[U-Boot] [PATCH v5] xilinx: zynq: Add support to secure images
Michal Simek
michal.simek at xilinx.com
Wed Jun 27 14:33:41 UTC 2018
On 26.6.2018 11:32, Siva Durga Prasad Paladugu wrote:
> This patch basically adds two new commands for loadig secure
> images.
> 1. zynq rsa adds support to load secure image which can be both
> authenticated or encrypted or both authenticated and encrypted
> image in xilinx bootimage(BOOT.bin) format.
> 2. zynq aes command adds support to decrypt and load encrypted
> image back to DDR as per destination address. The image has
> to be encrypted using xilinx bootgen tool and to get only the
> encrypted image from tool use -split option while invoking
> bootgen.
>
> Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu at xilinx.com>
> ---
> Changes from v4:
> - Moved license to top of file as per comment
> - Removed unused variable ppkexp
> - Used void * for buf, added check for buf allocation and freeing buf
> - Fixed coding style comments and fsbl_len usage
>
> Changes from v3:
> - Removed aesload and aesloadp as encrypted bitstream load
> is under duscussion and hence removed from this patch. Will
> work on it as a separate patch once discussion finalized.
> _ Fixed coding style comments
>
> Changes from v2:
> - Created separate commands for zynq aesload and aesloadp
> as per comment
> - Fixed all other coding style comments
>
> Changes from v1:
> - Defined two config synbols for RSA and AES separately
> and used them wherever required.
> - Used U_BOOT_CMD_KENT as per comment
> - Cleared DEVCFG_CTRL_PCAP_RATE_EN_MASK once decryption is
> done.
>
> Changes from RFC:
> - Moved zynqaes to board/xilinx/zynq/cmds.c and renamed as
> "zynq aes".
> - Moved boot image parsing code to a separate file.
> - Squashed in to a single patch.
> - Fixed coding style comments.
> ---
> arch/arm/Kconfig | 1 +
> arch/arm/mach-zynq/include/mach/hardware.h | 1 +
> board/xilinx/zynq/Kconfig | 33 ++
> board/xilinx/zynq/Makefile | 5 +
> board/xilinx/zynq/bootimg.c | 143 ++++++++
> board/xilinx/zynq/cmds.c | 513 +++++++++++++++++++++++++++++
> drivers/fpga/zynqpl.c | 45 +++
> include/u-boot/rsa-mod-exp.h | 4 +
> include/zynq_bootimg.h | 33 ++
> include/zynqpl.h | 4 +
> lib/rsa/rsa-mod-exp.c | 51 +++
> 11 files changed, 833 insertions(+)
> create mode 100644 board/xilinx/zynq/Kconfig
> create mode 100644 board/xilinx/zynq/bootimg.c
> create mode 100644 board/xilinx/zynq/cmds.c
> create mode 100644 include/zynq_bootimg.h
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 3e05f79..e78e1a4 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1428,6 +1428,7 @@ source "board/toradex/colibri_pxa270/Kconfig"
> source "board/vscom/baltos/Kconfig"
> source "board/woodburn/Kconfig"
> source "board/work-microwave/work_92105/Kconfig"
> +source "board/xilinx/zynq/Kconfig"
> source "board/xilinx/zynqmp/Kconfig"
> source "board/zipitz2/Kconfig"
>
> diff --git a/arch/arm/mach-zynq/include/mach/hardware.h b/arch/arm/mach-zynq/include/mach/hardware.h
> index f69cf00..3ff3c10 100644
> --- a/arch/arm/mach-zynq/include/mach/hardware.h
> +++ b/arch/arm/mach-zynq/include/mach/hardware.h
> @@ -20,6 +20,7 @@
> #define ZYNQ_EFUSE_BASEADDR 0xF800D000
> #define ZYNQ_USB_BASEADDR0 0xE0002000
> #define ZYNQ_USB_BASEADDR1 0xE0003000
> +#define ZYNQ_OCM_BASEADDR 0xFFFC0000
>
> /* Bootmode setting values */
> #define ZYNQ_BM_MASK 0x7
> diff --git a/board/xilinx/zynq/Kconfig b/board/xilinx/zynq/Kconfig
> new file mode 100644
> index 0000000..196c8e2
> --- /dev/null
> +++ b/board/xilinx/zynq/Kconfig
> @@ -0,0 +1,33 @@
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# Copyright (c) 2018, Xilinx, Inc.
> +
> +if ARCH_ZYNQ
> +
> +config CMD_ZYNQ
> + bool "Enable Zynq specific commands"
> + default y
> + help
> + Enables Zynq specific commands.
> +
> +config CMD_ZYNQ_AES
> + bool "Enable zynq aes command for decryption of encrypted images"
> + depends on CMD_ZYNQ
> + depends on FPGA_ZYNQPL
> + help
> + Decrypts the encrypted image present in source address
> + and places the decrypted image at destination address.
