mdw@git.distorted.org.uk Git - kalyna-python/blob - kalyna.h

   1 /*
   2
   3 Header file for the reference implementation of the Kalyna block cipher (DSTU 7624:2014), all block and key length variants
   4
   5 Authors: Ruslan Kiianchuk, Ruslan Mordvinov, Roman Oliynykov
   6
   7 */
   8
   9 #ifndef KALYNA_H
  10 #define KALYNA_H
  11
  12
  13 #include <stdlib.h>
  14 #include <string.h>
  15
  16
  17 typedef unsigned char uint8_t;
  18 typedef unsigned long long uint64_t;
  19
  20 /*!
  21  * Context to store Kalyna cipher parameters.
  22  */
  23 typedef struct {
  24     size_t nb;  /**< Number of 64-bit words in enciphering block. */
  25     size_t nk;  /**< Number of 64-bit words in key. */
  26     size_t nr;  /**< Number of enciphering rounds. */
  27     uint64_t* state;  /**< Current cipher state. */
  28     uint64_t** round_keys;  /**< Round key computed from enciphering key. */
  29 } kalyna_t;
  30
  31
  32 /*!
  33  * Initialize Kalyna parameters and create cipher context.
  34  *
  35  * @param block_size Enciphering block bit size (128, 256 or 512 bit sizes are
  36  * allowed).
  37  * @param block_size Enciphering key bit size. Must be equal or double the
  38  * block bit size.
  39  * @return Pointer to Kalyna context containing cipher instance
  40  * parameters and allocated memory for state and round keys. NULL in case of
  41  * error.
  42  */
  43 kalyna_t* KalynaInit(size_t block_size, size_t key_size);
  44
  45 /*!
  46  * Delete Kalyna cipher context and free used memory.
  47  *
  48  * @param ctx Kalyna cipher context.
  49  * @return Zero in case of success.
  50  */
  51 int KalynaDelete(kalyna_t* ctx);
  52
  53 /*!
  54  * Compute round keys given the enciphering key and store them in cipher
  55  * context `ctx`.
  56  *
  57  * @param key Kalyna enciphering key.
  58  * @param ctx Initialized cipher context.
  59  */
  60 void KalynaKeyExpand(uint64_t* key, kalyna_t* ctx);
  61
  62 /*!
  63  * Encipher plaintext using Kalyna symmetric block cipher.
  64  * KalynaInit() function with appropriate block and enciphering key sizes must
  65  * be called beforehand to get the cipher context `ctx`. After all enciphering
  66  * is completed KalynaDelete() must be called to free up allocated memory.
  67  *
  68  * @param plaintext Plaintext of length Nb words for enciphering.
  69  * @param ctx Initialized cipher context with precomputed round keys.
  70  * @param ciphertext The result of enciphering.
  71  */
  72 void KalynaEncipher(uint64_t* plaintext, kalyna_t* ctx, uint64_t* ciphertext);
  73
  74 /*!
  75  * Decipher ciphertext using Kalyna symmetric block cipher.
  76  * KalynaInit() function with appropriate block and enciphering key sizes must
  77  * be called beforehand to get the cipher context `ctx`. After all enciphering
  78  * is completed KalynaDelete() must be called to free up allocated memory.
  79  *
  80  * @param ciphertext Enciphered data of length Nb words.
  81  * @param ctx Initialized cipher context with precomputed round keys.
  82  * @param plaintext The result of deciphering.
  83  */
  84 void KalynaDecipher(uint64_t* ciphertext, kalyna_t* ctx, uint64_t* plaintext);
  85
  86 #endif  /* KALYNA_H */
  87