--- src/libstrongswan/plugins/openssl/openssl_rsa_public_key.h.orig	2017-04-24 17:42:53.000000000 +1000
+++ src/libstrongswan/plugins/openssl/openssl_rsa_public_key.h	2017-04-24 17:43:27.000000000 +1000
@@ -21,6 +21,139 @@
 #ifndef OPENSSL_RSA_PUBLIC_KEY_H_
 #define OPENSSL_RSA_PUBLIC_KEY_H_
 
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+/**
+ * OpenSSL compat functions
+ * From https://wiki.openssl.org/index.php/OpenSSL_1.1.0_Changes
+*/
+
+/* See src/libstrongswan/plugins/openssl/openssl_util.c #define OBJ_get0_data(o) ((o)->data)
+#define OBJ_length(o) ((o)->length) /*
+
+#include <string.h>
+#include <openssl/engine.h>
+
+int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d)
+{
+   /* If the fields n and e in r are NULL, the corresponding input
+    * parameters MUST be non-NULL for n and e.  d may be
+    * left NULL (in case only the public key is used).
+    */
+   if ((r->n == NULL && n == NULL)
+       || (r->e == NULL && e == NULL))
+       return 0;
+
+   if (n != NULL) {
+       BN_free(r->n);
+       r->n = n;
+   }
+   if (e != NULL) {
+       BN_free(r->e);
+       r->e = e;
+   }
+   if (d != NULL) {
+       BN_free(r->d);
+       r->d = d;
+   }
+
+   return 1;
+}
+
+int RSA_set0_factors(RSA *r, BIGNUM *p, BIGNUM *q)
+{
+   /* If the fields p and q in r are NULL, the corresponding input
+    * parameters MUST be non-NULL.
+    */
+   if ((r->p == NULL && p == NULL)
+       || (r->q == NULL && q == NULL))
+       return 0;
+
+   if (p != NULL) {
+       BN_free(r->p);
+       r->p = p;
+   }
+   if (q != NULL) {
+       BN_free(r->q);
+       r->q = q;
+   }
+
+   return 1;
+}
+
+int RSA_set0_crt_params(RSA *r, BIGNUM *dmp1, BIGNUM *dmq1, BIGNUM *iqmp)
+{
+   /* If the fields dmp1, dmq1 and iqmp in r are NULL, the corresponding input
+    * parameters MUST be non-NULL.
+    */
+   if ((r->dmp1 == NULL && dmp1 == NULL)
+       || (r->dmq1 == NULL && dmq1 == NULL)
+       || (r->iqmp == NULL && iqmp == NULL))
+       return 0;
+
+   if (dmp1 != NULL) {
+       BN_free(r->dmp1);
+       r->dmp1 = dmp1;
+   }
+   if (dmq1 != NULL) {
+       BN_free(r->dmq1);
+       r->dmq1 = dmq1;
+   }
+   if (iqmp != NULL) {
+       BN_free(r->iqmp);
+       r->iqmp = iqmp;
+   }
+
+   return 1;
+}
+
+void RSA_get0_key(const RSA *r,
+                  const BIGNUM **n, const BIGNUM **e, const BIGNUM **d)
+{
+   if (n != NULL)
+       *n = r->n;
+   if (e != NULL)
+       *e = r->e;
+   if (d != NULL)
+       *d = r->d;
+}
+
+void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
+ {
+    if (pub_key != NULL)
+        *pub_key = dh->pub_key;
+    if (priv_key != NULL)
+        *priv_key = dh->priv_key;
+ }
+
+int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
+{
+    /* If the field pub_key in dh is NULL, the corresponding input
+     * parameters MUST be non-NULL.  The priv_key field may
+     * be left NULL.
+     */
+    if (dh->pub_key == NULL && pub_key == NULL)
+        return 0;
+
+    if (pub_key != NULL) {
+        BN_free(dh->pub_key);
+        dh->pub_key = pub_key;
+    }
+    if (priv_key != NULL) {
+        BN_free(dh->priv_key);
+        dh->priv_key = priv_key;
+    }
+
+    return 1;
+}
+
+int DH_set_length(DH *dh, long length)
+{
+    dh->length = length;
+    return 1;
+}
+
+#endif
+
 typedef struct openssl_rsa_public_key_t openssl_rsa_public_key_t;
 
 #include <credentials/keys/public_key.h>