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Fork of
OmniWheels
by 
Gustav Atmel
mbed-os/features/mbedtls/src/entropy.c@1:9c5af431a1f1, 2018-05-01 (annotated)
- Committer:
- gustavatmel
- Date:
- Tue May 01 15:47:08 2018 +0000
- Revision:
- 1:9c5af431a1f1
sdf
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| gustavatmel | 1:9c5af431a1f1 | 1 | /* |
| gustavatmel | 1:9c5af431a1f1 | 2 | * Entropy accumulator implementation |
| gustavatmel | 1:9c5af431a1f1 | 3 | * |
| gustavatmel | 1:9c5af431a1f1 | 4 | * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved |
| gustavatmel | 1:9c5af431a1f1 | 5 | * SPDX-License-Identifier: Apache-2.0 |
| gustavatmel | 1:9c5af431a1f1 | 6 | * |
| gustavatmel | 1:9c5af431a1f1 | 7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| gustavatmel | 1:9c5af431a1f1 | 8 | * not use this file except in compliance with the License. |
| gustavatmel | 1:9c5af431a1f1 | 9 | * You may obtain a copy of the License at |
| gustavatmel | 1:9c5af431a1f1 | 10 | * |
| gustavatmel | 1:9c5af431a1f1 | 11 | * http://www.apache.org/licenses/LICENSE-2.0 |
| gustavatmel | 1:9c5af431a1f1 | 12 | * |
| gustavatmel | 1:9c5af431a1f1 | 13 | * Unless required by applicable law or agreed to in writing, software |
| gustavatmel | 1:9c5af431a1f1 | 14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| gustavatmel | 1:9c5af431a1f1 | 15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| gustavatmel | 1:9c5af431a1f1 | 16 | * See the License for the specific language governing permissions and |
| gustavatmel | 1:9c5af431a1f1 | 17 | * limitations under the License. |
| gustavatmel | 1:9c5af431a1f1 | 18 | * |
| gustavatmel | 1:9c5af431a1f1 | 19 | * This file is part of mbed TLS (https://tls.mbed.org) |
| gustavatmel | 1:9c5af431a1f1 | 20 | */ |
| gustavatmel | 1:9c5af431a1f1 | 21 | |
| gustavatmel | 1:9c5af431a1f1 | 22 | #if !defined(MBEDTLS_CONFIG_FILE) |
| gustavatmel | 1:9c5af431a1f1 | 23 | #include "mbedtls/config.h" |
| gustavatmel | 1:9c5af431a1f1 | 24 | #else |
| gustavatmel | 1:9c5af431a1f1 | 25 | #include MBEDTLS_CONFIG_FILE |
| gustavatmel | 1:9c5af431a1f1 | 26 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 27 | |
| gustavatmel | 1:9c5af431a1f1 | 28 | #if defined(MBEDTLS_ENTROPY_C) |
| gustavatmel | 1:9c5af431a1f1 | 29 | |
| gustavatmel | 1:9c5af431a1f1 | 30 | #if defined(MBEDTLS_TEST_NULL_ENTROPY) |
| gustavatmel | 1:9c5af431a1f1 | 31 | #warning "**** WARNING! MBEDTLS_TEST_NULL_ENTROPY defined! " |
| gustavatmel | 1:9c5af431a1f1 | 32 | #warning "**** THIS BUILD HAS NO DEFINED ENTROPY SOURCES " |
| gustavatmel | 1:9c5af431a1f1 | 33 | #warning "**** THIS BUILD IS *NOT* SUITABLE FOR PRODUCTION USE " |
| gustavatmel | 1:9c5af431a1f1 | 34 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 35 | |
| gustavatmel | 1:9c5af431a1f1 | 36 | #include "mbedtls/entropy.h" |
| gustavatmel | 1:9c5af431a1f1 | 37 | #include "mbedtls/entropy_poll.h" |
| gustavatmel | 1:9c5af431a1f1 | 38 | |
| gustavatmel | 1:9c5af431a1f1 | 39 | #include <string.h> |
| gustavatmel | 1:9c5af431a1f1 | 40 | |
| gustavatmel | 1:9c5af431a1f1 | 41 | #if defined(MBEDTLS_FS_IO) |
| gustavatmel | 1:9c5af431a1f1 | 42 | #include <stdio.h> |
| gustavatmel | 1:9c5af431a1f1 | 43 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 44 | |
| gustavatmel | 1:9c5af431a1f1 | 45 | #if defined(MBEDTLS_ENTROPY_NV_SEED) |
| gustavatmel | 1:9c5af431a1f1 | 46 | #include "mbedtls/platform.h" |
| gustavatmel | 1:9c5af431a1f1 | 47 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 48 | |
| gustavatmel | 1:9c5af431a1f1 | 49 | #if defined(MBEDTLS_SELF_TEST) |
| gustavatmel | 1:9c5af431a1f1 | 50 | #if defined(MBEDTLS_PLATFORM_C) |
| gustavatmel | 1:9c5af431a1f1 | 51 | #include "mbedtls/platform.h" |
| gustavatmel | 1:9c5af431a1f1 | 52 | #else |
| gustavatmel | 1:9c5af431a1f1 | 53 | #include <stdio.h> |
| gustavatmel | 1:9c5af431a1f1 | 54 | #define mbedtls_printf printf |
| gustavatmel | 1:9c5af431a1f1 | 55 | #endif /* MBEDTLS_PLATFORM_C */ |
| gustavatmel | 1:9c5af431a1f1 | 56 | #endif /* MBEDTLS_SELF_TEST */ |
| gustavatmel | 1:9c5af431a1f1 | 57 | |
| gustavatmel | 1:9c5af431a1f1 | 58 | #if defined(MBEDTLS_HAVEGE_C) |
| gustavatmel | 1:9c5af431a1f1 | 59 | #include "mbedtls/havege.h" |
| gustavatmel | 1:9c5af431a1f1 | 60 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 61 | |
| gustavatmel | 1:9c5af431a1f1 | 62 | /* Implementation that should never be optimized out by the compiler */ |
| gustavatmel | 1:9c5af431a1f1 | 63 | static void mbedtls_zeroize( void *v, size_t n ) { |
| gustavatmel | 1:9c5af431a1f1 | 64 | volatile unsigned char *p = v; while( n-- ) *p++ = 0; |
| gustavatmel | 1:9c5af431a1f1 | 65 | } |
| gustavatmel | 1:9c5af431a1f1 | 66 | |
| gustavatmel | 1:9c5af431a1f1 | 67 | #define ENTROPY_MAX_LOOP 256 /**< Maximum amount to loop before error */ |
| gustavatmel | 1:9c5af431a1f1 | 68 | |
| gustavatmel | 1:9c5af431a1f1 | 69 | void mbedtls_entropy_init( mbedtls_entropy_context *ctx ) |
| gustavatmel | 1:9c5af431a1f1 | 70 | { |
| gustavatmel | 1:9c5af431a1f1 | 71 | ctx->source_count = 0; |
| gustavatmel | 1:9c5af431a1f1 | 72 | memset( ctx->source, 0, sizeof( ctx->source ) ); |
| gustavatmel | 1:9c5af431a1f1 | 73 | |
| gustavatmel | 1:9c5af431a1f1 | 74 | #if defined(MBEDTLS_THREADING_C) |
| gustavatmel | 1:9c5af431a1f1 | 75 | mbedtls_mutex_init( &ctx->mutex ); |
| gustavatmel | 1:9c5af431a1f1 | 76 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 77 | |
| gustavatmel | 1:9c5af431a1f1 | 78 | ctx->accumulator_started = 0; |
| gustavatmel | 1:9c5af431a1f1 | 79 | #if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR) |