> +
> +config CMD_ZYNQ_RSA
> + bool "Enable zynq rsa command for loading secure images"
> + default y
> + depends on CMD_ZYNQ
> + select CMD_ZYNQ_AES
> + help
> + Enabling this will support zynq secure image verification.
> + The secure image is a xilinx specific BOOT.BIN with
> + either authentication or encryption or both encryption
> + and authentication feature enabled while generating
> + BOOT.BIN using Xilinx bootgen tool.
> +
> +endif
> diff --git a/board/xilinx/zynq/Makefile b/board/xilinx/zynq/Makefile
> index 5a76a26..f4996fa 100644
> --- a/board/xilinx/zynq/Makefile
> +++ b/board/xilinx/zynq/Makefile
> @@ -18,6 +18,11 @@ $(warning Put custom ps7_init_gpl.c/h to board/xilinx/zynq/custom_hw_platform/))
> endif
> endif
>
> +ifndef CONFIG_SPL_BUILD
> +obj-$(CONFIG_CMD_ZYNQ) += cmds.o
> +obj-$(CONFIG_CMD_ZYNQ_RSA) += bootimg.o
> +endif
> +
> obj-$(CONFIG_SPL_BUILD) += $(init-objs)
>
> # Suppress "warning: function declaration isn't a prototype"
> diff --git a/board/xilinx/zynq/bootimg.c b/board/xilinx/zynq/bootimg.c
> new file mode 100644
> index 0000000..56d69cd
> --- /dev/null
> +++ b/board/xilinx/zynq/bootimg.c
> @@ -0,0 +1,143 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2018 Xilinx, Inc.
> + */
> +
> +#include <common.h>
> +#include <asm/io.h>
> +#include <asm/arch/hardware.h>
> +#include <asm/arch/sys_proto.h>
> +#include <u-boot/md5.h>
> +#include <zynq_bootimg.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +#define ZYNQ_IMAGE_PHDR_OFFSET 0x09C
> +#define ZYNQ_IMAGE_FSBL_LEN_OFFSET 0x040
> +#define ZYNQ_PART_HDR_CHKSUM_WORD_COUNT 0x0F
> +#define ZYNQ_PART_HDR_WORD_COUNT 0x10
> +#define ZYNQ_MAXIMUM_IMAGE_WORD_LEN 0x40000000
> +#define MD5_CHECKSUM_SIZE 16
> +
> +struct headerarray {
> + u32 fields[16];
> +};
> +
> +/*
> + * Check whether the given partition is last partition or not
> + */
> +static int zynq_islastpartition(struct headerarray *head)
> +{
> + int index;
> +
> + debug("%s\n", __func__);
> + if (head->fields[ZYNQ_PART_HDR_CHKSUM_WORD_COUNT] != 0xFFFFFFFF)
> + return -1;
> +
> + for (index = 0; index < ZYNQ_PART_HDR_WORD_COUNT - 1; index++) {
> + if (head->fields[index] != 0x0)
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Get the partition count from the partition header
> + */
> +int zynq_get_part_count(struct partition_hdr *part_hdr_info)
> +{
> + u32 count;
> + struct headerarray *hap;
> +
> + debug("%s\n", __func__);
> +
> + for (count = 0; count < ZYNQ_MAX_PARTITION_NUMBER; count++) {
> + hap = (struct headerarray *)&part_hdr_info[count];
> + if (zynq_islastpartition(hap) != -1)
> + break;
> + }
> +
> + return count;
> +}
> +
> +/*
> + * Get the partition info of all the partitions available.
> + */
> +int zynq_get_partition_info(u32 image_base_addr, u32 *fsbl_len,
> + struct partition_hdr *part_hdr)
> +{
> + u32 parthdroffset;
> +
> + *fsbl_len = *((u32 *)(image_base_addr + ZYNQ_IMAGE_FSBL_LEN_OFFSET));
> +
> + parthdroffset = *((u32 *)(image_base_addr + ZYNQ_IMAGE_PHDR_OFFSET));
> +
> + parthdroffset += image_base_addr;
> +
> + memcpy(part_hdr, (u32 *)parthdroffset,
> + (sizeof(struct partition_hdr) * ZYNQ_MAX_PARTITION_NUMBER));
> +
> + return 0;
> +}
> +
> +/*
> + * Check whether the partition header is valid or not
> + */
> +int zynq_validate_hdr(struct partition_hdr *header)
> +{
> + struct headerarray *hap;
> + u32 index;
> + u32 checksum;
> +
> + debug("%s\n", __func__);
> +
> + hap = (struct headerarray *)header;
> +
> + for (index = 0; index < ZYNQ_PART_HDR_WORD_COUNT; index++) {
> + if (hap->fields[index])
> + break;
> + }
> + if (index == ZYNQ_PART_HDR_WORD_COUNT)
