module/icp/core/kcf_prov_lib.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 <sys/crypto/common.h>
  29 #include <sys/crypto/impl.h>
  30
  31 /*
  32  * Utility routine to copy a buffer to a crypto_data structure.
  33  */
  34
  35 /*
  36  * Utility routine to apply the command COPY_TO_DATA to the
  37  * data in the uio structure.
  38  */
  39 static int
  40 crypto_uio_copy_to_data(crypto_data_t *data, uchar_t *buf, int len)
  41 {
  42         zfs_uio_t *uiop = data->cd_uio;
  43         off_t offset = data->cd_offset;
  44         size_t length = len;
  45         uint_t vec_idx;
  46         size_t cur_len;
  47         uchar_t *datap;
  48
  49         ASSERT(data->cd_format == CRYPTO_DATA_UIO);
  50         if (zfs_uio_segflg(uiop) != UIO_SYSSPACE) {
  51                 return (CRYPTO_ARGUMENTS_BAD);
  52         }
  53
  54         /*
  55          * Jump to the first iovec containing data to be
  56          * processed.
  57          */
  58         offset = zfs_uio_index_at_offset(uiop, offset, &vec_idx);
  59
  60         if (vec_idx == zfs_uio_iovcnt(uiop) && length > 0) {
  61                 /*
  62                  * The caller specified an offset that is larger than
  63                  * the total size of the buffers it provided.
  64                  */
  65                 return (CRYPTO_DATA_LEN_RANGE);
  66         }
  67
  68         while (vec_idx < zfs_uio_iovcnt(uiop) && length > 0) {
  69                 cur_len = MIN(zfs_uio_iovlen(uiop, vec_idx) -
  70                     offset, length);
  71
  72                 datap = (uchar_t *)(zfs_uio_iovbase(uiop, vec_idx) + offset);
  73                 memcpy(datap, buf, cur_len);
  74                 buf += cur_len;
  75
  76                 length -= cur_len;
  77                 vec_idx++;
  78                 offset = 0;
  79         }
  80
  81         if (vec_idx == zfs_uio_iovcnt(uiop) && length > 0) {
  82                 /*
  83                  * The end of the specified iovecs was reached but
  84                  * the length requested could not be processed.
  85                  */
  86                 data->cd_length = len;
  87                 return (CRYPTO_BUFFER_TOO_SMALL);
  88         }
  89
  90         return (CRYPTO_SUCCESS);
  91 }
  92
  93 int
  94 crypto_put_output_data(uchar_t *buf, crypto_data_t *output, int len)
  95 {
  96         switch (output->cd_format) {
  97         case CRYPTO_DATA_RAW:
  98                 if (output->cd_raw.iov_len < len) {
  99                         output->cd_length = len;
 100                         return (CRYPTO_BUFFER_TOO_SMALL);
 101                 }
 102                 memcpy((uchar_t *)(output->cd_raw.iov_base +
 103                     output->cd_offset), buf, len);
 104                 break;
 105
 106         case CRYPTO_DATA_UIO:
 107                 return (crypto_uio_copy_to_data(output, buf, len));
 108         default:
 109                 return (CRYPTO_ARGUMENTS_BAD);
 110         }
 111
 112         return (CRYPTO_SUCCESS);
 113 }
 114
 115 int
 116 crypto_update_iov(void *ctx, crypto_data_t *input, crypto_data_t *output,
 117     int (*cipher)(void *, caddr_t, size_t, crypto_data_t *))
 118 {
 119         ASSERT(input != output);
 120
 121         if (input->cd_raw.iov_len < input->cd_length)
 122                 return (CRYPTO_ARGUMENTS_BAD);
 123
 124         return ((cipher)(ctx, input->cd_raw.iov_base + input->cd_offset,
 125             input->cd_length, output));
 126 }
 127
 128 int
 129 crypto_update_uio(void *ctx, crypto_data_t *input, crypto_data_t *output,
 130     int (*cipher)(void *, caddr_t, size_t, crypto_data_t *))
 131 {
 132         zfs_uio_t *uiop = input->cd_uio;
 133         off_t offset = input->cd_offset;
 134         size_t length = input->cd_length;
 135         uint_t vec_idx;
 136         size_t cur_len;
 137
 138         ASSERT(input != output);
 139
 140         if (zfs_uio_segflg(input->cd_uio) != UIO_SYSSPACE) {
 141                 return (CRYPTO_ARGUMENTS_BAD);
 142         }
 143
 144         /*
 145          * Jump to the first iovec containing data to be
 146          * processed.
 147          */
 148         offset = zfs_uio_index_at_offset(uiop, offset, &vec_idx);
 149         if (vec_idx == zfs_uio_iovcnt(uiop) && length > 0) {
 150                 /*
 151                  * The caller specified an offset that is larger than the
 152                  * total size of the buffers it provided.
 153                  */
 154                 return (CRYPTO_DATA_LEN_RANGE);
 155         }
 156
 157         /*
 158          * Now process the iovecs.
 159          */
 160         while (vec_idx < zfs_uio_iovcnt(uiop) && length > 0) {
 161                 cur_len = MIN(zfs_uio_iovlen(uiop, vec_idx) -
 162                     offset, length);
 163
 164                 int rv = (cipher)(ctx, zfs_uio_iovbase(uiop, vec_idx) + offset,
 165                     cur_len, output);
 166
 167                 if (rv != CRYPTO_SUCCESS) {
 168                         return (rv);
 169                 }
 170                 length -= cur_len;
 171                 vec_idx++;
 172                 offset = 0;
 173         }
 174
 175         if (vec_idx == zfs_uio_iovcnt(uiop) && length > 0) {
 176                 /*
 177                  * The end of the specified iovec's was reached but
 178                  * the length requested could not be processed, i.e.
 179                  * The caller requested to digest more data than it provided.
 180                  */
 181
 182                 return (CRYPTO_DATA_LEN_RANGE);
 183         }
 184
 185         return (CRYPTO_SUCCESS);
 186 }