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// SPDX-License-Identifier: CDDL-1.0
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/zfs_context.h>
#include <modes/modes.h>
#include <sys/crypto/common.h>
#include <sys/crypto/impl.h>
/*
* Initialize by setting iov_or_mp to point to the current iovec or mp,
* and by setting current_offset to an offset within the current iovec or mp.
*/
void
crypto_init_ptrs(crypto_data_t *out, void **iov_or_mp, offset_t *current_offset)
{
offset_t offset;
switch (out->cd_format) {
case CRYPTO_DATA_RAW:
*current_offset = out->cd_offset;
break;
case CRYPTO_DATA_UIO: {
zfs_uio_t *uiop = out->cd_uio;
uint_t vec_idx;
offset = out->cd_offset;
offset = zfs_uio_index_at_offset(uiop, offset, &vec_idx);
*current_offset = offset;
*iov_or_mp = (void *)(uintptr_t)vec_idx;
break;
}
} /* end switch */
}
/*
* Get pointers for where in the output to copy a block of encrypted or
* decrypted data. The iov_or_mp argument stores a pointer to the current
* iovec or mp, and offset stores an offset into the current iovec or mp.
*/
void
crypto_get_ptrs(crypto_data_t *out, void **iov_or_mp, offset_t *current_offset,
uint8_t **out_data_1, size_t *out_data_1_len, uint8_t **out_data_2,
size_t amt)
{
offset_t offset;
switch (out->cd_format) {
case CRYPTO_DATA_RAW: {
iovec_t *iov;
offset = *current_offset;
iov = &out->cd_raw;
if ((offset + amt) <= iov->iov_len) {
/* one block fits */
*out_data_1 = (uint8_t *)iov->iov_base + offset;
*out_data_1_len = amt;
*out_data_2 = NULL;
*current_offset = offset + amt;
}
break;
}
case CRYPTO_DATA_UIO: {
zfs_uio_t *uio = out->cd_uio;
offset_t offset;
uint_t vec_idx;
uint8_t *p;
uint64_t iov_len;
void *iov_base;
offset = *current_offset;
vec_idx = (uintptr_t)(*iov_or_mp);
zfs_uio_iov_at_index(uio, vec_idx, &iov_base, &iov_len);
p = (uint8_t *)iov_base + offset;
*out_data_1 = p;
if (offset + amt <= iov_len) {
/* can fit one block into this iov */
*out_data_1_len = amt;
*out_data_2 = NULL;
*current_offset = offset + amt;
} else {
/* one block spans two iovecs */
*out_data_1_len = iov_len - offset;
if (vec_idx == zfs_uio_iovcnt(uio)) {
*out_data_2 = NULL;
return;
}
vec_idx++;
zfs_uio_iov_at_index(uio, vec_idx, &iov_base, &iov_len);
*out_data_2 = (uint8_t *)iov_base;
*current_offset = amt - *out_data_1_len;
}
*iov_or_mp = (void *)(uintptr_t)vec_idx;
break;
}
} /* end switch */
}
void
crypto_free_mode_ctx(void *ctx)
{
common_ctx_t *common_ctx = (common_ctx_t *)ctx;
switch (common_ctx->cc_flags & (CCM_MODE|GCM_MODE)) {
case CCM_MODE:
if (((ccm_ctx_t *)ctx)->ccm_pt_buf != NULL)
vmem_free(((ccm_ctx_t *)ctx)->ccm_pt_buf,
((ccm_ctx_t *)ctx)->ccm_data_len);
kmem_free(ctx, sizeof (ccm_ctx_t));
break;
case GCM_MODE:
gcm_clear_ctx((gcm_ctx_t *)ctx);
kmem_free(ctx, sizeof (gcm_ctx_t));
break;
default:
__builtin_unreachable();
}
}
static void *
explicit_memset(void *s, int c, size_t n)
{
memset(s, c, n);
__asm__ __volatile__("" :: "r"(s) : "memory");
return (s);
}
/*
* Clear sensitive data in the context and free allocated memory.
*
* ctx->gcm_remainder may contain a plaintext remainder. ctx->gcm_H and
* ctx->gcm_Htable contain the hash sub key which protects authentication.
* ctx->gcm_pt_buf contains the plaintext result of decryption.
*
* Although extremely unlikely, ctx->gcm_J0 and ctx->gcm_tmp could be used for
* a known plaintext attack, they consist of the IV and the first and last
* counter respectively. If they should be cleared is debatable.
*/
void
gcm_clear_ctx(gcm_ctx_t *ctx)
{
explicit_memset(ctx->gcm_remainder, 0, sizeof (ctx->gcm_remainder));
explicit_memset(ctx->gcm_H, 0, sizeof (ctx->gcm_H));
#if defined(CAN_USE_GCM_ASM)
if (ctx->gcm_use_avx == B_TRUE) {
ASSERT3P(ctx->gcm_Htable, !=, NULL);
explicit_memset(ctx->gcm_Htable, 0, ctx->gcm_htab_len);
kmem_free(ctx->gcm_Htable, ctx->gcm_htab_len);
}
#endif
if (ctx->gcm_pt_buf != NULL) {
explicit_memset(ctx->gcm_pt_buf, 0, ctx->gcm_pt_buf_len);
vmem_free(ctx->gcm_pt_buf, ctx->gcm_pt_buf_len);
}
/* Optional */
explicit_memset(ctx->gcm_J0, 0, sizeof (ctx->gcm_J0));
explicit_memset(ctx->gcm_tmp, 0, sizeof (ctx->gcm_tmp));
}
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