lib: rsa: check algo match in rsa_verify_with_keynode
The algo name should match between the FIT's signature node and the
U-Boot's control FDT.
If we do not check it, U-Boot's control FDT can expect sha512 hash but
nothing will prevent to accept image with sha1 hash if the signature is correct.
Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr>
diff --git a/lib/rsa/rsa-verify.c b/lib/rsa/rsa-verify.c
index 2057f68..b9c800c 100644
--- a/lib/rsa/rsa-verify.c
+++ b/lib/rsa/rsa-verify.c
@@ -439,12 +439,17 @@
struct key_prop prop;
int length;
int ret = 0;
+ const char *algo;
if (node < 0) {
debug("%s: Skipping invalid node", __func__);
return -EBADF;
}
+ algo = fdt_getprop(blob, node, "algo", NULL);
+ if (strcmp(info->name, algo))
+ return -EFAULT;
+
prop.num_bits = fdtdec_get_int(blob, node, "rsa,num-bits", 0);
prop.n0inv = fdtdec_get_int(blob, node, "rsa,n0-inverse", 0);