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diff --git a/src/lib/crypto/ecdh_utils.h b/src/lib/crypto/ecdh_utils.h
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+++ b/src/lib/crypto/ecdh_utils.h
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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 ECDH_UTILS_H_
+#define ECDH_UTILS_H_
+
+#include "ecdh.h"
+
+#define MAX_SP800_56A_OTHER_INFO 56
+// Keys up to 312 bits (+1 bytes of PKCS5 padding)
+#define MAX_SESSION_KEY_SIZE 40
+#define MAX_AES_KEY_SIZE 32
+
+size_t kdf_other_info_serialize(uint8_t                  other_info[MAX_SP800_56A_OTHER_INFO],
+                                const ec_curve_desc_t *  ec_curve,
+                                const pgp_fingerprint_t &fingerprint,
+                                const pgp_hash_alg_t     kdf_hash,
+                                const pgp_symm_alg_t     wrap_alg);
+
+bool pad_pkcs7(uint8_t *buf, size_t buf_len, size_t offset);
+
+bool unpad_pkcs7(uint8_t *buf, size_t buf_len, size_t *offset);
+
+#endif // ECDH_UTILS_H_