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crypto: ecdh - comply with crypto_kpp_maxsize()

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crypto_kpp_maxsize() asks for the output buffer size without
caring for errors. It allways assume that will be called after
a valid setkey. Comply with it and return what he wants.

nbytes has no sense now, remove it and directly return the maxsize.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tudor-Dan Ambarus 2017-05-25 10:18:10 +03:00 committed by Herbert Xu
parent 7f69105077
commit d0efb48b86
1 changed files with 3 additions and 4 deletions
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7
crypto/ecdh.c
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@ -104,13 +104,12 @@ static int ecdh_compute_value(struct kpp_request *req)
return ret;
}
static int ecdh_max_size(struct crypto_kpp *tfm)
static unsigned int ecdh_max_size(struct crypto_kpp *tfm)
{
struct ecdh_ctx *ctx = ecdh_get_ctx(tfm);
int nbytes = ctx->ndigits << ECC_DIGITS_TO_BYTES_SHIFT;
/* Public key is made of two coordinates */
return 2 * nbytes;
/* Public key is made of two coordinates, add one to the left shift */
return ctx->ndigits << (ECC_DIGITS_TO_BYTES_SHIFT + 1);
}
static void no_exit_tfm(struct crypto_kpp *tfm)