module/icp/algs/aes/aes_modes.c

   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 http://www.opensolaris.org/os/licensing.
  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 }