aes_modes.c

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    1 /*
    2  * CDDL HEADER START
    3  *
    4  * The contents of this file are subject to the terms of the
    5  * Common Development and Distribution License (the "License").
    6  * You may not use this file except in compliance with the License.
    7  *
    8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
    9  * or https://opensource.org/licenses/CDDL-1.0.
   10  * See the License for the specific language governing permissions
   11  * and limitations under the License.
   12  *
   13  * When distributing Covered Code, include this CDDL HEADER in each
   14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   15  * If applicable, add the following below this CDDL HEADER, with the
   16  * fields enclosed by brackets "[]" replaced with your own identifying
   17  * information: Portions Copyright [yyyy] [name of copyright owner]
   18  *
   19  * CDDL HEADER END
   20  */
   21 /*
   22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   23  * Use is subject to license terms.
   24  */
   25 
   26 #include <sys/zfs_context.h>
   27 #include <modes/modes.h>
   28 #include <aes/aes_impl.h>
   29 
   30 /* Copy a 16-byte AES block from "in" to "out" */
   31 void
   32 aes_copy_block(uint8_t *in, uint8_t *out)
   33 {
   34         if (IS_P2ALIGNED2(in, out, sizeof (uint32_t))) {
   35                 /* LINTED: pointer alignment */
   36                 *(uint32_t *)&out[0] = *(uint32_t *)&in[0];
   37                 /* LINTED: pointer alignment */
   38                 *(uint32_t *)&out[4] = *(uint32_t *)&in[4];
   39                 /* LINTED: pointer alignment */
   40                 *(uint32_t *)&out[8] = *(uint32_t *)&in[8];
   41                 /* LINTED: pointer alignment */
   42                 *(uint32_t *)&out[12] = *(uint32_t *)&in[12];
   43         } else {
   44                 AES_COPY_BLOCK(in, out);
   45         }
   46 }
   47 
   48 
   49 /* XOR a 16-byte AES block of data into dst */
   50 void
   51 aes_xor_block(uint8_t *data, uint8_t *dst)
   52 {
   53         if (IS_P2ALIGNED2(dst, data, sizeof (uint32_t))) {
   54                 /* LINTED: pointer alignment */
   55                 *(uint32_t *)&dst[0] ^= *(uint32_t *)&data[0];
   56                 /* LINTED: pointer alignment */
   57                 *(uint32_t *)&dst[4] ^= *(uint32_t *)&data[4];
   58                 /* LINTED: pointer alignment */
   59                 *(uint32_t *)&dst[8] ^= *(uint32_t *)&data[8];
   60                 /* LINTED: pointer alignment */
   61                 *(uint32_t *)&dst[12] ^= *(uint32_t *)&data[12];
   62         } else {
   63                 AES_XOR_BLOCK(data, dst);
   64         }
   65 }
   66 
   67 
   68 /*
   69  * Encrypt multiple blocks of data according to mode.
   70  */
   71 int
   72 aes_encrypt_contiguous_blocks(void *ctx, char *data, size_t length,
   73     crypto_data_t *out)
   74 {
   75         aes_ctx_t *aes_ctx = ctx;
   76         int rv;
   77 
   78         if (aes_ctx->ac_flags & CTR_MODE) {
   79                 rv = ctr_mode_contiguous_blocks(ctx, data, length, out,
   80                     AES_BLOCK_LEN, aes_encrypt_block, aes_xor_block);
   81         } else if (aes_ctx->ac_flags & CCM_MODE) {
   82                 rv = ccm_mode_encrypt_contiguous_blocks(ctx, data, length,
   83                     out, AES_BLOCK_LEN, aes_encrypt_block, aes_copy_block,
   84                     aes_xor_block);
   85         } else if (aes_ctx->ac_flags & (GCM_MODE|GMAC_MODE)) {
   86                 rv = gcm_mode_encrypt_contiguous_blocks(ctx, data, length,
   87                     out, AES_BLOCK_LEN, aes_encrypt_block, aes_copy_block,
   88                     aes_xor_block);
   89         } else if (aes_ctx->ac_flags & CBC_MODE) {
   90                 rv = cbc_encrypt_contiguous_blocks(ctx,
   91                     data, length, out, AES_BLOCK_LEN, aes_encrypt_block,
   92                     aes_copy_block, aes_xor_block);
   93         } else {
   94                 rv = ecb_cipher_contiguous_blocks(ctx, data, length, out,
   95                     AES_BLOCK_LEN, aes_encrypt_block);
   96         }
   97         return (rv);
   98 }
   99 
  100 
  101 /*
  102  * Decrypt multiple blocks of data according to mode.
  103  */
  104 int
  105 aes_decrypt_contiguous_blocks(void *ctx, char *data, size_t length,
  106     crypto_data_t *out)
  107 {
  108         aes_ctx_t *aes_ctx = ctx;
  109         int rv;
  110 
  111         if (aes_ctx->ac_flags & CTR_MODE) {
  112                 rv = ctr_mode_contiguous_blocks(ctx, data, length, out,
  113                     AES_BLOCK_LEN, aes_encrypt_block, aes_xor_block);
  114                 if (rv == CRYPTO_DATA_LEN_RANGE)
  115                         rv = CRYPTO_ENCRYPTED_DATA_LEN_RANGE;
  116         } else if (aes_ctx->ac_flags & CCM_MODE) {
  117                 rv = ccm_mode_decrypt_contiguous_blocks(ctx, data, length,
  118                     out, AES_BLOCK_LEN, aes_encrypt_block, aes_copy_block,
  119                     aes_xor_block);
  120         } else if (aes_ctx->ac_flags & (GCM_MODE|GMAC_MODE)) {
  121                 rv = gcm_mode_decrypt_contiguous_blocks(ctx, data, length,
  122                     out, AES_BLOCK_LEN, aes_encrypt_block, aes_copy_block,
  123                     aes_xor_block);
  124         } else if (aes_ctx->ac_flags & CBC_MODE) {
  125                 rv = cbc_decrypt_contiguous_blocks(ctx, data, length, out,
  126                     AES_BLOCK_LEN, aes_decrypt_block, aes_copy_block,
  127                     aes_xor_block);
  128         } else {
  129                 rv = ecb_cipher_contiguous_blocks(ctx, data, length, out,
  130                     AES_BLOCK_LEN, aes_decrypt_block);
  131                 if (rv == CRYPTO_DATA_LEN_RANGE)
  132                         rv = CRYPTO_ENCRYPTED_DATA_LEN_RANGE;
  133         }
  134         return (rv);
  135 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/module/icp/algs/aes/aes_modes.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/icp/algs/aes/aes_modes.c