usr/src/common/crypto/modes/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 #ifndef _KERNEL
  27 #include <stdlib.h>
  28 #endif
  29
  30 #include <sys/strsun.h>
  31 #include <sys/types.h>
  32 #include <modes/modes.h>
  33 #include <sys/crypto/common.h>
  34 #include <sys/crypto/impl.h>
  35
  36 /*
  37  * Initialize by setting iov_or_mp to point to the current iovec or mp,
  38  * and by setting current_offset to an offset within the current iovec or mp.
  39  */
  40 void
  41 crypto_init_ptrs(crypto_data_t *out, void **iov_or_mp, offset_t *current_offset)
  42 {
  43         offset_t offset;
  44
  45         switch (out->cd_format) {
  46         case CRYPTO_DATA_RAW:
  47                 *current_offset = out->cd_offset;
  48                 break;
  49
  50         case CRYPTO_DATA_UIO: {
  51                 uio_t *uiop = out->cd_uio;
  52                 uintptr_t vec_idx;
  53
  54                 offset = out->cd_offset;
  55                 for (vec_idx = 0; vec_idx < uiop->uio_iovcnt &&
  56                     offset >= uiop->uio_iov[vec_idx].iov_len;
  57                     offset -= uiop->uio_iov[vec_idx++].iov_len)
  58                         ;
  59
  60                 *current_offset = offset;
  61                 *iov_or_mp = (void *)vec_idx;
  62                 break;
  63         }
  64
  65         case CRYPTO_DATA_MBLK: {
  66                 mblk_t *mp;
  67
  68                 offset = out->cd_offset;
  69                 for (mp = out->cd_mp; mp != NULL && offset >= MBLKL(mp);
  70                     offset -= MBLKL(mp), mp = mp->b_cont)
  71                         ;
  72
  73                 *current_offset = offset;
  74                 *iov_or_mp = mp;
  75                 break;
  76
  77         }
  78         } /* end switch */
  79 }
  80
  81 /*
  82  * Get pointers for where in the output to copy a block of encrypted or
  83  * decrypted data.  The iov_or_mp argument stores a pointer to the current
  84  * iovec or mp, and offset stores an offset into the current iovec or mp.
  85  */
  86 void
  87 crypto_get_ptrs(crypto_data_t *out, void **iov_or_mp, offset_t *current_offset,
  88     uint8_t **out_data_1, size_t *out_data_1_len, uint8_t **out_data_2,
  89     size_t amt)
  90 {
  91         offset_t offset;
  92
  93         switch (out->cd_format) {
  94         case CRYPTO_DATA_RAW: {
  95                 iovec_t *iov;
  96
  97                 offset = *current_offset;
  98                 iov = &out->cd_raw;
  99                 if ((offset + amt) <= iov->iov_len) {
 100                         /* one block fits */
 101                         *out_data_1 = (uint8_t *)iov->iov_base + offset;
 102                         *out_data_1_len = amt;
 103                         *out_data_2 = NULL;
 104                         *current_offset = offset + amt;
 105                 }
 106                 break;
 107         }
 108
 109         case CRYPTO_DATA_UIO: {
 110                 uio_t *uio = out->cd_uio;
 111                 iovec_t *iov;
 112                 offset_t offset;
 113                 uintptr_t vec_idx;
 114                 uint8_t *p;
 115
 116                 offset = *current_offset;
 117                 vec_idx = (uintptr_t)(*iov_or_mp);
 118                 iov = &uio->uio_iov[vec_idx];
 119                 p = (uint8_t *)iov->iov_base + offset;
 120                 *out_data_1 = p;
 121
 122                 if (offset + amt <= iov->iov_len) {
 123                         /* can fit one block into this iov */
 124                         *out_data_1_len = amt;
 125                         *out_data_2 = NULL;
 126                         *current_offset = offset + amt;
