62bd02cee5
Reduce by 1 the number of crazy libraries we need in stand by moving geli into libsa (where architecturally it belonged all along). This just moves things around without any code changes.
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 != %zu\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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