1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright 2015 Freescale Semiconductor, Inc.
4 * Copyright 2021-2022 NXP
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>
24 #define SHA256_BITS 256
25 #define SHA256_BYTES (256/8)
26 #define SHA256_NIBBLES (256/4)
27 #define NUM_HEX_CHARS (sizeof(ulong) * 2)
29 #define CHECK_KEY_LEN(key_len) (((key_len) == 2 * KEY_SIZE_BYTES / 4) || \
30 ((key_len) == 2 * KEY_SIZE_BYTES / 2) || \
31 ((key_len) == 2 * KEY_SIZE_BYTES))
32 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
33 /* Global data structure */
34 static struct fsl_secboot_glb glb;
37 /* This array contains DER value for SHA-256 */
38 static const u8 hash_identifier[] = { 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60,
39 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00,
43 static u8 hash_val[SHA256_BYTES];
45 #ifdef CONFIG_ESBC_HDR_LS
46 /* New Barker Code for LS ESBC Header */
47 static const u8 barker_code[ESBC_BARKER_LEN] = { 0x12, 0x19, 0x20, 0x01 };
49 static const u8 barker_code[ESBC_BARKER_LEN] = { 0x68, 0x39, 0x27, 0x81 };
52 void branch_to_self(void) __attribute__ ((noreturn));
55 * This function will put core in infinite loop.
56 * This will be called when the ESBC can not proceed further due
57 * to some unknown errors.
59 void branch_to_self(void)
61 printf("Core is in infinite loop due to errors.\n");
66 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
67 static u32 check_ie(struct fsl_secboot_img_priv *img)
69 if (img->hdr.ie_flag & IE_FLAG_MASK)
75 /* This function returns the CSF Header Address of uboot
76 * For MPC85xx based platforms, the LAW mapping for NOR
77 * flash changes in uboot code. Hence the offset needs
78 * to be calculated and added to the new NOR flash base
81 #if defined(CONFIG_MPC85xx)
84 int get_csf_base_addr(u32 *csf_addr, u32 *flash_base_addr)
86 struct ccsr_gur __iomem *gur = (void *)(CFG_SYS_MPC85xx_GUTS_ADDR);
87 u32 csf_hdr_addr = in_be32(&gur->scratchrw[0]);
88 u32 csf_flash_offset = csf_hdr_addr & ~(CONFIG_SYS_PBI_FLASH_BASE);
93 for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
94 flash_addr = flash_info[i].start[0];
95 addr = flash_info[i].start[0] + csf_flash_offset;
96 if (memcmp((u8 *)addr, barker_code, ESBC_BARKER_LEN) == 0) {
97 debug("Barker found on addr %x\n", addr);
107 *flash_base_addr = flash_addr;
112 /* For platforms like LS1020, correct flash address is present in
113 * the header. So the function reqturns flash base address as 0
115 int get_csf_base_addr(u32 *csf_addr, u32 *flash_base_addr)
117 struct ccsr_gur __iomem *gur = (void *)(CFG_SYS_FSL_GUTS_ADDR);
118 u32 csf_hdr_addr = in_be32(&gur->scratchrw[0]);
120 if (memcmp((u8 *)(uintptr_t)csf_hdr_addr,
121 barker_code, ESBC_BARKER_LEN))
124 *csf_addr = csf_hdr_addr;
125 *flash_base_addr = 0;
130 #if defined(CONFIG_ESBC_HDR_LS)
131 static int get_ie_info_addr(uintptr_t *ie_addr)
133 struct ccsr_gur __iomem *gur = (void *)(CFG_SYS_FSL_GUTS_ADDR);
134 /* For LS-CH3, the address of IE Table is
135 * stated in Scratch13 and scratch14 of DCFG.
136 * Bootrom validates this table while validating uboot.
