Move ECDH_size() to ech_key.c

This way the public ECDH API that will remain in libcrypto is in one file
and the public ECDH API that will go is in the other one.

1 files changed, 7 insertions, 1 deletions

diff --git a/src/lib/libcrypto/ecdh/ech_key.c b/src/lib/libcrypto/ecdh/ech_key.c
index 5f68b01860..208a4b328e 100644
--- a/src/lib/libcrypto/ecdh/ech_key.c
+++ b/src/lib/libcrypto/ecdh/ech_key.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ech_key.c,v 1.16 2023/06/25 19:04:35 tb Exp $ */
+/* $OpenBSD: ech_key.c,v 1.17 2023/06/25 19:17:43 tb Exp $ */
 /* ====================================================================
  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  *
@@ -199,3 +199,9 @@ ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
         ECerror(EC_R_NOT_IMPLEMENTED);
         return 0;
 }
+
+int
+ECDH_size(const EC_KEY *d)
+{
+        return ((EC_GROUP_get_degree(EC_KEY_get0_group(d)) + 7) / 8);
+}