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crypto: ecdsa - Replace ndigits with nbits where precision is needed

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Replace the usage of ndigits with nbits where precise space calculations
are needed, such as in ecdsa_max_size where the length of a coordinate is
determined.

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>
This commit is contained in:
Stefan Berger 2024-04-04 10:18:52 -04:00 committed by Herbert Xu
parent 288b46c57c
commit dee45a607a
1 changed files with 1 additions and 1 deletions
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crypto/ecdsa.c
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@ -266,7 +266,7 @@ static unsigned int ecdsa_max_size(struct crypto_akcipher *tfm)
{ {
struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm); struct ecc_ctx *ctx = akcipher_tfm_ctx(tfm);
return ctx->pub_key.ndigits << ECC_DIGITS_TO_BYTES_SHIFT; return DIV_ROUND_UP(ctx->curve->nbits, 8);
} }
static int ecdsa_nist_p384_init_tfm(struct crypto_akcipher *tfm) static int ecdsa_nist_p384_init_tfm(struct crypto_akcipher *tfm)