2 * Copyright 2015 Freescale Semiconductor, Inc.
4 * SPDX-License-Identifier: GPL-2.0+
8 #include <fsl_validate.h>
9 #include <fsl_secboot_err.h>
14 #include <dm/uclass.h>
15 #include <u-boot/rsa-mod-exp.h>
17 #include <fsl_secboot_err.h>
19 #include <asm/arch/immap_ls102xa.h>
22 #define SHA256_BITS 256
23 #define SHA256_BYTES (256/8)
24 #define SHA256_NIBBLES (256/4)
25 #define NUM_HEX_CHARS (sizeof(ulong) * 2)
27 #define CHECK_KEY_LEN(key_len) (((key_len) == 2 * KEY_SIZE_BYTES / 4) || \
28 ((key_len) == 2 * KEY_SIZE_BYTES / 2) || \
29 ((key_len) == 2 * KEY_SIZE_BYTES))
31 /* This array contains DER value for SHA-256 */
32 static const u8 hash_identifier[] = { 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60,
33 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00,
37 static u8 hash_val[SHA256_BYTES];
39 #ifdef CONFIG_ESBC_HDR_LS
40 /* New Barker Code for LS ESBC Header */
41 static const u8 barker_code[ESBC_BARKER_LEN] = { 0x12, 0x19, 0x20, 0x01 };
43 static const u8 barker_code[ESBC_BARKER_LEN] = { 0x68, 0x39, 0x27, 0x81 };
46 void branch_to_self(void) __attribute__ ((noreturn));
49 * This function will put core in infinite loop.
50 * This will be called when the ESBC can not proceed further due
51 * to some unknown errors.
53 void branch_to_self(void)
55 printf("Core is in infinite loop due to errors.\n");
60 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
61 static u32 check_ie(struct fsl_secboot_img_priv *img)
69 /* This function returns the CSF Header Address of uboot
70 * For MPC85xx based platforms, the LAW mapping for NOR
71 * flash changes in uboot code. Hence the offset needs
72 * to be calculated and added to the new NOR flash base
75 #if defined(CONFIG_MPC85xx)
76 int get_csf_base_addr(u32 *csf_addr, u32 *flash_base_addr)
78 struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
79 u32 csf_hdr_addr = in_be32(&gur->scratchrw[0]);
80 u32 csf_flash_offset = csf_hdr_addr & ~(CONFIG_SYS_PBI_FLASH_BASE);
85 for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
86 flash_addr = flash_info[i].start[0];
87 addr = flash_info[i].start[0] + csf_flash_offset;
88 if (memcmp((u8 *)addr, barker_code, ESBC_BARKER_LEN) == 0) {
89 debug("Barker found on addr %x\n", addr);
99 *flash_base_addr = flash_addr;
104 /* For platforms like LS1020, correct flash address is present in
105 * the header. So the function reqturns flash base address as 0
107 int get_csf_base_addr(u32 *csf_addr, u32 *flash_base_addr)
109 struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
110 u32 csf_hdr_addr = in_be32(&gur->scratchrw[0]);
112 if (memcmp((u8 *)(uintptr_t)csf_hdr_addr,
113 barker_code, ESBC_BARKER_LEN))
116 *csf_addr = csf_hdr_addr;
117 *flash_base_addr = 0;
122 static int get_ie_info_addr(u32 *ie_addr)
124 struct fsl_secboot_img_hdr *hdr;
125 struct fsl_secboot_sg_table *sg_tbl;
126 u32 flash_base_addr, csf_addr;
128 if (get_csf_base_addr(&csf_addr, &flash_base_addr))
131 hdr = (struct fsl_secboot_img_hdr *)(uintptr_t)csf_addr;
133 /* For SoC's with Trust Architecture v1 with corenet bus
134 * the sg table field in CSF header has absolute address
135 * for sg table in memory. In other Trust Architecture,
136 * this field specifies the offset of sg table from the
137 * base address of CSF Header
139 #if defined(CONFIG_FSL_TRUST_ARCH_v1) && defined(CONFIG_FSL_CORENET)
140 sg_tbl = (struct fsl_secboot_sg_table *)
141 (((u32)hdr->psgtable & ~(CONFIG_SYS_PBI_FLASH_BASE)) +
144 sg_tbl = (struct fsl_secboot_sg_table *)(uintptr_t)(csf_addr +
148 /* IE Key Table is the first entry in the SG Table */
149 #if defined(CONFIG_MPC85xx)
150 *ie_addr = (sg_tbl->src_addr & ~(CONFIG_SYS_PBI_FLASH_BASE)) +
