linux-kernel - [PATCH] crypto: ecdsa: Fix the public key format description

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Message-ID: <20240527202840.4818-1-jarkko@kernel.org>
Date: Mon, 27 May 2024 23:28:39 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: linux-crypto@...r.kernel.org,
	Jarkko Sakkinen <jarkko@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Stefan Berger <stefanb@...ux.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] crypto: ecdsa: Fix the public key format description

Public key blob is not just x and y concatenated. It follows RFC5480
section 2.2. Address this by re-documenting the function with the
correct description of the format.

Link: https://datatracker.ietf.org/doc/html/rfc5480
Fixes: 4e6602916bc6 ("crypto: ecdsa - Add support for ECDSA signature verification")
Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
---
It is a bug fix that does not really need a stable backport. Still
categorizes as a bug because by following the existing documentation
you end up with an error code.
 crypto/ecdsa.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/crypto/ecdsa.c b/crypto/ecdsa.c
index 258fffbf623d..55114146ff84 100644
--- a/crypto/ecdsa.c
+++ b/crypto/ecdsa.c
@@ -215,9 +215,8 @@ static int ecdsa_ecc_ctx_reset(struct ecc_ctx *ctx)
 }
 
 /*
- * Set the public key given the raw uncompressed key data from an X509
- * certificate. The key data contain the concatenated X and Y coordinates of
- * the public key.
+ * Set the public ECC key as defined by RFC5480 section 2.2 "Subject Public
+ * Key". Only the uncompressed format is supported.
  */
 static int ecdsa_set_pub_key(struct crypto_akcipher *tfm, const void *key, unsigned int keylen)
 {
-- 
2.45.1