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diff --git a/src/lib/crypto/hash.hpp b/src/lib/crypto/hash.hpp
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+/*
+ * Copyright (c) 2017-2022 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 CRYPTO_HASH_H_
+#define CRYPTO_HASH_H_
+
+#include <repgp/repgp_def.h>
+#include "types.h"
+#include "config.h"
+#include <memory>
+#include <vector>
+#include <array>
+
+/**
+ * Output size (in bytes) of biggest supported hash algo
+ */
+#define PGP_MAX_HASH_SIZE (64)
+
+namespace rnp {
+class Hash {
+  protected:
+    pgp_hash_alg_t alg_;
+    size_t         size_;
+    Hash(pgp_hash_alg_t alg) : alg_(alg)
+    {
+        size_ = Hash::size(alg);
+    };
+
+  public:
+    pgp_hash_alg_t alg() const;
+    size_t         size() const;
+
+    static std::unique_ptr<Hash>  create(pgp_hash_alg_t alg);
+    virtual std::unique_ptr<Hash> clone() const = 0;
+
+    virtual void   add(const void *buf, size_t len) = 0;
+    virtual void   add(uint32_t val);
+    virtual void   add(const pgp_mpi_t &mpi);
+    virtual size_t finish(uint8_t *digest = NULL) = 0;
+
+    virtual ~Hash();
+
+    /* Hash algorithm by string representation from cleartext-signed text */
+    static pgp_hash_alg_t alg(const char *name);
+    /* Hash algorithm representation for cleartext-signed text */
+    static const char *name(pgp_hash_alg_t alg);
+    /* Size of the hash algorithm output or 0 if algorithm is unknown */
+    static size_t size(pgp_hash_alg_t alg);
+};
+
+class CRC24 {
+  protected:
+    CRC24(){};
+
+  public:
+    static std::unique_ptr<CRC24> create();
+
+    virtual void                   add(const void *buf, size_t len) = 0;
+    virtual std::array<uint8_t, 3> finish() = 0;
+
+    virtual ~CRC24(){};
+};
+
+class HashList {
+  public:
+    std::vector<std::unique_ptr<Hash>> hashes;
+
+    void        add_alg(pgp_hash_alg_t alg);
+    const Hash *get(pgp_hash_alg_t alg) const;
+    void        add(const void *buf, size_t len);
+};
+
+} // namespace rnp
+
+#endif