| gustavatmel | 1:9c5af431a1f1 | 80 | mbedtls_sha512_init( &ctx->accumulator ); |
| gustavatmel | 1:9c5af431a1f1 | 81 | #else |
| gustavatmel | 1:9c5af431a1f1 | 82 | mbedtls_sha256_init( &ctx->accumulator ); |
| gustavatmel | 1:9c5af431a1f1 | 83 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 84 | #if defined(MBEDTLS_HAVEGE_C) |
| gustavatmel | 1:9c5af431a1f1 | 85 | mbedtls_havege_init( &ctx->havege_data ); |
| gustavatmel | 1:9c5af431a1f1 | 86 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 87 | |
| gustavatmel | 1:9c5af431a1f1 | 88 | /* Reminder: Update ENTROPY_HAVE_STRONG in the test files |
| gustavatmel | 1:9c5af431a1f1 | 89 | * when adding more strong entropy sources here. */ |
| gustavatmel | 1:9c5af431a1f1 | 90 | |
| gustavatmel | 1:9c5af431a1f1 | 91 | #if defined(MBEDTLS_TEST_NULL_ENTROPY) |
| gustavatmel | 1:9c5af431a1f1 | 92 | mbedtls_entropy_add_source( ctx, mbedtls_null_entropy_poll, NULL, |
| gustavatmel | 1:9c5af431a1f1 | 93 | 1, MBEDTLS_ENTROPY_SOURCE_STRONG ); |
| gustavatmel | 1:9c5af431a1f1 | 94 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 95 | |
| gustavatmel | 1:9c5af431a1f1 | 96 | #if !defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES) |
| gustavatmel | 1:9c5af431a1f1 | 97 | #if !defined(MBEDTLS_NO_PLATFORM_ENTROPY) |
| gustavatmel | 1:9c5af431a1f1 | 98 | mbedtls_entropy_add_source( ctx, mbedtls_platform_entropy_poll, NULL, |
| gustavatmel | 1:9c5af431a1f1 | 99 | MBEDTLS_ENTROPY_MIN_PLATFORM, |
| gustavatmel | 1:9c5af431a1f1 | 100 | MBEDTLS_ENTROPY_SOURCE_STRONG ); |
| gustavatmel | 1:9c5af431a1f1 | 101 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 102 | #if defined(MBEDTLS_TIMING_C) |
| gustavatmel | 1:9c5af431a1f1 | 103 | mbedtls_entropy_add_source( ctx, mbedtls_hardclock_poll, NULL, |
| gustavatmel | 1:9c5af431a1f1 | 104 | MBEDTLS_ENTROPY_MIN_HARDCLOCK, |
| gustavatmel | 1:9c5af431a1f1 | 105 | MBEDTLS_ENTROPY_SOURCE_WEAK ); |
| gustavatmel | 1:9c5af431a1f1 | 106 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 107 | #if defined(MBEDTLS_HAVEGE_C) |
| gustavatmel | 1:9c5af431a1f1 | 108 | mbedtls_entropy_add_source( ctx, mbedtls_havege_poll, &ctx->havege_data, |
| gustavatmel | 1:9c5af431a1f1 | 109 | MBEDTLS_ENTROPY_MIN_HAVEGE, |
| gustavatmel | 1:9c5af431a1f1 | 110 | MBEDTLS_ENTROPY_SOURCE_STRONG ); |
| gustavatmel | 1:9c5af431a1f1 | 111 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 112 | #if defined(MBEDTLS_ENTROPY_HARDWARE_ALT) |
| gustavatmel | 1:9c5af431a1f1 | 113 | mbedtls_entropy_add_source( ctx, mbedtls_hardware_poll, NULL, |
| gustavatmel | 1:9c5af431a1f1 | 114 | MBEDTLS_ENTROPY_MIN_HARDWARE, |
| gustavatmel | 1:9c5af431a1f1 | 115 | MBEDTLS_ENTROPY_SOURCE_STRONG ); |
| gustavatmel | 1:9c5af431a1f1 | 116 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 117 | #if defined(MBEDTLS_ENTROPY_NV_SEED) |
| gustavatmel | 1:9c5af431a1f1 | 118 | mbedtls_entropy_add_source( ctx, mbedtls_nv_seed_poll, NULL, |
| gustavatmel | 1:9c5af431a1f1 | 119 | MBEDTLS_ENTROPY_BLOCK_SIZE, |
| gustavatmel | 1:9c5af431a1f1 | 120 | MBEDTLS_ENTROPY_SOURCE_STRONG ); |
| gustavatmel | 1:9c5af431a1f1 | 121 | ctx->initial_entropy_run = 0; |
| gustavatmel | 1:9c5af431a1f1 | 122 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 123 | #endif /* MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES */ |
| gustavatmel | 1:9c5af431a1f1 | 124 | } |
| gustavatmel | 1:9c5af431a1f1 | 125 | |
| gustavatmel | 1:9c5af431a1f1 | 126 | void mbedtls_entropy_free( mbedtls_entropy_context *ctx ) |
| gustavatmel | 1:9c5af431a1f1 | 127 | { |
| gustavatmel | 1:9c5af431a1f1 | 128 | #if defined(MBEDTLS_HAVEGE_C) |
| gustavatmel | 1:9c5af431a1f1 | 129 | mbedtls_havege_free( &ctx->havege_data ); |
| gustavatmel | 1:9c5af431a1f1 | 130 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 131 | #if defined(MBEDTLS_THREADING_C) |
| gustavatmel | 1:9c5af431a1f1 | 132 | mbedtls_mutex_free( &ctx->mutex ); |
| gustavatmel | 1:9c5af431a1f1 | 133 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 134 | #if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR) |
| gustavatmel | 1:9c5af431a1f1 | 135 | mbedtls_sha512_free( &ctx->accumulator ); |
| gustavatmel | 1:9c5af431a1f1 | 136 | #else |
| gustavatmel | 1:9c5af431a1f1 | 137 | mbedtls_sha256_free( &ctx->accumulator ); |
| gustavatmel | 1:9c5af431a1f1 | 138 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 139 | #if defined(MBEDTLS_ENTROPY_NV_SEED) |
| gustavatmel | 1:9c5af431a1f1 | 140 | ctx->initial_entropy_run = 0; |
| gustavatmel | 1:9c5af431a1f1 | 141 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 142 | ctx->source_count = 0; |
| gustavatmel | 1:9c5af431a1f1 | 143 | mbedtls_zeroize( ctx->source, sizeof( ctx->source ) ); |
| gustavatmel | 1:9c5af431a1f1 | 144 | ctx->accumulator_started = 0; |
| gustavatmel | 1:9c5af431a1f1 | 145 | } |
| gustavatmel | 1:9c5af431a1f1 | 146 | |
| gustavatmel | 1:9c5af431a1f1 | 147 | int mbedtls_entropy_add_source( mbedtls_entropy_context *ctx, |
| gustavatmel | 1:9c5af431a1f1 | 148 | mbedtls_entropy_f_source_ptr f_source, void *p_source, |
| gustavatmel | 1:9c5af431a1f1 | 149 | size_t threshold, int strong ) |
| gustavatmel | 1:9c5af431a1f1 | 150 | { |
| gustavatmel | 1:9c5af431a1f1 | 151 | int idx, ret = 0; |
| gustavatmel | 1:9c5af431a1f1 | 152 | |
| gustavatmel | 1:9c5af431a1f1 | 153 | #if defined(MBEDTLS_THREADING_C) |
| gustavatmel | 1:9c5af431a1f1 | 154 | if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 155 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 156 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 157 | |
| gustavatmel | 1:9c5af431a1f1 | 158 | idx = ctx->source_count; |