138 *ie_addr = in_le32(&gur->scratchrw[SCRATCH_IE_HIGH_ADR - 1]);
139 *ie_addr = *ie_addr << 32;
140 *ie_addr |= in_le32(&gur->scratchrw[SCRATCH_IE_LOW_ADR - 1]);
143 #else /* CONFIG_ESBC_HDR_LS */
144 static int get_ie_info_addr(uintptr_t *ie_addr)
146 struct fsl_secboot_img_hdr *hdr;
147 struct fsl_secboot_sg_table *sg_tbl;
148 u32 flash_base_addr, csf_addr;
150 if (get_csf_base_addr(&csf_addr, &flash_base_addr))
153 hdr = (struct fsl_secboot_img_hdr *)(uintptr_t)csf_addr;
155 /* For SoC's with Trust Architecture v1 with corenet bus
156 * the sg table field in CSF header has absolute address
157 * for sg table in memory. In other Trust Architecture,
158 * this field specifies the offset of sg table from the
159 * base address of CSF Header
161 #if defined(CONFIG_FSL_TRUST_ARCH_v1) && defined(CONFIG_FSL_CORENET)
162 sg_tbl = (struct fsl_secboot_sg_table *)
163 (((u32)hdr->psgtable & ~(CONFIG_SYS_PBI_FLASH_BASE)) +
166 sg_tbl = (struct fsl_secboot_sg_table *)(uintptr_t)(csf_addr +
170 /* IE Key Table is the first entry in the SG Table */
171 #if defined(CONFIG_MPC85xx)
172 *ie_addr = (uintptr_t)((sg_tbl->src_addr &
173 ~(CONFIG_SYS_PBI_FLASH_BASE)) +
176 *ie_addr = (uintptr_t)sg_tbl->src_addr;
179 debug("IE Table address is %lx\n", *ie_addr);
182 #endif /* CONFIG_ESBC_HDR_LS */
185 #ifdef CONFIG_KEY_REVOCATION
186 /* This function checks srk_table_flag in header and set/reset srk_flag.*/
187 static u32 check_srk(struct fsl_secboot_img_priv *img)
189 #ifdef CONFIG_ESBC_HDR_LS
190 /* In LS, No SRK Flag as SRK is always present if IE not present*/
191 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
192 return !check_ie(img);
196 if (img->hdr.len_kr.srk_table_flag & SRK_FLAG)
203 /* This function returns ospr's key_revoc values.*/
204 static u32 get_key_revoc(void)
206 struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
207 return (sfp_in32(&sfp_regs->ospr) & OSPR_KEY_REVOC_MASK) >>
208 OSPR_KEY_REVOC_SHIFT;
211 /* This function checks if selected key is revoked or not.*/
212 static u32 is_key_revoked(u32 keynum, u32 rev_flag)
214 if (keynum == UNREVOCABLE_KEY)
217 if ((u32)(1 << (ALIGN_REVOC_KEY - keynum)) & rev_flag)
223 /* It read validates srk_table key lengths.*/
224 static u32 read_validate_srk_tbl(struct fsl_secboot_img_priv *img)
227 u32 ret, key_num, key_revoc_flag, size;
228 struct fsl_secboot_img_hdr *hdr = &img->hdr;
229 void *esbc = (u8 *)(uintptr_t)img->ehdrloc;
231 if ((hdr->len_kr.num_srk == 0) ||
232 (hdr->len_kr.num_srk > MAX_KEY_ENTRIES))
233 return ERROR_ESBC_CLIENT_HEADER_INVALID_SRK_NUM_ENTRY;
235 key_num = hdr->len_kr.srk_sel;
236 if (key_num == 0 || key_num > hdr->len_kr.num_srk)
237 return ERROR_ESBC_CLIENT_HEADER_INVALID_KEY_NUM;
