#ifndef __HAVAL_H
#define __HAVAL_H

#include <stddef.h>

#ifndef USUAL_TYPES
  #define USUAL_TYPES
  typedef unsigned char  byte;
  typedef unsigned short  word16;
  typedef unsigned long  word32;
#endif /* ?USUAL_TYPES */
  
typedef struct {
  word16 passes, hashLength;  /* HAVAL parameters */
  word32 digest[8];      /* message digest (fingerprint) */
  byte   block[128];      /* context data block */
  size_t occupied;      /* number of occupied bytes in the data block */
  word32 bitCount[2];      /* 64-bit message bit count */
  word32 temp[8];        /* temporary buffer */
} havalContext;


int havalInit (havalContext *hcp, int passes, int length);
  /* Initialize a HAVAL hashing context according to the desired  */
  /* number of passes and hash length.  Returns:          */
  /* 0: no error.                          */
  /* 1: hcp is NULL.                        */
  /* 2: invalid number of passes (must be 3, 4, or 5).      */
  /* 3: invalid hash length (must be 128, 160, 192, 224, or 256).  */
  
int havalUpdate (havalContext *hcp, const byte *dataBuffer, size_t dataLength);
  /* Updates a HAVAL hashing context with a data block dataBuffer  */
  /* of length dataLength.  Returns:                */
  /* 0: no error.                          */
  /* 1: hcp is NULL.                        */
  
int havalFinal (havalContext *hcp, byte *digest);
  /* Finished evaluation of a HAVAL digest, clearing the context.  */
  /* The digest buffer must be large enough to hold the desired  */
  /* hash length.  Returns:                    */
  /* 0: no error.                          */
  /* 1: hcp is NULL.                        */
  /* 2: digest is NULL.                      */

#endif /* __HAVAL_H */