| gustavatmel | 1:9c5af431a1f1 | 159 | if( idx >= MBEDTLS_ENTROPY_MAX_SOURCES ) |
| gustavatmel | 1:9c5af431a1f1 | 160 | { |
| gustavatmel | 1:9c5af431a1f1 | 161 | ret = MBEDTLS_ERR_ENTROPY_MAX_SOURCES; |
| gustavatmel | 1:9c5af431a1f1 | 162 | goto exit; |
| gustavatmel | 1:9c5af431a1f1 | 163 | } |
| gustavatmel | 1:9c5af431a1f1 | 164 | |
| gustavatmel | 1:9c5af431a1f1 | 165 | ctx->source[idx].f_source = f_source; |
| gustavatmel | 1:9c5af431a1f1 | 166 | ctx->source[idx].p_source = p_source; |
| gustavatmel | 1:9c5af431a1f1 | 167 | ctx->source[idx].threshold = threshold; |
| gustavatmel | 1:9c5af431a1f1 | 168 | ctx->source[idx].strong = strong; |
| gustavatmel | 1:9c5af431a1f1 | 169 | |
| gustavatmel | 1:9c5af431a1f1 | 170 | ctx->source_count++; |
| gustavatmel | 1:9c5af431a1f1 | 171 | |
| gustavatmel | 1:9c5af431a1f1 | 172 | exit: |
| gustavatmel | 1:9c5af431a1f1 | 173 | #if defined(MBEDTLS_THREADING_C) |
| gustavatmel | 1:9c5af431a1f1 | 174 | if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 175 | return( MBEDTLS_ERR_THREADING_MUTEX_ERROR ); |
| gustavatmel | 1:9c5af431a1f1 | 176 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 177 | |
| gustavatmel | 1:9c5af431a1f1 | 178 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 179 | } |
| gustavatmel | 1:9c5af431a1f1 | 180 | |
| gustavatmel | 1:9c5af431a1f1 | 181 | /* |
| gustavatmel | 1:9c5af431a1f1 | 182 | * Entropy accumulator update |
| gustavatmel | 1:9c5af431a1f1 | 183 | */ |
| gustavatmel | 1:9c5af431a1f1 | 184 | static int entropy_update( mbedtls_entropy_context *ctx, unsigned char source_id, |
| gustavatmel | 1:9c5af431a1f1 | 185 | const unsigned char *data, size_t len ) |
| gustavatmel | 1:9c5af431a1f1 | 186 | { |
| gustavatmel | 1:9c5af431a1f1 | 187 | unsigned char header[2]; |
| gustavatmel | 1:9c5af431a1f1 | 188 | unsigned char tmp[MBEDTLS_ENTROPY_BLOCK_SIZE]; |
| gustavatmel | 1:9c5af431a1f1 | 189 | size_t use_len = len; |
| gustavatmel | 1:9c5af431a1f1 | 190 | const unsigned char *p = data; |
| gustavatmel | 1:9c5af431a1f1 | 191 | int ret = 0; |
| gustavatmel | 1:9c5af431a1f1 | 192 | |
| gustavatmel | 1:9c5af431a1f1 | 193 | if( use_len > MBEDTLS_ENTROPY_BLOCK_SIZE ) |
| gustavatmel | 1:9c5af431a1f1 | 194 | { |
| gustavatmel | 1:9c5af431a1f1 | 195 | #if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR) |
| gustavatmel | 1:9c5af431a1f1 | 196 | if( ( ret = mbedtls_sha512_ret( data, len, tmp, 0 ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 197 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 198 | #else |
| gustavatmel | 1:9c5af431a1f1 | 199 | if( ( ret = mbedtls_sha256_ret( data, len, tmp, 0 ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 200 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 201 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 202 | p = tmp; |
| gustavatmel | 1:9c5af431a1f1 | 203 | use_len = MBEDTLS_ENTROPY_BLOCK_SIZE; |
| gustavatmel | 1:9c5af431a1f1 | 204 | } |
| gustavatmel | 1:9c5af431a1f1 | 205 | |
| gustavatmel | 1:9c5af431a1f1 | 206 | header[0] = source_id; |
| gustavatmel | 1:9c5af431a1f1 | 207 | header[1] = use_len & 0xFF; |
| gustavatmel | 1:9c5af431a1f1 | 208 | |
| gustavatmel | 1:9c5af431a1f1 | 209 | /* |
| gustavatmel | 1:9c5af431a1f1 | 210 | * Start the accumulator if this has not already happened. Note that |
| gustavatmel | 1:9c5af431a1f1 | 211 | * it is sufficient to start the accumulator here only because all calls to |
| gustavatmel | 1:9c5af431a1f1 | 212 | * gather entropy eventually execute this code. |
| gustavatmel | 1:9c5af431a1f1 | 213 | */ |
| gustavatmel | 1:9c5af431a1f1 | 214 | #if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR) |
| gustavatmel | 1:9c5af431a1f1 | 215 | if( ctx->accumulator_started == 0 && |
| gustavatmel | 1:9c5af431a1f1 | 216 | ( ret = mbedtls_sha512_starts_ret( &ctx->accumulator, 0 ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 217 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 218 | else |
| gustavatmel | 1:9c5af431a1f1 | 219 | ctx->accumulator_started = 1; |
| gustavatmel | 1:9c5af431a1f1 | 220 | if( ( ret = mbedtls_sha512_update_ret( &ctx->accumulator, header, 2 ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 221 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 222 | ret = mbedtls_sha512_update_ret( &ctx->accumulator, p, use_len ); |
| gustavatmel | 1:9c5af431a1f1 | 223 | #else |
| gustavatmel | 1:9c5af431a1f1 | 224 | if( ctx->accumulator_started == 0 && |
| gustavatmel | 1:9c5af431a1f1 | 225 | ( ret = mbedtls_sha256_starts_ret( &ctx->accumulator, 0 ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 226 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 227 | else |
| gustavatmel | 1:9c5af431a1f1 | 228 | ctx->accumulator_started = 1; |
| gustavatmel | 1:9c5af431a1f1 | 229 | if( ( ret = mbedtls_sha256_update_ret( &ctx->accumulator, header, 2 ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 230 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 231 | ret = mbedtls_sha256_update_ret( &ctx->accumulator, p, use_len ); |
| gustavatmel | 1:9c5af431a1f1 | 232 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 233 | |
| gustavatmel | 1:9c5af431a1f1 | 234 | cleanup: |
| gustavatmel | 1:9c5af431a1f1 | 235 | mbedtls_zeroize( tmp, sizeof( tmp ) ); |
| gustavatmel | 1:9c5af431a1f1 | 236 | |
| gustavatmel | 1:9c5af431a1f1 | 237 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 238 | } |
| gustavatmel | 1:9c5af431a1f1 | 239 | |
| gustavatmel | 1:9c5af431a1f1 | 240 | int mbedtls_entropy_update_manual( mbedtls_entropy_context *ctx, |
| gustavatmel | 1:9c5af431a1f1 | 241 | const unsigned char *data, size_t len ) |
