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

/*
 * 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 <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
460408ef SG	1	/*
	2	* Copyright (c) 2012 The Chromium OS Authors.
	3	*
	4	* (C) Copyright 2011
	5	* Joe Hershberger, National Instruments, joe.hershberger@ni.com
	6	*
	7	* (C) Copyright 2000
	8	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	9	*
1a459660	10	* SPDX-License-Identifier: GPL-2.0+
460408ef SG	11	*/
460408ef SG	12
2dd90027	13	#ifndef USE_HOSTCC
460408ef SG	14	#include <common.h>
460408ef SG	15	#include <command.h>
bf007ebb	16	#include <malloc.h>
0eb25b61	17	#include <mapmem.h>
1f9c9280	18	#include <hw_sha.h>
2dd90027	19	#include <asm/io.h>
1221ce45	20	#include <linux/errno.h>
2dd90027 RG	21	#else
	22	#include "mkimage.h"
	23	#include <time.h>
	24	#include <image.h>
	25	#endif /* !USE_HOSTCC*/
	26
460408ef	27	#include <hash.h>
2dd90027	28	#include <u-boot/crc.h>
2b9912e6 JH	29	#include <u-boot/sha1.h>
2b9912e6 JH	30	#include <u-boot/sha256.h>
2dd90027	31	#include <u-boot/md5.h>
460408ef	32
78eda89e	33	#if defined(CONFIG_SHA1) && !defined(CONFIG_SHA_PROG_HW_ACCEL)
bf007ebb HT	34	static int hash_init_sha1(struct hash_algo algo, void *ctxp)
	35	{
	36	sha1_context *ctx = malloc(sizeof(sha1_context));
	37	sha1_starts(ctx);
	38	*ctxp = ctx;
	39	return 0;
	40	}
	41
	42	static int hash_update_sha1(struct hash_algo algo, void ctx, const void *buf,
	43	unsigned int size, int is_last)
	44	{
	45	sha1_update((sha1_context *)ctx, buf, size);
	46	return 0;
	47	}
	48
	49	static int hash_finish_sha1(struct hash_algo algo, void ctx, void *dest_buf,
	50	int size)
	51	{
	52	if (size < algo->digest_size)
	53	return -1;
	54
	55	sha1_finish((sha1_context *)ctx, dest_buf);
	56	free(ctx);
	57	return 0;
	58	}
	59	#endif
	60
78eda89e	61	#if defined(CONFIG_SHA256) && !defined(CONFIG_SHA_PROG_HW_ACCEL)
bf007ebb HT	62	static int hash_init_sha256(struct hash_algo algo, void *ctxp)
	63	{
	64	sha256_context *ctx = malloc(sizeof(sha256_context));
	65	sha256_starts(ctx);
	66	*ctxp = ctx;
	67	return 0;
	68	}
	69
	70	static int hash_update_sha256(struct hash_algo algo, void ctx,
	71	const void *buf, unsigned int size, int is_last)
	72	{
	73	sha256_update((sha256_context *)ctx, buf, size);
	74	return 0;
	75	}
	76
	77	static int hash_finish_sha256(struct hash_algo algo, void ctx, void
	78	*dest_buf, int size)
	79	{
	80	if (size < algo->digest_size)
	81	return -1;
	82
	83	sha256_finish((sha256_context *)ctx, dest_buf);
	84	free(ctx);
	85	return 0;
	86	}
	87	#endif
	88
	89	static int hash_init_crc32(struct hash_algo algo, void *ctxp)
	90	{
	91	uint32_t *ctx = malloc(sizeof(uint32_t));
	92	*ctx = 0;
	93	*ctxp = ctx;
	94	return 0;
	95	}
	96
	97	static int hash_update_crc32(struct hash_algo algo, void ctx,
	98	const void *buf, unsigned int size, int is_last)
	99	{
	100	((uint32_t )ctx) = crc32(((uint32_t )ctx), buf, size);
	101	return 0;
	102	}
	103
	104	static int hash_finish_crc32(struct hash_algo algo, void ctx, void *dest_buf,
	105	int size)
	106	{
	107	if (size < algo->digest_size)
	108	return -1;
	109
	110	((uint32_t )dest_buf) = ((uint32_t )ctx);
	111	free(ctx);
	112	return 0;
	113	}
	114
460408ef	115	/*
78eda89e TR	116	* These are the hash algorithms we support. If we have hardware acceleration
	117	* is enable we will use that, otherwise a software version of the algorithm.
