Nitin Shukla / LED_Demo

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Dependencies:   MAX44000 nexpaq_mdk

Fork of LED_Demo by Maxim nexpaq

mbd_os/features/mbedtls/src/entropy_poll.c@7:3a65ef12ba31, 2016-11-04 (annotated)

Committer:
nitsshukla
Date:
Fri Nov 04 12:06:04 2016 +0000
Revision:
7:3a65ef12ba31
Parent:
1:55a6170b404f 
kghj;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nexpaq 1:55a6170b404f 1 /*
nexpaq 1:55a6170b404f 2 * Platform-specific and custom entropy polling functions
nexpaq 1:55a6170b404f 3 *
nexpaq 1:55a6170b404f 4 * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
nexpaq 1:55a6170b404f 5 * SPDX-License-Identifier: Apache-2.0
nexpaq 1:55a6170b404f 6 *
nexpaq 1:55a6170b404f 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
nexpaq 1:55a6170b404f 8 * not use this file except in compliance with the License.
nexpaq 1:55a6170b404f 9 * You may obtain a copy of the License at
nexpaq 1:55a6170b404f 10 *
nexpaq 1:55a6170b404f 11 * http://www.apache.org/licenses/LICENSE-2.0
nexpaq 1:55a6170b404f 12 *
nexpaq 1:55a6170b404f 13 * Unless required by applicable law or agreed to in writing, software
nexpaq 1:55a6170b404f 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
nexpaq 1:55a6170b404f 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nexpaq 1:55a6170b404f 16 * See the License for the specific language governing permissions and
nexpaq 1:55a6170b404f 17 * limitations under the License.
nexpaq 1:55a6170b404f 18 *
nexpaq 1:55a6170b404f 19 * This file is part of mbed TLS (https://tls.mbed.org)
nexpaq 1:55a6170b404f 20 */
nexpaq 1:55a6170b404f 21
nexpaq 1:55a6170b404f 22 #if !defined(MBEDTLS_CONFIG_FILE)
nexpaq 1:55a6170b404f 23 #include "mbedtls/config.h"
nexpaq 1:55a6170b404f 24 #else
nexpaq 1:55a6170b404f 25 #include MBEDTLS_CONFIG_FILE
nexpaq 1:55a6170b404f 26 #endif
nexpaq 1:55a6170b404f 27
nexpaq 1:55a6170b404f 28 #if defined(MBEDTLS_ENTROPY_C)
nexpaq 1:55a6170b404f 29
nexpaq 1:55a6170b404f 30 #include "mbedtls/entropy.h"
nexpaq 1:55a6170b404f 31 #include "mbedtls/entropy_poll.h"
nexpaq 1:55a6170b404f 32
nexpaq 1:55a6170b404f 33 #if defined(MBEDTLS_TIMING_C)
nexpaq 1:55a6170b404f 34 #include <string.h>
nexpaq 1:55a6170b404f 35 #include "mbedtls/timing.h"
nexpaq 1:55a6170b404f 36 #endif
nexpaq 1:55a6170b404f 37 #if defined(MBEDTLS_HAVEGE_C)
nexpaq 1:55a6170b404f 38 #include "mbedtls/havege.h"
nexpaq 1:55a6170b404f 39 #endif