| gustavatmel | 1:9c5af431a1f1 | 242 | { |
| gustavatmel | 1:9c5af431a1f1 | 243 | int ret; |
| gustavatmel | 1:9c5af431a1f1 | 244 | |
| gustavatmel | 1:9c5af431a1f1 | 245 | #if defined(MBEDTLS_THREADING_C) |
| gustavatmel | 1:9c5af431a1f1 | 246 | if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 247 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 248 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 249 | |
| gustavatmel | 1:9c5af431a1f1 | 250 | ret = entropy_update( ctx, MBEDTLS_ENTROPY_SOURCE_MANUAL, data, len ); |
| gustavatmel | 1:9c5af431a1f1 | 251 | |
| gustavatmel | 1:9c5af431a1f1 | 252 | #if defined(MBEDTLS_THREADING_C) |
| gustavatmel | 1:9c5af431a1f1 | 253 | if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 254 | return( MBEDTLS_ERR_THREADING_MUTEX_ERROR ); |
| gustavatmel | 1:9c5af431a1f1 | 255 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 256 | |
| gustavatmel | 1:9c5af431a1f1 | 257 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 258 | } |
| gustavatmel | 1:9c5af431a1f1 | 259 | |
| gustavatmel | 1:9c5af431a1f1 | 260 | /* |
| gustavatmel | 1:9c5af431a1f1 | 261 | * Run through the different sources to add entropy to our accumulator |
| gustavatmel | 1:9c5af431a1f1 | 262 | */ |
| gustavatmel | 1:9c5af431a1f1 | 263 | static int entropy_gather_internal( mbedtls_entropy_context *ctx ) |
| gustavatmel | 1:9c5af431a1f1 | 264 | { |
| gustavatmel | 1:9c5af431a1f1 | 265 | int ret, i, have_one_strong = 0; |
| gustavatmel | 1:9c5af431a1f1 | 266 | unsigned char buf[MBEDTLS_ENTROPY_MAX_GATHER]; |
| gustavatmel | 1:9c5af431a1f1 | 267 | size_t olen; |
| gustavatmel | 1:9c5af431a1f1 | 268 | |
| gustavatmel | 1:9c5af431a1f1 | 269 | if( ctx->source_count == 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 270 | return( MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED ); |
| gustavatmel | 1:9c5af431a1f1 | 271 | |
| gustavatmel | 1:9c5af431a1f1 | 272 | /* |
| gustavatmel | 1:9c5af431a1f1 | 273 | * Run through our entropy sources |
| gustavatmel | 1:9c5af431a1f1 | 274 | */ |
| gustavatmel | 1:9c5af431a1f1 | 275 | for( i = 0; i < ctx->source_count; i++ ) |
| gustavatmel | 1:9c5af431a1f1 | 276 | { |
| gustavatmel | 1:9c5af431a1f1 | 277 | if( ctx->source[i].strong == MBEDTLS_ENTROPY_SOURCE_STRONG ) |
| gustavatmel | 1:9c5af431a1f1 | 278 | have_one_strong = 1; |
| gustavatmel | 1:9c5af431a1f1 | 279 | |
| gustavatmel | 1:9c5af431a1f1 | 280 | olen = 0; |
| gustavatmel | 1:9c5af431a1f1 | 281 | if( ( ret = ctx->source[i].f_source( ctx->source[i].p_source, |
| gustavatmel | 1:9c5af431a1f1 | 282 | buf, MBEDTLS_ENTROPY_MAX_GATHER, &olen ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 283 | { |
| gustavatmel | 1:9c5af431a1f1 | 284 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 285 | } |
| gustavatmel | 1:9c5af431a1f1 | 286 | |
| gustavatmel | 1:9c5af431a1f1 | 287 | /* |
| gustavatmel | 1:9c5af431a1f1 | 288 | * Add if we actually gathered something |
| gustavatmel | 1:9c5af431a1f1 | 289 | */ |
| gustavatmel | 1:9c5af431a1f1 | 290 | if( olen > 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 291 | { |
| gustavatmel | 1:9c5af431a1f1 | 292 | if( ( ret = entropy_update( ctx, (unsigned char) i, |
| gustavatmel | 1:9c5af431a1f1 | 293 | buf, olen ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 294 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 295 | ctx->source[i].size += olen; |
| gustavatmel | 1:9c5af431a1f1 | 296 | } |
| gustavatmel | 1:9c5af431a1f1 | 297 | } |
| gustavatmel | 1:9c5af431a1f1 | 298 | |
| gustavatmel | 1:9c5af431a1f1 | 299 | if( have_one_strong == 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 300 | ret = MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE; |
| gustavatmel | 1:9c5af431a1f1 | 301 | |
| gustavatmel | 1:9c5af431a1f1 | 302 | cleanup: |
| gustavatmel | 1:9c5af431a1f1 | 303 | mbedtls_zeroize( buf, sizeof( buf ) ); |
| gustavatmel | 1:9c5af431a1f1 | 304 | |
| gustavatmel | 1:9c5af431a1f1 | 305 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 306 | } |
| gustavatmel | 1:9c5af431a1f1 | 307 | |
| gustavatmel | 1:9c5af431a1f1 | 308 | /* |
| gustavatmel | 1:9c5af431a1f1 | 309 | * Thread-safe wrapper for entropy_gather_internal() |
| gustavatmel | 1:9c5af431a1f1 | 310 | */ |
| gustavatmel | 1:9c5af431a1f1 | 311 | int mbedtls_entropy_gather( mbedtls_entropy_context *ctx ) |
| gustavatmel | 1:9c5af431a1f1 | 312 | { |
| gustavatmel | 1:9c5af431a1f1 | 313 | int ret; |
| gustavatmel | 1:9c5af431a1f1 | 314 | |
| gustavatmel | 1:9c5af431a1f1 | 315 | #if defined(MBEDTLS_THREADING_C) |
| gustavatmel | 1:9c5af431a1f1 | 316 | if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 317 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 318 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 319 | |
| gustavatmel | 1:9c5af431a1f1 | 320 | ret = entropy_gather_internal( ctx ); |
| gustavatmel | 1:9c5af431a1f1 | 321 | |
| gustavatmel | 1:9c5af431a1f1 | 322 | #if defined(MBEDTLS_THREADING_C) |
| gustavatmel | 1:9c5af431a1f1 | 323 | if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 324 | return( MBEDTLS_ERR_THREADING_MUTEX_ERROR ); |
| gustavatmel | 1:9c5af431a1f1 | 325 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 326 | |
| gustavatmel | 1:9c5af431a1f1 | 327 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 328 | } |
| gustavatmel | 1:9c5af431a1f1 | 329 | |
| gustavatmel | 1:9c5af431a1f1 | 330 | int mbedtls_entropy_func( void *data, unsigned char *output, size_t len ) |
| gustavatmel | 1:9c5af431a1f1 | 331 | { |
| gustavatmel | 1:9c5af431a1f1 | 332 | int ret, count = 0, i, done; |