> + return -1;
> +
> + checksum = 0;
> + for (index = 0; index < ZYNQ_PART_HDR_CHKSUM_WORD_COUNT; index++)
> + checksum += hap->fields[index];
> +
> + checksum ^= 0xFFFFFFFF;
> +
> + if (hap->fields[ZYNQ_PART_HDR_CHKSUM_WORD_COUNT] != checksum) {
> + printf("Error: Checksum 0x%8.8x != 0x%8.8x\n",
> + checksum, hap->fields[ZYNQ_PART_HDR_CHKSUM_WORD_COUNT]);
> + return -1;
> + }
> +
> + if (header->imagewordlen > ZYNQ_MAXIMUM_IMAGE_WORD_LEN) {
> + printf("INVALID_PARTITION_LENGTH\n");
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Validate the partition by calculationg the md5 checksum for the
> + * partition and compare with checksum present in checksum offset of
> + * partition
> + */
> +int zynq_validate_partition(u32 start_addr, u32 len, u32 chksum_off)
> +{
> + u8 checksum[MD5_CHECKSUM_SIZE];
> + u8 calchecksum[MD5_CHECKSUM_SIZE];
> +
> + memcpy(&checksum[0], (u32 *)chksum_off, MD5_CHECKSUM_SIZE);
> +
> + md5_wd((u8 *)start_addr, len, &calchecksum[0], 0x10000);
> +
> + if (!memcmp(checksum, calchecksum, MD5_CHECKSUM_SIZE))
> + return 0;
> +
> + printf("Error: Partition DataChecksum\n");
> + return -1;
> +}
> diff --git a/board/xilinx/zynq/cmds.c b/board/xilinx/zynq/cmds.c
> new file mode 100644
> index 0000000..0b2a817
> --- /dev/null
> +++ b/board/xilinx/zynq/cmds.c
> @@ -0,0 +1,513 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2018 Xilinx, Inc.
> + */
> +
> +#include <common.h>
> +#include <asm/io.h>
> +#include <asm/arch/hardware.h>
> +#include <asm/arch/sys_proto.h>
> +#include <malloc.h>
> +#include <u-boot/md5.h>
> +#include <u-boot/rsa.h>
> +#include <u-boot/rsa-mod-exp.h>
> +#include <u-boot/sha256.h>
> +#include <zynqpl.h>
> +#include <fpga.h>
> +#include <zynq_bootimg.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +#ifdef CONFIG_CMD_ZYNQ_RSA
> +
> +#define ZYNQ_EFUSE_RSA_ENABLE_MASK 0x400
> +#define ZYNQ_ATTRIBUTE_PL_IMAGE_MASK 0x20
> +#define ZYNQ_ATTRIBUTE_CHECKSUM_TYPE_MASK 0x7000
> +#define ZYNQ_ATTRIBUTE_RSA_PRESENT_MASK 0x8000
> +#define ZYNQ_ATTRIBUTE_RSA_PART_OWNER_MASK 0x30000
> +
> +#define ZYNQ_RSA_MODULAR_SIZE 256
> +#define ZYNQ_RSA_MODULAR_EXT_SIZE 256
> +#define ZYNQ_RSA_EXPO_SIZE 64
> +#define ZYNQ_RSA_SPK_SIGNATURE_SIZE 256
> +#define ZYNQ_RSA_PARTITION_SIGNATURE_SIZE 256
> +#define ZYNQ_RSA_SIGNATURE_SIZE 0x6C0
> +#define ZYNQ_RSA_HEADER_SIZE 4
> +#define ZYNQ_RSA_MAGIC_WORD_SIZE 60
> +#define ZYNQ_RSA_PART_OWNER_UBOOT 1
> +#define ZYNQ_RSA_ALIGN_PPK_START 64
> +
> +#define WORD_LENGTH_SHIFT 2
> +
> +static u8 *ppkmodular;
> +static u8 *ppkmodularex;
> +
> +struct zynq_rsa_public_key {
> + uint len; /* Length of modulus[] in number of u32 */
> + u32 n0inv; /* -1 / modulus[0] mod 2^32 */
> + u32 *modulus; /* modulus as little endian array */
> + u32 *rr; /* R^2 as little endian array */
> +};
> +
> +static struct zynq_rsa_public_key public_key;
> +
> +static struct partition_hdr part_hdr[ZYNQ_MAX_PARTITION_NUMBER];
> +
> +/*
> + * Extract the primary public key components from already autheticated FSBL
> + */
> +static void zynq_extract_ppk(u32 fsbl_len)
> +{
> + u32 padsize;
> + u8 *ppkptr;
> +
> + debug("%s\n", __func__);
> +
> + /*
> + * Extract the authenticated PPK from OCM i.e at end of the FSBL
> + */
> + ppkptr = (u8 *)(fsbl_len + ZYNQ_OCM_BASEADDR);
> + padsize = ((u32)ppkptr % ZYNQ_RSA_ALIGN_PPK_START);
> + if (padsize)
> + ppkptr += (ZYNQ_RSA_ALIGN_PPK_START - padsize);
> +
> + ppkptr += ZYNQ_RSA_HEADER_SIZE;
> +
> + ppkptr += ZYNQ_RSA_MAGIC_WORD_SIZE;
> +
> + ppkmodular = (u8 *)ppkptr;
> + ppkptr += ZYNQ_RSA_MODULAR_SIZE;
> + ppkmodularex = (u8 *)ppkptr;
