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diff --git a/src/lib/crypto/cipher.hpp b/src/lib/crypto/cipher.hpp
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+/*
+ * Copyright (c) 2021, [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 OWNER 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_CIPHER_HPP
+#define RNP_CIPHER_HPP
+
+#include <memory>
+#include <string>
+#include <repgp/repgp_def.h>
+
+// Note: for AEAD modes we append the authentication tag to the ciphertext as in RFC 5116
+class Cipher {
+  public:
+    // the tag size should be 0 for non-AEAD and must be non-zero for AEAD modes (no default)
+    static std::unique_ptr<Cipher> encryption(pgp_symm_alg_t    cipher,
+                                              pgp_cipher_mode_t mode,
+                                              size_t            tag_size = 0,
+                                              bool              disable_padding = false);
+    static std::unique_ptr<Cipher> decryption(pgp_symm_alg_t    cipher,
+                                              pgp_cipher_mode_t mode,
+                                              size_t            tag_size = 0,
+                                              bool              disable_padding = false);
+
+    virtual bool set_key(const uint8_t *key, size_t key_length) = 0;
+    virtual bool set_iv(const uint8_t *iv, size_t iv_length) = 0;
+    // only valid for AEAD modes
+    virtual bool set_ad(const uint8_t *ad, size_t ad_length) = 0;
+
+    virtual size_t block_size() const;
+    virtual size_t update_granularity() const = 0;
+
+    // input_length must be a multiple of update_granularity
+    virtual bool update(uint8_t *      output,
+                        size_t         output_length,
+                        size_t *       output_written,
+                        const uint8_t *input,
+                        size_t         input_length,
+                        size_t *       input_consumed) = 0;
+    // process final block and perform any padding
+    virtual bool finish(uint8_t *      output,
+                        size_t         output_length,
+                        size_t *       output_written,
+                        const uint8_t *input,
+                        size_t         input_length,
+                        size_t *       input_consumed) = 0;
+
+    virtual ~Cipher();
+
+  protected:
+    Cipher(pgp_symm_alg_t alg);
+
+    pgp_symm_alg_t m_alg;
+};
+
+#endif