153 *ie_addr = sg_tbl->src_addr;
156 debug("IE Table address is %x\n", *ie_addr);
162 #ifdef CONFIG_KEY_REVOCATION
163 /* This function checks srk_table_flag in header and set/reset srk_flag.*/
164 static u32 check_srk(struct fsl_secboot_img_priv *img)
166 #ifdef CONFIG_ESBC_HDR_LS
167 /* In LS, No SRK Flag as SRK is always present*/
170 if (img->hdr.len_kr.srk_table_flag & SRK_FLAG)
177 /* This function returns ospr's key_revoc values.*/
178 static u32 get_key_revoc(void)
180 struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
181 return (sfp_in32(&sfp_regs->ospr) & OSPR_KEY_REVOC_MASK) >>
182 OSPR_KEY_REVOC_SHIFT;
185 /* This function checks if selected key is revoked or not.*/
186 static u32 is_key_revoked(u32 keynum, u32 rev_flag)
188 if (keynum == UNREVOCABLE_KEY)
191 if ((u32)(1 << (ALIGN_REVOC_KEY - keynum)) & rev_flag)
197 /* It read validates srk_table key lengths.*/
198 static u32 read_validate_srk_tbl(struct fsl_secboot_img_priv *img)
201 u32 ret, key_num, key_revoc_flag, size;
202 struct fsl_secboot_img_hdr *hdr = &img->hdr;
203 void *esbc = (u8 *)(uintptr_t)img->ehdrloc;
205 if ((hdr->len_kr.num_srk == 0) ||
206 (hdr->len_kr.num_srk > MAX_KEY_ENTRIES))
207 return ERROR_ESBC_CLIENT_HEADER_INVALID_SRK_NUM_ENTRY;
209 key_num = hdr->len_kr.srk_sel;
210 if (key_num == 0 || key_num > hdr->len_kr.num_srk)
211 return ERROR_ESBC_CLIENT_HEADER_INVALID_KEY_NUM;
213 /* Get revoc key from sfp */
214 key_revoc_flag = get_key_revoc();
215 ret = is_key_revoked(key_num, key_revoc_flag);
217 return ERROR_ESBC_CLIENT_HEADER_KEY_REVOKED;
219 size = hdr->len_kr.num_srk * sizeof(struct srk_table);
221 memcpy(&img->srk_tbl, esbc + hdr->srk_tbl_off, size);
223 for (i = 0; i < hdr->len_kr.num_srk; i++) {
224 if (!CHECK_KEY_LEN(img->srk_tbl[i].key_len))
225 return ERROR_ESBC_CLIENT_HEADER_INV_SRK_ENTRY_KEYLEN;
228 img->key_len = img->srk_tbl[key_num - 1].key_len;
230 memcpy(&img->img_key, &(img->srk_tbl[key_num - 1].pkey),
237 #ifndef CONFIG_ESBC_HDR_LS
238 static u32 read_validate_single_key(struct fsl_secboot_img_priv *img)
240 struct fsl_secboot_img_hdr *hdr = &img->hdr;
241 void *esbc = (u8 *)(uintptr_t)img->ehdrloc;
243 /* check key length */
244 if (!CHECK_KEY_LEN(hdr->key_len))
245 return ERROR_ESBC_CLIENT_HEADER_KEY_LEN;
247 memcpy(&img->img_key, esbc + hdr->pkey, hdr->key_len);
249 img->key_len = hdr->key_len;
253 #endif /* CONFIG_ESBC_HDR_LS */
255 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
256 static u32 read_validate_ie_tbl(struct fsl_secboot_img_priv *img)
258 struct fsl_secboot_img_hdr *hdr = &img->hdr;
259 u32 ie_key_len, ie_revoc_flag, ie_num;
260 struct ie_key_info *ie_info;
262 if (get_ie_info_addr(&img->ie_addr))
263 return ERROR_IE_TABLE_NOT_FOUND;
264 ie_info = (struct ie_key_info *)(uintptr_t)img->ie_addr;
265 if (ie_info->num_keys == 0 || ie_info->num_keys > 32)
266 return ERROR_ESBC_CLIENT_HEADER_INVALID_IE_NUM_ENTRY;
268 ie_num = hdr->ie_key_sel;
269 if (ie_num == 0 || ie_num > ie_info->num_keys)
270 return ERROR_ESBC_CLIENT_HEADER_INVALID_IE_KEY_NUM;
272 ie_revoc_flag = ie_info->key_revok;
273 if ((u32)(1 << (ie_num - 1)) & ie_revoc_flag)
274 return ERROR_ESBC_CLIENT_HEADER_IE_KEY_REVOKED;
276 ie_key_len = ie_info->ie_key_tbl[ie_num - 1].key_len;
278 if (!CHECK_KEY_LEN(ie_key_len))
279 return ERROR_ESBC_CLIENT_HEADER_INV_IE_ENTRY_KEYLEN;
281 memcpy(&img->img_key, &(ie_info->ie_key_tbl[ie_num - 1].pkey),
284 img->key_len = ie_key_len;
290 /* This function return length of public key.*/
291 static inline u32 get_key_len(struct fsl_secboot_img_priv *img)
297 * Handles the ESBC uboot client header verification failure.