> + ppkptr += ZYNQ_RSA_MODULAR_EXT_SIZE;
> +}
> +
> +/*
> + * Calculate the inverse(-1 / modulus[0] mod 2^32 ) for the PPK
> + */
> +static u32 zynq_calc_inv(void)
> +{
> + u32 modulus = public_key.modulus[0];
> + u32 tmp = BIT(1);
> + u32 inverse;
> +
> + inverse = modulus & BIT(0);
> +
> + while (tmp) {
> + inverse *= 2 - modulus * inverse;
> + tmp *= tmp;
> + }
> +
> + return ~(inverse - 1);
> +}
> +
> +/*
> + * Recreate the signature by padding the bytes and verify with hash value
> + */
> +static int zynq_pad_and_check(u8 *signature, u8 *hash)
> +{
> + u8 padding[] = {0x30, 0x31, 0x30, 0x0D, 0x06, 0x09, 0x60, 0x86, 0x48,
> + 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04,
> + 0x20};
> + u8 *pad_ptr = signature + 256;
> + u32 pad = 202;
> + u32 ii;
> +
> + /*
> + * Re-Create PKCS#1v1.5 Padding
> + * MSB ----------------------------------------------------LSB
> + * 0x0 || 0x1 || 0xFF(for 202 bytes) || 0x0 || T_padding || SHA256 Hash
> + */
> + if (*--pad_ptr != 0 || *--pad_ptr != 1)
> + return -1;
> +
> + for (ii = 0; ii < pad; ii++) {
> + if (*--pad_ptr != 0xFF)
> + return -1;
> + }
> +
> + if (*--pad_ptr != 0)
> + return -1;
> +
> + for (ii = 0; ii < sizeof(padding); ii++) {
> + if (*--pad_ptr != padding[ii])
> + return -1;
> + }
> +
> + for (ii = 0; ii < 32; ii++) {
> + if (*--pad_ptr != hash[ii])
> + return -1;
> + }
> + return 0;
> +}
> +
> +/*
> + * Verify and extract the hash value from signature using the public key
> + * and compare it with calculated hash value.
> + */
> +static int zynq_rsa_verify_key(const struct zynq_rsa_public_key *key,
> + const u8 *sig, const u32 sig_len, const u8 *hash)
> +{
> + int status;
> + void *buf;
> +
> + if (!key || !sig || !hash)
> + return -1;
> +
> + if (sig_len != (key->len * sizeof(u32))) {
> + printf("Signature is of incorrect length %d\n", sig_len);
> + return -1;
> + }
> +
> + /* Sanity check for stack size */
> + if (sig_len > ZYNQ_RSA_SPK_SIGNATURE_SIZE) {
> + printf("Signature length %u exceeds maximum %d\n", sig_len,
> + ZYNQ_RSA_SPK_SIGNATURE_SIZE);
> + return -1;
> + }
> +
> + buf = malloc(sig_len);
> + if (!buf)
> + return -1;
> +
> + memcpy(buf, sig, sig_len);
> +
> + status = zynq_pow_mod((u32 *)key, (u32 *)buf);
> + if (status == -1) {
> + free(buf);
> + return status;
> + }
> +
> + status = zynq_pad_and_check((u8 *)buf, (u8 *)hash);
> +
> + free(buf);
> + return status;
> +}
> +
> +/*
> + * Authenticate the partition
> + */
> +static int zynq_authenticate_part(u8 *buffer, u32 size)
> +{
> + u8 hash_signature[32];
> + u8 *spk_modular;
> + u8 *spk_modular_ex;
> + u8 *signature_ptr;
> + u32 status;
> +
> + debug("%s\n", __func__);
> +
> + signature_ptr = (u8 *)(buffer + size - ZYNQ_RSA_SIGNATURE_SIZE);
> +
> + signature_ptr += ZYNQ_RSA_HEADER_SIZE;
> +
> + signature_ptr += ZYNQ_RSA_MAGIC_WORD_SIZE;
> +
> + ppkmodular = (u8 *)signature_ptr;
> + signature_ptr += ZYNQ_RSA_MODULAR_SIZE;
> + ppkmodularex = signature_ptr;
> + signature_ptr += ZYNQ_RSA_MODULAR_EXT_SIZE;
> + signature_ptr += ZYNQ_RSA_EXPO_SIZE;
> +
> + sha256_csum_wd((const unsigned char *)signature_ptr,
> + (ZYNQ_RSA_MODULAR_EXT_SIZE + ZYNQ_RSA_EXPO_SIZE +
> + ZYNQ_RSA_MODULAR_SIZE),
> + (unsigned char *)hash_signature, 0x1000);
> +
> + spk_modular = (u8 *)signature_ptr;
> + signature_ptr += ZYNQ_RSA_MODULAR_SIZE;
> + spk_modular_ex = (u8 *)signature_ptr;
> + signature_ptr += ZYNQ_RSA_MODULAR_EXT_SIZE;
> + signature_ptr += ZYNQ_RSA_EXPO_SIZE;
> +
> + public_key.len = ZYNQ_RSA_MODULAR_SIZE / sizeof(u32);
> + public_key.modulus = (u32 *)ppkmodular;
> + public_key.rr = (u32 *)ppkmodularex;
