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/*
* Copyright 1999 Niels Provos <provos@citi.umich.edu>
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Niels Provos.
* 4. 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <dev/rndvar.h>
#include <netinet/ip_blf.h>
#include <uvm/uvm_swap_encrypt.h>
blf_ctx swap_key;
int uvm_doswapencrypt = 0;
int swap_encrypt_initalized = 0;
/*
* Initalize the key from the kernel random number generator. This is
* done once on startup.
*/
void
swap_encrypt_init(caddr_t data, size_t len)
{
int i;
u_int32_t *key = (u_int32_t *)data;
if (swap_encrypt_initalized)
return;
for (i = 0; i < len / sizeof(u_int32_t); i++)
*key++ = arc4random();
swap_encrypt_initalized = 1;
}
/*
* Encrypt the data before it goes to swap, the size should be 64-bit
* aligned.
*/
void
swap_encrypt(caddr_t src, caddr_t dst, size_t count)
{
u_int32_t *dsrc = (u_int32_t *)src;
u_int32_t *ddst = (u_int32_t *)dst;
u_int32_t iv1, iv2;
if (!swap_encrypt_initalized)
swap_encrypt_init((caddr_t)&swap_key, sizeof(swap_key));
count /= sizeof(u_int32_t);
iv1 = iv2 = 0;
for (; count > 0; count -= 2) {
ddst[0] = dsrc[0] ^ iv1;
ddst[1] = dsrc[1] ^ iv2;
/*
* Do not worry about endianess, it only needs to decrypt on this machine
*/
Blowfish_encipher(&swap_key, ddst);
iv1 = ddst[0];
iv2 = ddst[1];
dsrc += 2;
ddst += 2;
}
}
/*
* Decrypt the data after we retrieved it from swap, the size should be 64-bit
* aligned.
*/
void
swap_decrypt(caddr_t src, caddr_t dst, size_t count)
{
u_int32_t *dsrc = (u_int32_t *)src;
u_int32_t *ddst = (u_int32_t *)dst;
u_int32_t iv1, iv2, niv1, niv2;
if (!swap_encrypt_initalized)
panic("swap_decrypt: key not initalized");
count /= sizeof(u_int32_t);
iv1 = iv2 = 0;
for (; count > 0; count -= 2) {
ddst[0] = niv1 = dsrc[0];
ddst[1] = niv2 = dsrc[1];
Blowfish_decipher(&swap_key, ddst);
ddst[0] ^= iv1;
ddst[1] ^= iv2;
iv1 = niv1;
iv2 = niv2;
dsrc += 2;
ddst += 2;
}
}
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