Nathen Gallardojohnson / WNCInterface

I added functionality to get the RSSI, BER, and Cell Neighbor for reporting connection issues to M2X

Dependencies:   WncControllerK64F

mbedtls/source/entropy.c@16:8a4105d407d3, 2016-11-14 (annotated)

Committer:
JMF
Date:
Mon Nov 14 21:15:42 2016 +0000
Revision:
16:8a4105d407d3
Parent:
12:0071cb144c7a 
updated to ensure it builds with TLS by correcting config defaults.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JMF 12:0071cb144c7a 1 /*
JMF 12:0071cb144c7a 2 * Entropy accumulator implementation
JMF 12:0071cb144c7a 3 *
JMF 12:0071cb144c7a 4 * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
JMF 12:0071cb144c7a 5 * SPDX-License-Identifier: Apache-2.0
JMF 12:0071cb144c7a 6 *
JMF 12:0071cb144c7a 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
JMF 12:0071cb144c7a 8 * not use this file except in compliance with the License.
JMF 12:0071cb144c7a 9 * You may obtain a copy of the License at
JMF 12:0071cb144c7a 10 *
JMF 12:0071cb144c7a 11 * http://www.apache.org/licenses/LICENSE-2.0
JMF 12:0071cb144c7a 12 *
JMF 12:0071cb144c7a 13 * Unless required by applicable law or agreed to in writing, software
JMF 12:0071cb144c7a 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
JMF 12:0071cb144c7a 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
JMF 12:0071cb144c7a 16 * See the License for the specific language governing permissions and
JMF 12:0071cb144c7a 17 * limitations under the License.
JMF 12:0071cb144c7a 18 *
JMF 12:0071cb144c7a 19 * This file is part of mbed TLS (https://tls.mbed.org)
JMF 12:0071cb144c7a 20 */
JMF 12:0071cb144c7a 21
JMF 12:0071cb144c7a 22 #if !defined(MBEDTLS_CONFIG_FILE)
JMF 12:0071cb144c7a 23 #include "mbedtls/config.h"
JMF 12:0071cb144c7a 24 #else
JMF 12:0071cb144c7a 25 #include MBEDTLS_CONFIG_FILE
JMF 12:0071cb144c7a 26 #endif
JMF 12:0071cb144c7a 27
JMF 12:0071cb144c7a 28 #if defined(MBEDTLS_ENTROPY_C)
JMF 12:0071cb144c7a 29
JMF 12:0071cb144c7a 30 #if defined(MBEDTLS_TEST_NULL_ENTROPY)
JMF 12:0071cb144c7a 31 #warning "**** WARNING! MBEDTLS_TEST_NULL_ENTROPY defined! "
JMF 12:0071cb144c7a 32 #warning "**** THIS BUILD HAS NO DEFINED ENTROPY SOURCES "
JMF 12:0071cb144c7a 33 #warning "**** THIS BUILD IS *NOT* SUITABLE FOR PRODUCTION USE "
JMF 12:0071cb144c7a 34 #endif
JMF 12:0071cb144c7a 35
JMF 12:0071cb144c7a 36 #include "mbedtls/entropy.h"
JMF 12:0071cb144c7a 37 #include "mbedtls/entropy_poll.h"
JMF 12:0071cb144c7a 38
JMF 12:0071cb144c7a 39 #include <string.h>
JMF 12:0071cb144c7a 40
JMF 12:0071cb144c7a 41 #if defined(MBEDTLS_FS_IO)
JMF 12:0071cb144c7a 42 #include <stdio.h>
JMF 12:0071cb144c7a 43 #endif
JMF 12:0071cb144c7a 44
JMF 12:0071cb144c7a 45 #if defined(MBEDTLS_SELF_TEST)
JMF 12:0071cb144c7a 46 #if defined(MBEDTLS_PLATFORM_C)
JMF 12:0071cb144c7a 47 #include "mbedtls/platform.h"
JMF 12:0071cb144c7a 48 #else
JMF 12:0071cb144c7a 49 #include <stdio.h>
JMF 12:0071cb144c7a 50 #define mbedtls_printf pc.printf
JMF 12:0071cb144c7a 51 #endif /* MBEDTLS_PLATFORM_C */
JMF 12:0071cb144c7a 52 #endif /* MBEDTLS_SELF_TEST */
JMF 12:0071cb144c7a 53
JMF 12:0071cb144c7a 54 #if defined(MBEDTLS_HAVEGE_C)
JMF 12:0071cb144c7a 55 #include "mbedtls/havege.h"
JMF 12:0071cb144c7a 56 #endif
JMF 12:0071cb144c7a 57
JMF 12:0071cb144c7a 58 /* Implementation that should never be optimized out by the compiler */
JMF 12:0071cb144c7a 59 static void mbedtls_zeroize( void *v, size_t n ) {