| gustavatmel | 1:9c5af431a1f1 | 333 | mbedtls_entropy_context *ctx = (mbedtls_entropy_context *) data; |
| gustavatmel | 1:9c5af431a1f1 | 334 | unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE]; |
| gustavatmel | 1:9c5af431a1f1 | 335 | |
| gustavatmel | 1:9c5af431a1f1 | 336 | if( len > MBEDTLS_ENTROPY_BLOCK_SIZE ) |
| gustavatmel | 1:9c5af431a1f1 | 337 | return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED ); |
| gustavatmel | 1:9c5af431a1f1 | 338 | |
| gustavatmel | 1:9c5af431a1f1 | 339 | #if defined(MBEDTLS_ENTROPY_NV_SEED) |
| gustavatmel | 1:9c5af431a1f1 | 340 | /* Update the NV entropy seed before generating any entropy for outside |
| gustavatmel | 1:9c5af431a1f1 | 341 | * use. |
| gustavatmel | 1:9c5af431a1f1 | 342 | */ |
| gustavatmel | 1:9c5af431a1f1 | 343 | if( ctx->initial_entropy_run == 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 344 | { |
| gustavatmel | 1:9c5af431a1f1 | 345 | ctx->initial_entropy_run = 1; |
| gustavatmel | 1:9c5af431a1f1 | 346 | if( ( ret = mbedtls_entropy_update_nv_seed( ctx ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 347 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 348 | } |
| gustavatmel | 1:9c5af431a1f1 | 349 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 350 | |
| gustavatmel | 1:9c5af431a1f1 | 351 | #if defined(MBEDTLS_THREADING_C) |
| gustavatmel | 1:9c5af431a1f1 | 352 | if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 353 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 354 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 355 | |
| gustavatmel | 1:9c5af431a1f1 | 356 | /* |
| gustavatmel | 1:9c5af431a1f1 | 357 | * Always gather extra entropy before a call |
| gustavatmel | 1:9c5af431a1f1 | 358 | */ |
| gustavatmel | 1:9c5af431a1f1 | 359 | do |
| gustavatmel | 1:9c5af431a1f1 | 360 | { |
| gustavatmel | 1:9c5af431a1f1 | 361 | if( count++ > ENTROPY_MAX_LOOP ) |
| gustavatmel | 1:9c5af431a1f1 | 362 | { |
| gustavatmel | 1:9c5af431a1f1 | 363 | ret = MBEDTLS_ERR_ENTROPY_SOURCE_FAILED; |
| gustavatmel | 1:9c5af431a1f1 | 364 | goto exit; |
| gustavatmel | 1:9c5af431a1f1 | 365 | } |
| gustavatmel | 1:9c5af431a1f1 | 366 | |
| gustavatmel | 1:9c5af431a1f1 | 367 | if( ( ret = entropy_gather_internal( ctx ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 368 | goto exit; |
| gustavatmel | 1:9c5af431a1f1 | 369 | |
| gustavatmel | 1:9c5af431a1f1 | 370 | done = 1; |
| gustavatmel | 1:9c5af431a1f1 | 371 | for( i = 0; i < ctx->source_count; i++ ) |
| gustavatmel | 1:9c5af431a1f1 | 372 | if( ctx->source[i].size < ctx->source[i].threshold ) |
| gustavatmel | 1:9c5af431a1f1 | 373 | done = 0; |
| gustavatmel | 1:9c5af431a1f1 | 374 | } |
| gustavatmel | 1:9c5af431a1f1 | 375 | while( ! done ); |
| gustavatmel | 1:9c5af431a1f1 | 376 | |
| gustavatmel | 1:9c5af431a1f1 | 377 | memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE ); |
| gustavatmel | 1:9c5af431a1f1 | 378 | |
| gustavatmel | 1:9c5af431a1f1 | 379 | #if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR) |
| gustavatmel | 1:9c5af431a1f1 | 380 | /* |
| gustavatmel | 1:9c5af431a1f1 | 381 | * Note that at this stage it is assumed that the accumulator was started |
| gustavatmel | 1:9c5af431a1f1 | 382 | * in a previous call to entropy_update(). If this is not guaranteed, the |
| gustavatmel | 1:9c5af431a1f1 | 383 | * code below will fail. |
| gustavatmel | 1:9c5af431a1f1 | 384 | */ |
| gustavatmel | 1:9c5af431a1f1 | 385 | if( ( ret = mbedtls_sha512_finish_ret( &ctx->accumulator, buf ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 386 | goto exit; |
| gustavatmel | 1:9c5af431a1f1 | 387 | |
| gustavatmel | 1:9c5af431a1f1 | 388 | /* |
| gustavatmel | 1:9c5af431a1f1 | 389 | * Reset accumulator and counters and recycle existing entropy |
| gustavatmel | 1:9c5af431a1f1 | 390 | */ |
| gustavatmel | 1:9c5af431a1f1 | 391 | mbedtls_sha512_free( &ctx->accumulator ); |
| gustavatmel | 1:9c5af431a1f1 | 392 | mbedtls_sha512_init( &ctx->accumulator ); |
| gustavatmel | 1:9c5af431a1f1 | 393 | if( ( ret = mbedtls_sha512_starts_ret( &ctx->accumulator, 0 ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 394 | goto exit; |
| gustavatmel | 1:9c5af431a1f1 | 395 | if( ( ret = mbedtls_sha512_update_ret( &ctx->accumulator, buf, |
| gustavatmel | 1:9c5af431a1f1 | 396 | MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 397 | goto exit; |
| gustavatmel | 1:9c5af431a1f1 | 398 | |
| gustavatmel | 1:9c5af431a1f1 | 399 | /* |
| gustavatmel | 1:9c5af431a1f1 | 400 | * Perform second SHA-512 on entropy |
| gustavatmel | 1:9c5af431a1f1 | 401 | */ |
| gustavatmel | 1:9c5af431a1f1 | 402 | if( ( ret = mbedtls_sha512_ret( buf, MBEDTLS_ENTROPY_BLOCK_SIZE, |
| gustavatmel | 1:9c5af431a1f1 | 403 | buf, 0 ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 404 | goto exit; |
| gustavatmel | 1:9c5af431a1f1 | 405 | #else /* MBEDTLS_ENTROPY_SHA512_ACCUMULATOR */ |
| gustavatmel | 1:9c5af431a1f1 | 406 | if( ( ret = mbedtls_sha256_finish_ret( &ctx->accumulator, buf ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 407 | goto exit; |
| gustavatmel | 1:9c5af431a1f1 | 408 | |
| gustavatmel | 1:9c5af431a1f1 | 409 | /* |
| gustavatmel | 1:9c5af431a1f1 | 410 | * Reset accumulator and counters and recycle existing entropy |
| gustavatmel | 1:9c5af431a1f1 | 411 | */ |
| gustavatmel | 1:9c5af431a1f1 | 412 | mbedtls_sha256_free( &ctx->accumulator ); |
| gustavatmel | 1:9c5af431a1f1 | 413 | mbedtls_sha256_init( &ctx->accumulator ); |
| gustavatmel | 1:9c5af431a1f1 | 414 | if( ( ret = mbedtls_sha256_starts_ret( &ctx->accumulator, 0 ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 415 | goto exit; |
