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crypto: ecrdsa - Fix signature size calculation

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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 <lukas@wunner.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Lukas Wunner 2024-09-10 16:30:29 +02:00 committed by Herbert Xu
parent b04163863c
commit b9cbf6916e
1 changed files with 8 additions and 0 deletions
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8
crypto/ecrdsa.c
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@ -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",