[J-u-boot.git] / common / hash.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2012 The Chromium OS Authors.
 *
 * (C) Copyright 2011
 * Joe Hershberger, National Instruments, [email protected]
 *
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, [email protected].
 */

#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 */
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
460408ef SG	2	/*
	3	* Copyright (c) 2012 The Chromium OS Authors.
	4	*
	5	* (C) Copyright 2011
	6	* Joe Hershberger, National Instruments, [email protected]
	7	*
	8	* (C) Copyright 2000
	9	* Wolfgang Denk, DENX Software Engineering, [email protected].
460408ef SG	10	*/
460408ef SG	11
2dd90027	12	#ifndef USE_HOSTCC
460408ef SG	13	#include <common.h>
460408ef SG	14	#include <command.h>
bf007ebb	15	#include <malloc.h>
0eb25b61	16	#include <mapmem.h>
1f9c9280	17	#include <hw_sha.h>
2dd90027	18	#include <asm/io.h>
1221ce45	19	#include <linux/errno.h>
2dd90027 RG	20	#else
	21	#include "mkimage.h"
	22	#include <time.h>
	23	#include <image.h>
	24	#endif /* !USE_HOSTCC*/
	25
460408ef	26	#include <hash.h>
2dd90027	27	#include <u-boot/crc.h>
2b9912e6 JH	28	#include <u-boot/sha1.h>
2b9912e6 JH	29	#include <u-boot/sha256.h>
2dd90027	30	#include <u-boot/md5.h>
460408ef	31
78eda89e	32	#if defined(CONFIG_SHA1) && !defined(CONFIG_SHA_PROG_HW_ACCEL)
bf007ebb HT	33	static int hash_init_sha1(struct hash_algo algo, void *ctxp)
	34	{
	35	sha1_context *ctx = malloc(sizeof(sha1_context));
	36	sha1_starts(ctx);
	37	*ctxp = ctx;
	38	return 0;
	39	}
	40
	41	static int hash_update_sha1(struct hash_algo algo, void ctx, const void *buf,
	42	unsigned int size, int is_last)
	43	{
	44	sha1_update((sha1_context *)ctx, buf, size);
	45	return 0;
	46	}
	47
	48	static int hash_finish_sha1(struct hash_algo algo, void ctx, void *dest_buf,
	49	int size)
	50	{
	51	if (size < algo->digest_size)
	52	return -1;
	53
	54	sha1_finish((sha1_context *)ctx, dest_buf);
	55	free(ctx);
	56	return 0;
	57	}
	58	#endif
	59
78eda89e	60	#if defined(CONFIG_SHA256) && !defined(CONFIG_SHA_PROG_HW_ACCEL)
bf007ebb HT	61	static int hash_init_sha256(struct hash_algo algo, void *ctxp)
	62	{
	63	sha256_context *ctx = malloc(sizeof(sha256_context));
	64	sha256_starts(ctx);
	65	*ctxp = ctx;
	66	return 0;
	67	}
	68
	69	static int hash_update_sha256(struct hash_algo algo, void ctx,
	70	const void *buf, unsigned int size, int is_last)
	71	{
	72	sha256_update((sha256_context *)ctx, buf, size);
	73	return 0;
	74	}
	75
	76	static int hash_finish_sha256(struct hash_algo algo, void ctx, void
	77	*dest_buf, int size)
	78	{
	79	if (size < algo->digest_size)
	80	return -1;
	81
	82	sha256_finish((sha256_context *)ctx, dest_buf);
	83	free(ctx);
	84	return 0;
	85	}
	86	#endif
	87
	88	static int hash_init_crc32(struct hash_algo algo, void *ctxp)
	89	{
	90	uint32_t *ctx = malloc(sizeof(uint32_t));
	91	*ctx = 0;
	92	*ctxp = ctx;
	93	return 0;
	94	}
	95
	96	static int hash_update_crc32(struct hash_algo algo, void ctx,
	97	const void *buf, unsigned int size, int is_last)
	98	{
	99	((uint32_t )ctx) = crc32(((uint32_t )ctx), buf, size);
	100	return 0;
	101	}
	102
	103	static int hash_finish_crc32(struct hash_algo algo, void ctx, void *dest_buf,
	104	int size)
	105	{
	106	if (size < algo->digest_size)
	107	return -1;
	108
	109	((uint32_t )dest_buf) = ((uint32_t )ctx);
	110	free(ctx);
	111	return 0;
	112	}
	113
460408ef	114	/*
78eda89e TR	115	* These are the hash algorithms we support. If we have hardware acceleration
	116	* is enable we will use that, otherwise a software version of the algorithm.
