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crypto: ecdsa - Rename keylen to bufsize where necessary

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BugLink: https://bugs.launchpad.net/bugs/2102118

[ Upstream commit 703ca5cda1ea04735e48882a7cccff97d57656c3 ]

In cases where 'keylen' was referring to the size of the buffer used by
a curve's digits, it does not reflect the purpose of the variable anymore
once NIST P521 is used. What it refers to then is the size of the buffer,
which may be a few bytes larger than the size a coordinate of a key.
Therefore, rename keylen to bufsize where appropriate.

Tested-by: Lukas Wunner <lukas@wunner.de>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Stable-dep-of: 3b0565c70350 ("crypto: ecdsa - Avoid signed integer overflow on signature decoding")
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 1afc7acbedb8dcae865d5b650c4a12aa4a48bd07 linux-6.6.y)
[koichiroden: from v6.6.70, as a dependency for "crypto: ecdsa - Avoid
signed integer overflow on signature decoding"]
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Stefan Berger
2025-03-12 22:51:00 +09:00
committed by Stefan Bader
parent 9cc9211fb7
commit ff957bdf68
1 changed files with 6 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files
crypto/ecdsa.c
+6 -6
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@@ -35,8 +35,8 @@ struct ecdsa_signature_ctx {
static int ecdsa_get_signature_rs(u64 *dest, size_t hdrlen, unsigned char tag,
const void *value, size_t vlen, unsigned int ndigits)
{
size_t keylen = ndigits * sizeof(u64);
ssize_t diff = vlen - keylen;
size_t bufsize = ndigits * sizeof(u64);
ssize_t diff = vlen - bufsize;
const char *d = value;
u8 rs[ECC_MAX_BYTES];
@@ -58,7 +58,7 @@ static int ecdsa_get_signature_rs(u64 *dest, size_t hdrlen, unsigned char tag,
if (diff)
return -EINVAL;
}
if (-diff >= keylen)
if (-diff >= bufsize)
return -EINVAL;
if (diff) {
@@ -138,7 +138,7 @@ static int ecdsa_verify(struct akcipher_request *req)
{
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm);
size_t keylen = ctx->curve->g.ndigits * sizeof(u64);
size_t bufsize = ctx->curve->g.ndigits * sizeof(u64);
struct ecdsa_signature_ctx sig_ctx = {
.curve = ctx->curve,
};
@@ -165,14 +165,14 @@ static int ecdsa_verify(struct akcipher_request *req)
goto error;
/* if the hash is shorter then we will add leading zeros to fit to ndigits */
diff = keylen - req->dst_len;
diff = bufsize - req->dst_len;
if (diff >= 0) {
if (diff)
memset(rawhash, 0, diff);
memcpy(&rawhash[diff], buffer + req->src_len, req->dst_len);
} else if (diff < 0) {
/* given hash is longer, we take the left-most bytes */
memcpy(&rawhash, buffer + req->src_len, keylen);
memcpy(&rawhash, buffer + req->src_len, bufsize);
}
ecc_swap_digits((u64 *)rawhash, hash, ctx->curve->g.ndigits);