From patchwork Sat Jan 5 01:51:56 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [U-Boot, RFC, 27/44] hash: Add a way to calculate a hash for any algortihm Date: Fri, 04 Jan 2013 15:51:56 -0000 From: Simon Glass X-Patchwork-Id: 209628 Message-Id: <1357350734-13737-28-git-send-email-sjg@chromium.org> To: U-Boot Mailing List Cc: Joel A Fernandes , Joe Hershberger , Tom Rini , Vadim Bendebury , =?UTF-8?q?Andreas=20B=C3=A4ck?= 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 --- common/hash.c | 22 ++++++++++++++++++++++ include/hash.h | 15 +++++++++++++++ 2 files changed, 37 insertions(+), 0 deletions(-) diff --git a/common/hash.c b/common/hash.c index 2e0a67b..897b9a3 100644 --- a/common/hash.c +++ b/common/hash.c @@ -29,6 +29,7 @@ #include #include #include +#include /* * These are the hash algorithms we support. Chips which support accelerated @@ -171,6 +172,27 @@ 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, 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; + } + *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 verify, cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { diff --git a/include/hash.h b/include/hash.h index ba2ba65..dda6f79 100644 --- a/include/hash.h +++ b/include/hash.h @@ -66,4 +66,19 @@ struct hash_algo { int hash_command(const char *algo_name, int verify, cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]); +/** + * hash_block() - Hash a block according to the requested algorithm + * + * @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, the number of bytes available in output, + * On exit, the number of bytes used + * @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, int len, + uint8_t *output, int *output_size); + #endif