| gustavatmel | 1:9c5af431a1f1 | 416 | if( ( ret = mbedtls_sha256_update_ret( &ctx->accumulator, buf, |
| gustavatmel | 1:9c5af431a1f1 | 417 | MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 418 | goto exit; |
| gustavatmel | 1:9c5af431a1f1 | 419 | |
| gustavatmel | 1:9c5af431a1f1 | 420 | /* |
| gustavatmel | 1:9c5af431a1f1 | 421 | * Perform second SHA-256 on entropy |
| gustavatmel | 1:9c5af431a1f1 | 422 | */ |
| gustavatmel | 1:9c5af431a1f1 | 423 | if( ( ret = mbedtls_sha256_ret( buf, MBEDTLS_ENTROPY_BLOCK_SIZE, |
| gustavatmel | 1:9c5af431a1f1 | 424 | buf, 0 ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 425 | goto exit; |
| gustavatmel | 1:9c5af431a1f1 | 426 | #endif /* MBEDTLS_ENTROPY_SHA512_ACCUMULATOR */ |
| gustavatmel | 1:9c5af431a1f1 | 427 | |
| gustavatmel | 1:9c5af431a1f1 | 428 | for( i = 0; i < ctx->source_count; i++ ) |
| gustavatmel | 1:9c5af431a1f1 | 429 | ctx->source[i].size = 0; |
| gustavatmel | 1:9c5af431a1f1 | 430 | |
| gustavatmel | 1:9c5af431a1f1 | 431 | memcpy( output, buf, len ); |
| gustavatmel | 1:9c5af431a1f1 | 432 | |
| gustavatmel | 1:9c5af431a1f1 | 433 | ret = 0; |
| gustavatmel | 1:9c5af431a1f1 | 434 | |
| gustavatmel | 1:9c5af431a1f1 | 435 | exit: |
| gustavatmel | 1:9c5af431a1f1 | 436 | mbedtls_zeroize( buf, sizeof( buf ) ); |
| gustavatmel | 1:9c5af431a1f1 | 437 | |
| gustavatmel | 1:9c5af431a1f1 | 438 | #if defined(MBEDTLS_THREADING_C) |
| gustavatmel | 1:9c5af431a1f1 | 439 | if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 440 | return( MBEDTLS_ERR_THREADING_MUTEX_ERROR ); |
| gustavatmel | 1:9c5af431a1f1 | 441 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 442 | |
| gustavatmel | 1:9c5af431a1f1 | 443 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 444 | } |
| gustavatmel | 1:9c5af431a1f1 | 445 | |
| gustavatmel | 1:9c5af431a1f1 | 446 | #if defined(MBEDTLS_ENTROPY_NV_SEED) |
| gustavatmel | 1:9c5af431a1f1 | 447 | int mbedtls_entropy_update_nv_seed( mbedtls_entropy_context *ctx ) |
| gustavatmel | 1:9c5af431a1f1 | 448 | { |
| gustavatmel | 1:9c5af431a1f1 | 449 | int ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR; |
| gustavatmel | 1:9c5af431a1f1 | 450 | unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE]; |
| gustavatmel | 1:9c5af431a1f1 | 451 | |
| gustavatmel | 1:9c5af431a1f1 | 452 | /* Read new seed and write it to NV */ |
| gustavatmel | 1:9c5af431a1f1 | 453 | if( ( ret = mbedtls_entropy_func( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 454 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 455 | |
| gustavatmel | 1:9c5af431a1f1 | 456 | if( mbedtls_nv_seed_write( buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) < 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 457 | return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR ); |
| gustavatmel | 1:9c5af431a1f1 | 458 | |
| gustavatmel | 1:9c5af431a1f1 | 459 | /* Manually update the remaining stream with a separator value to diverge */ |
| gustavatmel | 1:9c5af431a1f1 | 460 | memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE ); |
| gustavatmel | 1:9c5af431a1f1 | 461 | ret = mbedtls_entropy_update_manual( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE ); |
| gustavatmel | 1:9c5af431a1f1 | 462 | |
| gustavatmel | 1:9c5af431a1f1 | 463 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 464 | } |
| gustavatmel | 1:9c5af431a1f1 | 465 | #endif /* MBEDTLS_ENTROPY_NV_SEED */ |
| gustavatmel | 1:9c5af431a1f1 | 466 | |
| gustavatmel | 1:9c5af431a1f1 | 467 | #if defined(MBEDTLS_FS_IO) |
| gustavatmel | 1:9c5af431a1f1 | 468 | int mbedtls_entropy_write_seed_file( mbedtls_entropy_context *ctx, const char *path ) |
| gustavatmel | 1:9c5af431a1f1 | 469 | { |
| gustavatmel | 1:9c5af431a1f1 | 470 | int ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR; |
| gustavatmel | 1:9c5af431a1f1 | 471 | FILE *f; |
| gustavatmel | 1:9c5af431a1f1 | 472 | unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE]; |
| gustavatmel | 1:9c5af431a1f1 | 473 | |
| gustavatmel | 1:9c5af431a1f1 | 474 | if( ( f = fopen( path, "wb" ) ) == NULL ) |
| gustavatmel | 1:9c5af431a1f1 | 475 | return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR ); |
| gustavatmel | 1:9c5af431a1f1 | 476 | |
| gustavatmel | 1:9c5af431a1f1 | 477 | if( ( ret = mbedtls_entropy_func( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 478 | goto exit; |
| gustavatmel | 1:9c5af431a1f1 | 479 | |
| gustavatmel | 1:9c5af431a1f1 | 480 | if( fwrite( buf, 1, MBEDTLS_ENTROPY_BLOCK_SIZE, f ) != MBEDTLS_ENTROPY_BLOCK_SIZE ) |
| gustavatmel | 1:9c5af431a1f1 | 481 | { |
| gustavatmel | 1:9c5af431a1f1 | 482 | ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR; |
| gustavatmel | 1:9c5af431a1f1 | 483 | goto exit; |
| gustavatmel | 1:9c5af431a1f1 | 484 | } |
| gustavatmel | 1:9c5af431a1f1 | 485 | |
| gustavatmel | 1:9c5af431a1f1 | 486 | ret = 0; |
| gustavatmel | 1:9c5af431a1f1 | 487 | |
| gustavatmel | 1:9c5af431a1f1 | 488 | exit: |
| gustavatmel | 1:9c5af431a1f1 | 489 | mbedtls_zeroize( buf, sizeof( buf ) ); |
| gustavatmel | 1:9c5af431a1f1 | 490 | |
| gustavatmel | 1:9c5af431a1f1 | 491 | fclose( f ); |
| gustavatmel | 1:9c5af431a1f1 | 492 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 493 | } |
| gustavatmel | 1:9c5af431a1f1 | 494 | |
| gustavatmel | 1:9c5af431a1f1 | 495 | int mbedtls_entropy_update_seed_file( mbedtls_entropy_context *ctx, const char *path ) |
| gustavatmel | 1:9c5af431a1f1 | 496 | { |
| gustavatmel | 1:9c5af431a1f1 | 497 | int ret = 0; |
| gustavatmel | 1:9c5af431a1f1 | 498 | FILE *f; |
| gustavatmel | 1:9c5af431a1f1 | 499 | size_t n; |
