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diff --git a/src/lib/crypto/eddsa.h b/src/lib/crypto/eddsa.h
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+/*
+ * Copyright (c) 2017, [Ribose Inc](https://www.ribose.com).
+ * All rights reserved.
+ *
+ * This code is originally derived from software contributed to
+ * The NetBSD Foundation by Alistair Crooks (agc@netbsd.org), and
+ * carried further by Ribose Inc (https://www.ribose.com).
+ *
+ * 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``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 COPYRIGHT HOLDERS OR CONTRIBUTORS
+ * 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 RNP_ED25519_H_
+#define RNP_ED25519_H_
+
+#include "ec.h"
+
+rnp_result_t eddsa_validate_key(rnp::RNG *rng, const pgp_ec_key_t *key, bool secret);
+/*
+ * curve_len must be 255 currently (for Ed25519)
+ * If Ed448 was supported in the future curve_len=448 would also be allowed.
+ */
+rnp_result_t eddsa_generate(rnp::RNG *rng, pgp_ec_key_t *key);
+
+rnp_result_t eddsa_verify(const pgp_ec_signature_t *sig,
+                          const uint8_t *           hash,
+                          size_t                    hash_len,
+                          const pgp_ec_key_t *      key);
+
+rnp_result_t eddsa_sign(rnp::RNG *          rng,
+                        pgp_ec_signature_t *sig,
+                        const uint8_t *     hash,
+                        size_t              hash_len,
+                        const pgp_ec_key_t *key);
+
+#endif