	117	* Note that algorithm names must be in lower case.
460408ef SG	118	*/
460408ef SG	119	static struct hash_algo hash_algo[] = {
78eda89e	120	#ifdef CONFIG_SHA1
1f9c9280	121	{
78eda89e TR	122	.name = "sha1",
	123	.digest_size = SHA1_SUM_LEN,
	124	.chunk_size = CHUNKSZ_SHA1,
	125	#ifdef CONFIG_SHA_HW_ACCEL
	126	.hash_func_ws = hw_sha1,
	127	#else
	128	.hash_func_ws = sha1_csum_wd,
94e3c8c4	129	#endif
94e3c8c4	130	#ifdef CONFIG_SHA_PROG_HW_ACCEL
78eda89e TR	131	.hash_init = hw_sha_init,
	132	.hash_update = hw_sha_update,
	133	.hash_finish = hw_sha_finish,
	134	#else
	135	.hash_init = hash_init_sha1,
	136	.hash_update = hash_update_sha1,
	137	.hash_finish = hash_finish_sha1,
1f9c9280	138	#endif
460408ef SG	139	},
	140	#endif
	141	#ifdef CONFIG_SHA256
	142	{
78eda89e TR	143	.name = "sha256",
	144	.digest_size = SHA256_SUM_LEN,
	145	.chunk_size = CHUNKSZ_SHA256,
	146	#ifdef CONFIG_SHA_HW_ACCEL
	147	.hash_func_ws = hw_sha256,
	148	#else
	149	.hash_func_ws = sha256_csum_wd,
	150	#endif
	151	#ifdef CONFIG_SHA_PROG_HW_ACCEL
	152	.hash_init = hw_sha_init,
	153	.hash_update = hw_sha_update,
	154	.hash_finish = hw_sha_finish,
	155	#else
	156	.hash_init = hash_init_sha256,
	157	.hash_update = hash_update_sha256,
	158	.hash_finish = hash_finish_sha256,
	159	#endif
460408ef SG	160	},
460408ef SG	161	#endif
d20a40de	162	{
78eda89e TR	163	.name = "crc32",
	164	.digest_size = 4,
	165	.chunk_size = CHUNKSZ_CRC32,
	166	.hash_func_ws = crc32_wd_buf,
	167	.hash_init = hash_init_crc32,
	168	.hash_update = hash_update_crc32,
	169	.hash_finish = hash_finish_crc32,
d20a40de	170	},
460408ef SG	171	};
460408ef SG	172
d20a40de	173	/* Try to minimize code size for boards that don't want much hashing */
221a949e DT	174	#if defined(CONFIG_SHA256) \|\| defined(CONFIG_CMD_SHA1SUM) \|\| \
221a949e DT	175	defined(CONFIG_CRC32_VERIFY) \|\| defined(CONFIG_CMD_HASH)
d20a40de SG	176	#define multi_hash() 1
	177	#else
	178	#define multi_hash() 0
	179	#endif
	180
2dd90027 RG	181	int hash_lookup_algo(const char algo_name, struct hash_algo *algop)
	182	{
	183	int i;
	184
	185	for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
	186	if (!strcmp(algo_name, hash_algo[i].name)) {
	187	*algop = &hash_algo[i];
	188	return 0;
	189	}
	190	}
	191
	192	debug("Unknown hash algorithm '%s'\n", algo_name);
	193	return -EPROTONOSUPPORT;
	194	}
	195
	196	int hash_progressive_lookup_algo(const char *algo_name,
	197	struct hash_algo **algop)
	198	{
	199	int i;
	200
