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+/* $OpenBSD: dh.h,v 1.18 2019/09/06 05:23:55 djm Exp $ */
+
+/*
+ * Copyright (c) 2000 Niels Provos. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef DH_H
+#define DH_H
+
+#ifdef WITH_OPENSSL
+
+struct dhgroup {
+ int size;
+ BIGNUM *g;
+ BIGNUM *p;
+};
+
+DH *choose_dh(int, int, int);
+DH *dh_new_group_asc(const char *, const char *);
+DH *dh_new_group(BIGNUM *, BIGNUM *);
+DH *dh_new_group1(void);
+DH *dh_new_group14(void);
+DH *dh_new_group16(void);
+DH *dh_new_group18(void);
+DH *dh_new_group_fallback(int);
+
+int dh_gen_key(DH *, int);
+int dh_pub_is_valid(const DH *, const BIGNUM *);
+
+u_int dh_estimate(int);
+
+/*
+ * Max value from RFC4419.
+ * Min value from RFC8270.
+ */
+#define DH_GRP_MIN 2048
+#define DH_GRP_MAX 8192
+
+/*
+ * Values for "type" field of moduli(5)
+ * Specifies the internal structure of the prime modulus.
+ */
+#define MODULI_TYPE_UNKNOWN (0)
+#define MODULI_TYPE_UNSTRUCTURED (1)
+#define MODULI_TYPE_SAFE (2)
+#define MODULI_TYPE_SCHNORR (3)
+#define MODULI_TYPE_SOPHIE_GERMAIN (4)
+#define MODULI_TYPE_STRONG (5)
+
+/*
+ * Values for "tests" field of moduli(5)
+ * Specifies the methods used in checking for primality.
+ * Usually, more than one test is used.
+ */
+#define MODULI_TESTS_UNTESTED (0x00)
+#define MODULI_TESTS_COMPOSITE (0x01)
+#define MODULI_TESTS_SIEVE (0x02)
+#define MODULI_TESTS_MILLER_RABIN (0x04)
+#define MODULI_TESTS_JACOBI (0x08)
+#define MODULI_TESTS_ELLIPTIC (0x10)
+
+#endif /* WITH_OPENSSL */
+
+#endif /* DH_H */