// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2012 The Chromium OS Authors.
 *
 * (C) Copyright 2011
 * Joe Hershberger, National Instruments, joe.hershberger@ni.com
 *
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 */

#ifndef USE_HOSTCC
#include <common.h>
#include <command.h>
#include <malloc.h>
#include <mapmem.h>
#include <hw_sha.h>
#include <asm/io.h>
#include <linux/errno.h>
#else
#include "mkimage.h"
#include <time.h>
#include <image.h>
#endif /* !USE_HOSTCC*/

#include <hash.h>
#include <u-boot/crc.h>
#include <u-boot/sha1.h>
#include <u-boot/sha256.h>
#include <u-boot/md5.h>

#if defined(CONFIG_SHA1) && !defined(CONFIG_SHA_PROG_HW_ACCEL)
static int hash_init_sha1(struct hash_algo *algo, void **ctxp)
{
        sha1_context *ctx = malloc(sizeof(sha1_context));
        sha1_starts(ctx);
        *ctxp = ctx;
        return 0;
}

static int hash_update_sha1(struct hash_algo *algo, void *ctx, const void *buf,
                            unsigned int size, int is_last)
{
        sha1_update((sha1_context *)ctx, buf, size);
        return 0;
}

static int hash_finish_sha1(struct hash_algo *algo, void *ctx, void *dest_buf,
                            int size)
{
        if (size < algo->digest_size)
                return -1;

        sha1_finish((sha1_context *)ctx, dest_buf);
        free(ctx);
        return 0;
}
#endif

#if defined(CONFIG_SHA256) && !defined(CONFIG_SHA_PROG_HW_ACCEL)
static int hash_init_sha256(struct hash_algo *algo, void **ctxp)
{
        sha256_context *ctx = malloc(sizeof(sha256_context));
        sha256_starts(ctx);
        *ctxp = ctx;
        return 0;
}

static int hash_update_sha256(struct hash_algo *algo, void *ctx,
                              const void *buf, unsigned int size, int is_last)
{
        sha256_update((sha256_context *)ctx, buf, size);
        return 0;
}

static int hash_finish_sha256(struct hash_algo *algo, void *ctx, void
                              *dest_buf, int size)
{
        if (size < algo->digest_size)
                return -1;

        sha256_finish((sha256_context *)ctx, dest_buf);
        free(ctx);
        return 0;
}
#endif

static int hash_init_crc32(struct hash_algo *algo, void **ctxp)
{
        uint32_t *ctx = malloc(sizeof(uint32_t));
        *ctx = 0;
        *ctxp = ctx;
        return 0;
}

static int hash_update_crc32(struct hash_algo *algo, void *ctx,
                             const void *buf, unsigned int size, int is_last)
{
        *((uint32_t *)ctx) = crc32(*((uint32_t *)ctx), buf, size);
        return 0;
}

static int hash_finish_crc32(struct hash_algo *algo, void *ctx, void *dest_buf,
                             int size)
{
        if (size < algo->digest_size)
                return -1;

        *((uint32_t *)dest_buf) = *((uint32_t *)ctx);
        free(ctx);
        return 0;
}

/*
 * These are the hash algorithms we support.  If we have hardware acceleration
 * is enable we will use that, otherwise a software version of the algorithm.
 * Note that algorithm names must be in lower case.
 */
static struct hash_algo hash_algo[] = {
#ifdef CONFIG_SHA1
        {
                .name           = "sha1",
                .digest_size    = SHA1_SUM_LEN,
                .chunk_size     = CHUNKSZ_SHA1,
#ifdef CONFIG_SHA_HW_ACCEL
                .hash_func_ws   = hw_sha1,
#else
                .hash_func_ws   = sha1_csum_wd,
#endif
#ifdef CONFIG_SHA_PROG_HW_ACCEL
                .hash_init      = hw_sha_init,
                .hash_update    = hw_sha_update,
                .hash_finish    = hw_sha_finish,
#else
                .hash_init      = hash_init_sha1,
                .hash_update    = hash_update_sha1,
                .hash_finish    = hash_finish_sha1,
#endif
        },
#endif
#ifdef CONFIG_SHA256
        {
                .name           = "sha256",
                .digest_size    = SHA256_SUM_LEN,
                .chunk_size     = CHUNKSZ_SHA256,
#ifdef CONFIG_SHA_HW_ACCEL
                .hash_func_ws   = hw_sha256,
#else
                .hash_func_ws   = sha256_csum_wd,
#endif
#ifdef CONFIG_SHA_PROG_HW_ACCEL
                .hash_init      = hw_sha_init,
                .hash_update    = hw_sha_update,
                .hash_finish    = hw_sha_finish,
#else
                .hash_init      = hash_init_sha256,
                .hash_update    = hash_update_sha256,
                .hash_finish    = hash_finish_sha256,
#endif
        },
#endif
        {
                .name           = "crc32",
                .digest_size    = 4,
                .chunk_size     = CHUNKSZ_CRC32,
                .hash_func_ws   = crc32_wd_buf,
                .hash_init      = hash_init_crc32,
                .hash_update    = hash_update_crc32,
                .hash_finish    = hash_finish_crc32,
        },
};