	201	for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
	202	if (!strcmp(algo_name, hash_algo[i].name)) {
	203	if (hash_algo[i].hash_init) {
	204	*algop = &hash_algo[i];
	205	return 0;
	206	}
	207	}
	208	}
	209
	210	debug("Unknown hash algorithm '%s'\n", algo_name);
	211	return -EPROTONOSUPPORT;
	212	}
	213
	214	#ifndef USE_HOSTCC
8f0b1e24 SR	215	int hash_parse_string(const char algo_name, const char str, uint8_t *result)
	216	{
	217	struct hash_algo *algo;
	218	int ret;
	219	int i;
	220
	221	ret = hash_lookup_algo(algo_name, &algo);
	222	if (ret)
	223	return ret;
	224
	225	for (i = 0; i < algo->digest_size; i++) {
	226	char chr[3];
	227
	228	strncpy(chr, &str[i * 2], 2);
	229	result[i] = simple_strtoul(chr, NULL, 16);
	230	}
	231
	232	return 0;
	233	}
	234
48ad68de TR	235	int hash_block(const char algo_name, const void data, unsigned int len,
	236	uint8_t output, int output_size)
	237	{
	238	struct hash_algo *algo;
	239	int ret;
	240
	241	ret = hash_lookup_algo(algo_name, &algo);
	242	if (ret)
	243	return ret;
	244
	245	if (output_size && *output_size < algo->digest_size) {
	246	debug("Output buffer size %d too small (need %d bytes)",
	247	*output_size, algo->digest_size);
	248	return -ENOSPC;
	249	}
	250	if (output_size)
	251	*output_size = algo->digest_size;
	252	algo->hash_func_ws(data, len, output, algo->chunk_size);
	253
	254	return 0;
	255	}
	256
	257	#if defined(CONFIG_CMD_HASH) \|\| defined(CONFIG_CMD_SHA1SUM) \|\| defined(CONFIG_CMD_CRC32)
460408ef SG	258	/**
	259	* store_result: Store the resulting sum to an address or variable
	260	*
	261	* @algo: Hash algorithm being used
	262	* @sum: Hash digest (algo->digest_size bytes)
	263	* @dest: Destination, interpreted as a hex address if it starts
d5b76673 SG	264	* with * (or allow_env_vars is 0) or otherwise as an
	265	* environment variable.
	266	* @allow_env_vars: non-zero to permit storing the result to an
	267	* variable environment
460408ef	268	*/
04819a4f	269	static void store_result(struct hash_algo algo, const uint8_t sum,
d5b76673	270	const char *dest, int allow_env_vars)
460408ef SG	271	{
460408ef SG	272	unsigned int i;
d5b76673	273	int env_var = 0;
460408ef	274
d5b76673 SG	275	/*
	276	* If environment variables are allowed, then we assume that 'dest'
	277	* is an environment variable, unless it starts with *, in which
	278	* case we assume it is an address. If not allowed, it is always an
	279	* address. This is to support the crc32 command.