> + public_key.n0inv = zynq_calc_inv();
> +
> + status = zynq_rsa_verify_key(&public_key, signature_ptr,
> + ZYNQ_RSA_SPK_SIGNATURE_SIZE,
> + hash_signature);
> + if (status)
> + return status;
> +
> + signature_ptr += ZYNQ_RSA_SPK_SIGNATURE_SIZE;
> +
> + sha256_csum_wd((const unsigned char *)buffer,
> + (size - ZYNQ_RSA_PARTITION_SIGNATURE_SIZE),
> + (unsigned char *)hash_signature, 0x1000);
> +
> + public_key.len = ZYNQ_RSA_MODULAR_SIZE / sizeof(u32);
> + public_key.modulus = (u32 *)spk_modular;
> + public_key.rr = (u32 *)spk_modular_ex;
> + public_key.n0inv = zynq_calc_inv();
> +
> + return zynq_rsa_verify_key(&public_key, (u8 *)signature_ptr,
> + ZYNQ_RSA_PARTITION_SIGNATURE_SIZE,
> + (u8 *)hash_signature);
> +}
> +
> +/*
> + * Parses the partition header and verfies the authenticated and
> + * encrypted image.
> + */
> +static int zynq_verify_image(u32 src_ptr)
> +{
> + u32 silicon_ver, image_base_addr, status;
> + u32 partition_num = 0;
> + u32 efuseval, srcaddr, size, fsbl_len;
> + struct partition_hdr *hdr_ptr;
> + u32 part_data_len, part_img_len, part_attr;
> + u32 part_load_addr, part_dst_addr, part_chksum_offset;
> + u32 part_start_addr, part_total_size, partitioncount;
> + bool encrypt_part_flag = false;
> + bool part_chksum_flag = false;
> + bool signed_part_flag = false;
> +
> + image_base_addr = src_ptr;
> +
> + silicon_ver = zynq_get_silicon_version();
> +
> + /* RSA not supported in silicon versions 1.0 and 2.0 */
> + if (silicon_ver == 0 || silicon_ver == 1)
> + return -1;
> +
> + zynq_get_partition_info(image_base_addr, &fsbl_len,
> + &part_hdr[0]);
> +
> + /* Extract ppk if efuse was blown Otherwise return error */
> + efuseval = readl(&efuse_base->status);
> + if (!(efuseval & ZYNQ_EFUSE_RSA_ENABLE_MASK))
> + return -1;
> +
> + zynq_extract_ppk(fsbl_len);
> +
> + partitioncount = zynq_get_part_count(&part_hdr[0]);
> +
> + /*
> + * As the first two partitions are related to fsbl,
> + * we can ignore those two in bootimage and the below
> + * code doesn't need to validate it as fsbl is already
> + * done by now
> + */
> + if (partitioncount <= 2 ||
> + partitioncount > ZYNQ_MAX_PARTITION_NUMBER)
> + return -1;
> +
> + while (partition_num < partitioncount) {
> + if (((part_hdr[partition_num].partitionattr &
> + ZYNQ_ATTRIBUTE_RSA_PART_OWNER_MASK) >> 16) !=
> + ZYNQ_RSA_PART_OWNER_UBOOT) {
> + printf("UBOOT is not Owner for partition %d\n",
> + partition_num);
> + partition_num++;
> + continue;
> + }
> + hdr_ptr = &part_hdr[partition_num];
> + status = zynq_validate_hdr(hdr_ptr);
> + if (status)
> + return status;
> +
> + part_data_len = hdr_ptr->datawordlen;
> + part_img_len = hdr_ptr->imagewordlen;
> + part_attr = hdr_ptr->partitionattr;
> + part_load_addr = hdr_ptr->loadaddr;
> + part_chksum_offset = hdr_ptr->checksumoffset;
> + part_start_addr = hdr_ptr->partitionstart;
> + part_total_size = hdr_ptr->partitionwordlen;
> +
> + if (part_data_len != part_img_len) {
> + debug("Encrypted\n");
> + encrypt_part_flag = true;
> + }
> +
> + if (part_attr & ZYNQ_ATTRIBUTE_CHECKSUM_TYPE_MASK)
> + part_chksum_flag = true;
> +
> + if (part_attr & ZYNQ_ATTRIBUTE_RSA_PRESENT_MASK) {
> + debug("RSA Signed\n");
> + signed_part_flag = true;
> + size = part_total_size << WORD_LENGTH_SHIFT;
> + } else {
> + size = part_img_len;
> + }
> +
> + if (!signed_part_flag && !part_chksum_flag) {
> + printf("Partition not signed & no chksum\n");
> + partition_num++;
> + continue;
> + }
> +
> + srcaddr = image_base_addr +
> + (part_start_addr << WORD_LENGTH_SHIFT);
> +
> + /*
> + * This validation is just for PS DDR.
