140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/*-
|
|
* Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
|
|
* Copyright (c) 2015 Allan Jude <allanjude@FreeBSD.org>
|
|
* 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 AUTHORS 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 AUTHORS 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <strings.h>
|
|
|
|
#include "geliboot.h"
|
|
|
|
int
|
|
geliboot_crypt(u_int algo, int enc, u_char *data, size_t datasize,
|
|
const u_char *key, size_t keysize, u_char *iv)
|
|
{
|
|
keyInstance aeskey;
|
|
cipherInstance cipher;
|
|
struct aes_xts_ctx xtsctx, *ctxp;
|
|
size_t xts_len;
|
|
int err, blks, i;
|
|
|
|
switch (algo) {
|
|
case CRYPTO_AES_CBC:
|
|
err = rijndael_makeKey(&aeskey, !enc, keysize,
|
|
(const char *)key);
|
|
if (err < 0) {
|
|
printf("Failed to setup decryption keys: %d\n", err);
|
|
return (err);
|
|
}
|
|
|
|
err = rijndael_cipherInit(&cipher, MODE_CBC, iv);
|
|
if (err < 0) {
|
|
printf("Failed to setup IV: %d\n", err);
|
|
return (err);
|
|
}
|
|
|
|
switch (enc) {
|
|
case 0: /* decrypt */
|
|
blks = rijndael_blockDecrypt(&cipher, &aeskey, data,
|
|
datasize * 8, data);
|
|
break;
|
|
case 1: /* encrypt */
|
|
blks = rijndael_blockEncrypt(&cipher, &aeskey, data,
|
|
datasize * 8, data);
|
|
break;
|
|
}
|
|
if (datasize != (blks / 8)) {
|
|
printf("Failed to decrypt the entire input: "
|
|
"%u != %u\n", blks, datasize);
|
|
return (1);
|
|
}
|
|
break;
|
|
case CRYPTO_AES_XTS:
|
|
xts_len = keysize << 1;
|
|
ctxp = &xtsctx;
|
|
|
|
rijndael_set_key(&ctxp->key1, key, xts_len / 2);
|
|
rijndael_set_key(&ctxp->key2, key + (xts_len / 16), xts_len / 2);
|
|
|
|
enc_xform_aes_xts.reinit(ctxp, iv);
|
|
|
|
switch (enc) {
|
|
case 0: /* decrypt */
|
|
for (i = 0; i < datasize; i += AES_XTS_BLOCKSIZE) {
|
|
enc_xform_aes_xts.decrypt(ctxp, data + i);
|
|
}
|
|
break;
|
|
case 1: /* encrypt */
|
|
for (i = 0; i < datasize; i += AES_XTS_BLOCKSIZE) {
|
|
enc_xform_aes_xts.encrypt(ctxp, data + i);
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
printf("Unsupported crypto algorithm #%d\n", algo);
|
|
return (1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
|
|
const u_char *key, size_t keysize)
|
|
{
|
|
u_char iv[keysize];
|
|
|
|
bzero(iv, sizeof(iv));
|
|
return (geliboot_crypt(algo, enc, data, datasize, key, keysize, iv));
|
|
}
|
|
|
|
int
|
|
g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
|
|
const u_char *key, size_t keysize)
|
|
{
|
|
|
|
/* We prefer AES-CBC for metadata protection. */
|
|
if (algo == CRYPTO_AES_XTS)
|
|
algo = CRYPTO_AES_CBC;
|
|
|
|
return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize));
|
|
}
|
|
|
|
int
|
|
g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
|
|
const u_char *key, size_t keysize)
|
|
{
|
|
|
|
/* We prefer AES-CBC for metadata protection. */
|
|
if (algo == CRYPTO_AES_XTS)
|
|
algo = CRYPTO_AES_CBC;
|
|
|
|
return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize));
|
|
}
|