[PATCH 3/5] public-keys: rsa: allow struct public_key to be const

[Sascha Hauer <s.hauer@pengutronix.de>]

The struct public_key fields will become const in the next step. Prepare
for this by rearranging rsa_of_read_key(): instead of assigning fields
to struct public_key and struct rsa_public_key and modifying them
afterwards, assign the initialized data to the (in future const) fields.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 crypto/rsa.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/crypto/rsa.c b/crypto/rsa.c
index 13b6553c950b033bd8940b0279bfb419f08b052a..e4fc980f9187b49511d5b1a8e68d488944d9b483 100644
--- a/crypto/rsa.c
+++ b/crypto/rsa.c
@@ -384,6 +384,7 @@ static void rsa_convert_big_endian(uint32_t *dst, const uint32_t *src, int len)
 struct public_key *rsa_of_read_key(struct device_node *node)
 {
 	const void *modulus, *rr;
+	void *brr, *bmodulus;
 	const uint64_t *public_exponent;
 	int length;
 	struct public_key *key;
@@ -394,7 +395,8 @@ struct public_key *rsa_of_read_key(struct device_node *node)
 		return ERR_PTR(-EINVAL);
 
 	key = xzalloc(sizeof(*key));
-	rsa = key->rsa = xzalloc(sizeof(*rsa));
+	rsa = xzalloc(sizeof(*rsa));
+	key->rsa = rsa;
 
 	key->key_name_hint = xstrdup(node->name + 4);
 
@@ -426,11 +428,14 @@ struct public_key *rsa_of_read_key(struct device_node *node)
 
 	rsa->len /= sizeof(uint32_t) * 8;
 
-	rsa->modulus = xzalloc(RSA_MAX_KEY_BITS / 8);
-	rsa->rr = xzalloc(RSA_MAX_KEY_BITS / 8);
+	bmodulus = xzalloc(RSA_MAX_KEY_BITS / 8);
+	brr = xzalloc(RSA_MAX_KEY_BITS / 8);
 
-	rsa_convert_big_endian(rsa->modulus, modulus, rsa->len);
-	rsa_convert_big_endian(rsa->rr, rr, rsa->len);
+	rsa_convert_big_endian(bmodulus, modulus, rsa->len);
+	rsa->modulus = bmodulus;
+
+	rsa_convert_big_endian(brr, rr, rsa->len);
+	rsa->rr = brr;
 
 	err = 0;
 out:

-- 
2.47.3