> + * TODO: Update this for PL DDR check as well.
> + */
> + if (part_load_addr < gd->bd->bi_dram[0].start &&
> + ((part_load_addr + part_data_len) >
> + (gd->bd->bi_dram[0].start +
> + gd->bd->bi_dram[0].size))) {
> + printf("INVALID_LOAD_ADDRESS_FAIL\n");
> + return -1;
> + }
> +
> + if (part_attr & ZYNQ_ATTRIBUTE_PL_IMAGE_MASK)
> + part_load_addr = srcaddr;
> + else
> + memcpy((u32 *)part_load_addr, (u32 *)srcaddr,
> + size);
> +
> + if (part_chksum_flag) {
> + part_chksum_offset = image_base_addr +
> + (part_chksum_offset <<
> + WORD_LENGTH_SHIFT);
> + status = zynq_validate_partition(part_load_addr,
> + (part_total_size <<
> + WORD_LENGTH_SHIFT),
> + part_chksum_offset);
> + if (status != 0) {
> + printf("PART_CHKSUM_FAIL\n");
> + return -1;
> + }
> + debug("Partition Validation Done\n");
> + }
> +
> + if (signed_part_flag) {
> + status = zynq_authenticate_part((u8 *)part_load_addr,
> + size);
> + if (status != 0) {
> + printf("AUTHENTICATION_FAIL\n");
> + return -1;
> + }
> + debug("Authentication Done\n");
> + }
> +
> + if (encrypt_part_flag) {
> + debug("DECRYPTION\n");
> +
> + part_dst_addr = part_load_addr;
> +
> + if (part_attr & ZYNQ_ATTRIBUTE_PL_IMAGE_MASK) {
> + partition_num++;
> + continue;
> + }
> +
> + status = zynq_decrypt_load(part_load_addr,
> + part_img_len,
> + part_dst_addr,
> + part_data_len);
> + if (status != 0) {
> + printf("DECRYPTION_FAIL\n");
> + return -1;
> + }
> + }
> + partition_num++;
> + }
> +
> + return 0;
> +}
> +
> +static int do_zynq_rsa(cmd_tbl_t *cmdtp, int flag, int argc,
> + char * const argv[])
> +{
> + u32 src_ptr;
> + char *endp;
> +
> + src_ptr = simple_strtoul(argv[2], &endp, 16);
> + if (*argv[2] == 0 || *endp != 0)
> + return CMD_RET_USAGE;
> + if (zynq_verify_image(src_ptr))
> + return CMD_RET_FAILURE;
> +
> + return CMD_RET_SUCCESS;
> +}
> +#endif
> +
> +#ifdef CONFIG_CMD_ZYNQ_AES
> +static int zynq_decrypt_image(cmd_tbl_t *cmdtp, int flag, int argc,
> + char * const argv[])
> +{
> + char *endp;
> + u32 srcaddr, srclen, dstaddr, dstlen;
> + int status;
> +
> + srcaddr = simple_strtoul(argv[2], &endp, 16);
> + if (*argv[2] == 0 || *endp != 0)
> + return CMD_RET_USAGE;
> + srclen = simple_strtoul(argv[3], &endp, 16);
> + if (*argv[3] == 0 || *endp != 0)
> + return CMD_RET_USAGE;
> + dstaddr = simple_strtoul(argv[4], &endp, 16);
> + if (*argv[4] == 0 || *endp != 0)
> + return CMD_RET_USAGE;
> + dstlen = simple_strtoul(argv[5], &endp, 16);
> + if (*argv[5] == 0 || *endp != 0)
> + return CMD_RET_USAGE;
> +
> + /*
> + * Roundup source and destination lengths to
> + * word size
> + */
> + if (srclen % 4)
> + srclen = roundup(srclen, 4);
> + if (dstlen % 4)
> + dstlen = roundup(dstlen, 4);
> +
> + status = zynq_decrypt_load(srcaddr, srclen >> 2, dstaddr, dstlen >> 2);
> + if (status != 0)
> + return CMD_RET_FAILURE;
> +
> + return CMD_RET_SUCCESS;
> +}
> +#endif
> +
> +static cmd_tbl_t zynq_commands[] = {
> +#ifdef CONFIG_CMD_ZYNQ_RSA
> + U_BOOT_CMD_MKENT(rsa, 3, 1, do_zynq_rsa, "", ""),
> +#endif
> +#ifdef CONFIG_CMD_ZYNQ_AES
> + U_BOOT_CMD_MKENT(aes, 6, 1, zynq_decrypt_image, "", ""),
> +#endif
> +};
> +
> +static int do_zynq(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
> +{
> + cmd_tbl_t *zynq_cmd;
> + int ret;
> +
> + if (!ARRAY_SIZE(zynq_commands)) {
> + puts("No zynq specific command enabled\n");
> + return CMD_RET_USAGE;
> + }
> +
> + if (argc < 2)
> + return CMD_RET_USAGE;
> + zynq_cmd = find_cmd_tbl(argv[1], zynq_commands,
> + ARRAY_SIZE(zynq_commands));