239 /* Get revoc key from sfp */
240 key_revoc_flag = get_key_revoc();
241 ret = is_key_revoked(key_num, key_revoc_flag);
243 return ERROR_ESBC_CLIENT_HEADER_KEY_REVOKED;
245 size = hdr->len_kr.num_srk * sizeof(struct srk_table);
247 memcpy(&img->srk_tbl, esbc + hdr->srk_tbl_off, size);
249 for (i = 0; i < hdr->len_kr.num_srk; i++) {
250 if (!CHECK_KEY_LEN(img->srk_tbl[i].key_len))
251 return ERROR_ESBC_CLIENT_HEADER_INV_SRK_ENTRY_KEYLEN;
254 img->key_len = img->srk_tbl[key_num - 1].key_len;
256 memcpy(&img->img_key, &(img->srk_tbl[key_num - 1].pkey),
263 #ifndef CONFIG_ESBC_HDR_LS
264 static u32 read_validate_single_key(struct fsl_secboot_img_priv *img)
266 struct fsl_secboot_img_hdr *hdr = &img->hdr;
267 void *esbc = (u8 *)(uintptr_t)img->ehdrloc;
269 /* check key length */
270 if (!CHECK_KEY_LEN(hdr->key_len))
271 return ERROR_ESBC_CLIENT_HEADER_KEY_LEN;
273 memcpy(&img->img_key, esbc + hdr->pkey, hdr->key_len);
275 img->key_len = hdr->key_len;
279 #endif /* CONFIG_ESBC_HDR_LS */
281 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
283 static void install_ie_tbl(uintptr_t ie_tbl_addr,
284 struct fsl_secboot_img_priv *img)
286 /* Copy IE tbl to Global Data */
287 memcpy(&glb.ie_tbl, (u8 *)ie_tbl_addr, sizeof(struct ie_key_info));
288 img->ie_addr = (uintptr_t)&glb.ie_tbl;
289 glb.ie_addr = img->ie_addr;
292 static u32 read_validate_ie_tbl(struct fsl_secboot_img_priv *img)
294 struct fsl_secboot_img_hdr *hdr = &img->hdr;
295 u32 ie_key_len, ie_revoc_flag, ie_num;
296 struct ie_key_info *ie_info;
299 if (get_ie_info_addr(&img->ie_addr))
300 return ERROR_IE_TABLE_NOT_FOUND;
302 install_ie_tbl(img->ie_addr, img);
305 ie_info = (struct ie_key_info *)(uintptr_t)img->ie_addr;
306 if (ie_info->num_keys == 0 || ie_info->num_keys > 32)
307 return ERROR_ESBC_CLIENT_HEADER_INVALID_IE_NUM_ENTRY;
309 ie_num = hdr->ie_key_sel;
310 if (ie_num == 0 || ie_num > ie_info->num_keys)
311 return ERROR_ESBC_CLIENT_HEADER_INVALID_IE_KEY_NUM;
313 ie_revoc_flag = ie_info->key_revok;
314 if ((u32)(1 << (ie_num - 1)) & ie_revoc_flag)
315 return ERROR_ESBC_CLIENT_HEADER_IE_KEY_REVOKED;
317 ie_key_len = ie_info->ie_key_tbl[ie_num - 1].key_len;
319 if (!CHECK_KEY_LEN(ie_key_len))
320 return ERROR_ESBC_CLIENT_HEADER_INV_IE_ENTRY_KEYLEN;
322 memcpy(&img->img_key, &(ie_info->ie_key_tbl[ie_num - 1].pkey),
325 img->key_len = ie_key_len;
331 /* This function return length of public key.*/
332 static inline u32 get_key_len(struct fsl_secboot_img_priv *img)
338 * Handles the ESBC uboot client header verification failure.
339 * This function handles all the errors which might occur in the
340 * parsing and checking of ESBC uboot client header. It will also
341 * set the error bits in the SEC_MON.
