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+/*
+
+Header file for the reference implementation of the Kalyna block cipher (DSTU 7624:2014), all block and key length variants
+
+Authors: Ruslan Kiianchuk, Ruslan Mordvinov, Roman Oliynykov
+
+*/
+
+#ifndef KALYNA_H
+#define KALYNA_H
+
+
+#include <stdlib.h>
+#include <string.h>
+
+
+typedef unsigned char uint8_t;
+typedef unsigned long long uint64_t;
+
+/*!
+ * Context to store Kalyna cipher parameters.
+ */
+typedef struct {
+    size_t nb;  /**< Number of 64-bit words in enciphering block. */ 
+    size_t nk;  /**< Number of 64-bit words in key. */
+    size_t nr;  /**< Number of enciphering rounds. */
+    uint64_t* state;  /**< Current cipher state. */
+    uint64_t** round_keys;  /**< Round key computed from enciphering key. */
+} kalyna_t;
+
+
+/*!
+ * Initialize Kalyna parameters and create cipher context.
+ *
+ * @param block_size Enciphering block bit size (128, 256 or 512 bit sizes are 
+ * allowed).
+ * @param block_size Enciphering key bit size. Must be equal or double the
+ * block bit size.
+ * @return Pointer to Kalyna context containing cipher instance
+ * parameters and allocated memory for state and round keys. NULL in case of
+ * error.
+ */
+kalyna_t* KalynaInit(size_t block_size, size_t key_size);
+
+/*!
+ * Delete Kalyna cipher context and free used memory.
+ *
+ * @param ctx Kalyna cipher context.
+ * @return Zero in case of success.
+ */
+int KalynaDelete(kalyna_t* ctx);
+
+/*!
+ * Compute round keys given the enciphering key and store them in cipher
+ * context `ctx`.
+ *
+ * @param key Kalyna enciphering key.
+ * @param ctx Initialized cipher context.
+ */
+void KalynaKeyExpand(uint64_t* key, kalyna_t* ctx);
+
+/*!
+ * Encipher plaintext using Kalyna symmetric block cipher.
+ * KalynaInit() function with appropriate block and enciphering key sizes must
+ * be called beforehand to get the cipher context `ctx`. After all enciphering
+ * is completed KalynaDelete() must be called to free up allocated memory.
+ *
+ * @param plaintext Plaintext of length Nb words for enciphering.
+ * @param ctx Initialized cipher context with precomputed round keys.
+ * @param ciphertext The result of enciphering.
+ */
+void KalynaEncipher(uint64_t* plaintext, kalyna_t* ctx, uint64_t* ciphertext);
+
+/*!
+ * Decipher ciphertext using Kalyna symmetric block cipher.
+ * KalynaInit() function with appropriate block and enciphering key sizes must
+ * be called beforehand to get the cipher context `ctx`. After all enciphering
+ * is completed KalynaDelete() must be called to free up allocated memory.
+ *
+ * @param ciphertext Enciphered data of length Nb words.
+ * @param ctx Initialized cipher context with precomputed round keys.
+ * @param plaintext The result of deciphering.
+ */
+void KalynaDecipher(uint64_t* ciphertext, kalyna_t* ctx, uint64_t* plaintext);
+
+#endif  /* KALYNA_H */
+