incubator-nuttx/include/crypto/idgen.h

/****************************************************************************
 * include/crypto/idgen.h
 * $OpenBSD: idgen.h,v 1.3 2013/06/05 05:45:54 djm Exp $
 *
 * Copyright (c) 2008 Damien Miller <djm@mindrot.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 ****************************************************************************/

#ifndef __INCLUDE_CRYPTO_IDGEN_H_
#define __INCLUDE_CRYPTO_IDGEN_H_

#define IDGEN32_ROUNDS 31
#define IDGEN32_KEYLEN 32
#define IDGEN32_REKEY_LIMIT 0x60000000
#define IDGEN32_REKEY_TIME 600

struct idgen32_ctx
{
  u_int32_t id32_counter;
  u_int32_t id32_offset;
  u_int32_t id32_hibit;
  u_int8_t id32_key[IDGEN32_KEYLEN];
  time_t id32_rekey_time;
};

void idgen32_init(FAR struct idgen32_ctx *);
u_int32_t idgen32(FAR struct idgen32_ctx *);

#endif /* __INCLUDE_CRYPTO_IDGEN_H_ */