343 static void fsl_secboot_header_verification_failure(void)
345 struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
347 /* 29th bit of OSPR is ITS */
348 u32 its = sfp_in32(&sfp_regs->ospr) >> 2;
351 set_sec_mon_state(HPSR_SSM_ST_SOFT_FAIL);
353 set_sec_mon_state(HPSR_SSM_ST_NON_SECURE);
355 printf("Generating reset request\n");
356 do_reset(NULL, 0, 0, NULL);
357 /* If reset doesn't coocur, halt execution */
358 do_esbc_halt(NULL, 0, 0, NULL);
362 * Handles the ESBC uboot client image verification failure.
363 * This function handles all the errors which might occur in the
364 * public key hash comparison and signature verification of
365 * ESBC uboot client image. It will also
366 * set the error bits in the SEC_MON.
368 static void fsl_secboot_image_verification_failure(void)
370 struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
372 u32 its = (sfp_in32(&sfp_regs->ospr) & ITS_MASK) >> ITS_BIT;
375 set_sec_mon_state(HPSR_SSM_ST_SOFT_FAIL);
377 printf("Generating reset request\n");
378 do_reset(NULL, 0, 0, NULL);
379 /* If reset doesn't coocur, halt execution */
380 do_esbc_halt(NULL, 0, 0, NULL);
383 set_sec_mon_state(HPSR_SSM_ST_NON_SECURE);
387 static void fsl_secboot_bootscript_parse_failure(void)
389 fsl_secboot_header_verification_failure();
393 * Handles the errors in esbc boot.
394 * This function handles all the errors which might occur in the
395 * esbc boot phase. It will call the appropriate api to log the
396 * errors and set the error bits in the SEC_MON.
398 void fsl_secboot_handle_error(int error)
400 #ifndef CONFIG_SPL_BUILD
401 const struct fsl_secboot_errcode *e;
403 for (e = fsl_secboot_errcodes; e->errcode != ERROR_ESBC_CLIENT_MAX;
405 if (e->errcode == error)
406 printf("ERROR :: %x :: %s\n", error, e->name);
409 printf("ERROR :: %x\n", error);
412 /* If Boot Mode is secure, transition the SNVS state and issue
413 * reset based on type of failure and ITS setting.
414 * If Boot mode is non-secure, return from this function.
416 if (fsl_check_boot_mode_secure() == 0)
420 case ERROR_ESBC_CLIENT_HEADER_BARKER:
421 case ERROR_ESBC_CLIENT_HEADER_IMG_SIZE:
422 case ERROR_ESBC_CLIENT_HEADER_KEY_LEN:
423 case ERROR_ESBC_CLIENT_HEADER_SIG_LEN:
424 case ERROR_ESBC_CLIENT_HEADER_KEY_LEN_NOT_TWICE_SIG_LEN:
425 case ERROR_ESBC_CLIENT_HEADER_KEY_MOD_1:
426 case ERROR_ESBC_CLIENT_HEADER_KEY_MOD_2:
427 case ERROR_ESBC_CLIENT_HEADER_SIG_KEY_MOD:
428 case ERROR_ESBC_CLIENT_HEADER_SG_ESBC_EP:
429 case ERROR_ESBC_CLIENT_HEADER_SG_ENTIRES_BAD:
430 case ERROR_KEY_TABLE_NOT_FOUND:
431 #ifdef CONFIG_KEY_REVOCATION