/* Try to minimize code size for boards that don't want much hashing */
#if defined(CONFIG_SHA256) || defined(CONFIG_CMD_SHA1SUM) || \
        defined(CONFIG_CRC32_VERIFY) || defined(CONFIG_CMD_HASH)
#define multi_hash()    1
#else
#define multi_hash()    0
#endif

int hash_lookup_algo(const char *algo_name, struct hash_algo **algop)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
                if (!strcmp(algo_name, hash_algo[i].name)) {
                        *algop = &hash_algo[i];
                        return 0;
                }
        }

        debug("Unknown hash algorithm '%s'\n", algo_name);
        return -EPROTONOSUPPORT;
}

int hash_progressive_lookup_algo(const char *algo_name,
                                 struct hash_algo **algop)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
                if (!strcmp(algo_name, hash_algo[i].name)) {
                        if (hash_algo[i].hash_init) {
                                *algop = &hash_algo[i];
                                return 0;
                        }
                }
        }

        debug("Unknown hash algorithm '%s'\n", algo_name);
        return -EPROTONOSUPPORT;
}

#ifndef USE_HOSTCC
int hash_parse_string(const char *algo_name, const char *str, uint8_t *result)
{
        struct hash_algo *algo;
        int ret;
        int i;

        ret = hash_lookup_algo(algo_name, &algo);
        if (ret)
                return ret;

        for (i = 0; i < algo->digest_size; i++) {
                char chr[3];

                strncpy(chr, &str[i * 2], 2);
                result[i] = simple_strtoul(chr, NULL, 16);
        }

        return 0;
}

int hash_block(const char *algo_name, const void *data, unsigned int len,
               uint8_t *output, int *output_size)
{
        struct hash_algo *algo;
        int ret;

        ret = hash_lookup_algo(algo_name, &algo);
        if (ret)
                return ret;

        if (output_size && *output_size < algo->digest_size) {
                debug("Output buffer size %d too small (need %d bytes)",
                      *output_size, algo->digest_size);
                return -ENOSPC;
        }
        if (output_size)
                *output_size = algo->digest_size;
        algo->hash_func_ws(data, len, output, algo->chunk_size);

        return 0;
}

#if defined(CONFIG_CMD_HASH) || defined(CONFIG_CMD_SHA1SUM) || defined(CONFIG_CMD_CRC32)
/**
 * store_result: Store the resulting sum to an address or variable
 *
 * @algo:               Hash algorithm being used
 * @sum:                Hash digest (algo->digest_size bytes)
 * @dest:               Destination, interpreted as a hex address if it starts
 *                      with * (or allow_env_vars is 0) or otherwise as an
 *                      environment variable.
 * @allow_env_vars:     non-zero to permit storing the result to an
 *                      variable environment
 */
static void store_result(struct hash_algo *algo, const uint8_t *sum,
                         const char *dest, int allow_env_vars)
{
        unsigned int i;
        int env_var = 0;

        /*
         * If environment variables are allowed, then we assume that 'dest'
         * is an environment variable, unless it starts with *, in which
         * case we assume it is an address. If not allowed, it is always an
         * address. This is to support the crc32 command.
         */
        if (allow_env_vars) {
                if (*dest == '*')
                        dest++;
                else
                        env_var = 1;
        }

        if (env_var) {
                char str_output[HASH_MAX_DIGEST_SIZE * 2 + 1];
                char *str_ptr = str_output;

                for (i = 0; i < algo->digest_size; i++) {
                        sprintf(str_ptr, "%02x", sum[i]);
                        str_ptr += 2;
                }
                *str_ptr = '\0';
                env_set(dest, str_output);
        } else {
                ulong addr;
                void *buf;

                addr = simple_strtoul(dest, NULL, 16);
                buf = map_sysmem(addr, algo->digest_size);
                memcpy(buf, sum, algo->digest_size);
                unmap_sysmem(buf);
        }
}

/**
 * parse_verify_sum: Parse a hash verification parameter
 *
 * @algo:               Hash algorithm being used
 * @verify_str:         Argument to parse. If it starts with * then it is
 *                      interpreted as a hex address containing the hash.
 *                      If the length is exactly the right number of hex digits
 *                      for the digest size, then we assume it is a hex digest.
 *                      Otherwise we assume it is an environment variable, and
 *                      look up its value (it must contain a hex digest).
 * @vsum:               Returns binary digest value (algo->digest_size bytes)
 * @allow_env_vars:     non-zero to permit storing the result to an environment
 *                      variable. If 0 then verify_str is assumed to be an
 *                      address, and the * prefix is not expected.
 * @return 0 if ok, non-zero on error
 */
static int parse_verify_sum(struct hash_algo *algo, char *verify_str,
                            uint8_t *vsum, int allow_env_vars)
{
        int env_var = 0;

