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Implement verify option for md5sum command 

Loosely based on CONFIG_CRC32_VERIFY.

The sum to verify against can be in memory, in a variable, or the last
parameter to the function directly.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Joe Hershberger 2012-08-17 11:00:47 +00:00 committed by Tom Rini
parent 3c210e29cd
commit 5ab177bede
1 changed files with 105 additions and 0 deletions
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105
common/cmd_md5sum.c
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@ -1,4 +1,7 @@
/*
* (C) Copyright 2011
* Joe Hershberger, National Instruments, joe.hershberger@ni.com
*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
@ -25,6 +28,96 @@
#include <command.h>
#include <u-boot/md5.h>
#ifdef CONFIG_MD5SUM_VERIFY
static int parse_verify_sum(char *verify_str, u8 *vsum)
{
if (*verify_str == '*') {
u8 *ptr;
ptr = (u8 *)simple_strtoul(verify_str + 1, NULL, 16);
memcpy(vsum, ptr, 16);
} else {
unsigned int i;
char *vsum_str;
if (strlen(verify_str) == 32)
vsum_str = verify_str;
else {
vsum_str = getenv(verify_str);
if (vsum_str == NULL || strlen(vsum_str) != 32)
return 1;
}
for (i = 0; i < 16; i++) {
char *nullp = vsum_str + (i + 1) * 2;
char end = *nullp;
*nullp = '\0';
*(u8 *)(vsum + i) =
simple_strtoul(vsum_str + (i * 2), NULL, 16);
*nullp = end;
}
}
return 0;
}
int do_md5sum(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
ulong addr, len;
unsigned int i;
u8 output[16];
u8 vsum[16];
int verify = 0;
int ac;
char * const *av;
if (argc < 3)
return CMD_RET_USAGE;
av = argv + 1;
ac = argc - 1;
if (strcmp(*av, "-v") == 0) {
verify = 1;
av++;
ac--;
if (ac < 3)
return CMD_RET_USAGE;
}
addr = simple_strtoul(*av++, NULL, 16);
len = simple_strtoul(*av++, NULL, 16);
md5_wd((unsigned char *) addr, len, output, CHUNKSZ_MD5);
if (!verify) {
printf("md5 for %08lx ... %08lx ==> ", addr, addr + len - 1);
for (i = 0; i < 16; i++)
printf("%02x", output[i]);
printf("\n");
} else {
char *verify_str = *av++;
if (parse_verify_sum(verify_str, vsum)) {
printf("ERROR: %s does not contain a valid md5 sum\n",
verify_str);
return 1;
}
if (memcmp(output, vsum, 16) != 0) {
printf("md5 for %08lx ... %08lx ==> ", addr,
addr + len - 1);
for (i = 0; i < 16; i++)
printf("%02x", output[i]);
printf(" != ");
for (i = 0; i < 16; i++)
printf("%02x", vsum[i]);
printf(" ** ERROR **\n");
return 1;
}
}
return 0;
}
#else
static int do_md5sum(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
unsigned long addr, len;
@ -45,9 +138,21 @@ static int do_md5sum(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
return 0;
}
#endif
#ifdef CONFIG_MD5SUM_VERIFY
U_BOOT_CMD(
md5sum, 5, 1, do_md5sum,
"compute MD5 message digest",
"address count\n"
" - compute MD5 message digest\n"
"md5sum -v address count [*]sum\n"
" - verify md5sum of memory area"
);
#else
U_BOOT_CMD(
md5sum, 3, 1, do_md5sum,
"compute MD5 message digest",
"address count"
);
#endif