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ecdh: add error codes for point at infinity/not on curve

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The point at infinity would previously raise EC_R_POINT_AT_INFINITY via
EC_POINT_get_affine_coordinates(). For consistency, also raise an error
for off-curve points.

pointed out by/ok kenjiro
This commit is contained in:
tb
2026-06-09 05:24:47 +00:00
parent d027729733
commit a6259270fd
1 changed files with 7 additions and 3 deletions
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lib/libcrypto/ecdh/ecdh.c
+7 -3
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@@ -1,4 +1,4 @@
/* $OpenBSD: ecdh.c,v 1.14 2026/06/08 12:08:08 tb Exp $ */
/* $OpenBSD: ecdh.c,v 1.15 2026/06/09 05:24:47 tb Exp $ */
/* ====================================================================
* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
*
@@ -169,11 +169,15 @@ ec_key_ecdh_compute_key(unsigned char **out, size_t *out_len,
if ((group = EC_KEY_get0_group(ecdh)) == NULL)
goto err;
if (EC_POINT_is_at_infinity(group, pub_key))
if (EC_POINT_is_at_infinity(group, pub_key)) {
ECerror(EC_R_POINT_AT_INFINITY);
goto err;
}
if (EC_POINT_is_on_curve(group, pub_key, ctx) <= 0)
if (EC_POINT_is_on_curve(group, pub_key, ctx) <= 0) {
ECerror(EC_R_POINT_IS_NOT_ON_CURVE);
goto err;
}
if ((point = EC_POINT_new(group)) == NULL) {
ECerror(ERR_R_MALLOC_FAILURE);