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gen: Add progressive hash API

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Add hash_init(), hash_update() and hash_finish() to the
hash_algo struct. Add hash_lookup_algo() to look up the
struct given an algorithm name.

Signed-off-by: Hung-ying Tyan <tyanh@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Heiko Schocher <hs@denx.de>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Hung-ying Tyan 2014-03-03 12:19:28 +01:00 committed by Tom Rini
parent db1b5f3d20
commit bf007ebb6f
2 changed files with 153 additions and 11 deletions
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116
common/hash.c
View File

@ -12,6 +12,7 @@
#include <common.h>
#include <command.h>
#include <malloc.h>
#include <hw_sha.h>
#include <hash.h>
#include <sha1.h>
@ -19,6 +20,88 @@
#include <asm/io.h>
#include <asm/errno.h>
#ifdef CONFIG_CMD_SHA1SUM
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
@ -53,6 +136,9 @@ static struct hash_algo hash_algo[] = {
SHA1_SUM_LEN,
sha1_csum_wd,
CHUNKSZ_SHA1,
hash_init_sha1,
hash_update_sha1,
hash_finish_sha1,
},
#define MULTI_HASH
#endif
@ -62,6 +148,9 @@ static struct hash_algo hash_algo[] = {
SHA256_SUM_LEN,
sha256_csum_wd,
CHUNKSZ_SHA256,
hash_init_sha256,
hash_update_sha256,
hash_finish_sha256,
},
#define MULTI_HASH
#endif
@ -70,6 +159,9 @@ static struct hash_algo hash_algo[] = {
4,
crc32_wd_buf,
CHUNKSZ_CRC32,
hash_init_crc32,
hash_update_crc32,
hash_finish_crc32,
},
};
@ -204,16 +296,19 @@ static int parse_verify_sum(struct hash_algo *algo, char *verify_str, u8 *vsum,
return 0;
}
static struct hash_algo *find_hash_algo(const char *name)
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(name, hash_algo[i].name))
return &hash_algo[i];
if (!strcmp(algo_name, hash_algo[i].name)) {
*algop = &hash_algo[i];
return 0;
}
}
return NULL;
debug("Unknown hash algorithm '%s'\n", algo_name);
return -EPROTONOSUPPORT;
}
static void show_hash(struct hash_algo *algo, ulong addr, ulong len,
@ -230,12 +325,12 @@ 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;
algo = find_hash_algo(algo_name);
if (!algo) {
debug("Unknown hash algorithm '%s'\n", algo_name);
return -EPROTONOSUPPORT;
}
if (output_size && *output_size < algo->digest_size) {
debug("Output buffer size %d too small (need %d bytes)",
*output_size, algo->digest_size);
@ -265,8 +360,7 @@ int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
u8 vsum[HASH_MAX_DIGEST_SIZE];
void *buf;
algo = find_hash_algo(algo_name);
if (!algo) {
if (hash_lookup_algo(algo_name, &algo)) {
printf("Unknown hash algorithm '%s'\n", algo_name);
return CMD_RET_USAGE;
}

48
include/hash.h
View File

@ -27,6 +27,42 @@ struct hash_algo {
void (*hash_func_ws)(const unsigned char *input, unsigned int ilen,
unsigned char *output, unsigned int chunk_sz);
int chunk_size; /* Watchdog chunk size */
/*
* hash_init: Create the context for progressive hashing
*
* @algo: Pointer to the hash_algo struct
* @ctxp: Pointer to the pointer of the context for hashing
* @return 0 if ok, -1 on error
*/
int (*hash_init)(struct hash_algo *algo, void **ctxp);
/*
* hash_update: Perform hashing on the given buffer
*
* The context is freed by this function if an error occurs.
*
* @algo: Pointer to the hash_algo struct
* @ctx: Pointer to the context for hashing
* @buf: Pointer to the buffer being hashed
* @size: Size of the buffer being hashed
* @is_last: 1 if this is the last update; 0 otherwise
* @return 0 if ok, -1 on error
*/
int (*hash_update)(struct hash_algo *algo, void *ctx, const void *buf,
unsigned int size, int is_last);
/*
* hash_finish: Write the hash result to the given buffer
*
* The context is freed by this function.
*
* @algo: Pointer to the hash_algo struct
* @ctx: Pointer to the context for hashing
* @dest_buf: Pointer to the buffer for the result
* @size: Size of the buffer for the result
* @return 0 if ok, -ENOSPC if size of the result buffer is too small
* or -1 on other errors
*/
int (*hash_finish)(struct hash_algo *algo, void *ctx, void *dest_buf,
int size);
};
/*
@ -77,4 +113,16 @@ int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
int hash_block(const char *algo_name, const void *data, unsigned int len,
uint8_t *output, int *output_size);
/**
* hash_lookup_algo() - Look up the hash_algo struct for an algorithm
*
* The function returns the pointer to the struct or -EPROTONOSUPPORT if the
* algorithm is not available.
*
* @algo_name: Hash algorithm to look up
* @algop: Pointer to the hash_algo struct if found
*
* @return 0 if ok, -EPROTONOSUPPORT for an unknown algorithm.
*/
int hash_lookup_algo(const char *algo_name, struct hash_algo **algop);
#endif