	118	* Note that algorithm names must be in lower case.
460408ef SG	119	*/
460408ef SG	120	static struct hash_algo hash_algo[] = {
78eda89e	121	#ifdef CONFIG_SHA1
1f9c9280	122	{
78eda89e TR	123	.name = "sha1",
	124	.digest_size = SHA1_SUM_LEN,
	125	.chunk_size = CHUNKSZ_SHA1,
	126	#ifdef CONFIG_SHA_HW_ACCEL
	127	.hash_func_ws = hw_sha1,
	128	#else
	129	.hash_func_ws = sha1_csum_wd,
94e3c8c4	130	#endif
94e3c8c4	131	#ifdef CONFIG_SHA_PROG_HW_ACCEL
78eda89e TR	132	.hash_init = hw_sha_init,
	133	.hash_update = hw_sha_update,
	134	.hash_finish = hw_sha_finish,
	135	#else
	136	.hash_init = hash_init_sha1,
	137	.hash_update = hash_update_sha1,
	138	.hash_finish = hash_finish_sha1,
1f9c9280	139	#endif
460408ef SG	140	},
	141	#endif
	142	#ifdef CONFIG_SHA256
	143	{
78eda89e TR	144	.name = "sha256",
	145	.digest_size = SHA256_SUM_LEN,
	146	.chunk_size = CHUNKSZ_SHA256,
	147	#ifdef CONFIG_SHA_HW_ACCEL
	148	.hash_func_ws = hw_sha256,
	149	#else
	150	.hash_func_ws = sha256_csum_wd,
	151	#endif
	152	#ifdef CONFIG_SHA_PROG_HW_ACCEL
	153	.hash_init = hw_sha_init,
	154	.hash_update = hw_sha_update,
	155	.hash_finish = hw_sha_finish,
	156	#else
	157	.hash_init = hash_init_sha256,
	158	.hash_update = hash_update_sha256,
	159	.hash_finish = hash_finish_sha256,
	160	#endif
460408ef SG	161	},
460408ef SG	162	#endif
d20a40de	163	{
78eda89e TR	164	.name = "crc32",
	165	.digest_size = 4,
	166	.chunk_size = CHUNKSZ_CRC32,
	167	.hash_func_ws = crc32_wd_buf,
	168	.hash_init = hash_init_crc32,
	169	.hash_update = hash_update_crc32,
	170	.hash_finish = hash_finish_crc32,
d20a40de	171	},
460408ef SG	172	};
460408ef SG	173
d20a40de	174	/* Try to minimize code size for boards that don't want much hashing */
221a949e DT	175	#if defined(CONFIG_SHA256) \|\| defined(CONFIG_CMD_SHA1SUM) \|\| \
221a949e DT	176	defined(CONFIG_CRC32_VERIFY) \|\| defined(CONFIG_CMD_HASH)
d20a40de SG	177	#define multi_hash() 1
	178	#else
	179	#define multi_hash() 0
	180	#endif
	181
2dd90027 RG	182	int hash_lookup_algo(const char algo_name, struct hash_algo *algop)
	183	{
	184	int i;
	185
	186	for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
	187	if (!strcmp(algo_name, hash_algo[i].name)) {
	188	*algop = &hash_algo[i];
	189	return 0;
	190	}
	191	}
	192
	193	debug("Unknown hash algorithm '%s'\n", algo_name);
	194	return -EPROTONOSUPPORT;
	195	}
	196
	197	int hash_progressive_lookup_algo(const char *algo_name,
	198	struct hash_algo **algop)
	199	{
	200	int i;
