mirror of
https://github.com/reactos/reactos.git
synced 2024-08-29 14:48:37 +00:00
271 lines
6.7 KiB
C
271 lines
6.7 KiB
C
/*
|
|
* Platform-specific and custom entropy polling functions
|
|
*
|
|
* Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
|
|
* SPDX-License-Identifier: GPL-2.0
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* This file is part of mbed TLS (https://tls.mbed.org)
|
|
*/
|
|
|
|
#if !defined(MBEDTLS_CONFIG_FILE)
|
|
#include "mbedtls/config.h"
|
|
#else
|
|
#include MBEDTLS_CONFIG_FILE
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_ENTROPY_C)
|
|
|
|
#include "mbedtls/entropy.h"
|
|
#include "mbedtls/entropy_poll.h"
|
|
|
|
#if defined(MBEDTLS_TIMING_C)
|
|
#include <string.h>
|
|
#include "mbedtls/timing.h"
|
|
#endif
|
|
#if defined(MBEDTLS_HAVEGE_C)
|
|
#include "mbedtls/havege.h"
|
|
#endif
|
|
#if defined(MBEDTLS_ENTROPY_NV_SEED)
|
|
#include "mbedtls/platform.h"
|
|
#endif
|
|
|
|
#if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
|
|
|
|
#if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
|
|
!defined(__APPLE__) && !defined(_WIN32)
|
|
#error "Platform entropy sources only work on Unix and Windows, see MBEDTLS_NO_PLATFORM_ENTROPY in config.h"
|
|
#endif
|
|
|
|
#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
|
|
|
|
#if !defined(_WIN32_WINNT)
|
|
#define _WIN32_WINNT 0x0400
|
|
#endif
|
|
#include <windows.h>
|
|
#include <wincrypt.h>
|
|
|
|
int mbedtls_platform_entropy_poll( void *data, unsigned char *output, size_t len,
|
|
size_t *olen )
|
|
{
|
|
HCRYPTPROV provider;
|
|
((void) data);
|
|
*olen = 0;
|
|
|
|
if( CryptAcquireContext( &provider, NULL, NULL,
|
|
PROV_RSA_FULL, CRYPT_VERIFYCONTEXT ) == FALSE )
|
|
{
|
|
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
|
|
}
|
|
|
|
if( CryptGenRandom( provider, (DWORD) len, output ) == FALSE )
|
|
{
|
|
CryptReleaseContext( provider, 0 );
|
|
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
|
|
}
|
|
|
|
CryptReleaseContext( provider, 0 );
|
|
*olen = len;
|
|
|
|
return( 0 );
|
|
}
|
|
#else /* _WIN32 && !EFIX64 && !EFI32 */
|
|
|
|
/*
|
|
* Test for Linux getrandom() support.
|
|
* Since there is no wrapper in the libc yet, use the generic syscall wrapper
|
|
* available in GNU libc and compatible libc's (eg uClibc).
|
|
*/
|
|
#if defined(__linux__) && defined(__GLIBC__)
|
|
#include <unistd.h>
|
|
#include <sys/syscall.h>
|
|
#if defined(SYS_getrandom)
|
|
#define HAVE_GETRANDOM
|
|
|
|
static int getrandom_wrapper( void *buf, size_t buflen, unsigned int flags )
|
|
{
|
|
/* MemSan cannot understand that the syscall writes to the buffer */
|
|
#if defined(__has_feature)
|
|
#if __has_feature(memory_sanitizer)
|
|
memset( buf, 0, buflen );
|
|
#endif
|
|
#endif
|
|
|
|
return( syscall( SYS_getrandom, buf, buflen, flags ) );
|
|
}
|
|
|
|
#include <sys/utsname.h>
|
|
/* Check if version is at least 3.17.0 */
|
|
static int check_version_3_17_plus( void )
|
|
{
|
|
int minor;
|
|
struct utsname un;
|
|
const char *ver;
|
|
|
|
/* Get version information */
|
|
uname(&un);
|
|
ver = un.release;
|
|
|
|
/* Check major version; assume a single digit */
|
|
if( ver[0] < '3' || ver[0] > '9' || ver [1] != '.' )
|
|
return( -1 );
|
|
|
|
if( ver[0] - '0' > 3 )
|
|
return( 0 );
|
|
|
|
/* Ok, so now we know major == 3, check minor.