JMF 12:0071cb144c7a 60 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
JMF 12:0071cb144c7a 61 }
JMF 12:0071cb144c7a 62
JMF 12:0071cb144c7a 63 #define ENTROPY_MAX_LOOP 256 /**< Maximum amount to loop before error */
JMF 12:0071cb144c7a 64
JMF 12:0071cb144c7a 65 void mbedtls_entropy_init( mbedtls_entropy_context *ctx )
JMF 12:0071cb144c7a 66 {
JMF 12:0071cb144c7a 67 memset( ctx, 0, sizeof(mbedtls_entropy_context) );
JMF 12:0071cb144c7a 68
JMF 12:0071cb144c7a 69 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 70 mbedtls_mutex_init( &ctx->mutex );
JMF 12:0071cb144c7a 71 #endif
JMF 12:0071cb144c7a 72
JMF 12:0071cb144c7a 73 #if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
JMF 12:0071cb144c7a 74 mbedtls_sha512_starts( &ctx->accumulator, 0 );
JMF 12:0071cb144c7a 75 #else
JMF 12:0071cb144c7a 76 mbedtls_sha256_starts( &ctx->accumulator, 0 );
JMF 12:0071cb144c7a 77 #endif
JMF 12:0071cb144c7a 78 #if defined(MBEDTLS_HAVEGE_C)
JMF 12:0071cb144c7a 79 mbedtls_havege_init( &ctx->havege_data );
JMF 12:0071cb144c7a 80 #endif
JMF 12:0071cb144c7a 81
JMF 12:0071cb144c7a 82 #if defined(MBEDTLS_TEST_NULL_ENTROPY)
JMF 12:0071cb144c7a 83 mbedtls_entropy_add_source( ctx, mbedtls_null_entropy_poll, NULL,
JMF 12:0071cb144c7a 84 1, MBEDTLS_ENTROPY_SOURCE_STRONG );
JMF 12:0071cb144c7a 85 #endif
JMF 12:0071cb144c7a 86
JMF 12:0071cb144c7a 87 #if !defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES)
JMF 12:0071cb144c7a 88 #if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
JMF 12:0071cb144c7a 89 mbedtls_entropy_add_source( ctx, mbedtls_platform_entropy_poll, NULL,
JMF 12:0071cb144c7a 90 MBEDTLS_ENTROPY_MIN_PLATFORM,
JMF 12:0071cb144c7a 91 MBEDTLS_ENTROPY_SOURCE_STRONG );
JMF 12:0071cb144c7a 92 #endif
JMF 12:0071cb144c7a 93 #if defined(MBEDTLS_TIMING_C)
JMF 12:0071cb144c7a 94 mbedtls_entropy_add_source( ctx, mbedtls_hardclock_poll, NULL,
JMF 12:0071cb144c7a 95 MBEDTLS_ENTROPY_MIN_HARDCLOCK,
JMF 12:0071cb144c7a 96 MBEDTLS_ENTROPY_SOURCE_WEAK );
JMF 12:0071cb144c7a 97 #endif
JMF 12:0071cb144c7a 98 #if defined(MBEDTLS_HAVEGE_C)
JMF 12:0071cb144c7a 99 mbedtls_entropy_add_source( ctx, mbedtls_havege_poll, &ctx->havege_data,
JMF 12:0071cb144c7a 100 MBEDTLS_ENTROPY_MIN_HAVEGE,
JMF 12:0071cb144c7a 101 MBEDTLS_ENTROPY_SOURCE_STRONG );
JMF 12:0071cb144c7a 102 #endif
JMF 12:0071cb144c7a 103 #if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
JMF 12:0071cb144c7a 104 mbedtls_entropy_add_source( ctx, mbedtls_hardware_poll, NULL,
JMF 12:0071cb144c7a 105 MBEDTLS_ENTROPY_MIN_HARDWARE,
JMF 12:0071cb144c7a 106 MBEDTLS_ENTROPY_SOURCE_STRONG );
JMF 12:0071cb144c7a 107 #endif
JMF 12:0071cb144c7a 108 #if defined(MBEDTLS_ENTROPY_NV_SEED)
JMF 12:0071cb144c7a 109 mbedtls_entropy_add_source( ctx, mbedtls_nv_seed_poll, NULL,
JMF 12:0071cb144c7a 110 MBEDTLS_ENTROPY_BLOCK_SIZE,
JMF 12:0071cb144c7a 111 MBEDTLS_ENTROPY_SOURCE_STRONG );
JMF 12:0071cb144c7a 112 #endif
JMF 12:0071cb144c7a 113 #endif /* MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES */
JMF 12:0071cb144c7a 114 }
JMF 12:0071cb144c7a 115
JMF 12:0071cb144c7a 116 void mbedtls_entropy_free( mbedtls_entropy_context *ctx )
JMF 12:0071cb144c7a 117 {
JMF 12:0071cb144c7a 118 #if defined(MBEDTLS_HAVEGE_C)
JMF 12:0071cb144c7a 119 mbedtls_havege_free( &ctx->havege_data );
JMF 12:0071cb144c7a 120 #endif