298 * This function handles all the errors which might occur in the
299 * parsing and checking of ESBC uboot client header. It will also
300 * set the error bits in the SEC_MON.
302 static void fsl_secboot_header_verification_failure(void)
304 struct ccsr_sec_mon_regs *sec_mon_regs = (void *)
305 (CONFIG_SYS_SEC_MON_ADDR);
306 struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
307 u32 sts = sec_mon_in32(&sec_mon_regs->hp_stat);
309 /* 29th bit of OSPR is ITS */
310 u32 its = sfp_in32(&sfp_regs->ospr) >> 2;
313 * Read the SEC_MON status register
316 sts = sec_mon_in32(&sec_mon_regs->hp_stat);
317 if ((sts & HPSR_SSM_ST_MASK) == HPSR_SSM_ST_TRUST) {
319 change_sec_mon_state(HPSR_SSM_ST_TRUST,
320 HPSR_SSM_ST_SOFT_FAIL);
322 change_sec_mon_state(HPSR_SSM_ST_TRUST,
323 HPSR_SSM_ST_NON_SECURE);
326 printf("Generating reset request\n");
327 do_reset(NULL, 0, 0, NULL);
328 /* If reset doesn't coocur, halt execution */
329 do_esbc_halt(NULL, 0, 0, NULL);
333 * Handles the ESBC uboot client image verification failure.
334 * This function handles all the errors which might occur in the
335 * public key hash comparison and signature verification of
336 * ESBC uboot client image. It will also
337 * set the error bits in the SEC_MON.
339 static void fsl_secboot_image_verification_failure(void)
341 struct ccsr_sec_mon_regs *sec_mon_regs = (void *)
342 (CONFIG_SYS_SEC_MON_ADDR);
343 struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
344 u32 sts = sec_mon_in32(&sec_mon_regs->hp_stat);
346 u32 its = (sfp_in32(&sfp_regs->ospr) & ITS_MASK) >> ITS_BIT;
349 * Read the SEC_MON status register
352 sts = sec_mon_in32(&sec_mon_regs->hp_stat);
353 if ((sts & HPSR_SSM_ST_MASK) == HPSR_SSM_ST_TRUST) {
355 change_sec_mon_state(HPSR_SSM_ST_TRUST,
356 HPSR_SSM_ST_SOFT_FAIL);
358 printf("Generating reset request\n");
359 do_reset(NULL, 0, 0, NULL);
360 /* If reset doesn't coocur, halt execution */
361 do_esbc_halt(NULL, 0, 0, NULL);
364 change_sec_mon_state(HPSR_SSM_ST_TRUST,
365 HPSR_SSM_ST_NON_SECURE);
370 static void fsl_secboot_bootscript_parse_failure(void)
372 fsl_secboot_header_verification_failure();
376 * Handles the errors in esbc boot.
377 * This function handles all the errors which might occur in the
378 * esbc boot phase. It will call the appropriate api to log the
379 * errors and set the error bits in the SEC_MON.
