141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/*-
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* Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* Copyright (c) 2015 Allan Jude <allanjude@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <stdio.h>
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#include <string.h>
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#include <strings.h>
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#include "geliboot_internal.h"
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#include "geliboot.h"
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int
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geliboot_crypt(u_int algo, int enc, u_char *data, size_t datasize,
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const u_char *key, size_t keysize, u_char *iv)
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{
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keyInstance aeskey;
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cipherInstance cipher;
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struct aes_xts_ctx xtsctx, *ctxp;
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size_t xts_len;
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int err, blks, i;
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switch (algo) {
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case CRYPTO_AES_CBC:
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err = rijndael_makeKey(&aeskey, !enc, keysize,
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(const char *)key);
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if (err < 0) {
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printf("Failed to setup decryption keys: %d\n", err);
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return (err);
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}
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err = rijndael_cipherInit(&cipher, MODE_CBC, iv);
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if (err < 0) {
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printf("Failed to setup IV: %d\n", err);
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return (err);
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}
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switch (enc) {
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case 0: /* decrypt */
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blks = rijndael_blockDecrypt(&cipher, &aeskey, data,
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datasize * 8, data);
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break;
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case 1: /* encrypt */
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blks = rijndael_blockEncrypt(&cipher, &aeskey, data,
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datasize * 8, data);
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break;
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}
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if (datasize != (blks / 8)) {
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printf("Failed to decrypt the entire input: "
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"%u != %u\n", blks, datasize);
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return (1);
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}
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break;
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case CRYPTO_AES_XTS:
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xts_len = keysize << 1;
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ctxp = &xtsctx;
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rijndael_set_key(&ctxp->key1, key, xts_len / 2);
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rijndael_set_key(&ctxp->key2, key + (xts_len / 16), xts_len / 2);
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enc_xform_aes_xts.reinit((caddr_t)ctxp, iv);
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switch (enc) {
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case 0: /* decrypt */
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for (i = 0; i < datasize; i += AES_XTS_BLOCKSIZE) {
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enc_xform_aes_xts.decrypt((caddr_t)ctxp, data + i);
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}
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break;
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case 1: /* encrypt */
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for (i = 0; i < datasize; i += AES_XTS_BLOCKSIZE) {
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enc_xform_aes_xts.encrypt((caddr_t)ctxp, data + i);
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}
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break;
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}
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break;
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default:
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printf("Unsupported crypto algorithm #%d\n", algo);
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return (1);
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}
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return (0);
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}
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static int
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g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize,
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const u_char *key, size_t keysize)
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{
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u_char iv[keysize];
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explicit_bzero(iv, sizeof(iv));
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return (geliboot_crypt(algo, enc, data, datasize, key, keysize, iv));
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}
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int
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g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
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const u_char *key, size_t keysize)
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{
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/* We prefer AES-CBC for metadata protection. */
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if (algo == CRYPTO_AES_XTS)
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algo = CRYPTO_AES_CBC;
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return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize));
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}
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int
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g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
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const u_char *key, size_t keysize)
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{
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/* We prefer AES-CBC for metadata protection. */
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if (algo == CRYPTO_AES_XTS)
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algo = CRYPTO_AES_CBC;
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return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize));
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}
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