/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * The device /dev/cryptocop is accessible using this driver using
 * CRYPTOCOP_MAJOR (254) and minor number 0.
 */

#ifndef _UAPICRYPTOCOP_H
#define _UAPICRYPTOCOP_H

#include <linux/uio.h>


#define CRYPTOCOP_SESSION_ID_NONE (0)

typedef unsigned long long int cryptocop_session_id;

/* cryptocop ioctls */
#define ETRAXCRYPTOCOP_IOCTYPE         (250)

#define CRYPTOCOP_IO_CREATE_SESSION    _IOWR(ETRAXCRYPTOCOP_IOCTYPE, 1, struct strcop_session_op)
#define CRYPTOCOP_IO_CLOSE_SESSION     _IOW(ETRAXCRYPTOCOP_IOCTYPE, 2, struct strcop_session_op)
#define CRYPTOCOP_IO_PROCESS_OP        _IOWR(ETRAXCRYPTOCOP_IOCTYPE, 3, struct strcop_crypto_op)
#define CRYPTOCOP_IO_MAXNR             (3)

typedef enum {
	cryptocop_cipher_des = 0,
	cryptocop_cipher_3des = 1,
	cryptocop_cipher_aes = 2,
	cryptocop_cipher_m2m = 3, /* mem2mem is essentially a NULL cipher with blocklength=1 */
	cryptocop_cipher_none
} cryptocop_cipher_type;

typedef enum {
	cryptocop_digest_sha1 = 0,
	cryptocop_digest_md5 = 1,
	cryptocop_digest_none
} cryptocop_digest_type;

typedef enum {
	cryptocop_csum_le = 0,
	cryptocop_csum_be = 1,
	cryptocop_csum_none
} cryptocop_csum_type;

typedef enum {
	cryptocop_cipher_mode_ecb = 0,
	cryptocop_cipher_mode_cbc,
	cryptocop_cipher_mode_none
} cryptocop_cipher_mode;

typedef enum {
	cryptocop_3des_eee = 0,
	cryptocop_3des_eed = 1,
	cryptocop_3des_ede = 2,
	cryptocop_3des_edd = 3,
	cryptocop_3des_dee = 4,
	cryptocop_3des_ded = 5,
	cryptocop_3des_dde = 6,
	cryptocop_3des_ddd = 7
} cryptocop_3des_mode;

/* Usermode accessible (ioctl) operations. */
struct strcop_session_op{
	cryptocop_session_id    ses_id;

	cryptocop_cipher_type   cipher; /* AES, DES, 3DES, m2m, none */

	cryptocop_cipher_mode   cmode; /* ECB, CBC, none */
	cryptocop_3des_mode     des3_mode;

	cryptocop_digest_type   digest; /* MD5, SHA1, none */

	cryptocop_csum_type     csum;   /* BE, LE, none */

	unsigned char           *key;
	size_t                  keylen;
};

#define CRYPTOCOP_CSUM_LENGTH         (2)
#define CRYPTOCOP_MAX_DIGEST_LENGTH   (20)  /* SHA-1 20, MD5 16 */
#define CRYPTOCOP_MAX_IV_LENGTH       (16)  /* (3)DES==8, AES == 16 */
#define CRYPTOCOP_MAX_KEY_LENGTH      (32)

struct strcop_crypto_op{
	cryptocop_session_id ses_id;

	/* Indata. */
	unsigned char            *indata;
	size_t                   inlen; /* Total indata length. */

	/* Cipher configuration. */
	unsigned char            do_cipher:1;
	unsigned char            decrypt:1; /* 1 == decrypt, 0 == encrypt */
	unsigned char            cipher_explicit:1;
	size_t                   cipher_start;
	size_t                   cipher_len;
	/* cipher_iv is used if do_cipher and cipher_explicit and the cipher
	   mode is CBC.  The length is controlled by the type of cipher,
	   e.g. DES/3DES 8 octets and AES 16 octets. */
	unsigned char            cipher_iv[CRYPTOCOP_MAX_IV_LENGTH];
	/* Outdata. */
	unsigned char            *cipher_outdata;
	size_t                   cipher_outlen;

	/* digest configuration. */
	unsigned char            do_digest:1;
	size_t                   digest_start;
	size_t                   digest_len;
	/* Outdata.  The actual length is determined by the type of the digest. */
	unsigned char            digest[CRYPTOCOP_MAX_DIGEST_LENGTH];

	/* Checksum configuration. */
	unsigned char            do_csum:1;
	size_t                   csum_start;
	size_t                   csum_len;
	/* Outdata. */
	unsigned char            csum[CRYPTOCOP_CSUM_LENGTH];
};


#endif /* _UAPICRYPTOCOP_H */