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/*
* Copyright (c) 2011 Alex Hornung <alex@alexhornung.com>.
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``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
* COPYRIGHT HOLDERS OR CONTRIBUTORS 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.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <crypto/cryptodev.h>

#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>

#include "tcplay.h"

static
int
getallowsoft(void)
{
int old;
size_t olen;

olen = sizeof(old);

if (sysctlbyname("kern.cryptodevallowsoft", &old, &olen, NULL, 0) < 0) {
perror("accessing sysctl kern.cryptodevallowsoft failed");
}

return old;
}

static
void
setallowsoft(int new)
{
int old;
size_t olen, nlen;

olen = nlen = sizeof(new);

if (sysctlbyname("kern.cryptodevallowsoft", &old, &olen, &new, nlen) < 0) {
perror("accessing sysctl kern.cryptodevallowsoft failed");
}
}

static
int
get_cryptodev_cipher_id(struct tc_crypto_algo *cipher)
{
if (strcmp(cipher->name, "AES-128-XTS") == 0)
return CRYPTO_AES_XTS;
else if (strcmp(cipher->name, "AES-256-XTS") == 0)
return CRYPTO_AES_XTS;
else if (strcmp(cipher->name, "TWOFISH-128-XTS") == 0)
return CRYPTO_TWOFISH_XTS;
else if (strcmp(cipher->name, "TWOFISH-256-XTS") == 0)
return CRYPTO_TWOFISH_XTS;
else if (strcmp(cipher->name, "SERPENT-128-XTS") == 0)
return CRYPTO_SERPENT_XTS;
else if (strcmp(cipher->name, "SERPENT-256-XTS") == 0)
return CRYPTO_SERPENT_XTS;
else
return -1;
}

int
syscrypt(struct tc_crypto_algo *cipher, unsigned char *key, size_t klen, unsigned char *iv,
    unsigned char *in, unsigned char *out, size_t len, int do_encrypt)
{
struct session_op session;
struct crypt_op cryp;
int cipher_id;
int cryptodev_fd = -1, fd = -1;

cipher_id = get_cryptodev_cipher_id(cipher);
if (cipher_id < 0) {
tc_log(1, "Cipher %s not found\n",
cipher->name);
return ENOENT;
}

if ((cryptodev_fd = open("/dev/crypto", O_RDWR, 0)) < 0) {
perror("Could not open /dev/crypto");
goto err;
}
if (ioctl(cryptodev_fd, CRIOGET, &fd) == -1) {
perror("CRIOGET failed");
goto err;
}
memset(&session, 0, sizeof(session));
session.cipher = cipher_id;
session.key = (caddr_t) key;
session.keylen = klen;
if (ioctl(fd, CIOCGSESSION, &session) == -1) {
perror("CIOCGSESSION failed");
goto err;
}
memset(&cryp, 0, sizeof(cryp));
cryp.ses = session.ses;
cryp.op = do_encrypt ? COP_ENCRYPT : COP_DECRYPT;
cryp.flags = 0;
cryp.len = len;
cryp.src = (caddr_t) in;
cryp.dst = (caddr_t) out;
cryp.iv = (caddr_t) iv;
cryp.mac = 0;
if (ioctl(fd, CIOCCRYPT, &cryp) == -1) {
perror("CIOCCRYPT failed");
goto err;
}
if (ioctl(fd, CIOCFSESSION, &session.ses) == -1) {
perror("CIOCFSESSION failed");
goto err;
}
close(fd);
close(cryptodev_fd);
return (0);

err:
if (fd != -1)
close(fd);
if (cryptodev_fd != -1)
close(cryptodev_fd);
return (-1);
}

int
tc_crypto_init(void)
{
int allowed;

allowed = getallowsoft();
if (allowed == 0)
setallowsoft(1);

return 0;
}

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