--- a/conserver/main.c	2026-05-11 12:58:13
+++ b/conserver/main.c	2026-05-11 13:01:10
@@ -112,12 +112,25 @@
 
     if ((dh = DH_new()) == NULL)
 	return (NULL);
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L  /* OpenSSL >= 1.1.0 */
+    {
+	BIGNUM *p = BN_bin2bn(dh512_p, sizeof(dh512_p), NULL);
+	BIGNUM *g = BN_bin2bn(dh512_g, sizeof(dh512_g), NULL);
+	if (p == NULL || g == NULL || !DH_set0_pqg(dh, p, NULL, g)) {
+	    BN_free(p);
+	    BN_free(g);
+	    DH_free(dh);
+	    return (NULL);
+	}
+    }
+#else
     dh->p = BN_bin2bn(dh512_p, sizeof(dh512_p), NULL);
     dh->g = BN_bin2bn(dh512_g, sizeof(dh512_g), NULL);
     if ((dh->p == NULL) || (dh->g == NULL)) {
 	DH_free(dh);
 	return (NULL);
     }
+#endif
     return (dh);
 }
 
@@ -146,12 +159,25 @@
 
     if ((dh = DH_new()) == NULL)
 	return (NULL);
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L  /* OpenSSL >= 1.1.0 */
+    {
+	BIGNUM *p = BN_bin2bn(dh1024_p, sizeof(dh1024_p), NULL);
+	BIGNUM *g = BN_bin2bn(dh1024_g, sizeof(dh1024_g), NULL);
+	if (p == NULL || g == NULL || !DH_set0_pqg(dh, p, NULL, g)) {
+	    BN_free(p);
+	    BN_free(g);
+	    DH_free(dh);
+	    return (NULL);
+	}
+    }
+#else
     dh->p = BN_bin2bn(dh1024_p, sizeof(dh1024_p), NULL);
     dh->g = BN_bin2bn(dh1024_g, sizeof(dh1024_g), NULL);
     if ((dh->p == NULL) || (dh->g == NULL)) {
 	DH_free(dh);
 	return (NULL);
     }
+#endif
     return (dh);
 }
 
@@ -193,12 +219,25 @@
 
     if ((dh = DH_new()) == NULL)
 	return (NULL);
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L  /* OpenSSL >= 1.1.0 */
+    {
+	BIGNUM *p = BN_bin2bn(dh2048_p, sizeof(dh2048_p), NULL);
+	BIGNUM *g = BN_bin2bn(dh2048_g, sizeof(dh2048_g), NULL);
+	if (p == NULL || g == NULL || !DH_set0_pqg(dh, p, NULL, g)) {
+	    BN_free(p);
+	    BN_free(g);
+	    DH_free(dh);
+	    return (NULL);
+	}
+    }
+#else
     dh->p = BN_bin2bn(dh2048_p, sizeof(dh2048_p), NULL);
     dh->g = BN_bin2bn(dh2048_g, sizeof(dh2048_g), NULL);
     if ((dh->p == NULL) || (dh->g == NULL)) {
 	DH_free(dh);
 	return (NULL);
     }
+#endif
     return (dh);
 }
 
@@ -266,12 +305,25 @@
 
     if ((dh = DH_new()) == NULL)
 	return (NULL);
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L  /* OpenSSL >= 1.1.0 */
+    {
+	BIGNUM *p = BN_bin2bn(dh4096_p, sizeof(dh4096_p), NULL);
+	BIGNUM *g = BN_bin2bn(dh4096_g, sizeof(dh4096_g), NULL);
+	if (p == NULL || g == NULL || !DH_set0_pqg(dh, p, NULL, g)) {
+	    BN_free(p);
+	    BN_free(g);
+	    DH_free(dh);
+	    return (NULL);
+	}
+    }
+#else
     dh->p = BN_bin2bn(dh4096_p, sizeof(dh4096_p), NULL);
     dh->g = BN_bin2bn(dh4096_g, sizeof(dh4096_g), NULL);
     if ((dh->p == NULL) || (dh->g == NULL)) {
 	DH_free(dh);
 	return (NULL);
     }
+#endif
     return (dh);
 }