/*
   * 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.
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #ifndef USE_HOSTCC
  #include <common.h>
  #include <command.h>
  #include <malloc.h>
  #include <hw_sha.h>
  #include <asm/io.h>
  #include <asm/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>
  
  #ifdef CONFIG_SHA1
  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
  
  #ifdef CONFIG_SHA256
  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. Chips which support accelerated
   * crypto could perhaps add named version of these algorithms here. Note that
   * algorithm names must be in lower case.
   */
  static struct hash_algo hash_algo[] = {
  	/*
  	 * CONFIG_SHA_HW_ACCEL is defined if hardware acceleration is
  	 * available.
  	 */
  #ifdef CONFIG_SHA_HW_ACCEL
  	{
  		"sha1",
  		SHA1_SUM_LEN,
  		hw_sha1,
  		CHUNKSZ_SHA1,
  #ifdef CONFIG_SHA_PROG_HW_ACCEL
  		hw_sha_init,
  		hw_sha_update,
  		hw_sha_finish,
  #endif
  	}, {
  		"sha256",
  		SHA256_SUM_LEN,
  		hw_sha256,
  		CHUNKSZ_SHA256,
  #ifdef CONFIG_SHA_PROG_HW_ACCEL
  		hw_sha_init,
  		hw_sha_update,
  		hw_sha_finish,
  #endif
  	},
  #endif
  #ifdef CONFIG_SHA1
  	{
  		"sha1",
  		SHA1_SUM_LEN,
  		sha1_csum_wd,
  		CHUNKSZ_SHA1,
  		hash_init_sha1,
  		hash_update_sha1,
  		hash_finish_sha1,
  	},
  #endif
  #ifdef CONFIG_SHA256
  	{
  		"sha256",
  		SHA256_SUM_LEN,
  		sha256_csum_wd,
  		CHUNKSZ_SHA256,
  		hash_init_sha256,
  		hash_update_sha256,
  		hash_finish_sha256,
  	},
  #endif
  	{
  		"crc32",
  		4,
  		crc32_wd_buf,
  		CHUNKSZ_CRC32,
  		hash_init_crc32,
  		hash_update_crc32,
  		hash_finish_crc32,
  	},
  };
  
  #if defined(CONFIG_SHA256) || defined(CONFIG_CMD_SHA1SUM)
  #define MULTI_HASH
  #endif
  
  #if defined(CONFIG_HASH_VERIFY) || defined(CONFIG_CMD_HASH)
  #define MULTI_HASH
  #endif
  
  /* Try to minimize code size for boards that don't want much hashing */
  #ifdef MULTI_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'
  ", 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'
  ", algo_name);
  	return -EPROTONOSUPPORT;
  }
  
  #ifndef USE_HOSTCC
  /**
   * 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';
  		setenv(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 {
  		unsigned int i;
  		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 = getenv(verify_str);
  			if (vsum_str == NULL || strlen(vsum_str) != digits) {
  				printf("Expected %d hex digits in env var
  ",
  				       digits);
  				return 1;
  			}
  		}
  
  		for (i = 0; i < algo->digest_size; i++) {
  			char *nullp = vsum_str + (i + 1) * 2;
  			char end = *nullp;
  
  			*nullp = '\0';
  			vsum[i] = simple_strtoul(vsum_str + (i * 2), NULL, 16);
  			*nullp = end;
  		}
  	}
  	return 0;
  }
  
  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_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;
  }
  
  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;
  		uint8_t output[HASH_MAX_DIGEST_SIZE];
  		uint8_t vsum[HASH_MAX_DIGEST_SIZE];
  		void *buf;
  
  		if (hash_lookup_algo(algo_name, &algo)) {
  			printf("Unknown hash algorithm '%s'
  ", algo_name);
  			return CMD_RET_USAGE;
  		}
  		argc -= 2;
  
  		if (algo->digest_size > HASH_MAX_DIGEST_SIZE) {
  			puts("HASH_MAX_DIGEST_SIZE exceeded
  ");
  			return 1;
  		}
  
  		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 */
  #ifdef 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
  ", *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 **
  ");
  				return 1;
  			}
  		} else {
  			hash_show(algo, addr, len, output);
  			printf("
  ");
  
  			if (argc) {
  				store_result(algo, output, *argv,
  					flags & HASH_FLAG_ENV);
  			}
  		}
  
  	/* 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
  ",
  				addr, addr + len - 1, crc);
  
  		if (argc >= 3) {
  			ptr = (ulong *)simple_strtoul(argv[0], NULL, 16);
  			*ptr = crc;
  		}
  	}
  
  	return 0;
  }
  #endif