	201
	202	for (i = 0; i < ARRAY_SIZE(hash_algo); i++) {
	203	if (!strcmp(algo_name, hash_algo[i].name)) {
	204	if (hash_algo[i].hash_init) {
	205	*algop = &hash_algo[i];
	206	return 0;
	207	}
	208	}
	209	}
	210
	211	debug("Unknown hash algorithm '%s'\n", algo_name);
	212	return -EPROTONOSUPPORT;
	213	}
	214
	215	#ifndef USE_HOSTCC
8f0b1e24 SR	216	int hash_parse_string(const char algo_name, const char str, uint8_t *result)
	217	{
	218	struct hash_algo *algo;
	219	int ret;
	220	int i;
	221
	222	ret = hash_lookup_algo(algo_name, &algo);
	223	if (ret)
	224	return ret;
	225
	226	for (i = 0; i < algo->digest_size; i++) {
	227	char chr[3];
	228
	229	strncpy(chr, &str[i * 2], 2);
	230	result[i] = simple_strtoul(chr, NULL, 16);
	231	}
	232
	233	return 0;
	234	}
	235
48ad68de TR	236	int hash_block(const char algo_name, const void data, unsigned int len,
	237	uint8_t output, int output_size)
	238	{
	239	struct hash_algo *algo;
	240	int ret;
	241
	242	ret = hash_lookup_algo(algo_name, &algo);
	243	if (ret)
	244	return ret;
	245
	246	if (output_size && *output_size < algo->digest_size) {
	247	debug("Output buffer size %d too small (need %d bytes)",
	248	*output_size, algo->digest_size);
	249	return -ENOSPC;
	250	}
	251	if (output_size)
	252	*output_size = algo->digest_size;
	253	algo->hash_func_ws(data, len, output, algo->chunk_size);
	254
	255	return 0;
	256	}
	257
	258	#if defined(CONFIG_CMD_HASH) \|\| defined(CONFIG_CMD_SHA1SUM) \|\| defined(CONFIG_CMD_CRC32)
460408ef SG	259	/**
	260	* store_result: Store the resulting sum to an address or variable
	261	*
	262	* @algo: Hash algorithm being used
	263	* @sum: Hash digest (algo->digest_size bytes)
	264	* @dest: Destination, interpreted as a hex address if it starts
d5b76673 SG	265	* with * (or allow_env_vars is 0) or otherwise as an
	266	* environment variable.
	267	* @allow_env_vars: non-zero to permit storing the result to an
	268	* variable environment
460408ef	269	*/
04819a4f	270	static void store_result(struct hash_algo algo, const uint8_t sum,
d5b76673	271	const char *dest, int allow_env_vars)
460408ef SG	272	{
460408ef SG	273	unsigned int i;
d5b76673	274	int env_var = 0;
460408ef	275
d5b76673 SG	276	/*
	277	* If environment variables are allowed, then we assume that 'dest'
	278	* is an environment variable, unless it starts with *, in which
	279	* case we assume it is an address. If not allowed, it is always an
	280	* address. This is to support the crc32 command.