432 case ERROR_ESBC_CLIENT_HEADER_KEY_REVOKED:
433 case ERROR_ESBC_CLIENT_HEADER_INVALID_SRK_NUM_ENTRY:
434 case ERROR_ESBC_CLIENT_HEADER_INVALID_KEY_NUM:
435 case ERROR_ESBC_CLIENT_HEADER_INV_SRK_ENTRY_KEYLEN:
437 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
439 case ERROR_ESBC_CLIENT_HEADER_IE_KEY_REVOKED:
440 case ERROR_ESBC_CLIENT_HEADER_INVALID_IE_NUM_ENTRY:
441 case ERROR_ESBC_CLIENT_HEADER_INVALID_IE_KEY_NUM:
442 case ERROR_ESBC_CLIENT_HEADER_INV_IE_ENTRY_KEYLEN:
443 case ERROR_IE_TABLE_NOT_FOUND:
445 fsl_secboot_header_verification_failure();
447 case ERROR_ESBC_SEC_RESET:
448 case ERROR_ESBC_SEC_DEQ:
449 case ERROR_ESBC_SEC_ENQ:
450 case ERROR_ESBC_SEC_DEQ_TO:
451 case ERROR_ESBC_SEC_JOBQ_STATUS:
452 case ERROR_ESBC_CLIENT_HASH_COMPARE_KEY:
453 case ERROR_ESBC_CLIENT_HASH_COMPARE_EM:
454 fsl_secboot_image_verification_failure();
456 case ERROR_ESBC_MISSING_BOOTM:
457 fsl_secboot_bootscript_parse_failure();
459 case ERROR_ESBC_WRONG_CMD:
466 static void fsl_secblk_handle_error(int error)
469 case ERROR_ESBC_SEC_ENQ:
470 fsl_secboot_handle_error(ERROR_ESBC_SEC_ENQ);
472 case ERROR_ESBC_SEC_DEQ:
473 fsl_secboot_handle_error(ERROR_ESBC_SEC_DEQ);
475 case ERROR_ESBC_SEC_DEQ_TO:
476 fsl_secboot_handle_error(ERROR_ESBC_SEC_DEQ_TO);
479 printf("Job Queue Output status %x\n", error);
480 fsl_secboot_handle_error(ERROR_ESBC_SEC_JOBQ_STATUS);
486 * Calculate hash of key obtained via offset present in ESBC uboot
487 * client hdr. This function calculates the hash of key which is obtained
488 * through offset present in ESBC uboot client header.
490 static int calc_img_key_hash(struct fsl_secboot_img_priv *img)
492 struct hash_algo *algo;
496 const char *algo_name = "sha256";
498 /* Calculate hash of the esbc key */
499 ret = hash_progressive_lookup_algo(algo_name, &algo);
503 ret = algo->hash_init(algo, &ctx);
506 /* Update hash for ESBC key */
507 #ifdef CONFIG_KEY_REVOCATION
508 if (check_srk(img)) {
509 ret = algo->hash_update(algo, ctx,
510 (u8 *)(uintptr_t)(img->ehdrloc + img->hdr.srk_tbl_off),
511 img->hdr.len_kr.num_srk * sizeof(struct srk_table), 1);
516 ret = algo->hash_update(algo, ctx,
517 img->img_key, img->key_len, 1);
520 /* Copy hash at destination buffer */
521 ret = algo->hash_finish(algo, ctx, hash_val, algo->digest_size);
526 for (i = 0; i < SHA256_BYTES; i++)
527 img->img_key_hash[i] = hash_val[i];
533 * Calculate hash of ESBC hdr and ESBC. This function calculates the
534 * single hash of ESBC header and ESBC image. If SG flag is on, all
535 * SG entries are also hashed alongwith the complete SG table.