381 void fsl_secboot_handle_error(int error)
383 const struct fsl_secboot_errcode *e;
385 for (e = fsl_secboot_errcodes; e->errcode != ERROR_ESBC_CLIENT_MAX;
387 if (e->errcode == error)
388 printf("ERROR :: %x :: %s\n", error, e->name);
391 /* If Boot Mode is secure, transition the SNVS state and issue
392 * reset based on type of failure and ITS setting.
393 * If Boot mode is non-secure, return from this function.
395 if (fsl_check_boot_mode_secure() == 0)
399 case ERROR_ESBC_CLIENT_HEADER_BARKER:
400 case ERROR_ESBC_CLIENT_HEADER_IMG_SIZE:
401 case ERROR_ESBC_CLIENT_HEADER_KEY_LEN:
402 case ERROR_ESBC_CLIENT_HEADER_SIG_LEN:
403 case ERROR_ESBC_CLIENT_HEADER_KEY_LEN_NOT_TWICE_SIG_LEN:
404 case ERROR_ESBC_CLIENT_HEADER_KEY_MOD_1:
405 case ERROR_ESBC_CLIENT_HEADER_KEY_MOD_2:
406 case ERROR_ESBC_CLIENT_HEADER_SIG_KEY_MOD:
407 case ERROR_ESBC_CLIENT_HEADER_SG_ESBC_EP:
408 case ERROR_ESBC_CLIENT_HEADER_SG_ENTIRES_BAD:
409 case ERROR_KEY_TABLE_NOT_FOUND:
410 #ifdef CONFIG_KEY_REVOCATION
411 case ERROR_ESBC_CLIENT_HEADER_KEY_REVOKED:
412 case ERROR_ESBC_CLIENT_HEADER_INVALID_SRK_NUM_ENTRY:
413 case ERROR_ESBC_CLIENT_HEADER_INVALID_KEY_NUM:
414 case ERROR_ESBC_CLIENT_HEADER_INV_SRK_ENTRY_KEYLEN:
416 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
418 case ERROR_ESBC_CLIENT_HEADER_IE_KEY_REVOKED:
419 case ERROR_ESBC_CLIENT_HEADER_INVALID_IE_NUM_ENTRY:
420 case ERROR_ESBC_CLIENT_HEADER_INVALID_IE_KEY_NUM:
421 case ERROR_ESBC_CLIENT_HEADER_INV_IE_ENTRY_KEYLEN:
422 case ERROR_IE_TABLE_NOT_FOUND:
424 fsl_secboot_header_verification_failure();
426 case ERROR_ESBC_SEC_RESET:
427 case ERROR_ESBC_SEC_DEQ:
428 case ERROR_ESBC_SEC_ENQ:
429 case ERROR_ESBC_SEC_DEQ_TO:
430 case ERROR_ESBC_SEC_JOBQ_STATUS:
431 case ERROR_ESBC_CLIENT_HASH_COMPARE_KEY:
432 case ERROR_ESBC_CLIENT_HASH_COMPARE_EM:
433 fsl_secboot_image_verification_failure();
435 case ERROR_ESBC_MISSING_BOOTM:
436 fsl_secboot_bootscript_parse_failure();
438 case ERROR_ESBC_WRONG_CMD:
445 static void fsl_secblk_handle_error(int error)
448 case ERROR_ESBC_SEC_ENQ:
449 fsl_secboot_handle_error(ERROR_ESBC_SEC_ENQ);
451 case ERROR_ESBC_SEC_DEQ:
452 fsl_secboot_handle_error(ERROR_ESBC_SEC_DEQ);
454 case ERROR_ESBC_SEC_DEQ_TO:
455 fsl_secboot_handle_error(ERROR_ESBC_SEC_DEQ_TO);
458 printf("Job Queue Output status %x\n", error);
459 fsl_secboot_handle_error(ERROR_ESBC_SEC_JOBQ_STATUS);
465 * Calculate hash of key obtained via offset present in ESBC uboot
466 * client hdr. This function calculates the hash of key which is obtained
467 * through offset present in ESBC uboot client header.