JMF 12:0071cb144c7a 121 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 122 mbedtls_mutex_free( &ctx->mutex );
JMF 12:0071cb144c7a 123 #endif
JMF 12:0071cb144c7a 124 mbedtls_zeroize( ctx, sizeof( mbedtls_entropy_context ) );
JMF 12:0071cb144c7a 125 }
JMF 12:0071cb144c7a 126
JMF 12:0071cb144c7a 127 int mbedtls_entropy_add_source( mbedtls_entropy_context *ctx,
JMF 12:0071cb144c7a 128 mbedtls_entropy_f_source_ptr f_source, void *p_source,
JMF 12:0071cb144c7a 129 size_t threshold, int strong )
JMF 12:0071cb144c7a 130 {
JMF 12:0071cb144c7a 131 int index, ret = 0;
JMF 12:0071cb144c7a 132
JMF 12:0071cb144c7a 133 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 134 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
JMF 12:0071cb144c7a 135 return( ret );
JMF 12:0071cb144c7a 136 #endif
JMF 12:0071cb144c7a 137
JMF 12:0071cb144c7a 138 index = ctx->source_count;
JMF 12:0071cb144c7a 139 if( index >= MBEDTLS_ENTROPY_MAX_SOURCES )
JMF 12:0071cb144c7a 140 {
JMF 12:0071cb144c7a 141 ret = MBEDTLS_ERR_ENTROPY_MAX_SOURCES;
JMF 12:0071cb144c7a 142 goto exit;
JMF 12:0071cb144c7a 143 }
JMF 12:0071cb144c7a 144
JMF 12:0071cb144c7a 145 ctx->source[index].f_source = f_source;
JMF 12:0071cb144c7a 146 ctx->source[index].p_source = p_source;
JMF 12:0071cb144c7a 147 ctx->source[index].threshold = threshold;
JMF 12:0071cb144c7a 148 ctx->source[index].strong = strong;
JMF 12:0071cb144c7a 149
JMF 12:0071cb144c7a 150 ctx->source_count++;
JMF 12:0071cb144c7a 151
JMF 12:0071cb144c7a 152 exit:
JMF 12:0071cb144c7a 153 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 154 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
JMF 12:0071cb144c7a 155 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
JMF 12:0071cb144c7a 156 #endif
JMF 12:0071cb144c7a 157
JMF 12:0071cb144c7a 158 return( ret );
JMF 12:0071cb144c7a 159 }
JMF 12:0071cb144c7a 160
JMF 12:0071cb144c7a 161 /*
JMF 12:0071cb144c7a 162 * Entropy accumulator update
JMF 12:0071cb144c7a 163 */
JMF 12:0071cb144c7a 164 static int entropy_update( mbedtls_entropy_context *ctx, unsigned char source_id,
JMF 12:0071cb144c7a 165 const unsigned char *data, size_t len )
JMF 12:0071cb144c7a 166 {
JMF 12:0071cb144c7a 167 unsigned char header[2];
JMF 12:0071cb144c7a 168 unsigned char tmp[MBEDTLS_ENTROPY_BLOCK_SIZE];
JMF 12:0071cb144c7a 169 size_t use_len = len;
JMF 12:0071cb144c7a 170 const unsigned char *p = data;
JMF 12:0071cb144c7a 171
JMF 12:0071cb144c7a 172 if( use_len > MBEDTLS_ENTROPY_BLOCK_SIZE )
JMF 12:0071cb144c7a 173 {
JMF 12:0071cb144c7a 174 #if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
JMF 12:0071cb144c7a 175 mbedtls_sha512( data, len, tmp, 0 );
JMF 12:0071cb144c7a 176 #else
JMF 12:0071cb144c7a 177 mbedtls_sha256( data, len, tmp, 0 );
JMF 12:0071cb144c7a 178 #endif
JMF 12:0071cb144c7a 179 p = tmp;
JMF 12:0071cb144c7a 180 use_len = MBEDTLS_ENTROPY_BLOCK_SIZE;
JMF 12:0071cb144c7a 181 }
JMF 12:0071cb144c7a 182
JMF 12:0071cb144c7a 183 header[0] = source_id;
JMF 12:0071cb144c7a 184 header[1] = use_len & 0xFF;
JMF 12:0071cb144c7a 185
JMF 12:0071cb144c7a 186 #if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
JMF 12:0071cb144c7a 187 mbedtls_sha512_update( &ctx->accumulator, header, 2 );
JMF 12:0071cb144c7a 188 mbedtls_sha512_update( &ctx->accumulator, p, use_len );
JMF 12:0071cb144c7a 189 #else
JMF 12:0071cb144c7a 190 mbedtls_sha256_update( &ctx->accumulator, header, 2 );
JMF 12:0071cb144c7a 191 mbedtls_sha256_update( &ctx->accumulator, p, use_len );