        /* See comment above in store_result() */
        if (allow_env_vars) {
                if (*verify_str == '*')
                        verify_str++;
                else
                        env_var = 1;
        }

        if (!env_var) {
                ulong addr;
                void *buf;

                addr = simple_strtoul(verify_str, NULL, 16);
                buf = map_sysmem(addr, algo->digest_size);
                memcpy(vsum, buf, algo->digest_size);
        } else {
                char *vsum_str;
                int digits = algo->digest_size * 2;

                /*
                 * As with the original code from sha1sum.c, we assume that a
                 * string which matches the digest size exactly is a hex
                 * string and not an environment variable.
                 */
                if (strlen(verify_str) == digits)
                        vsum_str = verify_str;
                else {
                        vsum_str = env_get(verify_str);
                        if (vsum_str == NULL || strlen(vsum_str) != digits) {
                                printf("Expected %d hex digits in env var\n",
                                       digits);
                                return 1;
                        }
                }

                hash_parse_string(algo->name, vsum_str, vsum);
        }
        return 0;
}

static void hash_show(struct hash_algo *algo, ulong addr, ulong len, uint8_t *output)
{
        int i;

        printf("%s for %08lx ... %08lx ==> ", algo->name, addr, addr + len - 1);
        for (i = 0; i < algo->digest_size; i++)
                printf("%02x", output[i]);
}

int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
                 int argc, char * const argv[])
{
        ulong addr, len;

        if ((argc < 2) || ((flags & HASH_FLAG_VERIFY) && (argc < 3)))
                return CMD_RET_USAGE;

        addr = simple_strtoul(*argv++, NULL, 16);
        len = simple_strtoul(*argv++, NULL, 16);

        if (multi_hash()) {
                struct hash_algo *algo;
                u8 *output;
                uint8_t vsum[HASH_MAX_DIGEST_SIZE];
                void *buf;

                if (hash_lookup_algo(algo_name, &algo)) {
                        printf("Unknown hash algorithm '%s'\n", algo_name);
                        return CMD_RET_USAGE;
                }
                argc -= 2;

                if (algo->digest_size > HASH_MAX_DIGEST_SIZE) {
                        puts("HASH_MAX_DIGEST_SIZE exceeded\n");
                        return 1;
                }

                output = memalign(ARCH_DMA_MINALIGN,
                                  sizeof(uint32_t) * HASH_MAX_DIGEST_SIZE);

                buf = map_sysmem(addr, len);
                algo->hash_func_ws(buf, len, output, algo->chunk_size);
                unmap_sysmem(buf);

                /* Try to avoid code bloat when verify is not needed */
#if defined(CONFIG_CRC32_VERIFY) || defined(CONFIG_SHA1SUM_VERIFY) || \
        defined(CONFIG_HASH_VERIFY)
                if (flags & HASH_FLAG_VERIFY) {
#else
                if (0) {
#endif
                        if (parse_verify_sum(algo, *argv, vsum,
                                        flags & HASH_FLAG_ENV)) {
                                printf("ERROR: %s does not contain a valid "
                                        "%s sum\n", *argv, algo->name);
                                return 1;
                        }
                        if (memcmp(output, vsum, algo->digest_size) != 0) {
                                int i;

                                hash_show(algo, addr, len, output);
                                printf(" != ");
                                for (i = 0; i < algo->digest_size; i++)
                                        printf("%02x", vsum[i]);
                                puts(" ** ERROR **\n");
                                return 1;
                        }
                } else {
                        hash_show(algo, addr, len, output);
                        printf("\n");

                        if (argc) {
                                store_result(algo, output, *argv,
                                        flags & HASH_FLAG_ENV);
                        }
                unmap_sysmem(output);

                }

        /* Horrible code size hack for boards that just want crc32 */
        } else {
                ulong crc;
                ulong *ptr;

                crc = crc32_wd(0, (const uchar *)addr, len, CHUNKSZ_CRC32);

                printf("CRC32 for %08lx ... %08lx ==> %08lx\n",
                                addr, addr + len - 1, crc);

                if (argc >= 3) {
                        ptr = (ulong *)simple_strtoul(argv[0], NULL, 16);
                        *ptr = crc;
                }
        }

        return 0;
}
#endif /* CONFIG_CMD_HASH || CONFIG_CMD_SHA1SUM || CONFIG_CMD_CRC32) */
#endif /* !USE_HOSTCC */