> + if (!zynq_cmd || argc != zynq_cmd->maxargs)
> + return CMD_RET_USAGE;
> +
> + ret = zynq_cmd->cmd(zynq_cmd, flag, argc, argv);
> +
> + return cmd_process_error(zynq_cmd, ret);
> +}
> +
> +static char zynq_help_text[] =
> + ""
> +#ifdef CONFIG_CMD_ZYNQ_RSA
> + "rsa <baseaddr> - Verifies the authenticated and encrypted\n"
> + " zynq images and loads them back to load\n"
> + " addresses as specified in BOOT image(BOOT.BIN)\n"
> +#endif
> +#ifdef CONFIG_CMD_ZYNQ_AES
> + "aes <srcaddr> <srclen> <dstaddr> <dstlen>\n"
> + " - Decrypts the encrypted image present in source\n"
> + " address and places the decrypted image at\n"
> + " destination address\n"
> +#endif
> + ;
> +
> +U_BOOT_CMD(zynq, 6, 0, do_zynq,
> + "Zynq specific commands", zynq_help_text
> +);
> diff --git a/drivers/fpga/zynqpl.c b/drivers/fpga/zynqpl.c
> index fd37d18..6409d30 100644
> --- a/drivers/fpga/zynqpl.c
> +++ b/drivers/fpga/zynqpl.c
> @@ -17,6 +17,7 @@
>
> #define DEVCFG_CTRL_PCFG_PROG_B 0x40000000
> #define DEVCFG_CTRL_PCFG_AES_EFUSE_MASK 0x00001000
> +#define DEVCFG_CTRL_PCAP_RATE_EN_MASK 0x02000000
> #define DEVCFG_ISR_FATAL_ERROR_MASK 0x00740040
> #define DEVCFG_ISR_ERROR_FLAGS_MASK 0x00340840
> #define DEVCFG_ISR_RX_FIFO_OV 0x00040000
> @@ -497,3 +498,47 @@ struct xilinx_fpga_op zynq_op = {
> .loadfs = zynq_loadfs,
> #endif
> };
> +
> +#ifdef CONFIG_CMD_ZYNQ_AES
> +/*
> + * Load the encrypted image from src addr and decrypt the image and
> + * place it back the decrypted image into dstaddr.
> + */
> +int zynq_decrypt_load(u32 srcaddr, u32 srclen, u32 dstaddr, u32 dstlen)
> +{
> + if (srcaddr < SZ_1M || dstaddr < SZ_1M) {
> + printf("%s: src and dst addr should be > 1M\n",
> + __func__);
> + return FPGA_FAIL;
> + }
> +
> + if (zynq_dma_xfer_init(BIT_NONE)) {
> + printf("%s: zynq_dma_xfer_init FAIL\n", __func__);
> + return FPGA_FAIL;
> + }
> +
> + writel((readl(&devcfg_base->ctrl) | DEVCFG_CTRL_PCAP_RATE_EN_MASK),
> + &devcfg_base->ctrl);
> +
> + debug("%s: Source = 0x%08X\n", __func__, (u32)srcaddr);
> + debug("%s: Size = %zu\n", __func__, srclen);
> +
> + /* flush(clean & invalidate) d-cache range buf */
> + flush_dcache_range((u32)srcaddr, (u32)srcaddr +
> + roundup(srclen << 2, ARCH_DMA_MINALIGN));
> + /*
> + * Flush destination address range only if image is not
> + * bitstream.
> + */
> + flush_dcache_range((u32)dstaddr, (u32)dstaddr +
> + roundup(dstlen << 2, ARCH_DMA_MINALIGN));
> +
> + if (zynq_dma_transfer(srcaddr | 1, srclen, dstaddr | 1, dstlen))
> + return FPGA_FAIL;
> +
> + writel((readl(&devcfg_base->ctrl) & ~DEVCFG_CTRL_PCAP_RATE_EN_MASK),
> + &devcfg_base->ctrl);
> +
> + return FPGA_SUCCESS;
> +}
> +#endif
> diff --git a/include/u-boot/rsa-mod-exp.h b/include/u-boot/rsa-mod-exp.h
> index 3253614..8a428c4 100644
> --- a/include/u-boot/rsa-mod-exp.h
> +++ b/include/u-boot/rsa-mod-exp.h
> @@ -42,6 +42,10 @@ int rsa_mod_exp_sw(const uint8_t *sig, uint32_t sig_len,
> int rsa_mod_exp(struct udevice *dev, const uint8_t *sig, uint32_t sig_len,
> struct key_prop *node, uint8_t *out);
>
> +#if defined(CONFIG_CMD_ZYNQ_RSA)
> +int zynq_pow_mod(u32 *keyptr, u32 *inout);
> +#endif
> +
> /**
> * struct struct mod_exp_ops - Driver model for RSA Modular Exponentiation
> * operations
> diff --git a/include/zynq_bootimg.h b/include/zynq_bootimg.h
> new file mode 100644
> index 0000000..c39c0bf
> --- /dev/null
> +++ b/include/zynq_bootimg.h
> @@ -0,0 +1,33 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2018 Xilinx, Inc.
