dm-crypt.c (5ef26e966d3fd105ad9a7e8e8f6d12c7fbd4c03d) dm-crypt.c (45fe93dff2fb58b22de04c729f8447ba0f773d93)
1/*
2 * Copyright (C) 2003 Jana Saout <jana@saout.de>
3 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
4 * Copyright (C) 2006-2017 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2013-2017 Milan Broz <gmazyland@gmail.com>
6 *
7 * This file is released under the GPL.
8 */

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753{
754 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
755 __le64 sector = cpu_to_le64(dmreq->iv_sector);
756 u8 buf[TCW_WHITENING_SIZE];
757 SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm);
758 int i, r;
759
760 /* xor whitening with sector number */
1/*
2 * Copyright (C) 2003 Jana Saout <jana@saout.de>
3 * Copyright (C) 2004 Clemens Fruhwirth <clemens@endorphin.org>
4 * Copyright (C) 2006-2017 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2013-2017 Milan Broz <gmazyland@gmail.com>
6 *
7 * This file is released under the GPL.
8 */

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753{
754 struct iv_tcw_private *tcw = &cc->iv_gen_private.tcw;
755 __le64 sector = cpu_to_le64(dmreq->iv_sector);
756 u8 buf[TCW_WHITENING_SIZE];
757 SHASH_DESC_ON_STACK(desc, tcw->crc32_tfm);
758 int i, r;
759
760 /* xor whitening with sector number */
761 memcpy(buf, tcw->whitening, TCW_WHITENING_SIZE);
762 crypto_xor(buf, (u8 *)&sector, 8);
763 crypto_xor(&buf[8], (u8 *)&sector, 8);
761 crypto_xor_cpy(buf, tcw->whitening, (u8 *)&sector, 8);
762 crypto_xor_cpy(&buf[8], tcw->whitening + 8, (u8 *)&sector, 8);
764
765 /* calculate crc32 for every 32bit part and xor it */
766 desc->tfm = tcw->crc32_tfm;
767 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
768 for (i = 0; i < 4; i++) {
769 r = crypto_shash_init(desc);
770 if (r)
771 goto out;

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800 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
801 sg = crypt_get_sg_data(cc, dmreq->sg_in);
802 src = kmap_atomic(sg_page(sg));
803 r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset);
804 kunmap_atomic(src);
805 }
806
807 /* Calculate IV */
763
764 /* calculate crc32 for every 32bit part and xor it */
765 desc->tfm = tcw->crc32_tfm;
766 desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
767 for (i = 0; i < 4; i++) {
768 r = crypto_shash_init(desc);
769 if (r)
770 goto out;

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799 if (bio_data_dir(dmreq->ctx->bio_in) != WRITE) {
800 sg = crypt_get_sg_data(cc, dmreq->sg_in);
801 src = kmap_atomic(sg_page(sg));
802 r = crypt_iv_tcw_whitening(cc, dmreq, src + sg->offset);
803 kunmap_atomic(src);
804 }
805
806 /* Calculate IV */
808 memcpy(iv, tcw->iv_seed, cc->iv_size);
809 crypto_xor(iv, (u8 *)&sector, 8);
807 crypto_xor_cpy(iv, tcw->iv_seed, (u8 *)&sector, 8);
810 if (cc->iv_size > 8)
808 if (cc->iv_size > 8)
811 crypto_xor(&iv[8], (u8 *)&sector, cc->iv_size - 8);
809 crypto_xor_cpy(&iv[8], tcw->iv_seed + 8, (u8 *)&sector,
810 cc->iv_size - 8);
812
813 return r;
814}
815
816static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
817 struct dm_crypt_request *dmreq)
818{
819 struct scatterlist *sg;

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812 return r;
813}
814
815static int crypt_iv_tcw_post(struct crypt_config *cc, u8 *iv,
816 struct dm_crypt_request *dmreq)
817{
818 struct scatterlist *sg;

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