537 static int calc_esbchdr_esbc_hash(struct fsl_secboot_img_priv *img)
539 struct hash_algo *algo;
543 const char *algo_name = "sha256";
545 /* Calculate the hash of the ESBC */
546 ret = hash_progressive_lookup_algo(algo_name, &algo);
550 ret = algo->hash_init(algo, &ctx);
551 /* Copy hash at destination buffer */
555 /* Update hash for CSF Header */
556 ret = algo->hash_update(algo, ctx,
557 (u8 *)&img->hdr, sizeof(struct fsl_secboot_img_hdr), 0);
561 /* Update the hash with that of srk table if srk flag is 1
562 * If IE Table is selected, key is not added in the hash
563 * If neither srk table nor IE key table available, add key
564 * from header in the hash calculation
566 #ifdef CONFIG_KEY_REVOCATION
567 if (check_srk(img)) {
568 ret = algo->hash_update(algo, ctx,
569 (u8 *)(uintptr_t)(img->ehdrloc + img->hdr.srk_tbl_off),
570 img->hdr.len_kr.num_srk * sizeof(struct srk_table), 0);
574 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
575 if (!key_hash && check_ie(img))
578 #ifndef CONFIG_ESBC_HDR_LS
579 /* No single key support in LS ESBC header */
581 ret = algo->hash_update(algo, ctx,
582 img->img_key, img->hdr.key_len, 0);
590 return ERROR_KEY_TABLE_NOT_FOUND;
592 /* Update hash for actual Image */
593 ret = algo->hash_update(algo, ctx,
594 (u8 *)(*(img->img_addr_ptr)), img->img_size, 1);
598 /* Copy hash at destination buffer */
599 ret = algo->hash_finish(algo, ctx, hash_val, algo->digest_size);
608 * Construct encoded hash EM' wrt PKCSv1.5. This function calculates the
609 * pointers for padding, DER value and hash. And finally, constructs EM'
610 * which includes hash of complete CSF header and ESBC image. If SG flag
611 * is on, hash of SG table and entries is also included.
613 static void construct_img_encoded_hash_second(struct fsl_secboot_img_priv *img)
616 * RSA PKCSv1.5 encoding format for encoded message is below
617 * EM = 0x0 || 0x1 || PS || 0x0 || DER || Hash
618 * PS is Padding String
619 * DER is DER value for SHA-256
620 * Hash is SHA-256 hash
621 * *********************************************************
622 * representative points to first byte of EM initially and is
624 * representative is incremented by 1 and second byte is filled
626 * padding points to third byte of EM
627 * digest points to full length of EM - 32 bytes
628 * hash_id (DER value) points to 19 bytes before pDigest
629 * separator is one byte which separates padding and DER
634 u8 *padding, *digest;
635 u8 *hash_id, *separator;
638 len = (get_key_len(img) / 2) - 1;
639 representative = img->img_encoded_hash_second;
640 representative[0] = 0;
641 representative[1] = 1; /* block type 1 */
643 padding = &representative[2];
644 digest = &representative[1] + len - 32;
645 hash_id = digest - sizeof(hash_identifier);
646 separator = hash_id - 1;
648 /* fill padding area pointed by padding with 0xff */
649 memset(padding, 0xff, separator - padding);
651 /* fill byte pointed by separator */
654 /* fill SHA-256 DER value pointed by HashId */
655 memcpy(hash_id, hash_identifier, sizeof(hash_identifier));
657 /* fill hash pointed by Digest */
658 for (i = 0; i < SHA256_BYTES; i++)
659 digest[i] = hash_val[i];
663 * Reads and validates the ESBC client header.
664 * This function reads key and signature from the ESBC client header.
665 * If Scatter/Gather flag is on, lengths and offsets of images
666 * present as SG entries are also read. This function also checks
667 * whether the header is valid or not.
669 static int read_validate_esbc_client_header(struct fsl_secboot_img_priv *img)
671 struct fsl_secboot_img_hdr *hdr = &img->hdr;
672 void *esbc = (u8 *)(uintptr_t)img->ehdrloc;
678 /* check barker code */
679 if (memcmp(hdr->barker, barker_code, ESBC_BARKER_LEN))
680 return ERROR_ESBC_CLIENT_HEADER_BARKER;
682 /* If Image Address is not passed as argument to function,
683 * then Address and Size must be read from the Header.