nexpaq 1:55a6170b404f 40 #if defined(MBEDTLS_ENTROPY_NV_SEED)
nexpaq 1:55a6170b404f 41 #include "mbedtls/platform.h"
nexpaq 1:55a6170b404f 42 #endif
nexpaq 1:55a6170b404f 43
nexpaq 1:55a6170b404f 44 #if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
nexpaq 1:55a6170b404f 45
nexpaq 1:55a6170b404f 46 #if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
nexpaq 1:55a6170b404f 47 !defined(__APPLE__) && !defined(_WIN32)
nexpaq 1:55a6170b404f 48 #error "Platform entropy sources only work on Unix and Windows, see MBEDTLS_NO_PLATFORM_ENTROPY in config.h"
nexpaq 1:55a6170b404f 49 #endif
nexpaq 1:55a6170b404f 50
nexpaq 1:55a6170b404f 51 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
nexpaq 1:55a6170b404f 52
nexpaq 1:55a6170b404f 53 #if !defined(_WIN32_WINNT)
nexpaq 1:55a6170b404f 54 #define _WIN32_WINNT 0x0400
nexpaq 1:55a6170b404f 55 #endif
nexpaq 1:55a6170b404f 56 #include <windows.h>
nexpaq 1:55a6170b404f 57 #include <wincrypt.h>
nexpaq 1:55a6170b404f 58
nexpaq 1:55a6170b404f 59 int mbedtls_platform_entropy_poll( void *data, unsigned char *output, size_t len,
nexpaq 1:55a6170b404f 60 size_t *olen )
nexpaq 1:55a6170b404f 61 {
nexpaq 1:55a6170b404f 62 HCRYPTPROV provider;
nexpaq 1:55a6170b404f 63 ((void) data);
nexpaq 1:55a6170b404f 64 *olen = 0;
nexpaq 1:55a6170b404f 65
nexpaq 1:55a6170b404f 66 if( CryptAcquireContext( &provider, NULL, NULL,
nexpaq 1:55a6170b404f 67 PROV_RSA_FULL, CRYPT_VERIFYCONTEXT ) == FALSE )
nexpaq 1:55a6170b404f 68 {
nexpaq 1:55a6170b404f 69 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
nexpaq 1:55a6170b404f 70 }
nexpaq 1:55a6170b404f 71
nexpaq 1:55a6170b404f 72 if( CryptGenRandom( provider, (DWORD) len, output ) == FALSE )
nexpaq 1:55a6170b404f 73 {
nexpaq 1:55a6170b404f 74 CryptReleaseContext( provider, 0 );
nexpaq 1:55a6170b404f 75 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
nexpaq 1:55a6170b404f 76 }
nexpaq 1:55a6170b404f 77
nexpaq 1:55a6170b404f 78 CryptReleaseContext( provider, 0 );
nexpaq 1:55a6170b404f 79 *olen = len;
nexpaq 1:55a6170b404f 80
nexpaq 1:55a6170b404f 81 return( 0 );
nexpaq 1:55a6170b404f 82 }
nexpaq 1:55a6170b404f 83 #else /* _WIN32 && !EFIX64 && !EFI32 */
nexpaq 1:55a6170b404f 84
nexpaq 1:55a6170b404f 85 /*
nexpaq 1:55a6170b404f 86 * Test for Linux getrandom() support.
nexpaq 1:55a6170b404f 87 * Since there is no wrapper in the libc yet, use the generic syscall wrapper
nexpaq 1:55a6170b404f 88 * available in GNU libc and compatible libc's (eg uClibc).
