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hash: Add a way to calculate a hash for any algortihm

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Rather than needing to call one of many hashing algorithms in U-Boot,
provide a function hash_block() which handles this, and can support all
available hash algorithms.

Once we have md5 supported within hashing, we can use this function in
the FIT image code.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2013-05-07 06:11:47 +00:00 committed by Tom Rini
parent 134a65124d
commit 6f907b422e
2 changed files with 45 additions and 0 deletions
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23
common/hash.c
View File

@ -30,6 +30,7 @@
#include <sha1.h>
#include <sha256.h>
#include <asm/io.h>
#include <asm/errno.h>
/*
* These are the hash algorithms we support. Chips which support accelerated
@ -238,6 +239,28 @@ static void show_hash(struct hash_algo *algo, ulong addr, ulong len,
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;
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);
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[])
{

22
include/hash.h
View File

@ -71,4 +71,26 @@ enum {
int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
int argc, char * const argv[]);
/**
* hash_block() - Hash a block according to the requested algorithm
*
* The caller probably knows the hash length for the chosen algorithm, but
* in order to provide a general interface, and output_size parameter is
* provided.
*
* @algo_name: Hash algorithm to use
* @data: Data to hash
* @len: Lengh of data to hash in bytes
* @output: Place to put hash value
* @output_size: On entry, pointer to the number of bytes available in
* output. On exit, pointer to the number of bytes used.
* If NULL, then it is assumed that the caller has
* allocated enough space for the hash. This is possible
* since the caller is selecting the algorithm.
* @return 0 if ok, -ve on error: -EPROTONOSUPPORT for an unknown algorithm,
* -ENOSPC if the output buffer is not large enough.
*/
int hash_block(const char *algo_name, const void *data, unsigned int len,
uint8_t *output, int *output_size);
#endif