JMF 12:0071cb144c7a 192 #endif
JMF 12:0071cb144c7a 193
JMF 12:0071cb144c7a 194 return( 0 );
JMF 12:0071cb144c7a 195 }
JMF 12:0071cb144c7a 196
JMF 12:0071cb144c7a 197 int mbedtls_entropy_update_manual( mbedtls_entropy_context *ctx,
JMF 12:0071cb144c7a 198 const unsigned char *data, size_t len )
JMF 12:0071cb144c7a 199 {
JMF 12:0071cb144c7a 200 int ret;
JMF 12:0071cb144c7a 201
JMF 12:0071cb144c7a 202 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 203 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
JMF 12:0071cb144c7a 204 return( ret );
JMF 12:0071cb144c7a 205 #endif
JMF 12:0071cb144c7a 206
JMF 12:0071cb144c7a 207 ret = entropy_update( ctx, MBEDTLS_ENTROPY_SOURCE_MANUAL, data, len );
JMF 12:0071cb144c7a 208
JMF 12:0071cb144c7a 209 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 210 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
JMF 12:0071cb144c7a 211 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
JMF 12:0071cb144c7a 212 #endif
JMF 12:0071cb144c7a 213
JMF 12:0071cb144c7a 214 return( ret );
JMF 12:0071cb144c7a 215 }
JMF 12:0071cb144c7a 216
JMF 12:0071cb144c7a 217 /*
JMF 12:0071cb144c7a 218 * Run through the different sources to add entropy to our accumulator
JMF 12:0071cb144c7a 219 */
JMF 12:0071cb144c7a 220 static int entropy_gather_internal( mbedtls_entropy_context *ctx )
JMF 12:0071cb144c7a 221 {
JMF 12:0071cb144c7a 222 int ret, i, have_one_strong = 0;
JMF 12:0071cb144c7a 223 unsigned char buf[MBEDTLS_ENTROPY_MAX_GATHER];
JMF 12:0071cb144c7a 224 size_t olen;
JMF 12:0071cb144c7a 225
JMF 12:0071cb144c7a 226 if( ctx->source_count == 0 )
JMF 12:0071cb144c7a 227 return( MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED );
JMF 12:0071cb144c7a 228
JMF 12:0071cb144c7a 229 /*
JMF 12:0071cb144c7a 230 * Run through our entropy sources
JMF 12:0071cb144c7a 231 */
JMF 12:0071cb144c7a 232 for( i = 0; i < ctx->source_count; i++ )
JMF 12:0071cb144c7a 233 {
JMF 12:0071cb144c7a 234 if( ctx->source[i].strong == MBEDTLS_ENTROPY_SOURCE_STRONG )
JMF 12:0071cb144c7a 235 have_one_strong = 1;
JMF 12:0071cb144c7a 236
JMF 12:0071cb144c7a 237 olen = 0;
JMF 12:0071cb144c7a 238 if( ( ret = ctx->source[i].f_source( ctx->source[i].p_source,
JMF 12:0071cb144c7a 239 buf, MBEDTLS_ENTROPY_MAX_GATHER, &olen ) ) != 0 )
JMF 12:0071cb144c7a 240 {
JMF 12:0071cb144c7a 241 return( ret );
JMF 12:0071cb144c7a 242 }
JMF 12:0071cb144c7a 243
JMF 12:0071cb144c7a 244 /*
JMF 12:0071cb144c7a 245 * Add if we actually gathered something
JMF 12:0071cb144c7a 246 */
JMF 12:0071cb144c7a 247 if( olen > 0 )
JMF 12:0071cb144c7a 248 {
JMF 12:0071cb144c7a 249 entropy_update( ctx, (unsigned char) i, buf, olen );
JMF 12:0071cb144c7a 250 ctx->source[i].size += olen;
JMF 12:0071cb144c7a 251 }
JMF 12:0071cb144c7a 252 }
JMF 12:0071cb144c7a 253
JMF 12:0071cb144c7a 254 if( have_one_strong == 0 )
JMF 12:0071cb144c7a 255 return( MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE );
JMF 12:0071cb144c7a 256
JMF 12:0071cb144c7a 257 return( 0 );
JMF 12:0071cb144c7a 258 }
JMF 12:0071cb144c7a 259
JMF 12:0071cb144c7a 260 /*
JMF 12:0071cb144c7a 261 * Thread-safe wrapper for entropy_gather_internal()
JMF 12:0071cb144c7a 262 */
JMF 12:0071cb144c7a 263 int mbedtls_entropy_gather( mbedtls_entropy_context *ctx )
JMF 12:0071cb144c7a 264 {
JMF 12:0071cb144c7a 265 int ret;
JMF 12:0071cb144c7a 266
