diff options
| author | Simon Glass <sjg@chromium.org> | 2013-05-07 06:11:47 +0000 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2013-05-14 15:37:24 -0400 |
| commit | 6f907b422e8f33a388ce66479da9f42c998dd656 (patch) | |
| tree | 9d1b4b767bf3d4be232c96b170f8eb13015718be /include/hash.h | |
| parent | 134a65124d1316a043b1da515abddafcb9309714 (diff) | |
hash: Add a way to calculate a hash for any algortihm
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>
Diffstat (limited to 'include/hash.h')
| -rw-r--r-- | include/hash.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/hash.h b/include/hash.h index 2dbbd9b7d57..c402067af8a 100644 --- a/include/hash.h +++ b/include/hash.h @@ -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 |