /* Copyright (c) 2014 The Chromium OS Authors. All rights reserved. 2 * Use of this source code is governed by a BSD-style license that can be 3 * found in the LICENSE file. 4 * 5 * Host functions for keyblocks 6 */ 7 8 #include "2sysincludes.h" 9 #include "2common.h" 10 #include "2rsa.h" 11 #include "host_common.h" 12 #include "host_fw_preamble2.h" 13 #include "host_key2.h" 14 #include "host_keyblock2.h" 15 #include "host_misc.h" 16 #include "host_signature2.h" 17 #include "vb2_common.h" 18 19 int vb2_fw_preamble_create(struct vb2_fw_preamble **fp_ptr, 20 const struct vb2_private_key *signing_key, 21 const struct vb2_signature **hash_list, 22 uint32_t hash_count, 23 uint32_t fw_version, 24 uint32_t flags, 25 const char *desc) 26 { 27 struct vb2_fw_preamble fp = { 28 .c.magic = VB2_MAGIC_FW_PREAMBLE, 29 .c.struct_version_major = VB2_FW_PREAMBLE_VERSION_MAJOR, 30 .c.struct_version_minor = VB2_FW_PREAMBLE_VERSION_MAJOR, 31 .c.fixed_size = sizeof(fp), 32 .c.desc_size = vb2_desc_size(desc), 33 .flags = flags, 34 .fw_version = fw_version, 35 .hash_count = hash_count, 36 }; 37 38 uint32_t hash_next; 39 uint32_t sig_size; 40 uint8_t *buf; 41 int i; 42 43 *fp_ptr = NULL; 44 45 /* Determine component sizes */ 46 hash_next = fp.hash_offset = fp.c.fixed_size + fp.c.desc_size; 47 48 for (i = 0; i < hash_count; i++) 49 hash_next += hash_list[i]->c.total_size; 50 51 fp.sig_offset = hash_next; 52 53 if (vb2_sig_size_for_key(&sig_size, signing_key, NULL)) 54 return VB2_FW_PREAMBLE_CREATE_SIG_SIZE; 55 56 fp.c.total_size = fp.sig_offset + sig_size; 57 58 /* Allocate buffer and copy components */ 59 buf = calloc(fp.c.total_size, 1); 60 if (!buf) 61 return VB2_FW_PREAMBLE_CREATE_ALLOC; 62 63 memcpy(buf, &fp, sizeof(fp)); 64 if (fp.c.desc_size) 65 strcpy((char *)buf + fp.c.fixed_size, desc); 66 67 hash_next = fp.hash_offset; 68 for (i = 0; i < hash_count; i++) { 69 memcpy(buf + hash_next, hash_list[i], 70 hash_list[i]->c.total_size); 71 hash_next += hash_list[i]->c.total_size; 72 } 73 74 /* Sign the preamble */ 75 if (vb2_sign_object(buf, fp.sig_offset, signing_key, NULL)) { 76 free(buf); 77 return VB2_FW_PREAMBLE_CREATE_SIGN; 78 } 79 80 *fp_ptr = (struct vb2_fw_preamble *)buf; 81 return VB2_SUCCESS; 82 } 83
