1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright 2015 Freescale Semiconductor, Inc.
9 #include <fsl_validate.h>
10 #include <fsl_secboot_err.h>
16 #include <u-boot/rsa-mod-exp.h>
18 #include <fsl_secboot_err.h>
19 #ifdef CONFIG_ARCH_LS1021A
20 #include <asm/arch/immap_ls102xa.h>
23 #define SHA256_BITS 256
24 #define SHA256_BYTES (256/8)
25 #define SHA256_NIBBLES (256/4)
26 #define NUM_HEX_CHARS (sizeof(ulong) * 2)
28 #define CHECK_KEY_LEN(key_len) (((key_len) == 2 * KEY_SIZE_BYTES / 4) || \
29 ((key_len) == 2 * KEY_SIZE_BYTES / 2) || \
30 ((key_len) == 2 * KEY_SIZE_BYTES))
31 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
32 /* Global data structure */
33 static struct fsl_secboot_glb glb;
36 /* This array contains DER value for SHA-256 */
37 static const u8 hash_identifier[] = { 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60,
38 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00,
42 static u8 hash_val[SHA256_BYTES];
44 #ifdef CONFIG_ESBC_HDR_LS
45 /* New Barker Code for LS ESBC Header */
46 static const u8 barker_code[ESBC_BARKER_LEN] = { 0x12, 0x19, 0x20, 0x01 };
48 static const u8 barker_code[ESBC_BARKER_LEN] = { 0x68, 0x39, 0x27, 0x81 };
51 void branch_to_self(void) __attribute__ ((noreturn));
54 * This function will put core in infinite loop.
55 * This will be called when the ESBC can not proceed further due
56 * to some unknown errors.
58 void branch_to_self(void)
60 printf("Core is in infinite loop due to errors.\n");
65 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
66 static u32 check_ie(struct fsl_secboot_img_priv *img)
68 if (img->hdr.ie_flag & IE_FLAG_MASK)
74 /* This function returns the CSF Header Address of uboot
75 * For MPC85xx based platforms, the LAW mapping for NOR
76 * flash changes in uboot code. Hence the offset needs
77 * to be calculated and added to the new NOR flash base
80 #if defined(CONFIG_MPC85xx)
81 int get_csf_base_addr(u32 *csf_addr, u32 *flash_base_addr)
83 struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
84 u32 csf_hdr_addr = in_be32(&gur->scratchrw[0]);
85 u32 csf_flash_offset = csf_hdr_addr & ~(CONFIG_SYS_PBI_FLASH_BASE);
90 for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
91 flash_addr = flash_info[i].start[0];
92 addr = flash_info[i].start[0] + csf_flash_offset;
93 if (memcmp((u8 *)addr, barker_code, ESBC_BARKER_LEN) == 0) {
94 debug("Barker found on addr %x\n", addr);
104 *flash_base_addr = flash_addr;
109 /* For platforms like LS1020, correct flash address is present in
110 * the header. So the function reqturns flash base address as 0
112 int get_csf_base_addr(u32 *csf_addr, u32 *flash_base_addr)
114 struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
115 u32 csf_hdr_addr = in_be32(&gur->scratchrw[0]);
117 if (memcmp((u8 *)(uintptr_t)csf_hdr_addr,
118 barker_code, ESBC_BARKER_LEN))
121 *csf_addr = csf_hdr_addr;
122 *flash_base_addr = 0;
127 #if defined(CONFIG_ESBC_HDR_LS)
128 static int get_ie_info_addr(uintptr_t *ie_addr)
130 struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
131 /* For LS-CH3, the address of IE Table is
132 * stated in Scratch13 and scratch14 of DCFG.
133 * Bootrom validates this table while validating uboot.