nexpaq 1:55a6170b404f 89 */
nexpaq 1:55a6170b404f 90 #if defined(__linux__) && defined(__GLIBC__)
nexpaq 1:55a6170b404f 91 #include <unistd.h>
nexpaq 1:55a6170b404f 92 #include <sys/syscall.h>
nexpaq 1:55a6170b404f 93 #if defined(SYS_getrandom)
nexpaq 1:55a6170b404f 94 #define HAVE_GETRANDOM
nexpaq 1:55a6170b404f 95
nexpaq 1:55a6170b404f 96 static int getrandom_wrapper( void *buf, size_t buflen, unsigned int flags )
nexpaq 1:55a6170b404f 97 {
nexpaq 1:55a6170b404f 98 /* MemSan cannot understand that the syscall writes to the buffer */
nexpaq 1:55a6170b404f 99 #if defined(__has_feature)
nexpaq 1:55a6170b404f 100 #if __has_feature(memory_sanitizer)
nexpaq 1:55a6170b404f 101 memset( buf, 0, buflen );
nexpaq 1:55a6170b404f 102 #endif
nexpaq 1:55a6170b404f 103 #endif
nexpaq 1:55a6170b404f 104
nexpaq 1:55a6170b404f 105 return( syscall( SYS_getrandom, buf, buflen, flags ) );
nexpaq 1:55a6170b404f 106 }
nexpaq 1:55a6170b404f 107
nexpaq 1:55a6170b404f 108 #include <sys/utsname.h>
nexpaq 1:55a6170b404f 109 /* Check if version is at least 3.17.0 */
nexpaq 1:55a6170b404f 110 static int check_version_3_17_plus( void )
nexpaq 1:55a6170b404f 111 {
nexpaq 1:55a6170b404f 112 int minor;
nexpaq 1:55a6170b404f 113 struct utsname un;
nexpaq 1:55a6170b404f 114 const char *ver;
nexpaq 1:55a6170b404f 115
nexpaq 1:55a6170b404f 116 /* Get version information */
nexpaq 1:55a6170b404f 117 uname(&un);
nexpaq 1:55a6170b404f 118 ver = un.release;
nexpaq 1:55a6170b404f 119
nexpaq 1:55a6170b404f 120 /* Check major version; assume a single digit */
nexpaq 1:55a6170b404f 121 if( ver[0] < '3' || ver[0] > '9' || ver [1] != '.' )
nexpaq 1:55a6170b404f 122 return( -1 );
nexpaq 1:55a6170b404f 123
nexpaq 1:55a6170b404f 124 if( ver[0] - '0' > 3 )
nexpaq 1:55a6170b404f 125 return( 0 );
nexpaq 1:55a6170b404f 126
nexpaq 1:55a6170b404f 127 /* Ok, so now we know major == 3, check minor.
nexpaq 1:55a6170b404f 128 * Assume 1 or 2 digits. */
nexpaq 1:55a6170b404f 129 if( ver[2] < '0' || ver[2] > '9' )
nexpaq 1:55a6170b404f 130 return( -1 );
nexpaq 1:55a6170b404f 131
nexpaq 1:55a6170b404f 132 minor = ver[2] - '0';
nexpaq 1:55a6170b404f 133
nexpaq 1:55a6170b404f 134 if( ver[3] >= '0' && ver[3] <= '9' )
nexpaq 1:55a6170b404f 135 minor = 10 * minor + ver[3] - '0';
nexpaq 1:55a6170b404f 136 else if( ver [3] != '.' )
nexpaq 1:55a6170b404f 137 return( -1 );
nexpaq 1:55a6170b404f 138
nexpaq 1:55a6170b404f 139 if( minor < 17 )
nexpaq 1:55a6170b404f 140 return( -1 );
nexpaq 1:55a6170b404f 141
nexpaq 1:55a6170b404f 142 return( 0 );
nexpaq 1:55a6170b404f 143 }
nexpaq 1:55a6170b404f 144 static int has_getrandom = -1;
nexpaq 1:55a6170b404f 145 #endif /* SYS_getrandom */
nexpaq 1:55a6170b404f 146 #endif /* __linux__ */
nexpaq 1:55a6170b404f 147
nexpaq 1:55a6170b404f 148 #include <stdio.h>