	281	*/
	282	if (allow_env_vars) {
	283	if (dest == '')
	284	dest++;
	285	else
	286	env_var = 1;
	287	}
460408ef	288
d5b76673	289	if (env_var) {
460408ef SG	290	char str_output[HASH_MAX_DIGEST_SIZE * 2 + 1];
	291	char *str_ptr = str_output;
	292
	293	for (i = 0; i < algo->digest_size; i++) {
	294	sprintf(str_ptr, "%02x", sum[i]);
	295	str_ptr += 2;
	296	}
8b9cc866	297	*str_ptr = '\0';
382bee57	298	env_set(dest, str_output);
d5b76673	299	} else {
bd091b67 SG	300	ulong addr;
bd091b67 SG	301	void *buf;
d5b76673	302
bd091b67 SG	303	addr = simple_strtoul(dest, NULL, 16);
	304	buf = map_sysmem(addr, algo->digest_size);
	305	memcpy(buf, sum, algo->digest_size);
	306	unmap_sysmem(buf);
460408ef SG	307	}
	308	}
	309
	310	/**
	311	* parse_verify_sum: Parse a hash verification parameter
	312	*
	313	* @algo: Hash algorithm being used
	314	* @verify_str: Argument to parse. If it starts with * then it is
	315	* interpreted as a hex address containing the hash.
	316	* If the length is exactly the right number of hex digits
	317	* for the digest size, then we assume it is a hex digest.
	318	* Otherwise we assume it is an environment variable, and
	319	* look up its value (it must contain a hex digest).
	320	* @vsum: Returns binary digest value (algo->digest_size bytes)
d5b76673 SG	321	* @allow_env_vars: non-zero to permit storing the result to an environment
	322	* variable. If 0 then verify_str is assumed to be an
	323	* address, and the * prefix is not expected.
460408ef SG	324	* @return 0 if ok, non-zero on error
460408ef SG	325	*/
04819a4f SG	326	static int parse_verify_sum(struct hash_algo algo, char verify_str,
04819a4f SG	327	uint8_t *vsum, int allow_env_vars)
460408ef	328	{
d5b76673 SG	329	int env_var = 0;
	330
	331	/* See comment above in store_result() */
	332	if (allow_env_vars) {
	333	if (verify_str == '')
	334	verify_str++;
	335	else
	336	env_var = 1;
	337	}
	338
3ef46a99	339	if (!env_var) {
bd091b67 SG	340	ulong addr;
bd091b67 SG	341	void *buf;
460408ef	342
bd091b67 SG	343	addr = simple_strtoul(verify_str, NULL, 16);
	344	buf = map_sysmem(addr, algo->digest_size);
	345	memcpy(vsum, buf, algo->digest_size);
460408ef	346	} else {
460408ef SG	347	char *vsum_str;
	348	int digits = algo->digest_size * 2;
	349
	350	/*
	351	* As with the original code from sha1sum.c, we assume that a
	352	* string which matches the digest size exactly is a hex
	353	* string and not an environment variable.
	354	*/
	355	if (strlen(verify_str) == digits)
	356	vsum_str = verify_str;
	357	else {
00caae6d	358	vsum_str = env_get(verify_str);
460408ef SG	359	if (vsum_str == NULL \|\| strlen(vsum_str) != digits) {
	360	printf("Expected %d hex digits in env var\n",
	361	digits);
	362	return 1;
	363	}
	364	}
	365
8f0b1e24	366	hash_parse_string(algo->name, vsum_str, vsum);
460408ef SG	367	}
	368	return 0;
	369	}
	370
48ad68de	371	static void hash_show(struct hash_algo algo, ulong addr, ulong len, uint8_t output)
460408ef SG	372	{
	373	int i;
	374
	375	printf("%s for %08lx ... %08lx ==> ", algo->name, addr, addr + len - 1);