135 *ie_addr = in_le32(&gur->scratchrw[SCRATCH_IE_HIGH_ADR - 1]);
136 *ie_addr = *ie_addr << 32;
137 *ie_addr |= in_le32(&gur->scratchrw[SCRATCH_IE_LOW_ADR - 1]);
140 #else /* CONFIG_ESBC_HDR_LS */
141 static int get_ie_info_addr(uintptr_t *ie_addr)
143 struct fsl_secboot_img_hdr *hdr;
144 struct fsl_secboot_sg_table *sg_tbl;
145 u32 flash_base_addr, csf_addr;
147 if (get_csf_base_addr(&csf_addr, &flash_base_addr))
150 hdr = (struct fsl_secboot_img_hdr *)(uintptr_t)csf_addr;
152 /* For SoC's with Trust Architecture v1 with corenet bus
153 * the sg table field in CSF header has absolute address
154 * for sg table in memory. In other Trust Architecture,
155 * this field specifies the offset of sg table from the
156 * base address of CSF Header
158 #if defined(CONFIG_FSL_TRUST_ARCH_v1) && defined(CONFIG_FSL_CORENET)
159 sg_tbl = (struct fsl_secboot_sg_table *)
160 (((u32)hdr->psgtable & ~(CONFIG_SYS_PBI_FLASH_BASE)) +
163 sg_tbl = (struct fsl_secboot_sg_table *)(uintptr_t)(csf_addr +
167 /* IE Key Table is the first entry in the SG Table */
168 #if defined(CONFIG_MPC85xx)
169 *ie_addr = (uintptr_t)((sg_tbl->src_addr &
170 ~(CONFIG_SYS_PBI_FLASH_BASE)) +
173 *ie_addr = (uintptr_t)sg_tbl->src_addr;
176 debug("IE Table address is %lx\n", *ie_addr);
179 #endif /* CONFIG_ESBC_HDR_LS */
182 #ifdef CONFIG_KEY_REVOCATION
183 /* This function checks srk_table_flag in header and set/reset srk_flag.*/
184 static u32 check_srk(struct fsl_secboot_img_priv *img)
186 #ifdef CONFIG_ESBC_HDR_LS
187 /* In LS, No SRK Flag as SRK is always present if IE not present*/
188 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
189 return !check_ie(img);
193 if (img->hdr.len_kr.srk_table_flag & SRK_FLAG)
200 /* This function returns ospr's key_revoc values.*/
201 static u32 get_key_revoc(void)
203 struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
204 return (sfp_in32(&sfp_regs->ospr) & OSPR_KEY_REVOC_MASK) >>
205 OSPR_KEY_REVOC_SHIFT;
208 /* This function checks if selected key is revoked or not.*/
209 static u32 is_key_revoked(u32 keynum, u32 rev_flag)
211 if (keynum == UNREVOCABLE_KEY)
214 if ((u32)(1 << (ALIGN_REVOC_KEY - keynum)) & rev_flag)
220 /* It read validates srk_table key lengths.*/
221 static u32 read_validate_srk_tbl(struct fsl_secboot_img_priv *img)
224 u32 ret, key_num, key_revoc_flag, size;
225 struct fsl_secboot_img_hdr *hdr = &img->hdr;
226 void *esbc = (u8 *)(uintptr_t)img->ehdrloc;
228 if ((hdr->len_kr.num_srk == 0) ||
229 (hdr->len_kr.num_srk > MAX_KEY_ENTRIES))
230 return ERROR_ESBC_CLIENT_HEADER_INVALID_SRK_NUM_ENTRY;
232 key_num = hdr->len_kr.srk_sel;
233 if (key_num == 0 || key_num > hdr->len_kr.num_srk)
234 return ERROR_ESBC_CLIENT_HEADER_INVALID_KEY_NUM;
236 /* Get revoc key from sfp */
237 key_revoc_flag = get_key_revoc();
238 ret = is_key_revoked(key_num, key_revoc_flag);
240 return ERROR_ESBC_CLIENT_HEADER_KEY_REVOKED;
242 size = hdr->len_kr.num_srk * sizeof(struct srk_table);
244 memcpy(&img->srk_tbl, esbc + hdr->srk_tbl_off, size);
246 for (i = 0; i < hdr->len_kr.num_srk; i++) {
247 if (!CHECK_KEY_LEN(img->srk_tbl[i].key_len))
248 return ERROR_ESBC_CLIENT_HEADER_INV_SRK_ENTRY_KEYLEN;
251 img->key_len = img->srk_tbl[key_num - 1].key_len;
253 memcpy(&img->img_key, &(img->srk_tbl[key_num - 1].pkey),
260 #ifndef CONFIG_ESBC_HDR_LS
261 static u32 read_validate_single_key(struct fsl_secboot_img_priv *img)
263 struct fsl_secboot_img_hdr *hdr = &img->hdr;
264 void *esbc = (u8 *)(uintptr_t)img->ehdrloc;