nexpaq 1:55a6170b404f 149
nexpaq 1:55a6170b404f 150 int mbedtls_platform_entropy_poll( void *data,
nexpaq 1:55a6170b404f 151 unsigned char *output, size_t len, size_t *olen )
nexpaq 1:55a6170b404f 152 {
nexpaq 1:55a6170b404f 153 FILE *file;
nexpaq 1:55a6170b404f 154 size_t read_len;
nexpaq 1:55a6170b404f 155 ((void) data);
nexpaq 1:55a6170b404f 156
nexpaq 1:55a6170b404f 157 #if defined(HAVE_GETRANDOM)
nexpaq 1:55a6170b404f 158 if( has_getrandom == -1 )
nexpaq 1:55a6170b404f 159 has_getrandom = ( check_version_3_17_plus() == 0 );
nexpaq 1:55a6170b404f 160
nexpaq 1:55a6170b404f 161 if( has_getrandom )
nexpaq 1:55a6170b404f 162 {
nexpaq 1:55a6170b404f 163 int ret;
nexpaq 1:55a6170b404f 164
nexpaq 1:55a6170b404f 165 if( ( ret = getrandom_wrapper( output, len, 0 ) ) < 0 )
nexpaq 1:55a6170b404f 166 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
nexpaq 1:55a6170b404f 167
nexpaq 1:55a6170b404f 168 *olen = ret;
nexpaq 1:55a6170b404f 169 return( 0 );
nexpaq 1:55a6170b404f 170 }
nexpaq 1:55a6170b404f 171 #endif /* HAVE_GETRANDOM */
nexpaq 1:55a6170b404f 172
nexpaq 1:55a6170b404f 173 *olen = 0;
nexpaq 1:55a6170b404f 174
nexpaq 1:55a6170b404f 175 file = fopen( "/dev/urandom", "rb" );
nexpaq 1:55a6170b404f 176 if( file == NULL )
nexpaq 1:55a6170b404f 177 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
nexpaq 1:55a6170b404f 178
nexpaq 1:55a6170b404f 179 read_len = fread( output, 1, len, file );
nexpaq 1:55a6170b404f 180 if( read_len != len )
nexpaq 1:55a6170b404f 181 {
nexpaq 1:55a6170b404f 182 fclose( file );
nexpaq 1:55a6170b404f 183 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
nexpaq 1:55a6170b404f 184 }
nexpaq 1:55a6170b404f 185
nexpaq 1:55a6170b404f 186 fclose( file );
nexpaq 1:55a6170b404f 187 *olen = len;
nexpaq 1:55a6170b404f 188
nexpaq 1:55a6170b404f 189 return( 0 );
nexpaq 1:55a6170b404f 190 }
nexpaq 1:55a6170b404f 191 #endif /* _WIN32 && !EFIX64 && !EFI32 */
nexpaq 1:55a6170b404f 192 #endif /* !MBEDTLS_NO_PLATFORM_ENTROPY */
nexpaq 1:55a6170b404f 193
nexpaq 1:55a6170b404f 194 #if defined(MBEDTLS_TEST_NULL_ENTROPY)
nexpaq 1:55a6170b404f 195 int mbedtls_null_entropy_poll( void *data,
nexpaq 1:55a6170b404f 196 unsigned char *output, size_t len, size_t *olen )
nexpaq 1:55a6170b404f 197 {
nexpaq 1:55a6170b404f 198 ((void) data);
nexpaq 1:55a6170b404f 199 ((void) output);
nexpaq 1:55a6170b404f 200 *olen = 0;
nexpaq 1:55a6170b404f 201
nexpaq 1:55a6170b404f 202 if( len < sizeof(unsigned char) )
nexpaq 1:55a6170b404f 203 return( 0 );
nexpaq 1:55a6170b404f 204
nexpaq 1:55a6170b404f 205 *olen = sizeof(unsigned char);
nexpaq 1:55a6170b404f 206
nexpaq 1:55a6170b404f 207 return( 0 );
nexpaq 1:55a6170b404f 208 }
nexpaq 1:55a6170b404f 209 #endif
nexpaq 1:55a6170b404f 210
nexpaq 1:55a6170b404f 211 #if defined(MBEDTLS_TIMING_C)