|
|
* Assume 1 or 2 digits. */
|
|
if( ver[2] < '0' || ver[2] > '9' )
|
|
return( -1 );
|
|
|
|
minor = ver[2] - '0';
|
|
|
|
if( ver[3] >= '0' && ver[3] <= '9' )
|
|
minor = 10 * minor + ver[3] - '0';
|
|
else if( ver [3] != '.' )
|
|
return( -1 );
|
|
|
|
if( minor < 17 )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
static int has_getrandom = -1;
|
|
#endif /* SYS_getrandom */
|
|
#endif /* __linux__ */
|
|
|
|
#include <stdio.h>
|
|
|
|
int mbedtls_platform_entropy_poll( void *data,
|
|
unsigned char *output, size_t len, size_t *olen )
|
|
{
|
|
FILE *file;
|
|
size_t read_len;
|
|
((void) data);
|
|
|
|
#if defined(HAVE_GETRANDOM)
|
|
if( has_getrandom == -1 )
|
|
has_getrandom = ( check_version_3_17_plus() == 0 );
|
|
|
|
if( has_getrandom )
|
|
{
|
|
int ret;
|
|
|
|
if( ( ret = getrandom_wrapper( output, len, 0 ) ) < 0 )
|
|
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
|
|
|
|
*olen = ret;
|
|
return( 0 );
|
|
}
|
|
#endif /* HAVE_GETRANDOM */
|
|
|
|
*olen = 0;
|
|
|
|
file = fopen( "/dev/urandom", "rb" );
|
|
if( file == NULL )
|
|
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
|
|
|
|
read_len = fread( output, 1, len, file );
|
|
if( read_len != len )
|
|
{
|
|
fclose( file );
|
|
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
|
|
}
|
|
|
|
fclose( file );
|
|
*olen = len;
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* _WIN32 && !EFIX64 && !EFI32 */
|
|
#endif /* !MBEDTLS_NO_PLATFORM_ENTROPY */
|
|
|
|
#if defined(MBEDTLS_TEST_NULL_ENTROPY)
|
|
int mbedtls_null_entropy_poll( void *data,
|
|
unsigned char *output, size_t len, size_t *olen )
|
|
{
|
|
((void) data);
|
|
((void) output);
|
|
*olen = 0;
|
|
|
|
if( len < sizeof(unsigned char) )
|
|
return( 0 );
|
|
|
|
*olen = sizeof(unsigned char);
|
|
|
|
return( 0 );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_TIMING_C)
|
|
int mbedtls_hardclock_poll( void *data,
|
|
unsigned char *output, size_t len, size_t *olen )
|
|
{
|
|
unsigned long timer = mbedtls_timing_hardclock();
|
|
((void) data);
|
|
*olen = 0;
|
|
|
|
if( len < sizeof(unsigned long) )
|
|
return( 0 );
|
|
|
|
memcpy( output, &timer, sizeof(unsigned long) );
|
|
*olen = sizeof(unsigned long);
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_TIMING_C */
|
|
|
|
#if defined(MBEDTLS_HAVEGE_C)
|
|
int mbedtls_havege_poll( void *data,
|
|
unsigned char *output, size_t len, size_t *olen )
|
|
{
|
|
mbedtls_havege_state *hs = (mbedtls_havege_state *) data;
|
|
*olen = 0;
|
|
|
|
if( mbedtls_havege_random( hs, output, len ) != 0 )
|
|
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
|
|
|
|
*olen = len;
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_HAVEGE_C */
|
|
|
|
#if defined(MBEDTLS_ENTROPY_NV_SEED)
|
|
int mbedtls_nv_seed_poll( void *data,
|
|
unsigned char *output, size_t len, size_t *olen )
|
|
{
|
|
unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
|
|
size_t use_len = MBEDTLS_ENTROPY_BLOCK_SIZE;
|
|
((void) data);
|
|
|
|
memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
|
|
|
|
if( mbedtls_nv_seed_read( buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) < 0 )
|
|
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
|
|
|
|
if( len < use_len )
|
|
use_len = len;
|
|
|
|
memcpy( output, buf, use_len );
|
|
*olen = use_len;
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_ENTROPY_NV_SEED */
|
|
|
|
#endif /* MBEDTLS_ENTROPY_C */
|