	376	for (i = 0; i < algo->digest_size; i++)
	377	printf("%02x", output[i]);
	378	}
	379
d5b76673	380	int hash_command(const char algo_name, int flags, cmd_tbl_t cmdtp, int flag,
460408ef SG	381	int argc, char * const argv[])
460408ef SG	382	{
460408ef	383	ulong addr, len;
460408ef	384
3ef46a99	385	if ((argc < 2) \|\| ((flags & HASH_FLAG_VERIFY) && (argc < 3)))
460408ef SG	386	return CMD_RET_USAGE;
460408ef SG	387
d5b76673 SG	388	addr = simple_strtoul(*argv++, NULL, 16);
	389	len = simple_strtoul(*argv++, NULL, 16);
	390
d20a40de SG	391	if (multi_hash()) {
d20a40de SG	392	struct hash_algo *algo;
d7af2baa	393	u8 *output;
04819a4f	394	uint8_t vsum[HASH_MAX_DIGEST_SIZE];
bd091b67	395	void *buf;
460408ef	396
bf007ebb	397	if (hash_lookup_algo(algo_name, &algo)) {
d20a40de SG	398	printf("Unknown hash algorithm '%s'\n", algo_name);
	399	return CMD_RET_USAGE;
	400	}
	401	argc -= 2;
	402
	403	if (algo->digest_size > HASH_MAX_DIGEST_SIZE) {
	404	puts("HASH_MAX_DIGEST_SIZE exceeded\n");
	405	return 1;
	406	}
460408ef	407
d7af2baa BL	408	output = memalign(ARCH_DMA_MINALIGN,
	409	sizeof(uint32_t) * HASH_MAX_DIGEST_SIZE);
	410
bd091b67 SG	411	buf = map_sysmem(addr, len);
	412	algo->hash_func_ws(buf, len, output, algo->chunk_size);
	413	unmap_sysmem(buf);
460408ef	414
d20a40de	415	/* Try to avoid code bloat when verify is not needed */
221a949e DT	416	#if defined(CONFIG_CRC32_VERIFY) \|\| defined(CONFIG_SHA1SUM_VERIFY) \|\| \
221a949e DT	417	defined(CONFIG_HASH_VERIFY)
d20a40de	418	if (flags & HASH_FLAG_VERIFY) {
460408ef	419	#else
d20a40de	420	if (0) {
460408ef	421	#endif
d20a40de	422	if (parse_verify_sum(algo, *argv, vsum,
d5b76673	423	flags & HASH_FLAG_ENV)) {
d20a40de SG	424	printf("ERROR: %s does not contain a valid "
	425	"%s sum\n", *argv, algo->name);
	426	return 1;
	427	}
	428	if (memcmp(output, vsum, algo->digest_size) != 0) {
	429	int i;
460408ef	430
31890ae2	431	hash_show(algo, addr, len, output);
d20a40de SG	432	printf(" != ");
	433	for (i = 0; i < algo->digest_size; i++)
	434	printf("%02x", vsum[i]);
	435	puts(" ERROR \n");
	436	return 1;
	437	}
	438	} else {
31890ae2	439	hash_show(algo, addr, len, output);
d20a40de SG	440	printf("\n");
	441
	442	if (argc) {
	443	store_result(algo, output, *argv,
	444	flags & HASH_FLAG_ENV);
	445	}
d7af2baa BL	446	unmap_sysmem(output);
d7af2baa BL	447
460408ef	448	}
d20a40de SG	449
d20a40de SG	450	/* Horrible code size hack for boards that just want crc32 */
460408ef	451	} else {
d20a40de SG	452	ulong crc;
	453	ulong *ptr;
	454
	455	crc = crc32_wd(0, (const uchar *)addr, len, CHUNKSZ_CRC32);
	456
	457	printf("CRC32 for %08lx ... %08lx ==> %08lx\n",
	458	addr, addr + len - 1, crc);
460408ef	459
4b756b01 TR	460	if (argc >= 3) {
4b756b01 TR	461	ptr = (ulong *)simple_strtoul(argv[0], NULL, 16);
d20a40de	462	*ptr = crc;
d5b76673	463	}
460408ef SG	464	}
	465
	466	return 0;
	467	}
d70f919e SG	468	#endif /* CONFIG_CMD_HASH \|\| CONFIG_CMD_SHA1SUM \|\| CONFIG_CMD_CRC32) */
d70f919e SG	469	#endif /* !USE_HOSTCC */