> + */
> +
> +#ifndef _ZYNQ_BOOTIMG_H_
> +#define _ZYNQ_BOOTIMG_H_
> +
> +#define ZYNQ_MAX_PARTITION_NUMBER 0xE
> +
> +struct partition_hdr {
> + u32 imagewordlen; /* 0x0 */
> + u32 datawordlen; /* 0x4 */
> + u32 partitionwordlen; /* 0x8 */
> + u32 loadaddr; /* 0xC */
> + u32 execaddr; /* 0x10 */
> + u32 partitionstart; /* 0x14 */
> + u32 partitionattr; /* 0x18 */
> + u32 sectioncount; /* 0x1C */
> + u32 checksumoffset; /* 0x20 */
> + u32 pads1[1];
> + u32 acoffset; /* 0x28 */
> + u32 pads2[4];
> + u32 checksum; /* 0x3C */
> +};
> +
> +int zynq_get_part_count(struct partition_hdr *part_hdr_info);
> +int zynq_get_partition_info(u32 image_base_addr, u32 *fsbl_len,
> + struct partition_hdr *part_hdr);
> +int zynq_validate_hdr(struct partition_hdr *header);
> +int zynq_validate_partition(u32 start_addr, u32 len, u32 chksum_off);
> +
> +#endif /* _ZYNQ_BOOTIMG_H_ */
> diff --git a/include/zynqpl.h b/include/zynqpl.h
> index cdfd8a2..766e691 100644
> --- a/include/zynqpl.h
> +++ b/include/zynqpl.h
> @@ -11,6 +11,10 @@
>
> #include <xilinx.h>
>
> +#ifdef CONFIG_CMD_ZYNQ_AES
> +int zynq_decrypt_load(u32 srcaddr, u32 dstaddr, u32 srclen, u32 dstlen);
> +#endif
> +
> extern struct xilinx_fpga_op zynq_op;
>
> #define XILINX_ZYNQ_XC7Z007S 0x3
> diff --git a/lib/rsa/rsa-mod-exp.c b/lib/rsa/rsa-mod-exp.c
> index 031c710..420ab2e 100644
> --- a/lib/rsa/rsa-mod-exp.c
> +++ b/lib/rsa/rsa-mod-exp.c
> @@ -300,3 +300,54 @@ int rsa_mod_exp_sw(const uint8_t *sig, uint32_t sig_len,
>
> return 0;
> }
> +
> +#if defined(CONFIG_CMD_ZYNQ_RSA)
> +/**
> + * zynq_pow_mod - in-place public exponentiation
> + *
> + * @keyptr: RSA key
> + * @inout: Big-endian word array containing value and result
> + * @return 0 on successful calculation, otherwise failure error code
> + *
> + * FIXME: Use pow_mod() instead of zynq_pow_mod()
> + * pow_mod calculation required for zynq is bit different from
> + * pw_mod above here, hence defined zynq specific routine.
> + */
> +int zynq_pow_mod(u32 *keyptr, u32 *inout)
> +{
> + u32 *result, *ptr;
> + uint i;
> + struct rsa_public_key *key;
> + u32 val[RSA2048_BYTES], acc[RSA2048_BYTES], tmp[RSA2048_BYTES];
> +
> + key = (struct rsa_public_key *)keyptr;
> +
> + /* Sanity check for stack size - key->len is in 32-bit words */
> + if (key->len > RSA_MAX_KEY_BITS / 32) {
> + debug("RSA key words %u exceeds maximum %d\n", key->len,
> + RSA_MAX_KEY_BITS / 32);
> + return -EINVAL;
> + }
> +
> + result = tmp; /* Re-use location. */
> +
> + for (i = 0, ptr = inout; i < key->len; i++, ptr++)
> + val[i] = *(ptr);
> +
> + montgomery_mul(key, acc, val, key->rr); /* axx = a * RR / R mod M */
> + for (i = 0; i < 16; i += 2) {
> + montgomery_mul(key, tmp, acc, acc); /* tmp = acc^2 / R mod M */
> + montgomery_mul(key, acc, tmp, tmp); /* acc = tmp^2 / R mod M */
> + }
> + montgomery_mul(key, result, acc, val); /* result = XX * a / R mod M */
> +
> + /* Make sure result < mod; result is at most 1x mod too large. */
> + if (greater_equal_modulus(key, result))
> + subtract_modulus(key, result);
> +
> + for (i = 0, ptr = inout; i < key->len; i++, ptr++)
> + *ptr = result[i];
> +
> + return 0;
> +}
> +#endif
>
Applied.
Thanks,
Michal
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