	280	*/
	281	if (allow_env_vars) {
	282	if (dest == '')
	283	dest++;
	284	else
	285	env_var = 1;
	286	}
460408ef	287
d5b76673	288	if (env_var) {
460408ef SG	289	char str_output[HASH_MAX_DIGEST_SIZE * 2 + 1];
	290	char *str_ptr = str_output;
	291
	292	for (i = 0; i < algo->digest_size; i++) {
	293	sprintf(str_ptr, "%02x", sum[i]);
	294	str_ptr += 2;
	295	}
8b9cc866	296	*str_ptr = '\0';
382bee57	297	env_set(dest, str_output);
d5b76673	298	} else {
bd091b67 SG	299	ulong addr;
bd091b67 SG	300	void *buf;
d5b76673	301
bd091b67 SG	302	addr = simple_strtoul(dest, NULL, 16);
	303	buf = map_sysmem(addr, algo->digest_size);
	304	memcpy(buf, sum, algo->digest_size);
	305	unmap_sysmem(buf);
460408ef SG	306	}
	307	}
	308
	309	/**
	310	* parse_verify_sum: Parse a hash verification parameter
	311	*
	312	* @algo: Hash algorithm being used
	313	* @verify_str: Argument to parse. If it starts with * then it is
	314	* interpreted as a hex address containing the hash.
	315	* If the length is exactly the right number of hex digits
	316	* for the digest size, then we assume it is a hex digest.
	317	* Otherwise we assume it is an environment variable, and
	318	* look up its value (it must contain a hex digest).
	319	* @vsum: Returns binary digest value (algo->digest_size bytes)
d5b76673 SG	320	* @allow_env_vars: non-zero to permit storing the result to an environment
	321	* variable. If 0 then verify_str is assumed to be an
	322	* address, and the * prefix is not expected.
460408ef SG	323	* @return 0 if ok, non-zero on error
460408ef SG	324	*/
04819a4f SG	325	static int parse_verify_sum(struct hash_algo algo, char verify_str,
04819a4f SG	326	uint8_t *vsum, int allow_env_vars)
460408ef	327	{
d5b76673 SG	328	int env_var = 0;
	329
	330	/* See comment above in store_result() */
	331	if (allow_env_vars) {
	332	if (verify_str == '')
	333	verify_str++;
	334	else
	335	env_var = 1;
	336	}
	337
3ef46a99	338	if (!env_var) {
bd091b67 SG	339	ulong addr;
bd091b67 SG	340	void *buf;
460408ef	341
bd091b67 SG	342	addr = simple_strtoul(verify_str, NULL, 16);
	343	buf = map_sysmem(addr, algo->digest_size);
	344	memcpy(vsum, buf, algo->digest_size);
460408ef	345	} else {
460408ef SG	346	char *vsum_str;
	347	int digits = algo->digest_size * 2;
	348
	349	/*
	350	* As with the original code from sha1sum.c, we assume that a
	351	* string which matches the digest size exactly is a hex
	352	* string and not an environment variable.
	353	*/
	354	if (strlen(verify_str) == digits)
	355	vsum_str = verify_str;
	356	else {
00caae6d	357	vsum_str = env_get(verify_str);
460408ef SG	358	if (vsum_str == NULL \|\| strlen(vsum_str) != digits) {
	359	printf("Expected %d hex digits in env var\n",
	360	digits);
	361	return 1;
	362	}
	363	}
	364
8f0b1e24	365	hash_parse_string(algo->name, vsum_str, vsum);
460408ef SG	366	}
	367	return 0;
	368	}
	369
48ad68de	370	static void hash_show(struct hash_algo algo, ulong addr, ulong len, uint8_t output)
460408ef SG	371	{
	372	int i;
	373
	374	printf("%s for %08lx ... %08lx ==> ", algo->name, addr, addr + len - 1);