685 if (*(img->img_addr_ptr) == 0) {
686 #ifdef CONFIG_ESBC_ADDR_64BIT
687 *(img->img_addr_ptr) = hdr->pimg64;
689 *(img->img_addr_ptr) = hdr->pimg;
694 return ERROR_ESBC_CLIENT_HEADER_IMG_SIZE;
696 img->img_size = hdr->img_size;
699 #ifdef CONFIG_KEY_REVOCATION
700 if (check_srk(img)) {
701 ret = read_validate_srk_tbl(img);
708 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
709 if (!key_found && check_ie(img)) {
710 ret = read_validate_ie_tbl(img);
716 #ifndef CONFIG_ESBC_HDR_LS
717 /* Single Key Feature not available in LS ESBC Header */
718 if (key_found == 0) {
719 ret = read_validate_single_key(img);
726 return ERROR_KEY_TABLE_NOT_FOUND;
729 if (get_key_len(img) == 2 * hdr->sign_len) {
730 /* check signature length */
731 if (!((hdr->sign_len == KEY_SIZE_BYTES / 4) ||
732 (hdr->sign_len == KEY_SIZE_BYTES / 2) ||
733 (hdr->sign_len == KEY_SIZE_BYTES)))
734 return ERROR_ESBC_CLIENT_HEADER_SIG_LEN;
736 return ERROR_ESBC_CLIENT_HEADER_KEY_LEN_NOT_TWICE_SIG_LEN;
739 memcpy(&img->img_sign, esbc + hdr->psign, hdr->sign_len);
740 /* No SG support in LS-CH3 */
741 #ifndef CONFIG_ESBC_HDR_LS
744 return ERROR_ESBC_CLIENT_HEADER_SG;
747 /* modulus most significant bit should be set */
748 k = (u8 *)&img->img_key;
750 if ((k[0] & 0x80) == 0)
751 return ERROR_ESBC_CLIENT_HEADER_KEY_MOD_1;
753 /* modulus value should be odd */
754 if ((k[get_key_len(img) / 2 - 1] & 0x1) == 0)
755 return ERROR_ESBC_CLIENT_HEADER_KEY_MOD_2;
757 /* Check signature value < modulus value */
758 s = (u8 *)&img->img_sign;
760 if (!(memcmp(s, k, hdr->sign_len) < 0))
761 return ERROR_ESBC_CLIENT_HEADER_SIG_KEY_MOD;
763 return ESBC_VALID_HDR;
766 static inline int str2longbe(const char *p, ulong *num)
774 tmp = hextoul(p, &endptr);
775 if (sizeof(ulong) == 4)
776 *num = cpu_to_be32(tmp);
778 *num = cpu_to_be64(tmp);
781 return *p != '\0' && *endptr == '\0';
783 /* Function to calculate the ESBC Image Hash
784 * and hash from Digital signature.
785 * The Two hash's are compared to yield the
786 * result of signature validation.
788 static int calculate_cmp_img_sig(struct fsl_secboot_img_priv *img)
792 struct key_prop prop;
793 #if !defined(USE_HOSTCC)
794 struct udevice *mod_exp_dev;
796 ret = calc_esbchdr_esbc_hash(img);
800 /* Construct encoded hash EM' wrt PKCSv1.5 */
801 construct_img_encoded_hash_second(img);
803 /* Fill prop structure for public key */
804 memset(&prop, 0, sizeof(struct key_prop));
805 key_len = get_key_len(img) / 2;
806 prop.modulus = img->img_key;
807 prop.public_exponent = img->img_key + key_len;
808 prop.num_bits = key_len * 8;
809 prop.exp_len = key_len;
811 #if defined(CONFIG_SPL_BUILD)
812 ret = device_bind_driver(NULL, "fsl_rsa_mod_exp", "fsl_rsa_mod_exp", NULL);
814 printf("Couldn't bind fsl_rsa_mod_exp driver (%d)\n", ret);
818 ret = uclass_get_device(UCLASS_MOD_EXP, 0, &mod_exp_dev);
820 printf("RSA: Can't find Modular Exp implementation\n");
824 ret = rsa_mod_exp(mod_exp_dev, img->img_sign, img->hdr.sign_len,
825 &prop, img->img_encoded_hash);
830 * compare the encoded messages EM' and EM wrt RSA PKCSv1.5
831 * memcmp returns zero on success
832 * memcmp returns non-zero on failure
834 ret = memcmp(&img->img_encoded_hash_second, &img->img_encoded_hash,
838 return ERROR_ESBC_CLIENT_HASH_COMPARE_EM;
842 /* Function to initialize img priv and global data structure
844 static int secboot_init(struct fsl_secboot_img_priv **img_ptr)
846 *img_ptr = malloc(sizeof(struct fsl_secboot_img_priv));
848 struct fsl_secboot_img_priv *img = *img_ptr;
852 memset(img, 0, sizeof(struct fsl_secboot_img_priv));
854 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
856 img->ie_addr = glb.ie_addr;
862 /* haddr - Address of the header of image to be validated.
