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sbtoelf: handle the case where only one valid key is known

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30833 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Amaury Pouly 2011-10-23 18:14:38 +00:00
parent b93e15c404
commit cab5dbded9
1 changed files with 8 additions and 3 deletions
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11
utils/sbtools/sbtoelf.c
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@ -484,6 +484,7 @@ static void extract(unsigned long filesize)
/* encryption cbc-mac */ /* encryption cbc-mac */
key_array_t keys = NULL; /* array of 16-bytes keys */ key_array_t keys = NULL; /* array of 16-bytes keys */
byte real_key[16]; byte real_key[16];
bool valid_key = false; /* false until a matching key was found */
if(sb_header->nr_keys > 0) if(sb_header->nr_keys > 0)
{ {
keys = read_keys(sb_header->nr_keys); keys = read_keys(sb_header->nr_keys);
@ -512,8 +513,12 @@ static void extract(unsigned long filesize)
cbc_mac(g_buf, NULL, sb_header->header_size + sb_header->nr_sections, cbc_mac(g_buf, NULL, sb_header->header_size + sb_header->nr_sections,
keys[i], zero, &computed_cbc_mac, 1); keys[i], zero, &computed_cbc_mac, 1);
color(RED); color(RED);
if(memcmp(dict_entry->hdr_cbc_mac, computed_cbc_mac, 16) == 0) bool ok = memcmp(dict_entry->hdr_cbc_mac, computed_cbc_mac, 16) == 0;
if(ok)
{
valid_key = true;
printf(" Ok\n"); printf(" Ok\n");
}
else else
printf(" Failed\n"); printf(" Failed\n");
color(GREEN); color(GREEN);
@ -531,9 +536,9 @@ static void extract(unsigned long filesize)
color(YELLOW); color(YELLOW);
print_hex(decrypted_key, 16, false); print_hex(decrypted_key, 16, false);
/* cross-check or copy */ /* cross-check or copy */
if(i == 0) if(valid_key && ok)
memcpy(real_key, decrypted_key, 16); memcpy(real_key, decrypted_key, 16);
else if(memcmp(real_key, decrypted_key, 16) == 0) else if(valid_key && memcmp(real_key, decrypted_key, 16) == 0)
{ {
color(RED); color(RED);
printf(" Cross-Check Ok"); printf(" Cross-Check Ok");