 127                 } else {
 128                         /* one block spans two iovecs */
 129                         *out_data_1_len = iov->iov_len - offset;
 130                         if (vec_idx == uio->uio_iovcnt)
 131                                 return;
 132                         vec_idx++;
 133                         iov = &uio->uio_iov[vec_idx];
 134                         *out_data_2 = (uint8_t *)iov->iov_base;
 135                         *current_offset = amt - *out_data_1_len;
 136                 }
 137                 *iov_or_mp = (void *)vec_idx;
 138                 break;
 139         }
 140
 141         case CRYPTO_DATA_MBLK: {
 142                 mblk_t *mp;
 143                 uint8_t *p;
 144
 145                 offset = *current_offset;
 146                 mp = (mblk_t *)*iov_or_mp;
 147                 p = mp->b_rptr + offset;
 148                 *out_data_1 = p;
 149                 if ((p + amt) <= mp->b_wptr) {
 150                         /* can fit one block into this mblk */
 151                         *out_data_1_len = amt;
 152                         *out_data_2 = NULL;
 153                         *current_offset = offset + amt;
 154                 } else {
 155                         /* one block spans two mblks */
 156                         *out_data_1_len = _PTRDIFF(mp->b_wptr, p);
 157                         if ((mp = mp->b_cont) == NULL)
 158                                 return;
 159                         *out_data_2 = mp->b_rptr;
 160                         *current_offset = (amt - *out_data_1_len);
 161                 }
 162                 *iov_or_mp = mp;
 163                 break;
 164         }
 165         } /* end switch */
 166 }
 167
 168 void
 169 crypto_free_mode_ctx(void *ctx)
 170 {
 171         common_ctx_t *common_ctx = (common_ctx_t *)ctx;
 172
 173         switch (common_ctx->cc_flags &
 174             (ECB_MODE|CBC_MODE|CTR_MODE|CCM_MODE|GCM_MODE|GMAC_MODE)) {
 175         case ECB_MODE:
 176 #ifdef _KERNEL
 177                 kmem_free(common_ctx, sizeof (ecb_ctx_t));
 178 #else
 179                 free(common_ctx);
 180 #endif
 181                 break;
 182
 183         case CBC_MODE:
 184 #ifdef _KERNEL
 185                 kmem_free(common_ctx, sizeof (cbc_ctx_t));
 186 #else
 187                 free(common_ctx);
 188 #endif
 189                 break;
 190
 191         case CTR_MODE:
 192 #ifdef _KERNEL
 193                 kmem_free(common_ctx, sizeof (ctr_ctx_t));
 194 #else
 195                 free(common_ctx);
 196 #endif
 197                 break;
 198
 199         case CCM_MODE:
 200 #ifdef _KERNEL
 201                 if (((ccm_ctx_t *)ctx)->ccm_pt_buf != NULL)
 202                         kmem_free(((ccm_ctx_t *)ctx)->ccm_pt_buf,
 203                             ((ccm_ctx_t *)ctx)->ccm_data_len);
 204
 205                 kmem_free(ctx, sizeof (ccm_ctx_t));
 206 #else
 207                 if (((ccm_ctx_t *)ctx)->ccm_pt_buf != NULL)
 208                         free(((ccm_ctx_t *)ctx)->ccm_pt_buf);
 209                 free(ctx);
 210 #endif
 211                 break;
 212
 213         case GCM_MODE:
 214         case GMAC_MODE:
 215 #ifdef _KERNEL
 216                 if (((gcm_ctx_t *)ctx)->gcm_pt_buf != NULL)
 217                         kmem_free(((gcm_ctx_t *)ctx)->gcm_pt_buf,
 218                             ((gcm_ctx_t *)ctx)->gcm_pt_buf_len);
 219
 220                 kmem_free(ctx, sizeof (gcm_ctx_t));
 221 #else
 222                 if (((gcm_ctx_t *)ctx)->gcm_pt_buf != NULL)
 223                         free(((gcm_ctx_t *)ctx)->gcm_pt_buf);
 224                 free(ctx);
 225 #endif
 226         }
 227 }