| gustavatmel | 1:9c5af431a1f1 | 500 | unsigned char buf[ MBEDTLS_ENTROPY_MAX_SEED_SIZE ]; |
| gustavatmel | 1:9c5af431a1f1 | 501 | |
| gustavatmel | 1:9c5af431a1f1 | 502 | if( ( f = fopen( path, "rb" ) ) == NULL ) |
| gustavatmel | 1:9c5af431a1f1 | 503 | return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR ); |
| gustavatmel | 1:9c5af431a1f1 | 504 | |
| gustavatmel | 1:9c5af431a1f1 | 505 | fseek( f, 0, SEEK_END ); |
| gustavatmel | 1:9c5af431a1f1 | 506 | n = (size_t) ftell( f ); |
| gustavatmel | 1:9c5af431a1f1 | 507 | fseek( f, 0, SEEK_SET ); |
| gustavatmel | 1:9c5af431a1f1 | 508 | |
| gustavatmel | 1:9c5af431a1f1 | 509 | if( n > MBEDTLS_ENTROPY_MAX_SEED_SIZE ) |
| gustavatmel | 1:9c5af431a1f1 | 510 | n = MBEDTLS_ENTROPY_MAX_SEED_SIZE; |
| gustavatmel | 1:9c5af431a1f1 | 511 | |
| gustavatmel | 1:9c5af431a1f1 | 512 | if( fread( buf, 1, n, f ) != n ) |
| gustavatmel | 1:9c5af431a1f1 | 513 | ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR; |
| gustavatmel | 1:9c5af431a1f1 | 514 | else |
| gustavatmel | 1:9c5af431a1f1 | 515 | ret = mbedtls_entropy_update_manual( ctx, buf, n ); |
| gustavatmel | 1:9c5af431a1f1 | 516 | |
| gustavatmel | 1:9c5af431a1f1 | 517 | fclose( f ); |
| gustavatmel | 1:9c5af431a1f1 | 518 | |
| gustavatmel | 1:9c5af431a1f1 | 519 | mbedtls_zeroize( buf, sizeof( buf ) ); |
| gustavatmel | 1:9c5af431a1f1 | 520 | |
| gustavatmel | 1:9c5af431a1f1 | 521 | if( ret != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 522 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 523 | |
| gustavatmel | 1:9c5af431a1f1 | 524 | return( mbedtls_entropy_write_seed_file( ctx, path ) ); |
| gustavatmel | 1:9c5af431a1f1 | 525 | } |
| gustavatmel | 1:9c5af431a1f1 | 526 | #endif /* MBEDTLS_FS_IO */ |
| gustavatmel | 1:9c5af431a1f1 | 527 | |
| gustavatmel | 1:9c5af431a1f1 | 528 | #if defined(MBEDTLS_SELF_TEST) |
| gustavatmel | 1:9c5af431a1f1 | 529 | #if !defined(MBEDTLS_TEST_NULL_ENTROPY) |
| gustavatmel | 1:9c5af431a1f1 | 530 | /* |
| gustavatmel | 1:9c5af431a1f1 | 531 | * Dummy source function |
| gustavatmel | 1:9c5af431a1f1 | 532 | */ |
| gustavatmel | 1:9c5af431a1f1 | 533 | static int entropy_dummy_source( void *data, unsigned char *output, |
| gustavatmel | 1:9c5af431a1f1 | 534 | size_t len, size_t *olen ) |
| gustavatmel | 1:9c5af431a1f1 | 535 | { |
| gustavatmel | 1:9c5af431a1f1 | 536 | ((void) data); |
| gustavatmel | 1:9c5af431a1f1 | 537 | |
| gustavatmel | 1:9c5af431a1f1 | 538 | memset( output, 0x2a, len ); |
| gustavatmel | 1:9c5af431a1f1 | 539 | *olen = len; |
| gustavatmel | 1:9c5af431a1f1 | 540 | |
| gustavatmel | 1:9c5af431a1f1 | 541 | return( 0 ); |
| gustavatmel | 1:9c5af431a1f1 | 542 | } |
| gustavatmel | 1:9c5af431a1f1 | 543 | #endif /* !MBEDTLS_TEST_NULL_ENTROPY */ |
| gustavatmel | 1:9c5af431a1f1 | 544 | |
| gustavatmel | 1:9c5af431a1f1 | 545 | #if defined(MBEDTLS_ENTROPY_HARDWARE_ALT) |
| gustavatmel | 1:9c5af431a1f1 | 546 | |
| gustavatmel | 1:9c5af431a1f1 | 547 | static int mbedtls_entropy_source_self_test_gather( unsigned char *buf, size_t buf_len ) |
| gustavatmel | 1:9c5af431a1f1 | 548 | { |
| gustavatmel | 1:9c5af431a1f1 | 549 | int ret = 0; |
| gustavatmel | 1:9c5af431a1f1 | 550 | size_t entropy_len = 0; |
| gustavatmel | 1:9c5af431a1f1 | 551 | size_t olen = 0; |
| gustavatmel | 1:9c5af431a1f1 | 552 | size_t attempts = buf_len; |
| gustavatmel | 1:9c5af431a1f1 | 553 | |
| gustavatmel | 1:9c5af431a1f1 | 554 | while( attempts > 0 && entropy_len < buf_len ) |
| gustavatmel | 1:9c5af431a1f1 | 555 | { |
| gustavatmel | 1:9c5af431a1f1 | 556 | if( ( ret = mbedtls_hardware_poll( NULL, buf + entropy_len, |
| gustavatmel | 1:9c5af431a1f1 | 557 | buf_len - entropy_len, &olen ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 558 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 559 | |
| gustavatmel | 1:9c5af431a1f1 | 560 | entropy_len += olen; |
| gustavatmel | 1:9c5af431a1f1 | 561 | attempts--; |
| gustavatmel | 1:9c5af431a1f1 | 562 | } |
| gustavatmel | 1:9c5af431a1f1 | 563 | |
| gustavatmel | 1:9c5af431a1f1 | 564 | if( entropy_len < buf_len ) |
| gustavatmel | 1:9c5af431a1f1 | 565 | { |
| gustavatmel | 1:9c5af431a1f1 | 566 | ret = 1; |
| gustavatmel | 1:9c5af431a1f1 | 567 | } |
| gustavatmel | 1:9c5af431a1f1 | 568 | |
| gustavatmel | 1:9c5af431a1f1 | 569 | return( ret ); |
| gustavatmel | 1:9c5af431a1f1 | 570 | } |
| gustavatmel | 1:9c5af431a1f1 | 571 | |
| gustavatmel | 1:9c5af431a1f1 | 572 | |
| gustavatmel | 1:9c5af431a1f1 | 573 | static int mbedtls_entropy_source_self_test_check_bits( const unsigned char *buf, |
| gustavatmel | 1:9c5af431a1f1 | 574 | size_t buf_len ) |
| gustavatmel | 1:9c5af431a1f1 | 575 | { |
| gustavatmel | 1:9c5af431a1f1 | 576 | unsigned char set= 0xFF; |
| gustavatmel | 1:9c5af431a1f1 | 577 | unsigned char unset = 0x00; |
| gustavatmel | 1:9c5af431a1f1 | 578 | size_t i; |
| gustavatmel | 1:9c5af431a1f1 | 579 | |
| gustavatmel | 1:9c5af431a1f1 | 580 | for( i = 0; i < buf_len; i++ ) |
| gustavatmel | 1:9c5af431a1f1 | 581 | { |
| gustavatmel | 1:9c5af431a1f1 | 582 | set &= buf[i]; |
| gustavatmel | 1:9c5af431a1f1 | 583 | unset |= buf[i]; |
| gustavatmel | 1:9c5af431a1f1 | 584 | } |
| gustavatmel | 1:9c5af431a1f1 | 585 | |
| gustavatmel | 1:9c5af431a1f1 | 586 | return( set == 0xFF || unset == 0x00 ); |
| gustavatmel | 1:9c5af431a1f1 | 587 | } |
| gustavatmel | 1:9c5af431a1f1 | 588 | |
| gustavatmel | 1:9c5af431a1f1 | 589 | /* |
| gustavatmel | 1:9c5af431a1f1 | 590 | * A test to ensure hat the entropy sources are functioning correctly |
| gustavatmel | 1:9c5af431a1f1 | 591 | * and there is no obvious failure. The test performs the following checks: |
