From b9cbf6916e0a6899bc67ee574993b7f24d3f606b Mon Sep 17 00:00:00 2001 From: Lukas Wunner Date: Tue, 10 Sep 2024 16:30:29 +0200 Subject: [PATCH] crypto: ecrdsa - Fix signature size calculation software_key_query() returns the curve size as maximum signature size for ecrdsa. However it should return twice as much. It's only the maximum signature size that seems to be off. The maximum digest size is likewise set to the curve size, but that's correct as it matches the checks in ecrdsa_set_pub_key() and ecrdsa_verify(). Signed-off-by: Lukas Wunner Signed-off-by: Herbert Xu --- crypto/ecrdsa.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/crypto/ecrdsa.c b/crypto/ecrdsa.c index f981b31f4249..b3dd8a3ddeb7 100644 --- a/crypto/ecrdsa.c +++ b/crypto/ecrdsa.c @@ -252,6 +252,13 @@ static unsigned int ecrdsa_key_size(struct crypto_sig *tfm) return ctx->pub_key.ndigits * sizeof(u64); } +static unsigned int ecrdsa_max_size(struct crypto_sig *tfm) +{ + struct ecrdsa_ctx *ctx = crypto_sig_ctx(tfm); + + return 2 * ctx->pub_key.ndigits * sizeof(u64); +} + static void ecrdsa_exit_tfm(struct crypto_sig *tfm) { } @@ -260,6 +267,7 @@ static struct sig_alg ecrdsa_alg = { .verify = ecrdsa_verify, .set_pub_key = ecrdsa_set_pub_key, .key_size = ecrdsa_key_size, + .max_size = ecrdsa_max_size, .exit = ecrdsa_exit_tfm, .base = { .cra_name = "ecrdsa",