274 lines
6.9 KiB
C
274 lines
6.9 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 2008 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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* Algorithm independent CBC functions.
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*/
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int
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cbc_encrypt_contiguous_blocks(cbc_ctx_t *ctx, char *data, size_t length,
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crypto_data_t *out, size_t block_size,
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int (*encrypt)(const void *, const uint8_t *, uint8_t *),
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void (*copy_block)(uint8_t *, uint8_t *),
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void (*xor_block)(uint8_t *, uint8_t *))
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{
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size_t remainder = length;
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size_t need = 0;
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uint8_t *datap = (uint8_t *)data;
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uint8_t *blockp;
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uint8_t *lastp;
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void *iov_or_mp;
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offset_t offset;
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uint8_t *out_data_1;
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uint8_t *out_data_2;
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size_t out_data_1_len;
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if (length + ctx->cbc_remainder_len < block_size) {
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/* accumulate bytes here and return */
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bcopy(datap,
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(uint8_t *)ctx->cbc_remainder + ctx->cbc_remainder_len,
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length);
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ctx->cbc_remainder_len += length;
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ctx->cbc_copy_to = datap;
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return (CRYPTO_SUCCESS);
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}
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lastp = (uint8_t *)ctx->cbc_iv;
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crypto_init_ptrs(out, &iov_or_mp, &offset);
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do {
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/* Unprocessed data from last call. */
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if (ctx->cbc_remainder_len > 0) {
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need = block_size - ctx->cbc_remainder_len;
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if (need > remainder)
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return (CRYPTO_DATA_LEN_RANGE);
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bcopy(datap, &((uint8_t *)ctx->cbc_remainder)
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[ctx->cbc_remainder_len], need);
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blockp = (uint8_t *)ctx->cbc_remainder;
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} else {
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blockp = datap;
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}
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/*
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* XOR the previous cipher block or IV with the
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* current clear block.
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*/
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xor_block(blockp, lastp);
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encrypt(ctx->cbc_keysched, lastp, lastp);
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crypto_get_ptrs(out, &iov_or_mp, &offset, &out_data_1,
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&out_data_1_len, &out_data_2, block_size);
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/* copy block to where it belongs */
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if (out_data_1_len == block_size) {
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copy_block(lastp, out_data_1);
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} else {
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bcopy(lastp, out_data_1, out_data_1_len);
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if (out_data_2 != NULL) {
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bcopy(lastp + out_data_1_len,
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out_data_2,
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block_size - out_data_1_len);
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}
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}
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/* update offset */
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out->cd_offset += block_size;
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/* Update pointer to next block of data to be processed. */
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if (ctx->cbc_remainder_len != 0) {
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datap += need;
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ctx->cbc_remainder_len = 0;
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} else {
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datap += block_size;
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}
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remainder = (size_t)&data[length] - (size_t)datap;
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/* Incomplete last block. */
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if (remainder > 0 && remainder < block_size) {
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bcopy(datap, ctx->cbc_remainder, remainder);
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ctx->cbc_remainder_len = remainder;
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ctx->cbc_copy_to = datap;
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goto out;
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}
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ctx->cbc_copy_to = NULL;
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} while (remainder > 0);
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out:
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/*
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* Save the last encrypted block in the context.
