Move ecdh_KDF_X9_63() to ec_local.h

In anticipation of merging ecdh/ and ecdsa/ into ec/, move the last
remaining thing in ech_local.h where it will soon belong.

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/libcrypto/ec/ec_local.h b/lib/libcrypto/ec/ec_local.h
index 6913cb5683c..84e20375c28 100644
--- a/lib/libcrypto/ec/ec_local.h
+++ b/lib/libcrypto/ec/ec_local.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: ec_local.h,v 1.19 2023/06/25 18:52:27 tb Exp $ */
+/* $OpenBSD: ec_local.h,v 1.20 2023/06/25 19:20:57 tb Exp $ */
 /*
  * Originally written by Bodo Moeller for the OpenSSL project.
  */
@@ -362,6 +362,12 @@ int ossl_ecdsa_verify(int type, const unsigned char *dgst, int dgst_len,
 int ossl_ecdsa_verify_sig(const unsigned char *dgst, int dgst_len,
     const ECDSA_SIG *sig, EC_KEY *eckey);
 
+/*
+ * ECDH Key Derivation Function as defined in ANSI X9.63.
+ */
+int ecdh_KDF_X9_63(unsigned char *out, size_t outlen, const unsigned char *Z,
+    size_t Zlen, const unsigned char *sinfo, size_t sinfolen, const EVP_MD *md);
+
 void *EC_KEY_get_key_method_data(EC_KEY *key,
     void *(*dup_func)(void *), void (*free_func)(void *),
     void (*clear_free_func)(void *));