266 /* check key length */
267 if (!CHECK_KEY_LEN(hdr->key_len))
268 return ERROR_ESBC_CLIENT_HEADER_KEY_LEN;
270 memcpy(&img->img_key, esbc + hdr->pkey, hdr->key_len);
272 img->key_len = hdr->key_len;
276 #endif /* CONFIG_ESBC_HDR_LS */
278 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
280 static void install_ie_tbl(uintptr_t ie_tbl_addr,
281 struct fsl_secboot_img_priv *img)
283 /* Copy IE tbl to Global Data */
284 memcpy(&glb.ie_tbl, (u8 *)ie_tbl_addr, sizeof(struct ie_key_info));
285 img->ie_addr = (uintptr_t)&glb.ie_tbl;
286 glb.ie_addr = img->ie_addr;
289 static u32 read_validate_ie_tbl(struct fsl_secboot_img_priv *img)
291 struct fsl_secboot_img_hdr *hdr = &img->hdr;
292 u32 ie_key_len, ie_revoc_flag, ie_num;
293 struct ie_key_info *ie_info;
296 if (get_ie_info_addr(&img->ie_addr))
297 return ERROR_IE_TABLE_NOT_FOUND;
299 install_ie_tbl(img->ie_addr, img);
302 ie_info = (struct ie_key_info *)(uintptr_t)img->ie_addr;
303 if (ie_info->num_keys == 0 || ie_info->num_keys > 32)
304 return ERROR_ESBC_CLIENT_HEADER_INVALID_IE_NUM_ENTRY;
306 ie_num = hdr->ie_key_sel;
307 if (ie_num == 0 || ie_num > ie_info->num_keys)
308 return ERROR_ESBC_CLIENT_HEADER_INVALID_IE_KEY_NUM;
310 ie_revoc_flag = ie_info->key_revok;
311 if ((u32)(1 << (ie_num - 1)) & ie_revoc_flag)
312 return ERROR_ESBC_CLIENT_HEADER_IE_KEY_REVOKED;
314 ie_key_len = ie_info->ie_key_tbl[ie_num - 1].key_len;
316 if (!CHECK_KEY_LEN(ie_key_len))
317 return ERROR_ESBC_CLIENT_HEADER_INV_IE_ENTRY_KEYLEN;
319 memcpy(&img->img_key, &(ie_info->ie_key_tbl[ie_num - 1].pkey),
322 img->key_len = ie_key_len;
328 /* This function return length of public key.*/
329 static inline u32 get_key_len(struct fsl_secboot_img_priv *img)
335 * Handles the ESBC uboot client header verification failure.
336 * This function handles all the errors which might occur in the
337 * parsing and checking of ESBC uboot client header. It will also
338 * set the error bits in the SEC_MON.
340 static void fsl_secboot_header_verification_failure(void)
342 struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
344 /* 29th bit of OSPR is ITS */
345 u32 its = sfp_in32(&sfp_regs->ospr) >> 2;
348 set_sec_mon_state(HPSR_SSM_ST_SOFT_FAIL);
350 set_sec_mon_state(HPSR_SSM_ST_NON_SECURE);
352 printf("Generating reset request\n");
353 do_reset(NULL, 0, 0, NULL);
354 /* If reset doesn't coocur, halt execution */
355 do_esbc_halt(NULL, 0, 0, NULL);
359 * Handles the ESBC uboot client image verification failure.
360 * This function handles all the errors which might occur in the
361 * public key hash comparison and signature verification of
362 * ESBC uboot client image. It will also
363 * set the error bits in the SEC_MON.
365 static void fsl_secboot_image_verification_failure(void)
367 struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
369 u32 its = (sfp_in32(&sfp_regs->ospr) & ITS_MASK) >> ITS_BIT;
372 set_sec_mon_state(HPSR_SSM_ST_SOFT_FAIL);
374 printf("Generating reset request\n");
375 do_reset(NULL, 0, 0, NULL);
376 /* If reset doesn't coocur, halt execution */
377 do_esbc_halt(NULL, 0, 0, NULL);
380 set_sec_mon_state(HPSR_SSM_ST_NON_SECURE);
384 static void fsl_secboot_bootscript_parse_failure(void)
386 fsl_secboot_header_verification_failure();
390 * Handles the errors in esbc boot.
391 * This function handles all the errors which might occur in the
392 * esbc boot phase. It will call the appropriate api to log the
393 * errors and set the error bits in the SEC_MON.
