#ifndef MD2_REF_H
#define MD2_REF_H

/***********************************************************
 * WICHTIG:
 * Diese Implementierung wurde nicht von uns geschrieben,
 * sondern zu vergleichszwechen von der Referenz übernommen.
 * Quelle: https://datatracker.ietf.org/doc/html/rfc1319
 **********************************************************/

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>

#ifndef PROTOTYPES
#define PROTOTYPES 0
#endif

/* POINTER defines a generic pointer type */
typedef unsigned char *POINTER;

/* UINT2 defines a two byte word */
typedef unsigned short int UINT2;

/* UINT4 defines a four byte word */
typedef unsigned long int UINT4;

/* PROTO_LIST is defined depending on how PROTOTYPES is defined above.
   If using PROTOTYPES, then PROTO_LIST returns the list, otherwise it
     returns an empty list.
 */
#if PROTOTYPES
#define PROTO_LIST(list) list
#else
#define PROTO_LIST(list) ()
#endif

typedef struct {
  unsigned char state[16];    /* state */
  unsigned char checksum[16]; /* checksum */
  size_t count;               /* number of bytes, modulo 16 */
  unsigned char buffer[16];   /* input buffer */
} MD2_CTX;

void MD2Init PROTO_LIST((MD2_CTX *));
void MD2Update PROTO_LIST((MD2_CTX *, unsigned char *, size_t));
void MD2Final PROTO_LIST((unsigned char[16], MD2_CTX *));

void md2_hash_ref(size_t len, const uint8_t buf[len], uint8_t out[16]);

#endif  // MD2_REF_H