JMF 12:0071cb144c7a 267 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 268 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
JMF 12:0071cb144c7a 269 return( ret );
JMF 12:0071cb144c7a 270 #endif
JMF 12:0071cb144c7a 271
JMF 12:0071cb144c7a 272 ret = entropy_gather_internal( ctx );
JMF 12:0071cb144c7a 273
JMF 12:0071cb144c7a 274 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 275 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
JMF 12:0071cb144c7a 276 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
JMF 12:0071cb144c7a 277 #endif
JMF 12:0071cb144c7a 278
JMF 12:0071cb144c7a 279 return( ret );
JMF 12:0071cb144c7a 280 }
JMF 12:0071cb144c7a 281
JMF 12:0071cb144c7a 282 int mbedtls_entropy_func( void *data, unsigned char *output, size_t len )
JMF 12:0071cb144c7a 283 {
JMF 12:0071cb144c7a 284 int ret, count = 0, i, done;
JMF 12:0071cb144c7a 285 mbedtls_entropy_context *ctx = (mbedtls_entropy_context *) data;
JMF 12:0071cb144c7a 286 unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
JMF 12:0071cb144c7a 287
JMF 12:0071cb144c7a 288 if( len > MBEDTLS_ENTROPY_BLOCK_SIZE )
JMF 12:0071cb144c7a 289 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
JMF 12:0071cb144c7a 290
JMF 12:0071cb144c7a 291 #if defined(MBEDTLS_ENTROPY_NV_SEED)
JMF 12:0071cb144c7a 292 /* Update the NV entropy seed before generating any entropy for outside
JMF 12:0071cb144c7a 293 * use.
JMF 12:0071cb144c7a 294 */
JMF 12:0071cb144c7a 295 if( ctx->initial_entropy_run == 0 )
JMF 12:0071cb144c7a 296 {
JMF 12:0071cb144c7a 297 ctx->initial_entropy_run = 1;
JMF 12:0071cb144c7a 298 if( ( ret = mbedtls_entropy_update_nv_seed( ctx ) ) != 0 )
JMF 12:0071cb144c7a 299 return( ret );
JMF 12:0071cb144c7a 300 }
JMF 12:0071cb144c7a 301 #endif
JMF 12:0071cb144c7a 302
JMF 12:0071cb144c7a 303 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 304 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
JMF 12:0071cb144c7a 305 return( ret );
JMF 12:0071cb144c7a 306 #endif
JMF 12:0071cb144c7a 307
JMF 12:0071cb144c7a 308 /*
JMF 12:0071cb144c7a 309 * Always gather extra entropy before a call
JMF 12:0071cb144c7a 310 */
JMF 12:0071cb144c7a 311 do
JMF 12:0071cb144c7a 312 {
JMF 12:0071cb144c7a 313 if( count++ > ENTROPY_MAX_LOOP )
JMF 12:0071cb144c7a 314 {
JMF 12:0071cb144c7a 315 ret = MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
JMF 12:0071cb144c7a 316 goto exit;
JMF 12:0071cb144c7a 317 }
JMF 12:0071cb144c7a 318
JMF 12:0071cb144c7a 319 if( ( ret = entropy_gather_internal( ctx ) ) != 0 )
JMF 12:0071cb144c7a 320 goto exit;
JMF 12:0071cb144c7a 321
JMF 12:0071cb144c7a 322 done = 1;
JMF 12:0071cb144c7a 323 for( i = 0; i < ctx->source_count; i++ )
JMF 12:0071cb144c7a 324 if( ctx->source[i].size < ctx->source[i].threshold )
JMF 12:0071cb144c7a 325 done = 0;
JMF 12:0071cb144c7a 326 }
JMF 12:0071cb144c7a 327 while( ! done );
JMF 12:0071cb144c7a 328
JMF 12:0071cb144c7a 329 memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
JMF 12:0071cb144c7a 330
JMF 12:0071cb144c7a 331 #if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
JMF 12:0071cb144c7a 332 mbedtls_sha512_finish( &ctx->accumulator, buf );
JMF 12:0071cb144c7a 333
JMF 12:0071cb144c7a 334 /*
JMF 12:0071cb144c7a 335 * Reset accumulator and counters and recycle existing entropy
JMF 12:0071cb144c7a 336 */
JMF 12:0071cb144c7a 337 memset( &ctx->accumulator, 0, sizeof( mbedtls_sha512_context ) );
