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a37278169d
If no crypto library is included in the build, QEMU uses qcrypto_random_bytes() to generate random data. That function tried to open /dev/urandom or /dev/random and if opening both files failed it errored out. Those files obviously do not exist on windows, so there the code uses CryptGenRandom(). Furthermore there was some refactoring and a new function qcrypto_random_init() was introduced. If a proper crypto library (gnutls or libgcrypt) is included in the build, this function does nothing. If neither is included it initializes the (platform specific) handles that are used by qcrypto_random_bytes(). Either: * a handle to /dev/urandom | /dev/random on unix like systems * a handle to a cryptographic service provider on windows Signed-off-by: Geert Martin Ijewski <gm.ijewski@web.de> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
36 lines
1.1 KiB
C
36 lines
1.1 KiB
C
/*
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* QEMU Crypto random number provider
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*
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* Copyright (c) 2015-2016 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "qemu/osdep.h"
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#include "crypto/random.h"
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#include <gcrypt.h>
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int qcrypto_random_bytes(uint8_t *buf,
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size_t buflen,
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Error **errp G_GNUC_UNUSED)
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{
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gcry_randomize(buf, buflen, GCRY_STRONG_RANDOM);
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return 0;
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}
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int qcrypto_random_init(Error **errp G_GNUC_UNUSED) { return 0; }
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