184 lines
3.9 KiB
C
184 lines
3.9 KiB
C
/*
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* digest.c - Calculate a md5/sha1/sha256 checksum of a memory area
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*
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* Copyright (c) 2011 Peter Korsgaard <jacmet@sunsite.dk>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <fs.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <xfuncs.h>
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#include <malloc.h>
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#include <digest.h>
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static int file_digest(struct digest *d, char *filename,
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ulong start, ulong size)
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{
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ulong len = 0;
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int fd, now, i, ret = 0;
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unsigned char *buf;
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d->init(d);
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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perror(filename);
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return fd;
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}
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if (start > 0) {
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ret = lseek(fd, start, SEEK_SET);
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if (ret == -1) {
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perror("lseek");
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goto out;
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}
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}
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buf = xmalloc(4096);
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while (size) {
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now = min((ulong)4096, size);
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now = read(fd, buf, now);
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if (now < 0) {
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ret = now;
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perror("read");
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goto out_free;
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}
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if (!now)
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break;
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if (ctrlc()) {
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ret = -EINTR;
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goto out_free;
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}
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d->update(d, buf, now);
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size -= now;
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len += now;
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}
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d->final(d, buf);
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for (i = 0; i < d->length; i++)
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printf("%02x", buf[i]);
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printf(" %s\t0x%08lx ... 0x%08lx\n", filename, start, start + len);
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out_free:
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free(buf);
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out:
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close(fd);
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return ret;
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}
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static int do_digest(char *algorithm, int argc, char *argv[])
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{
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struct digest *d;
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int ret = 0;
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d = digest_get_by_name(algorithm);
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BUG_ON(!d);
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if (argc < 2)
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return COMMAND_ERROR_USAGE;
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argv++;
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while (*argv) {
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char *filename = "/dev/mem";
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ulong start = 0, size = ~0;
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/* arguments are either file, file+area or area */
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if (parse_area_spec(*argv, &start, &size)) {
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filename = *argv;
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if (argv[1] && !parse_area_spec(argv[1], &start, &size))
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argv++;
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}
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if (file_digest(d, filename, start, size) < 0)
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ret = 1;
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argv++;
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}
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return ret;
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}
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#ifdef CONFIG_CMD_MD5SUM
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static int do_md5(struct command *cmdtp, int argc, char *argv[])
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{
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return do_digest("md5", argc, argv);
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}
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BAREBOX_CMD_HELP_START(md5sum)
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BAREBOX_CMD_HELP_USAGE("md5sum [[FILE] [AREA]]...\n")
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BAREBOX_CMD_HELP_SHORT("Calculate a md5 checksum of a memory area.\n")
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BAREBOX_CMD_HELP_END
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BAREBOX_CMD_START(md5sum)
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.cmd = do_md5,
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.usage = "md5 checksum calculation",
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BAREBOX_CMD_HELP(cmd_md5sum_help)
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BAREBOX_CMD_END
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#endif /* CMD_CMD_MD5SUM */
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#ifdef CONFIG_CMD_SHA1SUM
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static int do_sha1(struct command *cmdtp, int argc, char *argv[])
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{
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return do_digest("sha1", argc, argv);
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}
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BAREBOX_CMD_HELP_START(sha1sum)
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BAREBOX_CMD_HELP_USAGE("sha1sum [[FILE] [AREA]]...\n")
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BAREBOX_CMD_HELP_SHORT("Calculate a sha1 checksum of a memory area.\n")
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BAREBOX_CMD_HELP_END
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BAREBOX_CMD_START(sha1sum)
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.cmd = do_sha1,
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.usage = "sha1 checksum calculation",
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BAREBOX_CMD_HELP(cmd_sha1sum_help)
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BAREBOX_CMD_END
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#endif /* CMD_CMD_SHA1SUM */
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#ifdef CONFIG_CMD_SHA256SUM
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static int do_sha256(struct command *cmdtp, int argc, char *argv[])
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{
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return do_digest("sha256", argc, argv);
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}
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BAREBOX_CMD_HELP_START(sha256sum)
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BAREBOX_CMD_HELP_USAGE("sha256sum [[FILE] [AREA]]...\n")
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BAREBOX_CMD_HELP_SHORT("Calculate a sha256 checksum of a memory area.\n")
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BAREBOX_CMD_HELP_END
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BAREBOX_CMD_START(sha256sum)
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.cmd = do_sha256,
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.usage = "sha256 checksum calculation",
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BAREBOX_CMD_HELP(cmd_sha256sum_help)
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BAREBOX_CMD_END
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#endif /* CMD_CMD_SHA256SUM */
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