/*	$OpenBSD: cryptodev.h,v 1.4 2001/06/23 18:30:36 deraadt Exp $	*/

/*
 * The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu)
 *
 * This code was written by Angelos D. Keromytis in Athens, Greece, in
 * February 2000. Network Security Technologies Inc. (NSTI) kindly
 * supported the development of this code.
 *
 * Copyright (c) 2000 Angelos D. Keromytis
 *
 * Permission to use, copy, and modify this software without fee
 * is hereby granted, provided that this entire notice is included in
 * all source code copies of any software which is or includes a copy or
 * modification of this software. 
 *
 * 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.
 *
 * Copyright (c) 2001 Theo de Raadt
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _CRYPTO_CRYPTO_H_
#define _CRYPTO_CRYPTO_H_

#include <sys/ioccom.h>

/* Some initial values */
#define CRYPTO_DRIVERS_INITIAL	4
#define CRYPTO_SW_SESSIONS	32

/* HMAC values */
#define HMAC_BLOCK_LEN		64
#define HMAC_IPAD_VAL		0x36
#define HMAC_OPAD_VAL		0x5C

/* Encryption algorithm block sizes */
#define DES_BLOCK_LEN		8
#define DES3_BLOCK_LEN		8
#define BLOWFISH_BLOCK_LEN	8
#define SKIPJACK_BLOCK_LEN	8
#define CAST128_BLOCK_LEN	8
#define RIJNDAEL128_BLOCK_LEN	16
#define EALG_MAX_BLOCK_LEN	16 /* Keep this updated */

/* Maximum hash algorithm result length */
#define AALG_MAX_RESULT_LEN	20 /* Keep this updated */

#define CRYPTO_DES_CBC		1
#define CRYPTO_3DES_CBC		2
#define CRYPTO_BLF_CBC		3
#define CRYPTO_CAST_CBC		4
#define CRYPTO_SKIPJACK_CBC	5
#define CRYPTO_MD5_HMAC		6
#define CRYPTO_SHA1_HMAC	7
#define CRYPTO_RIPEMD160_HMAC	8
#define CRYPTO_MD5_KPDK		9
#define CRYPTO_SHA1_KPDK	10
#define CRYPTO_RIJNDAEL128_CBC	11 /* 128 bit blocksize */
#define CRYPTO_AES_CBC		11 /* 128 bit blocksize -- the same as above */

#define CRYPTO_ALGORITHM_MAX	11 /* Keep this updated */

/* Standard initialization structure beginning */
struct cryptoini {
	int		cri_alg;	/* Algorithm to use */
	int		cri_klen;	/* Key length, in bits */
	int		cri_rnd;	/* Algorithm rounds, where relevant */
	caddr_t		cri_key;	/* key to use */
	u_int8_t	cri_iv[EALG_MAX_BLOCK_LEN];	/* IV to use */
	struct cryptoini *cri_next;
};

/* Describe boundaries of a single crypto operation */
struct cryptodesc {
	int		crd_skip;	/* How many bytes to ignore from start */
	int		crd_len;	/* How many bytes to process */
	int		crd_inject;	/* Where to inject results, if applicable */
	int		crd_flags;

#define CRD_F_ENCRYPT		0x1	/* Set when doing encryption */
#define CRD_F_IV_PRESENT	0x2	/* When encrypting, IV is already in
					   place, so don't copy. */
#define CRD_F_IV_EXPLICIT	0x4	/* IV explicitly provided */

	struct cryptoini	CRD_INI; /* Initialization/context data */
#define crd_iv		CRD_INI.cri_iv
#define crd_key		CRD_INI.cri_key
#define crd_rnd		CRD_INI.cri_rnd
#define crd_alg		CRD_INI.cri_alg
#define crd_klen	CRD_INI.cri_klen

	struct cryptodesc *crd_next;
};

