[PATCH v5 3/8] lib: rsa: bring exp_len in line when generating a key_prop

Heiko Stuebner
2020-05-22T14:19:32Z

The exponent field of struct key_prop gets allocated an uint64_t,
and the contents are positioned from the back, so an exponent of
"0x01 0x00 0x01" becomes 0x0 0x0 0x0 0x0 0x0 0x1 0x0 0x1"

Right now rsa_gen_key_prop() allocates a uint64_t but sets exp_len
to the size returned from the parser, while on the other hand the
when getting the key from the devicetree exp_len always gets set to
sizeof(uint64_t).

So bring that in line with the established code.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
---
changes in v4:
- new patch

lib/rsa/rsa-keyprop.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/rsa/rsa-keyprop.c b/lib/rsa/rsa-keyprop.c
index 9464df0093..4b54db44c4 100644
--- a/lib/rsa/rsa-keyprop.c
+++ b/lib/rsa/rsa-keyprop.c
@@ -691,7 +691,7 @@ int rsa_gen_key_prop(const void *key, uint32_t keylen, struct key_prop **prop)
memcpy((void *)(*prop)->public_exponent + sizeof(uint64_t)
- rsa_key.e_sz,
rsa_key.e, rsa_key.e_sz);
- (*prop)->exp_len = rsa_key.e_sz;
+ (*prop)->exp_len = sizeof(uint64_t);

/* n0 inverse */
br_i32_decode(n, &rsa_key.n[i], rsa_key.n_sz - i);
--
2.25.1