137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
/*
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* Platform-specific and custom entropy polling functions
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*
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* Copyright (C) 2006-2011, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_ENTROPY_C)
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#include "polarssl/entropy.h"
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#include "polarssl/entropy_poll.h"
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#if defined(POLARSSL_TIMING_C)
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#include "polarssl/timing.h"
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#endif
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#if defined(POLARSSL_HAVEGE_C)
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#include "polarssl/havege.h"
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#endif
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#if !defined(POLARSSL_NO_PLATFORM_ENTROPY)
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#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
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#if !defined(_WIN32_WINNT)
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#define _WIN32_WINNT 0x0400
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#endif
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#include <windows.h>
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#include <wincrypt.h>
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int platform_entropy_poll( void *data, unsigned char *output, size_t len,
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size_t *olen )
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{
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HCRYPTPROV provider;
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((void) data);
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*olen = 0;
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if( CryptAcquireContext( &provider, NULL, NULL,
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PROV_RSA_FULL, CRYPT_VERIFYCONTEXT ) == FALSE )
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{
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return POLARSSL_ERR_ENTROPY_SOURCE_FAILED;
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}
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if( CryptGenRandom( provider, (DWORD) len, output ) == FALSE )
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return POLARSSL_ERR_ENTROPY_SOURCE_FAILED;
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CryptReleaseContext( provider, 0 );
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*olen = len;
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return( 0 );
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}
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#else
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#include <stdio.h>
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int platform_entropy_poll( void *data,
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unsigned char *output, size_t len, size_t *olen )
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{
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FILE *file;
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size_t ret;
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((void) data);
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*olen = 0;
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file = fopen( "/dev/urandom", "rb" );
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if( file == NULL )
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return POLARSSL_ERR_ENTROPY_SOURCE_FAILED;
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ret = fread( output, 1, len, file );
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if( ret != len )
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{
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fclose( file );
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return POLARSSL_ERR_ENTROPY_SOURCE_FAILED;
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}
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fclose( file );
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*olen = len;
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return( 0 );
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}
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#endif
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#endif
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#if defined(POLARSSL_TIMING_C)
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int hardclock_poll( void *data,
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unsigned char *output, size_t len, size_t *olen )
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{
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unsigned long timer = hardclock();
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((void) data);
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*olen = 0;
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if( len < sizeof(unsigned long) )
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return( 0 );
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memcpy( output, &timer, sizeof(unsigned long) );
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*olen = sizeof(unsigned long);
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return( 0 );
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}
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#endif
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#if defined(POLARSSL_HAVEGE_C)
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int havege_poll( void *data,
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unsigned char *output, size_t len, size_t *olen )
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{
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havege_state *hs = (havege_state *) data;
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*olen = 0;
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if( havege_random( hs, output, len ) != 0 )
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return POLARSSL_ERR_ENTROPY_SOURCE_FAILED;
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*olen = len;
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return( 0 );
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}
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#endif
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#endif /* POLARSSL_ENTROPY_C */
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