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Commit d0efb48b authored by Tudor-Dan Ambarus's avatar Tudor-Dan Ambarus Committed by Herbert Xu
Browse files

crypto: ecdh - comply with crypto_kpp_maxsize() 



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: default avatarTudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 7f691050

crypto/ecdh.c

+3 −4
Original line number Diff line number Diff line
@@ -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)