863 * arg_hash_str - Option hash string. If provided, this
864 * overrides the key hash in the SFP fuses.
865 * img_addr_ptr - Optional pointer to address of image to be validated.
866 * If non zero addr, this overrides the addr of image in header,
867 * otherwise updated to image addr in header.
868 * Acts as both input and output of function.
869 * This pointer shouldn't be NULL.
871 int fsl_secboot_validate(uintptr_t haddr, char *arg_hash_str,
872 uintptr_t *img_addr_ptr)
874 struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
875 ulong hash[SHA256_BYTES/sizeof(ulong)];
876 char hash_str[NUM_HEX_CHARS + 1];
877 struct fsl_secboot_img_priv *img;
878 struct fsl_secboot_img_hdr *hdr;
880 int ret, i, hash_cmd = 0;
883 if (strlen(arg_hash_str) != 0) {
884 const char *cp = arg_hash_str;
887 if (*cp == '0' && *(cp + 1) == 'x')
890 /* The input string expected is in hex, where
891 * each 4 bits would be represented by a hex
892 * sha256 hash is 256 bits long, which would mean
893 * num of characters = 256 / 4
895 if (strlen(cp) != SHA256_NIBBLES) {
896 printf("%s is not a 256 bits hex string as expected\n",
901 for (i = 0; i < sizeof(hash)/sizeof(ulong); i++) {
902 strncpy(hash_str, cp + (i * NUM_HEX_CHARS),
904 hash_str[NUM_HEX_CHARS] = '\0';
905 if (!str2longbe(hash_str, &hash[i])) {
906 printf("%s is not a 256 bits hex string ",
915 ret = secboot_init(&img);
919 /* Update the information in Private Struct */
921 img->ehdrloc = haddr;
922 img->img_addr_ptr = img_addr_ptr;
923 esbc = (u8 *)img->ehdrloc;
925 memcpy(hdr, esbc, sizeof(struct fsl_secboot_img_hdr));
927 /* read and validate esbc header */
928 ret = read_validate_esbc_client_header(img);
930 if (ret != ESBC_VALID_HDR) {
931 fsl_secboot_handle_error(ret);
935 /* SRKH present in SFP */
936 for (i = 0; i < NUM_SRKH_REGS; i++)
937 srk_hash[i] = srk_in32(&sfp_regs->srk_hash[i]);
940 * Calculate hash of key obtained via offset present in
941 * ESBC uboot client hdr
943 ret = calc_img_key_hash(img);
945 fsl_secblk_handle_error(ret);
949 /* Compare hash obtained above with SRK hash present in SFP */
951 ret = memcmp(&hash, &img->img_key_hash, SHA256_BYTES);
953 ret = memcmp(srk_hash, img->img_key_hash, SHA256_BYTES);
955 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
956 if (!hash_cmd && check_ie(img))
961 fsl_secboot_handle_error(ERROR_ESBC_CLIENT_HASH_COMPARE_KEY);
965 ret = calculate_cmp_img_sig(img);
967 fsl_secboot_handle_error(ret);
972 /* Free Img as it was malloc'ed*/