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 "crypto/ivgenpriv.h"
  23 #include "crypto/ivgen-plain.h"
  24 #include "crypto/ivgen-plain64.h"
  25 #include "crypto/ivgen-essiv.h"
  26
  27
  28 QCryptoIVGen *qcrypto_ivgen_new(QCryptoIVGenAlgorithm alg,
  29                                 QCryptoCipherAlgorithm cipheralg,
  30                                 QCryptoHashAlgorithm hash,
  31                                 const uint8_t *key, size_t nkey,
  32                                 Error **errp)
  33 {
  34     QCryptoIVGen *ivgen = g_new0(QCryptoIVGen, 1);
  35
  36     ivgen->algorithm = alg;
  37     ivgen->cipher = cipheralg;
  38     ivgen->hash = hash;
  39
  40     switch (alg) {
  41     case QCRYPTO_IVGEN_ALG_PLAIN:
  42         ivgen->driver = &qcrypto_ivgen_plain;
  43         break;
  44     case QCRYPTO_IVGEN_ALG_PLAIN64:
  45         ivgen->driver = &qcrypto_ivgen_plain64;
  46         break;
  47     case QCRYPTO_IVGEN_ALG_ESSIV:
  48         ivgen->driver = &qcrypto_ivgen_essiv;
  49         break;
  50     default:
  51         error_setg(errp, "Unknown block IV generator algorithm %d", alg);
  52         g_free(ivgen);
  53         return NULL;
  54     }
  55
  56     if (ivgen->driver->init(ivgen, key, nkey, errp) < 0) {
  57         g_free(ivgen);
  58         return NULL;
  59     }
  60
  61     return ivgen;
  62 }
  63
  64
  65 int qcrypto_ivgen_calculate(QCryptoIVGen *ivgen,
  66                             uint64_t sector,
  67                             uint8_t *iv, size_t niv,
  68                             Error **errp)
  69 {
  70     return ivgen->driver->calculate(ivgen, sector, iv, niv, errp);
  71 }
  72
  73
  74 QCryptoIVGenAlgorithm qcrypto_ivgen_get_algorithm(QCryptoIVGen *ivgen)
  75 {
  76     return ivgen->algorithm;
  77 }
  78
  79
  80 QCryptoCipherAlgorithm qcrypto_ivgen_get_cipher(QCryptoIVGen *ivgen)
  81 {
  82     return ivgen->cipher;
  83 }
  84
  85
  86 QCryptoHashAlgorithm qcrypto_ivgen_get_hash(QCryptoIVGen *ivgen)
  87 {
  88     return ivgen->hash;
  89 }
  90
  91
  92 void qcrypto_ivgen_free(QCryptoIVGen *ivgen)
  93 {
  94     if (!ivgen) {
  95         return;
  96     }
  97     ivgen->driver->cleanup(ivgen);
  98     g_free(ivgen);
  99 }