JMF 12:0071cb144c7a 338 mbedtls_sha512_starts( &ctx->accumulator, 0 );
JMF 12:0071cb144c7a 339 mbedtls_sha512_update( &ctx->accumulator, buf, MBEDTLS_ENTROPY_BLOCK_SIZE );
JMF 12:0071cb144c7a 340
JMF 12:0071cb144c7a 341 /*
JMF 12:0071cb144c7a 342 * Perform second SHA-512 on entropy
JMF 12:0071cb144c7a 343 */
JMF 12:0071cb144c7a 344 mbedtls_sha512( buf, MBEDTLS_ENTROPY_BLOCK_SIZE, buf, 0 );
JMF 12:0071cb144c7a 345 #else /* MBEDTLS_ENTROPY_SHA512_ACCUMULATOR */
JMF 12:0071cb144c7a 346 mbedtls_sha256_finish( &ctx->accumulator, buf );
JMF 12:0071cb144c7a 347
JMF 12:0071cb144c7a 348 /*
JMF 12:0071cb144c7a 349 * Reset accumulator and counters and recycle existing entropy
JMF 12:0071cb144c7a 350 */
JMF 12:0071cb144c7a 351 memset( &ctx->accumulator, 0, sizeof( mbedtls_sha256_context ) );
JMF 12:0071cb144c7a 352 mbedtls_sha256_starts( &ctx->accumulator, 0 );
JMF 12:0071cb144c7a 353 mbedtls_sha256_update( &ctx->accumulator, buf, MBEDTLS_ENTROPY_BLOCK_SIZE );
JMF 12:0071cb144c7a 354
JMF 12:0071cb144c7a 355 /*
JMF 12:0071cb144c7a 356 * Perform second SHA-256 on entropy
JMF 12:0071cb144c7a 357 */
JMF 12:0071cb144c7a 358 mbedtls_sha256( buf, MBEDTLS_ENTROPY_BLOCK_SIZE, buf, 0 );
JMF 12:0071cb144c7a 359 #endif /* MBEDTLS_ENTROPY_SHA512_ACCUMULATOR */
JMF 12:0071cb144c7a 360
JMF 12:0071cb144c7a 361 for( i = 0; i < ctx->source_count; i++ )
JMF 12:0071cb144c7a 362 ctx->source[i].size = 0;
JMF 12:0071cb144c7a 363
JMF 12:0071cb144c7a 364 memcpy( output, buf, len );
JMF 12:0071cb144c7a 365
JMF 12:0071cb144c7a 366 ret = 0;
JMF 12:0071cb144c7a 367
JMF 12:0071cb144c7a 368 exit:
JMF 12:0071cb144c7a 369 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 370 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
JMF 12:0071cb144c7a 371 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
JMF 12:0071cb144c7a 372 #endif
JMF 12:0071cb144c7a 373
JMF 12:0071cb144c7a 374 return( ret );
JMF 12:0071cb144c7a 375 }
JMF 12:0071cb144c7a 376
JMF 12:0071cb144c7a 377 #if defined(MBEDTLS_ENTROPY_NV_SEED)
JMF 12:0071cb144c7a 378 int mbedtls_entropy_update_nv_seed( mbedtls_entropy_context *ctx )
JMF 12:0071cb144c7a 379 {
JMF 12:0071cb144c7a 380 int ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR;
JMF 12:0071cb144c7a 381 unsigned char buf[ MBEDTLS_ENTROPY_MAX_SEED_SIZE ];
JMF 12:0071cb144c7a 382
JMF 12:0071cb144c7a 383 /* Read new seed and write it to NV */
JMF 12:0071cb144c7a 384 if( ( ret = mbedtls_entropy_func( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 )
JMF 12:0071cb144c7a 385 return( ret );
JMF 12:0071cb144c7a 386
JMF 12:0071cb144c7a 387 if( mbedtls_nv_seed_write( buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) < 0 )
JMF 12:0071cb144c7a 388 return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR );
JMF 12:0071cb144c7a 389
JMF 12:0071cb144c7a 390 /* Manually update the remaining stream with a separator value to diverge */
JMF 12:0071cb144c7a 391 memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
JMF 12:0071cb144c7a 392 mbedtls_entropy_update_manual( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE );
JMF 12:0071cb144c7a 393
JMF 12:0071cb144c7a 394 return( 0 );
JMF 12:0071cb144c7a 395 }
JMF 12:0071cb144c7a 396 #endif /* MBEDTLS_ENTROPY_NV_SEED */
JMF 12:0071cb144c7a 397
JMF 12:0071cb144c7a 398 #if defined(MBEDTLS_FS_IO)
JMF 12:0071cb144c7a 399 int mbedtls_entropy_write_seed_file( mbedtls_entropy_context *ctx, const char *path )