395 void fsl_secboot_handle_error(int error)
397 #ifndef CONFIG_SPL_BUILD
398 const struct fsl_secboot_errcode *e;
400 for (e = fsl_secboot_errcodes; e->errcode != ERROR_ESBC_CLIENT_MAX;
402 if (e->errcode == error)
403 printf("ERROR :: %x :: %s\n", error, e->name);
406 printf("ERROR :: %x\n", error);
409 /* If Boot Mode is secure, transition the SNVS state and issue
410 * reset based on type of failure and ITS setting.
411 * If Boot mode is non-secure, return from this function.
413 if (fsl_check_boot_mode_secure() == 0)
417 case ERROR_ESBC_CLIENT_HEADER_BARKER:
418 case ERROR_ESBC_CLIENT_HEADER_IMG_SIZE:
419 case ERROR_ESBC_CLIENT_HEADER_KEY_LEN:
420 case ERROR_ESBC_CLIENT_HEADER_SIG_LEN:
421 case ERROR_ESBC_CLIENT_HEADER_KEY_LEN_NOT_TWICE_SIG_LEN:
422 case ERROR_ESBC_CLIENT_HEADER_KEY_MOD_1:
423 case ERROR_ESBC_CLIENT_HEADER_KEY_MOD_2:
424 case ERROR_ESBC_CLIENT_HEADER_SIG_KEY_MOD:
425 case ERROR_ESBC_CLIENT_HEADER_SG_ESBC_EP:
426 case ERROR_ESBC_CLIENT_HEADER_SG_ENTIRES_BAD:
427 case ERROR_KEY_TABLE_NOT_FOUND:
428 #ifdef CONFIG_KEY_REVOCATION
429 case ERROR_ESBC_CLIENT_HEADER_KEY_REVOKED:
430 case ERROR_ESBC_CLIENT_HEADER_INVALID_SRK_NUM_ENTRY:
431 case ERROR_ESBC_CLIENT_HEADER_INVALID_KEY_NUM:
432 case ERROR_ESBC_CLIENT_HEADER_INV_SRK_ENTRY_KEYLEN:
434 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
436 case ERROR_ESBC_CLIENT_HEADER_IE_KEY_REVOKED:
437 case ERROR_ESBC_CLIENT_HEADER_INVALID_IE_NUM_ENTRY:
438 case ERROR_ESBC_CLIENT_HEADER_INVALID_IE_KEY_NUM:
439 case ERROR_ESBC_CLIENT_HEADER_INV_IE_ENTRY_KEYLEN:
440 case ERROR_IE_TABLE_NOT_FOUND:
442 fsl_secboot_header_verification_failure();
444 case ERROR_ESBC_SEC_RESET:
445 case ERROR_ESBC_SEC_DEQ:
446 case ERROR_ESBC_SEC_ENQ:
447 case ERROR_ESBC_SEC_DEQ_TO:
448 case ERROR_ESBC_SEC_JOBQ_STATUS:
449 case ERROR_ESBC_CLIENT_HASH_COMPARE_KEY:
450 case ERROR_ESBC_CLIENT_HASH_COMPARE_EM:
451 fsl_secboot_image_verification_failure();
453 case ERROR_ESBC_MISSING_BOOTM:
454 fsl_secboot_bootscript_parse_failure();
456 case ERROR_ESBC_WRONG_CMD:
463 static void fsl_secblk_handle_error(int error)
466 case ERROR_ESBC_SEC_ENQ:
467 fsl_secboot_handle_error(ERROR_ESBC_SEC_ENQ);
469 case ERROR_ESBC_SEC_DEQ:
470 fsl_secboot_handle_error(ERROR_ESBC_SEC_DEQ);
472 case ERROR_ESBC_SEC_DEQ_TO:
473 fsl_secboot_handle_error(ERROR_ESBC_SEC_DEQ_TO);
476 printf("Job Queue Output status %x\n", error);
477 fsl_secboot_handle_error(ERROR_ESBC_SEC_JOBQ_STATUS);
483 * Calculate hash of key obtained via offset present in ESBC uboot
484 * client hdr. This function calculates the hash of key which is obtained
485 * through offset present in ESBC uboot client header.
