crypto/ivgen.c

   1 /*
   2  * QEMU Crypto block IV generator
   3  *
   4  * Copyright (c) 2015-2016 Red Hat, Inc.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "qapi/error.h"
  23
  24 #include "crypto/ivgenpriv.h"
  25 #include "crypto/ivgen-plain.h"
  26 #include "crypto/ivgen-plain64.h"
  27 #include "crypto/ivgen-essiv.h"
  28
  29
  30 QCryptoIVGen *qcrypto_ivgen_new(QCryptoIVGenAlgorithm alg,
  31                                 QCryptoCipherAlgorithm cipheralg,
  32                                 QCryptoHashAlgorithm hash,
  33                                 const uint8_t *key, size_t nkey,
  34                                 Error **errp)
  35 {
  36     QCryptoIVGen *ivgen = g_new0(QCryptoIVGen, 1);
  37
  38     ivgen->algorithm = alg;
  39     ivgen->cipher = cipheralg;
  40     ivgen->hash = hash;
  41
  42     switch (alg) {
  43     case QCRYPTO_IVGEN_ALG_PLAIN:
  44         ivgen->driver = &qcrypto_ivgen_plain;
  45         break;
  46     case QCRYPTO_IVGEN_ALG_PLAIN64:
  47         ivgen->driver = &qcrypto_ivgen_plain64;
  48         break;
  49     case QCRYPTO_IVGEN_ALG_ESSIV:
  50         ivgen->driver = &qcrypto_ivgen_essiv;
  51         break;
  52     default:
  53         error_setg(errp, "Unknown block IV generator algorithm %d", alg);
  54         g_free(ivgen);
  55         return NULL;
  56     }
  57
  58     if (ivgen->driver->init(ivgen, key, nkey, errp) < 0) {
  59         g_free(ivgen);
  60         return NULL;
  61     }
  62
  63     return ivgen;
  64 }
  65
  66
  67 int qcrypto_ivgen_calculate(QCryptoIVGen *ivgen,
  68                             uint64_t sector,
  69                             uint8_t *iv, size_t niv,
  70                             Error **errp)
  71 {
  72     return ivgen->driver->calculate(ivgen, sector, iv, niv, errp);
  73 }
  74
  75
  76 QCryptoIVGenAlgorithm qcrypto_ivgen_get_algorithm(QCryptoIVGen *ivgen)
  77 {
  78     return ivgen->algorithm;
  79 }
  80
  81
  82 QCryptoCipherAlgorithm qcrypto_ivgen_get_cipher(QCryptoIVGen *ivgen)
  83 {
  84     return ivgen->cipher;
  85 }
  86
  87
  88 QCryptoHashAlgorithm qcrypto_ivgen_get_hash(QCryptoIVGen *ivgen)
  89 {
  90     return ivgen->hash;
  91 }
  92
  93
  94 void qcrypto_ivgen_free(QCryptoIVGen *ivgen)
  95 {
  96     if (!ivgen) {
  97         return;
  98     }
  99     ivgen->driver->cleanup(ivgen);
 100     g_free(ivgen);
 101 }