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diff --git a/src/lib/crypto/signatures.h b/src/lib/crypto/signatures.h
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+/*
+ * Copyright (c) 2018-2022, [Ribose Inc](https://www.ribose.com).
+ * 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 RNP_SIGNATURES_H_
+#define RNP_SIGNATURES_H_
+
+#include "crypto/hash.hpp"
+
+/**
+ * @brief Initialize a signature computation.
+ * @param key the key that will be used to sign or verify
+ * @param hash_alg the digest algo to be used
+ * @param hash digest object that will be initialized
+ */
+std::unique_ptr<rnp::Hash> signature_init(const pgp_key_material_t &key,
+                                          pgp_hash_alg_t            hash_alg);
+
+/**
+ * @brief Calculate signature with pre-populated hash
+ * @param sig signature to calculate
+ * @param seckey signing secret key material
+ * @param hash pre-populated with signed data hash context. It is finalized and destroyed
+ *             during the execution. Signature fields and trailer are hashed in this function.
+ * @param rng random number generator
+ */
+void signature_calculate(pgp_signature_t &     sig,
+                         pgp_key_material_t &  seckey,
+                         rnp::Hash &           hash,
+                         rnp::SecurityContext &ctx);
+
+/**
+ * @brief Validate a signature with pre-populated hash. This method just checks correspondence
+ *        between the hash and signature material. Expiration time and other fields are not
+ *        checked for validity.
+ * @param sig signature to validate
+ * @param key public key material of the verifying key
+ * @param hash pre-populated with signed data hash context. It is finalized
+ *             during the execution. Signature fields and trailer are hashed in this function.
+ * @return RNP_SUCCESS if signature was successfully validated or error code otherwise.
+ */
+rnp_result_t signature_validate(const pgp_signature_t &     sig,
+                                const pgp_key_material_t &  key,
+                                rnp::Hash &                 hash,
+                                const rnp::SecurityContext &ctx);
+
+#endif