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