nexpaq 1:55a6170b404f 212 int mbedtls_hardclock_poll( void *data,
nexpaq 1:55a6170b404f 213 unsigned char *output, size_t len, size_t *olen )
nexpaq 1:55a6170b404f 214 {
nexpaq 1:55a6170b404f 215 unsigned long timer = mbedtls_timing_hardclock();
nexpaq 1:55a6170b404f 216 ((void) data);
nexpaq 1:55a6170b404f 217 *olen = 0;
nexpaq 1:55a6170b404f 218
nexpaq 1:55a6170b404f 219 if( len < sizeof(unsigned long) )
nexpaq 1:55a6170b404f 220 return( 0 );
nexpaq 1:55a6170b404f 221
nexpaq 1:55a6170b404f 222 memcpy( output, &timer, sizeof(unsigned long) );
nexpaq 1:55a6170b404f 223 *olen = sizeof(unsigned long);
nexpaq 1:55a6170b404f 224
nexpaq 1:55a6170b404f 225 return( 0 );
nexpaq 1:55a6170b404f 226 }
nexpaq 1:55a6170b404f 227 #endif /* MBEDTLS_TIMING_C */
nexpaq 1:55a6170b404f 228
nexpaq 1:55a6170b404f 229 #if defined(MBEDTLS_HAVEGE_C)
nexpaq 1:55a6170b404f 230 int mbedtls_havege_poll( void *data,
nexpaq 1:55a6170b404f 231 unsigned char *output, size_t len, size_t *olen )
nexpaq 1:55a6170b404f 232 {
nexpaq 1:55a6170b404f 233 mbedtls_havege_state *hs = (mbedtls_havege_state *) data;
nexpaq 1:55a6170b404f 234 *olen = 0;
nexpaq 1:55a6170b404f 235
nexpaq 1:55a6170b404f 236 if( mbedtls_havege_random( hs, output, len ) != 0 )
nexpaq 1:55a6170b404f 237 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
nexpaq 1:55a6170b404f 238
nexpaq 1:55a6170b404f 239 *olen = len;
nexpaq 1:55a6170b404f 240
nexpaq 1:55a6170b404f 241 return( 0 );
nexpaq 1:55a6170b404f 242 }
nexpaq 1:55a6170b404f 243 #endif /* MBEDTLS_HAVEGE_C */
nexpaq 1:55a6170b404f 244
nexpaq 1:55a6170b404f 245 #if defined(MBEDTLS_ENTROPY_NV_SEED)
nexpaq 1:55a6170b404f 246 int mbedtls_nv_seed_poll( void *data,
nexpaq 1:55a6170b404f 247 unsigned char *output, size_t len, size_t *olen )
nexpaq 1:55a6170b404f 248 {
nexpaq 1:55a6170b404f 249 unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
nexpaq 1:55a6170b404f 250 size_t use_len = MBEDTLS_ENTROPY_BLOCK_SIZE;
nexpaq 1:55a6170b404f 251 ((void) data);
nexpaq 1:55a6170b404f 252
nexpaq 1:55a6170b404f 253 memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
nexpaq 1:55a6170b404f 254
nexpaq 1:55a6170b404f 255 if( mbedtls_nv_seed_read( buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) < 0 )
nexpaq 1:55a6170b404f 256 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
nexpaq 1:55a6170b404f 257
nexpaq 1:55a6170b404f 258 if( len < use_len )
nexpaq 1:55a6170b404f 259 use_len = len;
nexpaq 1:55a6170b404f 260
nexpaq 1:55a6170b404f 261 memcpy( output, buf, use_len );
nexpaq 1:55a6170b404f 262 *olen = use_len;
nexpaq 1:55a6170b404f 263
nexpaq 1:55a6170b404f 264 return( 0 );
nexpaq 1:55a6170b404f 265 }
nexpaq 1:55a6170b404f 266 #endif /* MBEDTLS_ENTROPY_NV_SEED */
nexpaq 1:55a6170b404f 267
nexpaq 1:55a6170b404f 268 #endif /* MBEDTLS_ENTROPY_C */