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diff --git a/src/lib/crypto/ecdsa.h b/src/lib/crypto/ecdsa.h
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+/*-
+ * Copyright (c) 2017 Ribose Inc.
+ * 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 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 ECDSA_H_
+#define ECDSA_H_
+
+#include "crypto/ec.h"
+
+rnp_result_t ecdsa_validate_key(rnp::RNG *rng, const pgp_ec_key_t *key, bool secret);
+
+rnp_result_t ecdsa_sign(rnp::RNG *          rng,
+                        pgp_ec_signature_t *sig,
+                        pgp_hash_alg_t      hash_alg,
+                        const uint8_t *     hash,
+                        size_t              hash_len,
+                        const pgp_ec_key_t *key);
+
+rnp_result_t ecdsa_verify(const pgp_ec_signature_t *sig,
+                          pgp_hash_alg_t            hash_alg,
+                          const uint8_t *           hash,
+                          size_t                    hash_len,
+                          const pgp_ec_key_t *      key);
+
+/*
+ * @brief   Returns hash which should be used with the curve
+ *
+ * @param   curve Curve ID
+ *
+ * @returns  Either ID of the hash algorithm, or PGP_HASH_UNKNOWN
+ *           if not found
+ */
+pgp_hash_alg_t ecdsa_get_min_hash(pgp_curve_t curve);
+
+#endif // ECDSA_H_