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>

diff --git a/common/cmd_md5sum.c b/common/cmd_md5sum.c
index b93dd9b440cb34e0ebb3deead9ad5e71ec7fb83e..fbe0aba84159bc14702087b9034e6624677689f1 100644 (file)
--- a/common/cmd_md5sum.c
+++ b/common/cmd_md5sum.c
@@ -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