487 static int calc_img_key_hash(struct fsl_secboot_img_priv *img)
489 struct hash_algo *algo;
493 const char *algo_name = "sha256";
495 /* Calculate hash of the esbc key */
496 ret = hash_progressive_lookup_algo(algo_name, &algo);
500 ret = algo->hash_init(algo, &ctx);
504 /* Update hash for ESBC key */
505 #ifdef CONFIG_KEY_REVOCATION
506 if (check_srk(img)) {
507 ret = algo->hash_update(algo, ctx,
508 (u8 *)(uintptr_t)(img->ehdrloc + img->hdr.srk_tbl_off),
509 img->hdr.len_kr.num_srk * sizeof(struct srk_table), 1);
514 ret = algo->hash_update(algo, ctx,
515 img->img_key, img->key_len, 1);
519 /* Copy hash at destination buffer */
520 ret = algo->hash_finish(algo, ctx, hash_val, algo->digest_size);
524 for (i = 0; i < SHA256_BYTES; i++)
525 img->img_key_hash[i] = hash_val[i];
531 * Calculate hash of ESBC hdr and ESBC. This function calculates the
532 * single hash of ESBC header and ESBC image. If SG flag is on, all
533 * SG entries are also hashed alongwith the complete SG table.
535 static int calc_esbchdr_esbc_hash(struct fsl_secboot_img_priv *img)
537 struct hash_algo *algo;
541 const char *algo_name = "sha256";
543 /* Calculate the hash of the ESBC */
544 ret = hash_progressive_lookup_algo(algo_name, &algo);
548 ret = algo->hash_init(algo, &ctx);
549 /* Copy hash at destination buffer */
553 /* Update hash for CSF Header */
554 ret = algo->hash_update(algo, ctx,
555 (u8 *)&img->hdr, sizeof(struct fsl_secboot_img_hdr), 0);
559 /* Update the hash with that of srk table if srk flag is 1
560 * If IE Table is selected, key is not added in the hash
561 * If neither srk table nor IE key table available, add key
562 * from header in the hash calculation
564 #ifdef CONFIG_KEY_REVOCATION
565 if (check_srk(img)) {
566 ret = algo->hash_update(algo, ctx,
567 (u8 *)(uintptr_t)(img->ehdrloc + img->hdr.srk_tbl_off),
568 img->hdr.len_kr.num_srk * sizeof(struct srk_table), 0);
572 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
573 if (!key_hash && check_ie(img))
576 #ifndef CONFIG_ESBC_HDR_LS
577 /* No single key support in LS ESBC header */
579 ret = algo->hash_update(algo, ctx,
580 img->img_key, img->hdr.key_len, 0);
587 return ERROR_KEY_TABLE_NOT_FOUND;
589 /* Update hash for actual Image */
590 ret = algo->hash_update(algo, ctx,
591 (u8 *)(*(img->img_addr_ptr)), img->img_size, 1);
595 /* Copy hash at destination buffer */
596 ret = algo->hash_finish(algo, ctx, hash_val, algo->digest_size);
604 * Construct encoded hash EM' wrt PKCSv1.5. This function calculates the
605 * pointers for padding, DER value and hash. And finally, constructs EM'
606 * which includes hash of complete CSF header and ESBC image. If SG flag
607 * is on, hash of SG table and entries is also included.
609 static void construct_img_encoded_hash_second(struct fsl_secboot_img_priv *img)
612 * RSA PKCSv1.5 encoding format for encoded message is below
613 * EM = 0x0 || 0x1 || PS || 0x0 || DER || Hash
614 * PS is Padding String
615 * DER is DER value for SHA-256
616 * Hash is SHA-256 hash
617 * *********************************************************
618 * representative points to first byte of EM initially and is
620 * representative is incremented by 1 and second byte is filled
622 * padding points to third byte of EM
623 * digest points to full length of EM - 32 bytes
624 * hash_id (DER value) points to 19 bytes before pDigest
625 * separator is one byte which separates padding and DER
630 u8 *padding, *digest;
631 u8 *hash_id, *separator;
634 len = (get_key_len(img) / 2) - 1;
635 representative = img->img_encoded_hash_second;
636 representative[0] = 0;
637 representative[1] = 1; /* block type 1 */
639 padding = &representative[2];
640 digest = &representative[1] + len - 32;
641 hash_id = digest - sizeof(hash_identifier);
642 separator = hash_id - 1;
644 /* fill padding area pointed by padding with 0xff */
645 memset(padding, 0xff, separator - padding);
647 /* fill byte pointed by separator */
650 /* fill SHA-256 DER value pointed by HashId */
651 memcpy(hash_id, hash_identifier, sizeof(hash_identifier));
653 /* fill hash pointed by Digest */
654 for (i = 0; i < SHA256_BYTES; i++)
655 digest[i] = hash_val[i];
659 * Reads and validates the ESBC client header.