469 static int calc_img_key_hash(struct fsl_secboot_img_priv *img)
471 struct hash_algo *algo;
475 const char *algo_name = "sha256";
477 /* Calculate hash of the esbc key */
478 ret = hash_progressive_lookup_algo(algo_name, &algo);
482 ret = algo->hash_init(algo, &ctx);
486 /* Update hash for ESBC key */
487 #ifdef CONFIG_KEY_REVOCATION
488 if (check_srk(img)) {
489 ret = algo->hash_update(algo, ctx,
490 (u8 *)(uintptr_t)(img->ehdrloc + img->hdr.srk_tbl_off),
491 img->hdr.len_kr.num_srk * sizeof(struct srk_table), 1);
496 ret = algo->hash_update(algo, ctx,
497 img->img_key, img->key_len, 1);
501 /* Copy hash at destination buffer */
502 ret = algo->hash_finish(algo, ctx, hash_val, algo->digest_size);
506 for (i = 0; i < SHA256_BYTES; i++)
507 img->img_key_hash[i] = hash_val[i];
513 * Calculate hash of ESBC hdr and ESBC. This function calculates the
514 * single hash of ESBC header and ESBC image. If SG flag is on, all
515 * SG entries are also hashed alongwith the complete SG table.
517 static int calc_esbchdr_esbc_hash(struct fsl_secboot_img_priv *img)
519 struct hash_algo *algo;
523 const char *algo_name = "sha256";
525 /* Calculate the hash of the ESBC */
526 ret = hash_progressive_lookup_algo(algo_name, &algo);
530 ret = algo->hash_init(algo, &ctx);
531 /* Copy hash at destination buffer */
535 /* Update hash for CSF Header */
536 ret = algo->hash_update(algo, ctx,
537 (u8 *)&img->hdr, sizeof(struct fsl_secboot_img_hdr), 0);
541 /* Update the hash with that of srk table if srk flag is 1
542 * If IE Table is selected, key is not added in the hash
543 * If neither srk table nor IE key table available, add key
544 * from header in the hash calculation
546 #ifdef CONFIG_KEY_REVOCATION
547 if (check_srk(img)) {
548 ret = algo->hash_update(algo, ctx,
549 (u8 *)(uintptr_t)(img->ehdrloc + img->hdr.srk_tbl_off),
550 img->hdr.len_kr.num_srk * sizeof(struct srk_table), 0);
554 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
555 if (!key_hash && check_ie(img))
558 #ifndef CONFIG_ESBC_HDR_LS
559 /* No single key support in LS ESBC header */
561 ret = algo->hash_update(algo, ctx,
562 img->img_key, img->hdr.key_len, 0);
569 return ERROR_KEY_TABLE_NOT_FOUND;
571 /* Update hash for actual Image */
572 ret = algo->hash_update(algo, ctx,
573 (u8 *)(*(img->img_addr_ptr)), img->img_size, 1);
577 /* Copy hash at destination buffer */
578 ret = algo->hash_finish(algo, ctx, hash_val, algo->digest_size);
586 * Construct encoded hash EM' wrt PKCSv1.5. This function calculates the
587 * pointers for padding, DER value and hash. And finally, constructs EM'
588 * which includes hash of complete CSF header and ESBC image. If SG flag
589 * is on, hash of SG table and entries is also included.
591 static void construct_img_encoded_hash_second(struct fsl_secboot_img_priv *img)
594 * RSA PKCSv1.5 encoding format for encoded message is below
595 * EM = 0x0 || 0x1 || PS || 0x0 || DER || Hash
596 * PS is Padding String
597 * DER is DER value for SHA-256
598 * Hash is SHA-256 hash
599 * *********************************************************
600 * representative points to first byte of EM initially and is
602 * representative is incremented by 1 and second byte is filled
604 * padding points to third byte of EM
605 * digest points to full length of EM - 32 bytes
606 * hash_id (DER value) points to 19 bytes before pDigest
607 * separator is one byte which separates padding and DER
612 u8 *padding, *digest;
613 u8 *hash_id, *separator;
616 len = (get_key_len(img) / 2) - 1;
617 representative = img->img_encoded_hash_second;
618 representative[0] = 0;
619 representative[1] = 1; /* block type 1 */
621 padding = &representative[2];
622 digest = &representative[1] + len - 32;
623 hash_id = digest - sizeof(hash_identifier);
624 separator = hash_id - 1;
626 /* fill padding area pointed by padding with 0xff */
627 memset(padding, 0xff, separator - padding);
629 /* fill byte pointed by separator */
632 /* fill SHA-256 DER value pointed by HashId */
633 memcpy(hash_id, hash_identifier, sizeof(hash_identifier));
635 /* fill hash pointed by Digest */
636 for (i = 0; i < SHA256_BYTES; i++)
637 digest[i] = hash_val[i];
641 * Reads and validates the ESBC client header.
