Remove unused y from ECDH key computation

ok jsing

diff --git a/lib/libcrypto/ecdh/ech_key.c b/lib/libcrypto/ecdh/ech_key.c
index e41092a..1dfb3c0 100644 (file)
--- a/lib/libcrypto/ecdh/ech_key.c
+++ b/lib/libcrypto/ecdh/ech_key.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ech_key.c,v 1.19 2023/06/25 19:35:56 tb Exp $ */
+/* $OpenBSD: ech_key.c,v 1.20 2023/07/01 14:39:34 tb Exp $ */
 /* ====================================================================
  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  *
@@ -94,7 +94,7 @@ ossl_ecdh_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
 {
        BN_CTX *ctx;
        EC_POINT *tmp = NULL;
-       BIGNUM *x = NULL, *y = NULL;
+       BIGNUM *x;
        const BIGNUM *priv_key;
        const EC_GROUP* group;
        int ret = -1;
@@ -109,11 +109,11 @@ ossl_ecdh_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
 
        if ((ctx = BN_CTX_new()) == NULL)
                goto err;
+
        BN_CTX_start(ctx);
+
        if ((x = BN_CTX_get(ctx)) == NULL)
                goto err;
-       if ((y = BN_CTX_get(ctx)) == NULL)
-               goto err;
 
        priv_key = EC_KEY_get0_private_key(ecdh);
        if (priv_key == NULL) {
@@ -136,7 +136,7 @@ ossl_ecdh_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
                goto err;
        }
 
-       if (!EC_POINT_get_affine_coordinates(group, tmp, x, y, ctx)) {
+       if (!EC_POINT_get_affine_coordinates(group, tmp, x, NULL, ctx)) {
                ECDHerror(ECDH_R_POINT_ARITHMETIC_FAILURE);
                goto err;
        }