diff options
author | Simon Glass <sjg@chromium.org> | 2012-12-05 14:46:36 +0000 |
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committer | Tom Rini <trini@ti.com> | 2012-12-11 13:17:34 -0700 |
commit | 460408ef9a14b8f8896d1bc8aa0f702b47c26bb8 (patch) | |
tree | e8e29f156ba9525ac6d8a34810b8e4126928ae1a /include/hash.h | |
parent | b1f17bf5ff63a7e22e0299dd576c3b6cd38ae665 (diff) |
Add generic hash API
We have a SHA1 command and want to add a SHA256 command also. Instead of
duplicating the code, create a generic hash API which can process
commands for different algorithms.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/hash.h')
-rw-r--r-- | include/hash.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/include/hash.h b/include/hash.h new file mode 100644 index 00000000000..34ba558bd09 --- /dev/null +++ b/include/hash.h @@ -0,0 +1,69 @@ +/* + * Copyright (c) 2012 The Chromium OS Authors. + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#ifndef _HASH_H +#define _HASH_H + +#ifdef CONFIG_SHA1SUM_VERIFY +#define CONFIG_HASH_VERIFY +#endif + +struct hash_algo { + const char *name; /* Name of algorithm */ + int digest_size; /* Length of digest */ + /** + * hash_func_ws: Generic hashing function + * + * This is the generic prototype for a hashing function. We only + * have the watchdog version at present. + * + * @input: Input buffer + * @ilen: Input buffer length + * @output: Checksum result (length depends on algorithm) + * @chunk_sz: Trigger watchdog after processing this many bytes + */ + void (*hash_func_ws)(const unsigned char *input, unsigned int ilen, + unsigned char *output, unsigned int chunk_sz); + int chunk_size; /* Watchdog chunk size */ +}; + +/* + * Maximum digest size for all algorithms we support. Having this value + * avoids a malloc() or C99 local declaration in common/cmd_hash.c. + */ +#define HASH_MAX_DIGEST_SIZE 32 + +/** + * hash_command: Process a hash command for a particular algorithm + * + * This common function is used to implement specific hash commands. + * + * @algo_name: Hash algorithm being used + * @verify: Non-zero to enable verify mode + * @cmdtp: Pointer to command table entry + * @flag: Some flags normally 0 (see CMD_FLAG_.. above) + * @argc: Number of arguments (arg 0 must be the command text) + * @argv: Arguments + */ +int hash_command(const char *algo_name, int verify, cmd_tbl_t *cmdtp, int flag, + int argc, char * const argv[]); + +#endif |