642 * This function reads key and signature from the ESBC client header.
643 * If Scatter/Gather flag is on, lengths and offsets of images
644 * present as SG entries are also read. This function also checks
645 * whether the header is valid or not.
647 static int read_validate_esbc_client_header(struct fsl_secboot_img_priv *img)
649 struct fsl_secboot_img_hdr *hdr = &img->hdr;
650 void *esbc = (u8 *)(uintptr_t)img->ehdrloc;
656 /* check barker code */
657 if (memcmp(hdr->barker, barker_code, ESBC_BARKER_LEN))
658 return ERROR_ESBC_CLIENT_HEADER_BARKER;
660 /* If Image Address is not passed as argument to function,
661 * then Address and Size must be read from the Header.
663 if (*(img->img_addr_ptr) == 0) {
664 #ifdef CONFIG_ESBC_ADDR_64BIT
665 *(img->img_addr_ptr) = hdr->pimg64;
667 *(img->img_addr_ptr) = hdr->pimg;
672 return ERROR_ESBC_CLIENT_HEADER_IMG_SIZE;
674 img->img_size = hdr->img_size;
677 #ifdef CONFIG_KEY_REVOCATION
678 if (check_srk(img)) {
679 ret = read_validate_srk_tbl(img);
686 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
687 if (!key_found && check_ie(img)) {
688 ret = read_validate_ie_tbl(img);
694 #ifndef CONFIG_ESBC_HDR_LS
695 /* Single Key Feature not available in LS ESBC Header */
696 if (key_found == 0) {
697 ret = read_validate_single_key(img);
704 return ERROR_KEY_TABLE_NOT_FOUND;
707 if (get_key_len(img) == 2 * hdr->sign_len) {
708 /* check signature length */
709 if (!((hdr->sign_len == KEY_SIZE_BYTES / 4) ||
710 (hdr->sign_len == KEY_SIZE_BYTES / 2) ||
711 (hdr->sign_len == KEY_SIZE_BYTES)))
712 return ERROR_ESBC_CLIENT_HEADER_SIG_LEN;
714 return ERROR_ESBC_CLIENT_HEADER_KEY_LEN_NOT_TWICE_SIG_LEN;
717 memcpy(&img->img_sign, esbc + hdr->psign, hdr->sign_len);
718 /* No SG support in LS-CH3 */
719 #ifndef CONFIG_ESBC_HDR_LS
722 return ERROR_ESBC_CLIENT_HEADER_SG;
725 /* modulus most significant bit should be set */
726 k = (u8 *)&img->img_key;
728 if ((k[0] & 0x80) == 0)
729 return ERROR_ESBC_CLIENT_HEADER_KEY_MOD_1;
731 /* modulus value should be odd */
732 if ((k[get_key_len(img) / 2 - 1] & 0x1) == 0)
733 return ERROR_ESBC_CLIENT_HEADER_KEY_MOD_2;
735 /* Check signature value < modulus value */
736 s = (u8 *)&img->img_sign;
738 if (!(memcmp(s, k, hdr->sign_len) < 0))
739 return ERROR_ESBC_CLIENT_HEADER_SIG_KEY_MOD;
741 return ESBC_VALID_HDR;
744 static inline int str2longbe(const char *p, ulong *num)
752 tmp = simple_strtoul(p, &endptr, 16);
753 if (sizeof(ulong) == 4)
754 *num = cpu_to_be32(tmp);
756 *num = cpu_to_be64(tmp);
759 return *p != '\0' && *endptr == '\0';
761 /* Function to calculate the ESBC Image Hash
762 * and hash from Digital signature.
763 * The Two hash's are compared to yield the
764 * result of signature validation.