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*/
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if (ctx->cbc_lastp != NULL) {
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copy_block((uint8_t *)ctx->cbc_lastp, (uint8_t *)ctx->cbc_iv);
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ctx->cbc_lastp = (uint8_t *)ctx->cbc_iv;
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}
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return (CRYPTO_SUCCESS);
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}
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#define OTHER(a, ctx) \
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(((a) == (ctx)->cbc_lastblock) ? (ctx)->cbc_iv : (ctx)->cbc_lastblock)
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/* ARGSUSED */
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int
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cbc_decrypt_contiguous_blocks(cbc_ctx_t *ctx, char *data, size_t length,
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crypto_data_t *out, size_t block_size,
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int (*decrypt)(const void *, const uint8_t *, uint8_t *),
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void (*copy_block)(uint8_t *, uint8_t *),
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void (*xor_block)(uint8_t *, uint8_t *))
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{
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size_t remainder = length;
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size_t need = 0;
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uint8_t *datap = (uint8_t *)data;
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uint8_t *blockp;
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uint8_t *lastp;
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void *iov_or_mp;
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offset_t offset;
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uint8_t *out_data_1;
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uint8_t *out_data_2;
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size_t out_data_1_len;
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if (length + ctx->cbc_remainder_len < block_size) {
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/* accumulate bytes here and return */
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bcopy(datap,
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(uint8_t *)ctx->cbc_remainder + ctx->cbc_remainder_len,
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length);
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ctx->cbc_remainder_len += length;
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ctx->cbc_copy_to = datap;
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return (CRYPTO_SUCCESS);
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}
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lastp = ctx->cbc_lastp;
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crypto_init_ptrs(out, &iov_or_mp, &offset);
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do {
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/* Unprocessed data from last call. */
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if (ctx->cbc_remainder_len > 0) {
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need = block_size - ctx->cbc_remainder_len;
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if (need > remainder)
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return (CRYPTO_ENCRYPTED_DATA_LEN_RANGE);
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bcopy(datap, &((uint8_t *)ctx->cbc_remainder)
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[ctx->cbc_remainder_len], need);
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blockp = (uint8_t *)ctx->cbc_remainder;
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} else {
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blockp = datap;
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}
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/* LINTED: pointer alignment */
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copy_block(blockp, (uint8_t *)OTHER((uint64_t *)lastp, ctx));
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decrypt(ctx->cbc_keysched, blockp,
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(uint8_t *)ctx->cbc_remainder);
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blockp = (uint8_t *)ctx->cbc_remainder;
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/*
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* XOR the previous cipher block or IV with the
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* currently decrypted block.
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*/
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xor_block(lastp, blockp);
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/* LINTED: pointer alignment */
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lastp = (uint8_t *)OTHER((uint64_t *)lastp, ctx);
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crypto_get_ptrs(out, &iov_or_mp, &offset, &out_data_1,
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&out_data_1_len, &out_data_2, block_size);
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bcopy(blockp, out_data_1, out_data_1_len);
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if (out_data_2 != NULL) {
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bcopy(blockp + out_data_1_len, out_data_2,
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block_size - out_data_1_len);
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}
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/* update offset */
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out->cd_offset += block_size;
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/* Update pointer to next block of data to be processed. */
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if (ctx->cbc_remainder_len != 0) {
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datap += need;
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ctx->cbc_remainder_len = 0;
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} else {
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datap += block_size;
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}
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remainder = (size_t)&data[length] - (size_t)datap;
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/* Incomplete last block. */
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if (remainder > 0 && remainder < block_size) {
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bcopy(datap, ctx->cbc_remainder, remainder);
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ctx->cbc_remainder_len = remainder;
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ctx->cbc_lastp = lastp;
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ctx->cbc_copy_to = datap;
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return (CRYPTO_SUCCESS);
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}
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ctx->cbc_copy_to = NULL;
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} while (remainder > 0);
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ctx->cbc_lastp = lastp;
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return (CRYPTO_SUCCESS);
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}
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int
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cbc_init_ctx(cbc_ctx_t *cbc_ctx, char *param, size_t param_len,
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size_t block_size, void (*copy_block)(uint8_t *, uint64_t *))
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{
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/*
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* Copy IV into context.
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*
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* If cm_param == NULL then the IV comes from the
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* cd_miscdata field in the crypto_data structure.
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*/
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if (param != NULL) {
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ASSERT(param_len == block_size);
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copy_block((uchar_t *)param, cbc_ctx->cbc_iv);
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}
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cbc_ctx->cbc_lastp = (uint8_t *)&cbc_ctx->cbc_iv[0];
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cbc_ctx->cbc_flags |= CBC_MODE;
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return (CRYPTO_SUCCESS);
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}
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/* ARGSUSED */
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void *
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cbc_alloc_ctx(int kmflag)
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{
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cbc_ctx_t *cbc_ctx;
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if ((cbc_ctx = kmem_zalloc(sizeof (cbc_ctx_t), kmflag)) == NULL)
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return (NULL);
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cbc_ctx->cbc_flags = CBC_MODE;
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return (cbc_ctx);
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}
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