JMF 12:0071cb144c7a 400 {
JMF 12:0071cb144c7a 401 int ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR;
JMF 12:0071cb144c7a 402 FILE *f;
JMF 12:0071cb144c7a 403 unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
JMF 12:0071cb144c7a 404
JMF 12:0071cb144c7a 405 if( ( f = fopen( path, "wb" ) ) == NULL )
JMF 12:0071cb144c7a 406 return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR );
JMF 12:0071cb144c7a 407
JMF 12:0071cb144c7a 408 if( ( ret = mbedtls_entropy_func( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 )
JMF 12:0071cb144c7a 409 goto exit;
JMF 12:0071cb144c7a 410
JMF 12:0071cb144c7a 411 if( fwrite( buf, 1, MBEDTLS_ENTROPY_BLOCK_SIZE, f ) != MBEDTLS_ENTROPY_BLOCK_SIZE )
JMF 12:0071cb144c7a 412 {
JMF 12:0071cb144c7a 413 ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR;
JMF 12:0071cb144c7a 414 goto exit;
JMF 12:0071cb144c7a 415 }
JMF 12:0071cb144c7a 416
JMF 12:0071cb144c7a 417 ret = 0;
JMF 12:0071cb144c7a 418
JMF 12:0071cb144c7a 419 exit:
JMF 12:0071cb144c7a 420 fclose( f );
JMF 12:0071cb144c7a 421 return( ret );
JMF 12:0071cb144c7a 422 }
JMF 12:0071cb144c7a 423
JMF 12:0071cb144c7a 424 int mbedtls_entropy_update_seed_file( mbedtls_entropy_context *ctx, const char *path )
JMF 12:0071cb144c7a 425 {
JMF 12:0071cb144c7a 426 FILE *f;
JMF 12:0071cb144c7a 427 size_t n;
JMF 12:0071cb144c7a 428 unsigned char buf[ MBEDTLS_ENTROPY_MAX_SEED_SIZE ];
JMF 12:0071cb144c7a 429
JMF 12:0071cb144c7a 430 if( ( f = fopen( path, "rb" ) ) == NULL )
JMF 12:0071cb144c7a 431 return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR );
JMF 12:0071cb144c7a 432
JMF 12:0071cb144c7a 433 fseek( f, 0, SEEK_END );
JMF 12:0071cb144c7a 434 n = (size_t) ftell( f );
JMF 12:0071cb144c7a 435 fseek( f, 0, SEEK_SET );
JMF 12:0071cb144c7a 436
JMF 12:0071cb144c7a 437 if( n > MBEDTLS_ENTROPY_MAX_SEED_SIZE )
JMF 12:0071cb144c7a 438 n = MBEDTLS_ENTROPY_MAX_SEED_SIZE;
JMF 12:0071cb144c7a 439
JMF 12:0071cb144c7a 440 if( fread( buf, 1, n, f ) != n )
JMF 12:0071cb144c7a 441 {
JMF 12:0071cb144c7a 442 fclose( f );
JMF 12:0071cb144c7a 443 return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR );
JMF 12:0071cb144c7a 444 }
JMF 12:0071cb144c7a 445
JMF 12:0071cb144c7a 446 fclose( f );
JMF 12:0071cb144c7a 447
JMF 12:0071cb144c7a 448 mbedtls_entropy_update_manual( ctx, buf, n );
JMF 12:0071cb144c7a 449
JMF 12:0071cb144c7a 450 return( mbedtls_entropy_write_seed_file( ctx, path ) );
JMF 12:0071cb144c7a 451 }
JMF 12:0071cb144c7a 452 #endif /* MBEDTLS_FS_IO */
JMF 12:0071cb144c7a 453
JMF 12:0071cb144c7a 454 #if defined(MBEDTLS_SELF_TEST)
JMF 12:0071cb144c7a 455 /*
JMF 12:0071cb144c7a 456 * Dummy source function
JMF 12:0071cb144c7a 457 */
JMF 12:0071cb144c7a 458 static int entropy_dummy_source( void *data, unsigned char *output,
JMF 12:0071cb144c7a 459 size_t len, size_t *olen )
JMF 12:0071cb144c7a 460 {
JMF 12:0071cb144c7a 461 ((void) data);
JMF 12:0071cb144c7a 462
JMF 12:0071cb144c7a 463 memset( output, 0x2a, len );
JMF 12:0071cb144c7a 464 *olen = len;
JMF 12:0071cb144c7a 465
JMF 12:0071cb144c7a 466 return( 0 );
JMF 12:0071cb144c7a 467 }
JMF 12:0071cb144c7a 468
JMF 12:0071cb144c7a 469 /*
JMF 12:0071cb144c7a 470 * The actual entropy quality is hard to test, but we can at least
JMF 12:0071cb144c7a 471 * test that the functions don't cause errors and write the correct
JMF 12:0071cb144c7a 472 * amount of data to buffers.
