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/*
* Copyright (C) 2016 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <stdlib.h>
#include <fsl_caam.h>
#include <fuse.h>
#include "fsl_avb.h"
#include "fsl_avbkey.h"
#include "debug.h"
/* bank 15, GP7, 0xc80[31:0] */
#define AVBKEY_FUSE_BANK 15
#define AVBKEY_FUSE_WORD 0
#define AVBKEY_FUSE_MASK 0xffffffff
#define AVBKEY_FUSE_INIT 0x4156424b /* 'avbk' */
static int encrypt_write(uint8_t *plain, uint32_t len, const char * part, size_t offset) {
uint8_t *blb;
uint32_t blbsize;
int ret;
blbsize = len + AVB_CAAM_PAD;
blb = (uint8_t *)malloc(blbsize);
if (blb == NULL)
return -1;
caam_open();
if (caam_gen_blob((uint32_t)plain, (uint32_t)blb, len)) {
ret = -1;
goto fail;
}
if (fsl_write_to_partition(NULL, part, offset, blbsize,
(void *)blb) != AVB_IO_RESULT_OK) {
ret = -1;
goto fail;
}
ret = 0;
fail:
free(blb);
return ret;
}
int rbkidx_erase(const char * kblb_part) {
int i;
size_t num_read;
kblb_hdr_t hdr;
kblb_tag_t *tag;
/* read the kblb header */
if (fsl_read_from_partition(NULL, kblb_part, 0, sizeof(hdr),
(void *)&hdr, &num_read) != AVB_IO_RESULT_OK) {
ERR("read partition avbkey error\n");
return -1;
}
if (num_read != sizeof(hdr) ||
memcmp(hdr.magic, AVB_KBLB_MAGIC, AVB_KBLB_MAGIC_LEN) != 0) {
ERR("avbkey partition magic not match\n");
return -1;
}
/* reset rollback index */
uint32_t offset = AVB_RBIDX_START;
uint32_t rbidx_len = AVB_RBIDX_LEN;
uint8_t *rbidx = malloc(rbidx_len);
if (rbidx == NULL)
return -1;
memset(rbidx, 0, rbidx_len);
*(uint64_t *)rbidx = AVB_RBIDX_INITVAL;
for (i = 0; i < AVB_MAX_NUMBER_OF_ROLLBACK_INDEX_SLOTS; i++) {
tag = &hdr.rbk_tags[i];
tag->flag = AVB_RBIDX_FLAG;
tag->offset = offset;
tag->len = rbidx_len;
/* caam encrypt and write */
if (encrypt_write(rbidx, tag->len, kblb_part, tag->offset) != 0) {
ERR("write rollback index keyblob error\n");
free(rbidx);
return -1;
}
offset += AVB_RBIDX_ALIGN;
}
free(rbidx);
/* write hdr */
if (fsl_write_to_partition(NULL, kblb_part, 0,
sizeof(hdr), (void *)&hdr) != AVB_IO_RESULT_OK) {
ERR("write avbkey hdr error\n");
return -1;
}
return 0;
}
int avbkeyblb_init(uint8_t *plainkey, uint32_t keylen, const char * kblb_part) {
int i;
kblb_hdr_t hdr;
kblb_tag_t *tag;
uint32_t fuse_val;
/* read fuse to check enable init */
/* fuse_read read the shadow reg of fuse
* use fuse_sense to real read fuse */
#ifdef CONFIG_AVB_FUSE
if (fuse_sense(AVBKEY_FUSE_BANK, AVBKEY_FUSE_WORD, &fuse_val)) {
#else
if (fuse_read(AVBKEY_FUSE_BANK, AVBKEY_FUSE_WORD, &fuse_val)) {
#endif
ERR("read fuse error\n");
return -1;
}
if ((fuse_val & AVBKEY_FUSE_MASK) == AVBKEY_FUSE_INIT) {
ERR("key already init\n");
return -1;
}
fuse_val = AVBKEY_FUSE_MASK & AVBKEY_FUSE_INIT;
/* write fuse to prevent init again */
/* fuse_override write the shadow reg of fuse
* use fuse_prog to PERMANENT write fuse */
#ifdef CONFIG_AVB_FUSE
if (fuse_prog(AVBKEY_FUSE_BANK, AVBKEY_FUSE_WORD, fuse_val)) {
#else
if (fuse_override(AVBKEY_FUSE_BANK, AVBKEY_FUSE_WORD, fuse_val)) {
#endif
ERR("write fuse error\n");
return -1;
}
assert(plainkey != NULL);
/* check overflow */
if (keylen > AVB_RBIDX_START - AVB_PUBKY_OFFSET) {
ERR("key len overflow\n");
return -1;
}
/* init pubkey */
tag = &hdr.pubk_tag;
tag->flag = AVB_PUBKY_FLAG;
tag->offset = AVB_PUBKY_OFFSET;
tag->len = keylen;
/* caam encrypt and write */
if (encrypt_write(plainkey, tag->len, kblb_part, tag->offset) != 0) {
ERR("write pubkey keyblob error\n");
return -1;
}
/* init rollback index */
uint32_t offset = AVB_RBIDX_START;
uint32_t rbidx_len = AVB_RBIDX_LEN;
uint8_t *rbidx = malloc(rbidx_len);
if (rbidx == NULL)
return -1;
memset(rbidx, 0, rbidx_len);
*(uint64_t *)rbidx = AVB_RBIDX_INITVAL;
for (i = 0; i < AVB_MAX_NUMBER_OF_ROLLBACK_INDEX_SLOTS; i++) {
tag = &hdr.rbk_tags[i];
tag->flag = AVB_RBIDX_FLAG;
tag->offset = offset;
tag->len = rbidx_len;
/* caam encrypt and write */
if (encrypt_write(rbidx, tag->len, kblb_part, tag->offset) != 0) {
ERR("write rollback index keyblob error\n");
free(rbidx);
return -1;
}
offset += AVB_RBIDX_ALIGN;
}
free(rbidx);
/* init hdr */
memcpy(hdr.magic, AVB_KBLB_MAGIC, AVB_KBLB_MAGIC_LEN);
if (fsl_write_to_partition(NULL, kblb_part, 0,
sizeof(hdr), (void *)&hdr) != AVB_IO_RESULT_OK) {
ERR("write avbkey hdr error\n");
return -1;
}
return 0;
}
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