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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
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@@ -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[])
{