766 static int calculate_cmp_img_sig(struct fsl_secboot_img_priv *img)
770 struct key_prop prop;
771 #if !defined(USE_HOSTCC)
772 struct udevice *mod_exp_dev;
774 ret = calc_esbchdr_esbc_hash(img);
778 /* Construct encoded hash EM' wrt PKCSv1.5 */
779 construct_img_encoded_hash_second(img);
781 /* Fill prop structure for public key */
782 memset(&prop, 0, sizeof(struct key_prop));
783 key_len = get_key_len(img) / 2;
784 prop.modulus = img->img_key;
785 prop.public_exponent = img->img_key + key_len;
786 prop.num_bits = key_len * 8;
787 prop.exp_len = key_len;
789 ret = uclass_get_device(UCLASS_MOD_EXP, 0, &mod_exp_dev);
791 printf("RSA: Can't find Modular Exp implementation\n");
795 ret = rsa_mod_exp(mod_exp_dev, img->img_sign, img->hdr.sign_len,
796 &prop, img->img_encoded_hash);
801 * compare the encoded messages EM' and EM wrt RSA PKCSv1.5
802 * memcmp returns zero on success
803 * memcmp returns non-zero on failure
805 ret = memcmp(&img->img_encoded_hash_second, &img->img_encoded_hash,
809 return ERROR_ESBC_CLIENT_HASH_COMPARE_EM;
813 /* haddr - Address of the header of image to be validated.
814 * arg_hash_str - Option hash string. If provided, this
815 * overrides the key hash in the SFP fuses.
816 * img_addr_ptr - Optional pointer to address of image to be validated.
817 * If non zero addr, this overrides the addr of image in header,
818 * otherwise updated to image addr in header.
819 * Acts as both input and output of function.
820 * This pointer shouldn't be NULL.
822 int fsl_secboot_validate(uintptr_t haddr, char *arg_hash_str,
823 uintptr_t *img_addr_ptr)
825 struct ccsr_sfp_regs *sfp_regs = (void *)(CONFIG_SYS_SFP_ADDR);
826 ulong hash[SHA256_BYTES/sizeof(ulong)];
827 char hash_str[NUM_HEX_CHARS + 1];
828 struct fsl_secboot_img_priv *img;
829 struct fsl_secboot_img_hdr *hdr;
831 int ret, i, hash_cmd = 0;
834 if (arg_hash_str != NULL) {
835 const char *cp = arg_hash_str;
838 if (*cp == '0' && *(cp + 1) == 'x')
841 /* The input string expected is in hex, where
842 * each 4 bits would be represented by a hex
843 * sha256 hash is 256 bits long, which would mean
844 * num of characters = 256 / 4
846 if (strlen(cp) != SHA256_NIBBLES) {
847 printf("%s is not a 256 bits hex string as expected\n",
852 for (i = 0; i < sizeof(hash)/sizeof(ulong); i++) {
853 strncpy(hash_str, cp + (i * NUM_HEX_CHARS),
855 hash_str[NUM_HEX_CHARS] = '\0';
856 if (!str2longbe(hash_str, &hash[i])) {
857 printf("%s is not a 256 bits hex string ",
866 img = malloc(sizeof(struct fsl_secboot_img_priv));
871 memset(img, 0, sizeof(struct fsl_secboot_img_priv));
873 /* Update the information in Private Struct */
875 img->ehdrloc = haddr;
876 img->img_addr_ptr = img_addr_ptr;
877 esbc = (u8 *)img->ehdrloc;
879 memcpy(hdr, esbc, sizeof(struct fsl_secboot_img_hdr));
881 /* read and validate esbc header */
882 ret = read_validate_esbc_client_header(img);
884 if (ret != ESBC_VALID_HDR) {
885 fsl_secboot_handle_error(ret);
889 /* SRKH present in SFP */
890 for (i = 0; i < NUM_SRKH_REGS; i++)
891 srk_hash[i] = srk_in32(&sfp_regs->srk_hash[i]);
894 * Calculate hash of key obtained via offset present in
895 * ESBC uboot client hdr
897 ret = calc_img_key_hash(img);
899 fsl_secblk_handle_error(ret);
903 /* Compare hash obtained above with SRK hash present in SFP */
905 ret = memcmp(&hash, &img->img_key_hash, SHA256_BYTES);
907 ret = memcmp(srk_hash, img->img_key_hash, SHA256_BYTES);
909 #if defined(CONFIG_FSL_ISBC_KEY_EXT)
910 if (!hash_cmd && check_ie(img))
915 fsl_secboot_handle_error(ERROR_ESBC_CLIENT_HASH_COMPARE_KEY);
919 ret = calculate_cmp_img_sig(img);
921 fsl_secboot_handle_error(ret);