#ifdef HAVE_CONFIG_H
#include "config.h"
RCSID("$Id$");
#endif
#include "otp_locl.h"

#include "otp_md.h"
#include <md4.h>
#include <md5.h>
#include <sha.h>

/*
 * Compress len bytes from md into key
 */
static void
compressmd (OtpKey key, unsigned char *md, size_t len)
{
  u_char *p = key;

  memset (p, 0, OTPKEYSIZE);
  while(len) {
    *p++ ^= *md++;
    *p++ ^= *md++;
    *p++ ^= *md++;
    *p++ ^= *md++;
    len -= 4;
    if (p == key + OTPKEYSIZE)
      p = key;
  }
}

static int
otp_md_init (OtpKey key,
	     char *pwd,
	     char *seed,
	     void (*init)(void *),
	     void (*update)(void *, u_char *, size_t),
	     void (*finito)(void *, char *),
	     void *arg,
	     char *res,
	     size_t ressz)
{
  char *p;
  int len;
  int i;

  len = strlen(pwd) + strlen(seed);
  p = malloc (len + 1);
  if (p == NULL)
    return -1;
  strcpy (p, seed);
  strcat (p, pwd);
  (*init)(arg);
  (*update)(arg, p, len);
  (*finito)(arg, res);
  free (p);
  compressmd (key, res, ressz);
  return 0;
}

static int
otp_md_next (OtpKey key,
	     void (*init)(void *),
	     void (*update)(void *, u_char *, size_t),
	     void (*finito)(void *, char *),
	     void *arg,
	     char *res,
	     size_t ressz)
{
  (*init)(arg);
  (*update)(arg, key, OTPKEYSIZE);
  (*finito)(arg, res);
  compressmd (key, res, ressz);
  return 0;
}

static int
otp_md_hash (char *data,
	     size_t len,
	     void (*init)(void *),
	     void (*update)(void *, u_char *, size_t),
	     void (*finito)(void *, char *),
	     void *arg,
	     char *res,
	     size_t ressz)
{
  (*init)(arg);
  (*update)(arg, data, len);
  (*finito)(arg, res);
  return 0;
}

int
otp_md4_init (OtpKey key, char *pwd, char *seed)
{
  unsigned char res[16];
  struct md4 md4;

  return otp_md_init (key, pwd, seed,
		      (void (*)(void *))md4_init,
		      (void (*)(void *, u_char *, size_t))md4_update, 
		      (void (*)(void *, char *))md4_finito,
		      &md4, res, sizeof(res));
}

int
otp_md4_hash (char *data,
	      size_t len,
	      char *res)
{
  struct md4 md4;

  return otp_md_hash (data, len,
		      (void (*)(void *))md4_init,
		      (void (*)(void *, u_char *, size_t))md4_update, 
		      (void (*)(void *, char *))md4_finito,
		      &md4, res, 16);
}

int
otp_md4_next (OtpKey key)
{
  unsigned char res[16];
  struct md4 md4;

  return otp_md_next (key, 
		      (void (*)(void *))md4_init, 
		      (void (*)(void *, u_char *, size_t))md4_update, 
		      (void (*)(void *, char *))md4_finito,
		      &md4, res, sizeof(res));
}


int
otp_md5_init (OtpKey key, char *pwd, char *seed)
{
  unsigned char res[16];
  struct md5 md5;

  return otp_md_init (key, pwd, seed, 
		      (void (*)(void *))md5_init, 
		      (void (*)(void *, u_char *, size_t))md5_update, 
		      (void (*)(void *, char *))md5_finito,
		      &md5, res, sizeof(res));
}

int
otp_md5_hash (char *data,
	      size_t len,
	      char *res)
{
  struct md5 md5;

  return otp_md_hash (data, len,
		      (void (*)(void *))md5_init,
		      (void (*)(void *, u_char *, size_t))md5_update, 
		      (void (*)(void *, char *))md5_finito,
		      &md5, res, 16);
}

int
otp_md5_next (OtpKey key)
{
  unsigned char res[16];
  struct md5 md5;

  return otp_md_next (key, 
		      (void (*)(void *))md5_init, 
		      (void (*)(void *, u_char *, size_t))md5_update, 
		      (void (*)(void *, char *))md5_finito,
		      &md5, res, sizeof(res));
}

int
otp_sha_init (OtpKey key, char *pwd, char *seed)
{
  unsigned char res[20];
  struct sha sha;

  return otp_md_init (key, pwd, seed, 
		      (void (*)(void *))sha_init, 
		      (void (*)(void *, u_char *, size_t))sha_update, 
		      (void (*)(void *, char *))sha_finito,
		      &sha, res, sizeof(res));
}

int
otp_sha_hash (char *data,
	      size_t len,
	      char *res)
{
  struct sha sha;

  return otp_md_hash (data, len,
		      (void (*)(void *))sha_init,
		      (void (*)(void *, u_char *, size_t))sha_update, 
		      (void (*)(void *, char *))sha_finito,
		      &sha, res, 20);
}

int
otp_sha_next (OtpKey key)
{
  unsigned char res[20];
  struct sha sha;

  return otp_md_next (key, 
		      (void (*)(void *))sha_init, 
		      (void (*)(void *, u_char *, size_t))sha_update, 
		      (void (*)(void *, char *))sha_finito,
		      &sha, res, sizeof(res));
}