diff options
Diffstat (limited to 'qemu/crypto/afsplit.c')
-rw-r--r-- | qemu/crypto/afsplit.c | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/qemu/crypto/afsplit.c b/qemu/crypto/afsplit.c deleted file mode 100644 index 8074913cd..000000000 --- a/qemu/crypto/afsplit.c +++ /dev/null @@ -1,158 +0,0 @@ -/* - * QEMU Crypto anti forensic information splitter - * - * Copyright (c) 2015-2016 Red Hat, Inc. - * - * Derived from cryptsetup package lib/luks1/af.c - * - * Copyright (C) 2004, Clemens Fruhwirth <clemens@endorphin.org> - * Copyright (C) 2009-2012, Red Hat, Inc. All rights reserved. - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, see <http://www.gnu.org/licenses/>. - * - */ - -#include "qemu/osdep.h" -#include "crypto/afsplit.h" -#include "crypto/random.h" - - -static void qcrypto_afsplit_xor(size_t blocklen, - const uint8_t *in1, - const uint8_t *in2, - uint8_t *out) -{ - size_t i; - for (i = 0; i < blocklen; i++) { - out[i] = in1[i] ^ in2[i]; - } -} - - -static int qcrypto_afsplit_hash(QCryptoHashAlgorithm hash, - size_t blocklen, - uint8_t *block, - Error **errp) -{ - size_t digestlen = qcrypto_hash_digest_len(hash); - - size_t hashcount = blocklen / digestlen; - size_t finallen = blocklen % digestlen; - uint32_t i; - - if (finallen) { - hashcount++; - } else { - finallen = digestlen; - } - - for (i = 0; i < hashcount; i++) { - uint8_t *out = NULL; - size_t outlen = 0; - uint32_t iv = cpu_to_be32(i); - struct iovec in[] = { - { .iov_base = &iv, - .iov_len = sizeof(iv) }, - { .iov_base = block + (i * digestlen), - .iov_len = (i == (hashcount - 1)) ? finallen : digestlen }, - }; - - if (qcrypto_hash_bytesv(hash, - in, - G_N_ELEMENTS(in), - &out, &outlen, - errp) < 0) { - return -1; - } - - assert(outlen == digestlen); - memcpy(block + (i * digestlen), out, - (i == (hashcount - 1)) ? finallen : digestlen); - g_free(out); - } - - return 0; -} - - -int qcrypto_afsplit_encode(QCryptoHashAlgorithm hash, - size_t blocklen, - uint32_t stripes, - const uint8_t *in, - uint8_t *out, - Error **errp) -{ - uint8_t *block = g_new0(uint8_t, blocklen); - size_t i; - int ret = -1; - - for (i = 0; i < (stripes - 1); i++) { - if (qcrypto_random_bytes(out + (i * blocklen), blocklen, errp) < 0) { - goto cleanup; - } - - qcrypto_afsplit_xor(blocklen, - out + (i * blocklen), - block, - block); - if (qcrypto_afsplit_hash(hash, blocklen, block, - errp) < 0) { - goto cleanup; - } - } - qcrypto_afsplit_xor(blocklen, - in, - block, - out + (i * blocklen)); - ret = 0; - - cleanup: - g_free(block); - return ret; -} - - -int qcrypto_afsplit_decode(QCryptoHashAlgorithm hash, - size_t blocklen, - uint32_t stripes, - const uint8_t *in, - uint8_t *out, - Error **errp) -{ - uint8_t *block = g_new0(uint8_t, blocklen); - size_t i; - int ret = -1; - - for (i = 0; i < (stripes - 1); i++) { - qcrypto_afsplit_xor(blocklen, - in + (i * blocklen), - block, - block); - if (qcrypto_afsplit_hash(hash, blocklen, block, - errp) < 0) { - goto cleanup; - } - } - - qcrypto_afsplit_xor(blocklen, - in + (i * blocklen), - block, - out); - - ret = 0; - - cleanup: - g_free(block); - return ret; -} |