	375	for (i = 0; i < algo->digest_size; i++)
	376	printf("%02x", output[i]);
	377	}
	378
d5b76673	379	int hash_command(const char algo_name, int flags, cmd_tbl_t cmdtp, int flag,
460408ef SG	380	int argc, char * const argv[])
460408ef SG	381	{
460408ef	382	ulong addr, len;
460408ef	383
3ef46a99	384	if ((argc < 2) \|\| ((flags & HASH_FLAG_VERIFY) && (argc < 3)))
460408ef SG	385	return CMD_RET_USAGE;
460408ef SG	386
d5b76673 SG	387	addr = simple_strtoul(*argv++, NULL, 16);
	388	len = simple_strtoul(*argv++, NULL, 16);
	389
d20a40de SG	390	if (multi_hash()) {
d20a40de SG	391	struct hash_algo *algo;
d7af2baa	392	u8 *output;
04819a4f	393	uint8_t vsum[HASH_MAX_DIGEST_SIZE];
bd091b67	394	void *buf;
460408ef	395
bf007ebb	396	if (hash_lookup_algo(algo_name, &algo)) {
d20a40de SG	397	printf("Unknown hash algorithm '%s'\n", algo_name);
	398	return CMD_RET_USAGE;
	399	}
	400	argc -= 2;
	401
	402	if (algo->digest_size > HASH_MAX_DIGEST_SIZE) {
	403	puts("HASH_MAX_DIGEST_SIZE exceeded\n");
	404	return 1;
	405	}
460408ef	406
d7af2baa BL	407	output = memalign(ARCH_DMA_MINALIGN,
	408	sizeof(uint32_t) * HASH_MAX_DIGEST_SIZE);
	409
bd091b67 SG	410	buf = map_sysmem(addr, len);
	411	algo->hash_func_ws(buf, len, output, algo->chunk_size);
	412	unmap_sysmem(buf);
460408ef	413
d20a40de	414	/* Try to avoid code bloat when verify is not needed */
221a949e DT	415	#if defined(CONFIG_CRC32_VERIFY) \|\| defined(CONFIG_SHA1SUM_VERIFY) \|\| \
221a949e DT	416	defined(CONFIG_HASH_VERIFY)
d20a40de	417	if (flags & HASH_FLAG_VERIFY) {
460408ef	418	#else
d20a40de	419	if (0) {
460408ef	420	#endif
d20a40de	421	if (parse_verify_sum(algo, *argv, vsum,
d5b76673	422	flags & HASH_FLAG_ENV)) {
d20a40de SG	423	printf("ERROR: %s does not contain a valid "
	424	"%s sum\n", *argv, algo->name);
	425	return 1;
	426	}
	427	if (memcmp(output, vsum, algo->digest_size) != 0) {
	428	int i;
460408ef	429
31890ae2	430	hash_show(algo, addr, len, output);
d20a40de SG	431	printf(" != ");
	432	for (i = 0; i < algo->digest_size; i++)
	433	printf("%02x", vsum[i]);
	434	puts(" ERROR \n");
	435	return 1;
	436	}
	437	} else {
31890ae2	438	hash_show(algo, addr, len, output);
d20a40de SG	439	printf("\n");
	440
	441	if (argc) {
	442	store_result(algo, output, *argv,
	443	flags & HASH_FLAG_ENV);
	444	}
d7af2baa BL	445	unmap_sysmem(output);
d7af2baa BL	446
460408ef	447	}
d20a40de SG	448
d20a40de SG	449	/* Horrible code size hack for boards that just want crc32 */
460408ef	450	} else {
d20a40de SG	451	ulong crc;
	452	ulong *ptr;
	453
	454	crc = crc32_wd(0, (const uchar *)addr, len, CHUNKSZ_CRC32);
	455
	456	printf("CRC32 for %08lx ... %08lx ==> %08lx\n",
	457	addr, addr + len - 1, crc);
460408ef	458
4b756b01 TR	459	if (argc >= 3) {
4b756b01 TR	460	ptr = (ulong *)simple_strtoul(argv[0], NULL, 16);
d20a40de	461	*ptr = crc;
d5b76673	462	}
460408ef SG	463	}
	464
	465	return 0;
	466	}
d70f919e SG	467	#endif /* CONFIG_CMD_HASH \|\| CONFIG_CMD_SHA1SUM \|\| CONFIG_CMD_CRC32) */
d70f919e SG	468	#endif /* !USE_HOSTCC */