660 * This function reads key and signature from the ESBC client header.
661 * If Scatter/Gather flag is on, lengths and offsets of images
662 * present as SG entries are also read. This function also checks
663 * whether the header is valid or not.
665 static int read_validate_esbc_client_header(struct fsl_secboot_img_priv *img)
667 struct fsl_secboot_img_hdr *hdr = &img->hdr;
668 void *esbc = (u8 *)(uintptr_t)img->ehdrloc;
674 /* check barker code */
675 if (memcmp(hdr->barker, barker_code, ESBC_BARKER_LEN))
676 return ERROR_ESBC_CLIENT_HEADER_BARKER;
678 /* If Image Address is not passed as argument to function,
679 * then Address and Size must be read from the Header.
681 if (*(img->img_addr_ptr) == 0) {
682 #ifdef CONFIG_ESBC_ADDR_64BIT
683 *(img->img_addr_ptr) = hdr->pimg64;
685 *(img->img_addr_ptr) = hdr->pimg;
690 return ERROR_ESBC_CLIENT_HEADER_IMG_SIZE;
692 img->img_size = hdr->img_size;
695 #ifdef CONFIG_KEY_REVOCATION
696 if (check_srk(img)) {
697 ret = read_validate_srk_tbl(img);
704 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
705 if (!key_found && check_ie(img)) {
706 ret = read_validate_ie_tbl(img);
712 #ifndef CONFIG_ESBC_HDR_LS
713 /* Single Key Feature not available in LS ESBC Header */
714 if (key_found == 0) {
715 ret = read_validate_single_key(img);
722 return ERROR_KEY_TABLE_NOT_FOUND;
725 if (get_key_len(img) == 2 * hdr->sign_len) {
726 /* check signature length */
727 if (!((hdr->sign_len == KEY_SIZE_BYTES / 4) ||
728 (hdr->sign_len == KEY_SIZE_BYTES / 2) ||
729 (hdr->sign_len == KEY_SIZE_BYTES)))
730 return ERROR_ESBC_CLIENT_HEADER_SIG_LEN;
732 return ERROR_ESBC_CLIENT_HEADER_KEY_LEN_NOT_TWICE_SIG_LEN;
735 memcpy(&img->img_sign, esbc + hdr->psign, hdr->sign_len);
736 /* No SG support in LS-CH3 */
737 #ifndef CONFIG_ESBC_HDR_LS
740 return ERROR_ESBC_CLIENT_HEADER_SG;
743 /* modulus most significant bit should be set */
744 k = (u8 *)&img->img_key;
746 if ((k[0] & 0x80) == 0)
747 return ERROR_ESBC_CLIENT_HEADER_KEY_MOD_1;
749 /* modulus value should be odd */
750 if ((k[get_key_len(img) / 2 - 1] & 0x1) == 0)
751 return ERROR_ESBC_CLIENT_HEADER_KEY_MOD_2;
753 /* Check signature value < modulus value */
754 s = (u8 *)&img->img_sign;
756 if (!(memcmp(s, k, hdr->sign_len) < 0))
757 return ERROR_ESBC_CLIENT_HEADER_SIG_KEY_MOD;
759 return ESBC_VALID_HDR;
762 static inline int str2longbe(const char *p, ulong *num)
770 tmp = simple_strtoul(p, &endptr, 16);
771 if (sizeof(ulong) == 4)
772 *num = cpu_to_be32(tmp);
774 *num = cpu_to_be64(tmp);
777 return *p != '\0' && *endptr == '\0';
779 /* Function to calculate the ESBC Image Hash
780 * and hash from Digital signature.
781 * The Two hash's are compared to yield the
782 * result of signature validation.
