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66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
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/* getentropy_win.c - get entropy on Windows.
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*
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* Copyright (c) 2014, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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int
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getentropy(void *buf, size_t len)
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{
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HMODULE lib;
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if(len > 256) {
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errno = EIO;
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return -1;
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}
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/* Get entropy with windows secure random number generator,
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* for windows XP and later, it is in the ADVAPI32 dll */
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lib = LoadLibrary("ADVAPI32.DLL");
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if(lib) {
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/* Load the RtlGenRandom function */
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BOOLEAN (APIENTRY* genrandom)(void*,ULONG) =
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(BOOLEAN (APIENTRY*)(void*,ULONG))
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GetProcAddress(lib, "SystemFunction036");
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if(genrandom) {
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if(genrandom(buf, len)) {
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FreeLibrary(lib);
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return 0; /* success */
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}
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}
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FreeLibrary(lib);
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}
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errno = EIO;
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return -1;
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}
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