mirror of
https://github.com/token2/fido2-manage.git
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84 lines
1.4 KiB
C
84 lines
1.4 KiB
C
/*
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* Copyright (c) 2018 Yubico AB. All rights reserved.
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* Use of this source code is governed by a BSD-style
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* license that can be found in the LICENSE file.
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef HAVE_SYS_RANDOM_H
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#include <sys/random.h>
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#endif
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#include <fcntl.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "fido.h"
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#if defined(_WIN32)
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#include <windows.h>
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#include <winternl.h>
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#include <winerror.h>
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#include <stdio.h>
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#include <bcrypt.h>
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#include <sal.h>
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int
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fido_get_random(void *buf, size_t len)
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{
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NTSTATUS status;
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status = BCryptGenRandom(NULL, buf, (ULONG)len,
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BCRYPT_USE_SYSTEM_PREFERRED_RNG);
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if (!NT_SUCCESS(status))
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return (-1);
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return (0);
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}
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#elif defined(HAVE_ARC4RANDOM_BUF)
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int
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fido_get_random(void *buf, size_t len)
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{
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arc4random_buf(buf, len);
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return (0);
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}
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#elif defined(HAVE_GETRANDOM)
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int
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fido_get_random(void *buf, size_t len)
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{
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ssize_t r;
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if ((r = getrandom(buf, len, 0)) < 0 || (size_t)r != len)
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return (-1);
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return (0);
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}
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#elif defined(HAVE_DEV_URANDOM)
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int
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fido_get_random(void *buf, size_t len)
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{
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int fd = -1;
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int ok = -1;
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ssize_t r;
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if ((fd = open(FIDO_RANDOM_DEV, O_RDONLY)) < 0)
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goto fail;
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if ((r = read(fd, buf, len)) < 0 || (size_t)r != len)
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goto fail;
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ok = 0;
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fail:
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if (fd != -1)
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close(fd);
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return (ok);
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}
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#else
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#error "please provide an implementation of fido_get_random() for your platform"
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#endif /* _WIN32 */
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