JMF 12:0071cb144c7a 473 */
JMF 12:0071cb144c7a 474 int mbedtls_entropy_self_test( int verbose )
JMF 12:0071cb144c7a 475 {
JMF 12:0071cb144c7a 476 int ret = 0;
JMF 12:0071cb144c7a 477 mbedtls_entropy_context ctx;
JMF 12:0071cb144c7a 478 unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 };
JMF 12:0071cb144c7a 479 unsigned char acc[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 };
JMF 12:0071cb144c7a 480 size_t i, j;
JMF 12:0071cb144c7a 481
JMF 12:0071cb144c7a 482 if( verbose != 0 )
JMF 12:0071cb144c7a 483 mbedtls_printf( " ENTROPY test: " );
JMF 12:0071cb144c7a 484
JMF 12:0071cb144c7a 485 mbedtls_entropy_init( &ctx );
JMF 12:0071cb144c7a 486
JMF 12:0071cb144c7a 487 /* First do a gather to make sure we have default sources */
JMF 12:0071cb144c7a 488 if( ( ret = mbedtls_entropy_gather( &ctx ) ) != 0 )
JMF 12:0071cb144c7a 489 goto cleanup;
JMF 12:0071cb144c7a 490
JMF 12:0071cb144c7a 491 ret = mbedtls_entropy_add_source( &ctx, entropy_dummy_source, NULL, 16,
JMF 12:0071cb144c7a 492 MBEDTLS_ENTROPY_SOURCE_WEAK );
JMF 12:0071cb144c7a 493 if( ret != 0 )
JMF 12:0071cb144c7a 494 goto cleanup;
JMF 12:0071cb144c7a 495
JMF 12:0071cb144c7a 496 if( ( ret = mbedtls_entropy_update_manual( &ctx, buf, sizeof buf ) ) != 0 )
JMF 12:0071cb144c7a 497 goto cleanup;
JMF 12:0071cb144c7a 498
JMF 12:0071cb144c7a 499 /*
JMF 12:0071cb144c7a 500 * To test that mbedtls_entropy_func writes correct number of bytes:
JMF 12:0071cb144c7a 501 * - use the whole buffer and rely on ASan to detect overruns
JMF 12:0071cb144c7a 502 * - collect entropy 8 times and OR the result in an accumulator:
JMF 12:0071cb144c7a 503 * any byte should then be 0 with probably 2^(-64), so requiring
JMF 12:0071cb144c7a 504 * each of the 32 or 64 bytes to be non-zero has a false failure rate
JMF 12:0071cb144c7a 505 * of at most 2^(-58) which is acceptable.
JMF 12:0071cb144c7a 506 */
JMF 12:0071cb144c7a 507 for( i = 0; i < 8; i++ )
JMF 12:0071cb144c7a 508 {
JMF 12:0071cb144c7a 509 if( ( ret = mbedtls_entropy_func( &ctx, buf, sizeof( buf ) ) ) != 0 )
JMF 12:0071cb144c7a 510 goto cleanup;
JMF 12:0071cb144c7a 511
JMF 12:0071cb144c7a 512 for( j = 0; j < sizeof( buf ); j++ )
JMF 12:0071cb144c7a 513 acc[j] |= buf[j];
JMF 12:0071cb144c7a 514 }
JMF 12:0071cb144c7a 515
JMF 12:0071cb144c7a 516 for( j = 0; j < sizeof( buf ); j++ )
JMF 12:0071cb144c7a 517 {
JMF 12:0071cb144c7a 518 if( acc[j] == 0 )
JMF 12:0071cb144c7a 519 {
JMF 12:0071cb144c7a 520 ret = 1;
JMF 12:0071cb144c7a 521 goto cleanup;
JMF 12:0071cb144c7a 522 }
JMF 12:0071cb144c7a 523 }
JMF 12:0071cb144c7a 524
JMF 12:0071cb144c7a 525 cleanup:
JMF 12:0071cb144c7a 526 mbedtls_entropy_free( &ctx );
JMF 12:0071cb144c7a 527
JMF 12:0071cb144c7a 528 if( verbose != 0 )
JMF 12:0071cb144c7a 529 {
JMF 12:0071cb144c7a 530 if( ret != 0 )
JMF 12:0071cb144c7a 531 mbedtls_printf( "failed\n" );
JMF 12:0071cb144c7a 532 else
JMF 12:0071cb144c7a 533 mbedtls_printf( "passed\n" );
JMF 12:0071cb144c7a 534
JMF 12:0071cb144c7a 535 mbedtls_printf( "\n" );
JMF 12:0071cb144c7a 536 }
JMF 12:0071cb144c7a 537
JMF 12:0071cb144c7a 538 return( ret != 0 );
JMF 12:0071cb144c7a 539 }
JMF 12:0071cb144c7a 540 #endif /* MBEDTLS_SELF_TEST */
JMF 12:0071cb144c7a 541
JMF 12:0071cb144c7a 542 #endif /* MBEDTLS_ENTROPY_C */