2 * Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * Copyright (c) 2015 Allan Jude <allanjude@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "geliboot_internal.h"
38 geliboot_crypt(u_int algo, int enc, u_char *data, size_t datasize,
39 const u_char *key, size_t keysize, u_char *iv)
42 cipherInstance cipher;
43 struct aes_xts_ctx xtsctx, *ctxp;
49 err = rijndael_makeKey(&aeskey, !enc, keysize,
52 printf("Failed to setup decryption keys: %d\n", err);
56 err = rijndael_cipherInit(&cipher, MODE_CBC, iv);
58 printf("Failed to setup IV: %d\n", err);
64 blks = rijndael_blockDecrypt(&cipher, &aeskey, data,
68 blks = rijndael_blockEncrypt(&cipher, &aeskey, data,
72 if (datasize != (blks / 8)) {
73 printf("Failed to decrypt the entire input: "
74 "%u != %u\n", blks, datasize);
79 xts_len = keysize << 1;
82 rijndael_set_key(&ctxp->key1, key, xts_len / 2);
83 rijndael_set_key(&ctxp->key2, key + (xts_len / 16), xts_len / 2);
85 enc_xform_aes_xts.reinit((caddr_t)ctxp, iv);
89 for (i = 0; i < datasize; i += AES_XTS_BLOCKSIZE) {
90 enc_xform_aes_xts.decrypt((caddr_t)ctxp, data + i);
94 for (i = 0; i < datasize; i += AES_XTS_BLOCKSIZE) {
95 enc_xform_aes_xts.encrypt((caddr_t)ctxp, data + i);
101 printf("Unsupported crypto algorithm #%d\n", algo);
109 g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
110 const u_char *key, size_t keysize)
114 explicit_bzero(iv, sizeof(iv));
115 return (geliboot_crypt(algo, enc, data, datasize, key, keysize, iv));
119 g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
120 const u_char *key, size_t keysize)
123 /* We prefer AES-CBC for metadata protection. */
124 if (algo == CRYPTO_AES_XTS)
125 algo = CRYPTO_AES_CBC;
127 return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize));
131 g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
132 const u_char *key, size_t keysize)
135 /* We prefer AES-CBC for metadata protection. */
136 if (algo == CRYPTO_AES_XTS)
137 algo = CRYPTO_AES_CBC;
139 return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize));