Prepare to provide DH_get_length()

Will be needed by openssl(1) dhparam.

ok inoguchi jsing

2 files changed, 11 insertions, 2 deletions

diff --git a/src/lib/libcrypto/dh/dh.h b/src/lib/libcrypto/dh/dh.h
index 8e57c191c4..83ad67bebf 100644
--- a/src/lib/libcrypto/dh/dh.h
+++ b/src/lib/libcrypto/dh/dh.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: dh.h,v 1.27 2022/01/05 20:30:16 tb Exp $ */
+/* $OpenBSD: dh.h,v 1.28 2022/01/05 20:36:29 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -209,6 +209,9 @@ const BIGNUM *DH_get0_pub_key(const DH *dh);
 void DH_clear_flags(DH *dh, int flags);
 int DH_test_flags(const DH *dh, int flags);
 void DH_set_flags(DH *dh, int flags);
+#if defined(LIBRESSL_OPAQUE_DH) || defined(LIBRESSL_CRYPTO_INTERNAL)
+long DH_get_length(const DH *dh);
+#endif
 int DH_set_length(DH *dh, long length);
 
 /* Deprecated version */
diff --git a/src/lib/libcrypto/dh/dh_lib.c b/src/lib/libcrypto/dh/dh_lib.c
index 58f01b6e6a..d331e7cd08 100644
--- a/src/lib/libcrypto/dh/dh_lib.c
+++ b/src/lib/libcrypto/dh/dh_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: dh_lib.c,v 1.34 2022/01/05 20:30:16 tb Exp $ */
+/* $OpenBSD: dh_lib.c,v 1.35 2022/01/05 20:36:29 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -355,6 +355,12 @@ DH_set_flags(DH *dh, int flags)
         dh->flags |= flags;
 }
 
+long
+DH_get_length(const DH *dh)
+{
+        return dh->length;
+}
+
 int
 DH_set_length(DH *dh, long length)
 {