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@xxxxxxxxx>
Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
---
crypto/ecdsa.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/crypto/ecdsa.c b/crypto/ecdsa.c
index 75d3eea885db..c7923f30661b 100644
--- a/crypto/ecdsa.c
+++ b/crypto/ecdsa.c
@@ -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);
--
2.43.0