784 static int calculate_cmp_img_sig(struct fsl_secboot_img_priv *img)
788 struct key_prop prop;
789 #if !defined(USE_HOSTCC)
790 struct udevice *mod_exp_dev;
792 ret = calc_esbchdr_esbc_hash(img);
796 /* Construct encoded hash EM' wrt PKCSv1.5 */
797 construct_img_encoded_hash_second(img);
799 /* Fill prop structure for public key */
800 memset(&prop, 0, sizeof(struct key_prop));
801 key_len = get_key_len(img) / 2;
802 prop.modulus = img->img_key;
803 prop.public_exponent = img->img_key + key_len;
804 prop.num_bits = key_len * 8;
805 prop.exp_len = key_len;
807 ret = uclass_get_device(UCLASS_MOD_EXP, 0, &mod_exp_dev);
809 printf("RSA: Can't find Modular Exp implementation\n");
813 ret = rsa_mod_exp(mod_exp_dev, img->img_sign, img->hdr.sign_len,
814 &prop, img->img_encoded_hash);
819 * compare the encoded messages EM' and EM wrt RSA PKCSv1.5
820 * memcmp returns zero on success
821 * memcmp returns non-zero on failure
823 ret = memcmp(&img->img_encoded_hash_second, &img->img_encoded_hash,
827 return ERROR_ESBC_CLIENT_HASH_COMPARE_EM;
831 /* Function to initialize img priv and global data structure
833 static int secboot_init(struct fsl_secboot_img_priv **img_ptr)
835 *img_ptr = malloc(sizeof(struct fsl_secboot_img_priv));
837 struct fsl_secboot_img_priv *img = *img_ptr;
841 memset(img, 0, sizeof(struct fsl_secboot_img_priv));
843 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
845 img->ie_addr = glb.ie_addr;
851 /* haddr - Address of the header of image to be validated.
852 * arg_hash_str - Option hash string. If provided, this
853 * overrides the key hash in the SFP fuses.
854 * img_addr_ptr - Optional pointer to address of image to be validated.
855 * If non zero addr, this overrides the addr of image in header,
856 * otherwise updated to image addr in header.
857 * Acts as both input and output of function.
858 * This pointer shouldn't be NULL.
860 int fsl_secboot_validate(uintptr_t haddr, char *arg_hash_str,
861 uintptr_t *img_addr_ptr)
863 struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
864 ulong hash[SHA256_BYTES/sizeof(ulong)];
865 char hash_str[NUM_HEX_CHARS + 1];
866 struct fsl_secboot_img_priv *img;
867 struct fsl_secboot_img_hdr *hdr;
869 int ret, i, hash_cmd = 0;
872 if (arg_hash_str != NULL) {
873 const char *cp = arg_hash_str;
876 if (*cp == '0' && *(cp + 1) == 'x')
879 /* The input string expected is in hex, where
880 * each 4 bits would be represented by a hex
881 * sha256 hash is 256 bits long, which would mean
882 * num of characters = 256 / 4
884 if (strlen(cp) != SHA256_NIBBLES) {
885 printf("%s is not a 256 bits hex string as expected\n",
890 for (i = 0; i < sizeof(hash)/sizeof(ulong); i++) {
891 strncpy(hash_str, cp + (i * NUM_HEX_CHARS),
893 hash_str[NUM_HEX_CHARS] = '\0';
894 if (!str2longbe(hash_str, &hash[i])) {
895 printf("%s is not a 256 bits hex string ",
904 ret = secboot_init(&img);
908 /* Update the information in Private Struct */
910 img->ehdrloc = haddr;
911 img->img_addr_ptr = img_addr_ptr;
912 esbc = (u8 *)img->ehdrloc;
914 memcpy(hdr, esbc, sizeof(struct fsl_secboot_img_hdr));
916 /* read and validate esbc header */
917 ret = read_validate_esbc_client_header(img);
919 if (ret != ESBC_VALID_HDR) {
920 fsl_secboot_handle_error(ret);
924 /* SRKH present in SFP */
925 for (i = 0; i < NUM_SRKH_REGS; i++)
926 srk_hash[i] = srk_in32(&sfp_regs->srk_hash[i]);
929 * Calculate hash of key obtained via offset present in
930 * ESBC uboot client hdr
932 ret = calc_img_key_hash(img);
934 fsl_secblk_handle_error(ret);
938 /* Compare hash obtained above with SRK hash present in SFP */
940 ret = memcmp(&hash, &img->img_key_hash, SHA256_BYTES);
942 ret = memcmp(srk_hash, img->img_key_hash, SHA256_BYTES);
944 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
945 if (!hash_cmd && check_ie(img))
950 fsl_secboot_handle_error(ERROR_ESBC_CLIENT_HASH_COMPARE_KEY);
954 ret = calculate_cmp_img_sig(img);
956 fsl_secboot_handle_error(ret);
961 /* Free Img as it was malloc'ed*/