160 lines
4 KiB
C
160 lines
4 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#include <sys/zfs_context.h>
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#include <modes/modes.h>
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#include <sys/crypto/common.h>
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#include <sys/crypto/impl.h>
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/*
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* Initialize by setting iov_or_mp to point to the current iovec or mp,
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* and by setting current_offset to an offset within the current iovec or mp.
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*/
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void
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crypto_init_ptrs(crypto_data_t *out, void **iov_or_mp, offset_t *current_offset)
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{
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offset_t offset;
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switch (out->cd_format) {
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case CRYPTO_DATA_RAW:
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*current_offset = out->cd_offset;
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break;
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case CRYPTO_DATA_UIO: {
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uio_t *uiop = out->cd_uio;
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uintptr_t vec_idx;
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offset = out->cd_offset;
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for (vec_idx = 0; vec_idx < uiop->uio_iovcnt &&
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offset >= uiop->uio_iov[vec_idx].iov_len;
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offset -= uiop->uio_iov[vec_idx++].iov_len)
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;
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*current_offset = offset;
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*iov_or_mp = (void *)vec_idx;
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break;
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}
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} /* end switch */
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}
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/*
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* Get pointers for where in the output to copy a block of encrypted or
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* decrypted data. The iov_or_mp argument stores a pointer to the current
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* iovec or mp, and offset stores an offset into the current iovec or mp.
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*/
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void
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crypto_get_ptrs(crypto_data_t *out, void **iov_or_mp, offset_t *current_offset,
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uint8_t **out_data_1, size_t *out_data_1_len, uint8_t **out_data_2,
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size_t amt)
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{
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offset_t offset;
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switch (out->cd_format) {
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case CRYPTO_DATA_RAW: {
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iovec_t *iov;
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offset = *current_offset;
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iov = &out->cd_raw;
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if ((offset + amt) <= iov->iov_len) {
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/* one block fits */
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*out_data_1 = (uint8_t *)iov->iov_base + offset;
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*out_data_1_len = amt;
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*out_data_2 = NULL;
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*current_offset = offset + amt;
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}
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break;
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}
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case CRYPTO_DATA_UIO: {
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uio_t *uio = out->cd_uio;
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iovec_t *iov;
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offset_t offset;
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uintptr_t vec_idx;
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uint8_t *p;
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offset = *current_offset;
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vec_idx = (uintptr_t)(*iov_or_mp);
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iov = (iovec_t *)&uio->uio_iov[vec_idx];
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p = (uint8_t *)iov->iov_base + offset;
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*out_data_1 = p;
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if (offset + amt <= iov->iov_len) {
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/* can fit one block into this iov */
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*out_data_1_len = amt;
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*out_data_2 = NULL;
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*current_offset = offset + amt;
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} else {
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/* one block spans two iovecs */
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*out_data_1_len = iov->iov_len - offset;
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if (vec_idx == uio->uio_iovcnt)
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return;
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vec_idx++;
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iov = (iovec_t *)&uio->uio_iov[vec_idx];
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*out_data_2 = (uint8_t *)iov->iov_base;
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*current_offset = amt - *out_data_1_len;
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}
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*iov_or_mp = (void *)vec_idx;
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break;
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}
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} /* end switch */
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}
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void
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crypto_free_mode_ctx(void *ctx)
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{
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common_ctx_t *common_ctx = (common_ctx_t *)ctx;
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switch (common_ctx->cc_flags &
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(ECB_MODE|CBC_MODE|CTR_MODE|CCM_MODE|GCM_MODE|GMAC_MODE)) {
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case ECB_MODE:
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kmem_free(common_ctx, sizeof (ecb_ctx_t));
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break;
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case CBC_MODE:
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kmem_free(common_ctx, sizeof (cbc_ctx_t));
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break;
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case CTR_MODE:
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kmem_free(common_ctx, sizeof (ctr_ctx_t));
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break;
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case CCM_MODE:
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if (((ccm_ctx_t *)ctx)->ccm_pt_buf != NULL)
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vmem_free(((ccm_ctx_t *)ctx)->ccm_pt_buf,
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((ccm_ctx_t *)ctx)->ccm_data_len);
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kmem_free(ctx, sizeof (ccm_ctx_t));
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break;
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case GCM_MODE:
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case GMAC_MODE:
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if (((gcm_ctx_t *)ctx)->gcm_pt_buf != NULL)
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vmem_free(((gcm_ctx_t *)ctx)->gcm_pt_buf,
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((gcm_ctx_t *)ctx)->gcm_pt_buf_len);
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kmem_free(ctx, sizeof (gcm_ctx_t));
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}
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}
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