/* Structure describing complete operation */
struct cryptop {
	u_int64_t	crp_sid;	/* Session ID */
	int		crp_ilen;	/* Input data total length */
	int		crp_olen;	/* Result total length (unused for now) */
	int		crp_alloctype;	/* Type of buf to allocate if needed */

	int		crp_etype;	/*
					 * Error type (zero means no error).
					 * All error codes except EAGAIN
					 * indicate possible data corruption (as in,
					 * the data have been touched). On all
					 * errors, the crp_sid may have changed
					 * (reset to a new one), so the caller
					 * should always check and use the new
					 * value on future requests.
					 */
	int		crp_flags;

#define CRYPTO_F_IMBUF	0x0001	/* Input/output are mbuf chains, otherwise contig */
#define CRYPTO_F_IOV	0x0002	/* Input/output are uio */
#define CRYPTO_F_REL	0x0004	/* Must return data in same place */

	caddr_t		crp_buf;	/* Data to be processed */
	caddr_t		crp_opaque;	/* Opaque pointer, passed along */
	struct cryptodesc *crp_desc;	/* Linked list of processing descriptors */
	int (*crp_callback)(struct cryptop *); /* Callback function */
	struct cryptop	*crp_next;
	caddr_t		crp_iv;
	caddr_t		crp_mac;
	int		crp_mac_trunc_len;
};

#define CRYPTO_BUF_CONTIG	0x1
#define CRYPTO_BUF_MBUF		0x2

#define CRYPTO_OP_DECRYPT	0x0
#define CRYPTO_OP_ENCRYPT	0x1

/* Crypto capabilities structure */
struct cryptocap {
	u_int32_t	cc_sessions;
	u_int8_t	cc_alg[CRYPTO_ALGORITHM_MAX + 1]; /* Supported */
	u_int8_t	cc_flags;
#define CRYPTOCAP_F_CLEANUP   0x1
#define CRYPTOCAP_F_SOFTWARE  0x02

	int		(*cc_newsession) (u_int32_t *, struct cryptoini *);
	int		(*cc_process) (struct cryptop *);
	int		(*cc_freesession) (u_int64_t);
};

struct session_op {
	u_int32_t	cipher;		/* ie. CRYPTO_DES_CBC */
	u_int32_t	mac;		/* ie. CRYPTO_MD5_HMAC */

	u_int32_t	keylen;		/* cipher key */
	caddr_t		key;
	int		mackeylen;	/* mac key */
	caddr_t		mackey;

	u_int32_t	ses;		/* returns: session # */
};

struct crypt_op {
	u_int32_t	ses;
	u_int16_t	op;
	u_int16_t	flags;		/* always 0 */

	u_int		len;
	caddr_t		src, dst;	/* become iov[] inside kernel */
	caddr_t		mac;
	caddr_t		iv;
};

#define COP_ENCRYPT	1
#define COP_DECRYPT	2
/* #define COP_SETKEY	3 */
/* #define COP_GETKEY	4 */

#define	CRIOGET		_IOWR('c', 100, u_int32_t)

#define	CIOCGSESSION	_IOWR('c', 101, struct session_op)
#define	CIOCFSESSION	_IOW('c', 102, u_int32_t)
#define CIOCCRYPT	_IOWR('c', 103, struct crypt_op)


#ifdef _KERNEL
int	crypto_newsession(u_int64_t *, struct cryptoini *, int);
int	crypto_freesession(u_int64_t);
int	crypto_dispatch(struct cryptop *);
int	crypto_register(u_int32_t, int,
	    int (*)(u_int32_t *, struct cryptoini *), int (*)(u_int64_t),
	    int (*)(struct cryptop *));
int	crypto_unregister(u_int32_t, int);
int32_t	crypto_get_driverid(void);
void	crypto_thread(void);
int	crypto_invoke(struct cryptop *);
void	crypto_done(struct cryptop *);

struct mbuf;
int	mbuf2pages __P((struct mbuf *, int *, long *, int *, int, int *));
int	iov2pages __P((struct uio *, int *, long *, int *, int, int *));
void	cuio_copydata __P((struct uio *, int, int, caddr_t));
void	cuio_copyback __P((struct uio *, int, int, caddr_t));

struct	cryptop *crypto_getreq(int);
void	crypto_freereq(struct cryptop *);
#endif /* _KERNEL */
#endif /* _CRYPTO_CRYPTO_H_ */