/*	$OpenBSD: key.c,v 1.12 2002/09/11 09:50:44 ho Exp $	*/
/*
 * The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu)
 *
 * Copyright (c) 2000-2001 Angelos D. Keromytis.
 *
 * Permission to use, copy, and modify this software with or without fee
 * is hereby granted, provided that this entire notice is included in
 * all copies of any software which is or includes a copy or
 * modification of this software.
 * You may use this code under the GNU public license if you so wish. Please
 * contribute changes back to the authors under this freer than GPL license
 * so that we may further the use of strong encryption without limitations to
 * all.
 *
 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
 * PURPOSE.
 */

#include <string.h>

#include "sysdep.h"

#include "key.h"
#include "libcrypto.h"
#include "log.h"
#include "util.h"
#include "x509.h"

void
key_free (int type, int private, void *key)
{
  switch (type)
    {
    case ISAKMP_KEY_PASSPHRASE:
      free (key);
      break;
    case ISAKMP_KEY_RSA:
      RSA_free (key);
      break;
    case ISAKMP_KEY_NONE:
    default:
      log_error ("key_free: unknown/unsupportedkey type %d", type);
      break;
    }
}

/* Convert from internal form to serialized */
void
key_serialize (int type, int private, void *key, u_int8_t **data, size_t *datalen)
{
  u_int8_t *p;

  switch (type)
    {
    case ISAKMP_KEY_PASSPHRASE:
      *datalen = strlen ((char *)key);
      *data = (u_int8_t *)strdup ((char *)key);
      break;
    case ISAKMP_KEY_RSA:
      switch (private)
	{
	case ISAKMP_KEYTYPE_PUBLIC:
	  *datalen = i2d_RSAPublicKey ((RSA *)key, NULL);
	  *data = p = malloc (*datalen);
	  if (!p)
	    {
	      log_error("key_serialize: malloc (%lu) failed",
		(unsigned long)*datalen);
	      return;
	    }
	  *datalen = i2d_RSAPublicKey ((RSA *)key, &p);
	  break;

	case ISAKMP_KEYTYPE_PRIVATE:
	  *datalen = i2d_RSAPrivateKey ((RSA *)key, NULL);
	  *data = p = malloc (*datalen);
	  if (!p)
	    {
	      log_error("key_serialize: malloc (%lu) failed",
		(unsigned long)*datalen);
	      return;
	    }
	  *datalen = i2d_RSAPrivateKey ((RSA *)key, &p);
	  break;
	}
      break;
    default:
      log_error ("key_serialize: unknown/unsupported key type %d", type);
      break;
    }
}

/* Convert from serialized to printable */
char *
key_printable (int type, int private, u_int8_t *data, int datalen)
{
  char *s;
  int i;

  switch (type)
    {
    case ISAKMP_KEY_PASSPHRASE:
      return strdup ((char *)data);

    case ISAKMP_KEY_RSA:
      s = malloc (datalen * 2 + 1);
      if (!s)
	{
	  log_error ("key_printable: malloc (%d) failed", datalen * 2 + 1);
	  return 0;
	}
      for (i = 0; i < datalen; i++)
	snprintf (s + (2 * i), 2 * (datalen - i) + 1, "%02x", data[i]);
      return s;

    default:
      log_error ("key_printable: unknown/unsupported key type %d", type);
      return 0;
    }
}

/* Convert from serialized to internal.  */
void *
key_internalize (int type, int private, u_int8_t *data, int datalen)
{
  switch (type)
    {
    case ISAKMP_KEY_PASSPHRASE:
      return strdup ((char *)data);
    case ISAKMP_KEY_RSA:
      switch (private)
	{
#if OPENSSL_VERSION_NUMBER >= 0x00907000L
	case ISAKMP_KEYTYPE_PUBLIC:
	  return d2i_RSAPublicKey (NULL, (const u_int8_t **)&data, datalen);
	case ISAKMP_KEYTYPE_PRIVATE:
	  return d2i_RSAPrivateKey (NULL, (const u_int8_t **)&data, datalen);
#else
	case ISAKMP_KEYTYPE_PUBLIC:
	  return d2i_RSAPublicKey (NULL, &data, datalen);
	case ISAKMP_KEYTYPE_PRIVATE:
	  return d2i_RSAPrivateKey (NULL, &data, datalen);
#endif
	default:
	  log_error ("key_internalize: not public or private RSA key passed");
	  return 0;
	}
      break;
    default:
      log_error ("key_internalize: unknown/unsupported key type %d", type);
      break;
    }

  return 0;
}

/* Convert from printable to serialized */
void
key_from_printable (int type, int private, char *key, u_int8_t **data,
		    u_int32_t *datalen)
{
  switch (type)
    {
    case ISAKMP_KEY_PASSPHRASE:
      *datalen = strlen (key);
      *data = (u_int8_t *)strdup (key);
      break;

    case ISAKMP_KEY_RSA:
      *datalen = (strlen (key) + 1) / 2; /* Round up, just in case */
      *data = malloc (*datalen);
      if (!*data)
	{
	  log_error ("key_from_printable: malloc (%d) failed", *datalen);
	  return;
	}
      *datalen = hex2raw (key, *data, *datalen);
      break;

    default:
      log_error ("key_from_printable: unknown/unsupported key type %d", type);
      break;
    }
}