Provide DH_set0_pqg.

ok jsing

3 files changed, 26 insertions, 2 deletions

diff --git a/src/lib/libcrypto/Symbols.list b/src/lib/libcrypto/Symbols.list
index 79b2e946dc..ab4c8593d7 100644
--- a/src/lib/libcrypto/Symbols.list
+++ b/src/lib/libcrypto/Symbols.list
@@ -751,6 +751,7 @@ DH_get_ex_data
 DH_get_ex_new_index
 DH_new
 DH_new_method
+DH_set0_pqg
 DH_set_default_method
 DH_set_ex_data
 DH_set_method
diff --git a/src/lib/libcrypto/dh/dh.h b/src/lib/libcrypto/dh/dh.h
index 61c7d6c873..e5daa2cbdd 100644
--- a/src/lib/libcrypto/dh/dh.h
+++ b/src/lib/libcrypto/dh/dh.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: dh.h,v 1.19 2018/02/17 13:47:36 tb Exp $ */
+/* $OpenBSD: dh.h,v 1.20 2018/02/18 12:51:31 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -190,6 +190,7 @@ void *DH_get_ex_data(DH *d, int idx);
 
 void DH_get0_pqg(const DH *dh, const BIGNUM **p, const BIGNUM **q,
     const BIGNUM **g);
+int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
 void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key);
 
 /* Deprecated version */
diff --git a/src/lib/libcrypto/dh/dh_lib.c b/src/lib/libcrypto/dh/dh_lib.c
index 5a54ca88da..31857727e2 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 1.23 2018/02/17 13:47:36 tb Exp $ */
+/* $OpenBSD: dh_lib.c,v 1.24 2018/02/18 12:51:31 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -251,6 +251,28 @@ DH_get0_pqg(const DH *dh, const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
                 *g = dh->g;
 }
 
+int
+DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
+{
+        if ((dh->p == NULL && p == NULL) || (dh->g == NULL && g == NULL))
+                return 0;
+
+        if (p != NULL) {
+                BN_free(dh->p);
+                dh->p = p;
+        }
+        if (q != NULL) {
+                BN_free(dh->q);
+                dh->q = q;
+        }
+        if (g != NULL) {
+                BN_free(dh->g);
+                dh->g = g;
+        }
+
+        return 1;
+}
+
 void
 DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
 {