#ifndef CIPHER_H
#define CIPHER_H
 
#ifdef __cplusplus
extern "C"
{
#endif
 
#include <stdint.h>
 
/* size of key */
#define KEY_SIZE 256
 
typedef struct
{
  char       *out;              /* pointer to output buffer */
  char        cipher[KEY_SIZE]; /* cipher used for decryption */
  uint32_t    ret;              /* internal */
  uint32_t    off1;             /* internal */
  uint32_t    off2;             /* internal */
  uint32_t    prepend_hashkey;  /* use for omit prepending a hashkey */
  uint32_t    unused;
} ctx_t;
 
/*
 * returns number of initialized cipher values
 * that's always KEY_SIZE (=256)
 */
extern int CipherInit(ctx_t *ctx);
 
/*
 * returns number of "decrypted" bytes written to output buffer
 * NOTE: that's in_len+1 on first run (hashkey will be prepended)
 *       and in_len for the rest
 */
extern uint32_t CipherUpdate(ctx_t *ctx, const char *in_data, uint32_t in_len);
 
#ifdef __cplusplus
}
#endif
 
#endif