| gustavatmel | 1:9c5af431a1f1 | 592 | * - The entropy source is not providing only 0s (all bits unset) or 1s (all |
| gustavatmel | 1:9c5af431a1f1 | 593 | * bits set). |
| gustavatmel | 1:9c5af431a1f1 | 594 | * - The entropy source is not providing values in a pattern. Because the |
| gustavatmel | 1:9c5af431a1f1 | 595 | * hardware could be providing data in an arbitrary length, this check polls |
| gustavatmel | 1:9c5af431a1f1 | 596 | * the hardware entropy source twice and compares the result to ensure they |
| gustavatmel | 1:9c5af431a1f1 | 597 | * are not equal. |
| gustavatmel | 1:9c5af431a1f1 | 598 | * - The error code returned by the entropy source is not an error. |
| gustavatmel | 1:9c5af431a1f1 | 599 | */ |
| gustavatmel | 1:9c5af431a1f1 | 600 | int mbedtls_entropy_source_self_test( int verbose ) |
| gustavatmel | 1:9c5af431a1f1 | 601 | { |
| gustavatmel | 1:9c5af431a1f1 | 602 | int ret = 0; |
| gustavatmel | 1:9c5af431a1f1 | 603 | unsigned char buf0[2 * sizeof( unsigned long long int )]; |
| gustavatmel | 1:9c5af431a1f1 | 604 | unsigned char buf1[2 * sizeof( unsigned long long int )]; |
| gustavatmel | 1:9c5af431a1f1 | 605 | |
| gustavatmel | 1:9c5af431a1f1 | 606 | if( verbose != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 607 | mbedtls_printf( " ENTROPY_BIAS test: " ); |
| gustavatmel | 1:9c5af431a1f1 | 608 | |
| gustavatmel | 1:9c5af431a1f1 | 609 | memset( buf0, 0x00, sizeof( buf0 ) ); |
| gustavatmel | 1:9c5af431a1f1 | 610 | memset( buf1, 0x00, sizeof( buf1 ) ); |
| gustavatmel | 1:9c5af431a1f1 | 611 | |
| gustavatmel | 1:9c5af431a1f1 | 612 | if( ( ret = mbedtls_entropy_source_self_test_gather( buf0, sizeof( buf0 ) ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 613 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 614 | if( ( ret = mbedtls_entropy_source_self_test_gather( buf1, sizeof( buf1 ) ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 615 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 616 | |
| gustavatmel | 1:9c5af431a1f1 | 617 | /* Make sure that the returned values are not all 0 or 1 */ |
| gustavatmel | 1:9c5af431a1f1 | 618 | if( ( ret = mbedtls_entropy_source_self_test_check_bits( buf0, sizeof( buf0 ) ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 619 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 620 | if( ( ret = mbedtls_entropy_source_self_test_check_bits( buf1, sizeof( buf1 ) ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 621 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 622 | |
| gustavatmel | 1:9c5af431a1f1 | 623 | /* Make sure that the entropy source is not returning values in a |
| gustavatmel | 1:9c5af431a1f1 | 624 | * pattern */ |
| gustavatmel | 1:9c5af431a1f1 | 625 | ret = memcmp( buf0, buf1, sizeof( buf0 ) ) == 0; |
| gustavatmel | 1:9c5af431a1f1 | 626 | |
| gustavatmel | 1:9c5af431a1f1 | 627 | cleanup: |
| gustavatmel | 1:9c5af431a1f1 | 628 | if( verbose != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 629 | { |
| gustavatmel | 1:9c5af431a1f1 | 630 | if( ret != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 631 | mbedtls_printf( "failed\n" ); |
| gustavatmel | 1:9c5af431a1f1 | 632 | else |
| gustavatmel | 1:9c5af431a1f1 | 633 | mbedtls_printf( "passed\n" ); |
| gustavatmel | 1:9c5af431a1f1 | 634 | |
| gustavatmel | 1:9c5af431a1f1 | 635 | mbedtls_printf( "\n" ); |
| gustavatmel | 1:9c5af431a1f1 | 636 | } |
| gustavatmel | 1:9c5af431a1f1 | 637 | |
| gustavatmel | 1:9c5af431a1f1 | 638 | return( ret != 0 ); |
| gustavatmel | 1:9c5af431a1f1 | 639 | } |
| gustavatmel | 1:9c5af431a1f1 | 640 | |
| gustavatmel | 1:9c5af431a1f1 | 641 | #endif /* MBEDTLS_ENTROPY_HARDWARE_ALT */ |
| gustavatmel | 1:9c5af431a1f1 | 642 | |
| gustavatmel | 1:9c5af431a1f1 | 643 | /* |
| gustavatmel | 1:9c5af431a1f1 | 644 | * The actual entropy quality is hard to test, but we can at least |
| gustavatmel | 1:9c5af431a1f1 | 645 | * test that the functions don't cause errors and write the correct |
| gustavatmel | 1:9c5af431a1f1 | 646 | * amount of data to buffers. |
| gustavatmel | 1:9c5af431a1f1 | 647 | */ |
| gustavatmel | 1:9c5af431a1f1 | 648 | int mbedtls_entropy_self_test( int verbose ) |
| gustavatmel | 1:9c5af431a1f1 | 649 | { |
| gustavatmel | 1:9c5af431a1f1 | 650 | int ret = 1; |
| gustavatmel | 1:9c5af431a1f1 | 651 | #if !defined(MBEDTLS_TEST_NULL_ENTROPY) |
| gustavatmel | 1:9c5af431a1f1 | 652 | mbedtls_entropy_context ctx; |
| gustavatmel | 1:9c5af431a1f1 | 653 | unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 }; |
| gustavatmel | 1:9c5af431a1f1 | 654 | unsigned char acc[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 }; |
| gustavatmel | 1:9c5af431a1f1 | 655 | size_t i, j; |
| gustavatmel | 1:9c5af431a1f1 | 656 | #endif /* !MBEDTLS_TEST_NULL_ENTROPY */ |
| gustavatmel | 1:9c5af431a1f1 | 657 | |
| gustavatmel | 1:9c5af431a1f1 | 658 | if( verbose != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 659 | mbedtls_printf( " ENTROPY test: " ); |
| gustavatmel | 1:9c5af431a1f1 | 660 | |
| gustavatmel | 1:9c5af431a1f1 | 661 | #if !defined(MBEDTLS_TEST_NULL_ENTROPY) |
| gustavatmel | 1:9c5af431a1f1 | 662 | mbedtls_entropy_init( &ctx ); |
| gustavatmel | 1:9c5af431a1f1 | 663 | |
| gustavatmel | 1:9c5af431a1f1 | 664 | /* First do a gather to make sure we have default sources */ |
| gustavatmel | 1:9c5af431a1f1 | 665 | if( ( ret = mbedtls_entropy_gather( &ctx ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 666 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 667 | |
| gustavatmel | 1:9c5af431a1f1 | 668 | ret = mbedtls_entropy_add_source( &ctx, entropy_dummy_source, NULL, 16, |
| gustavatmel | 1:9c5af431a1f1 | 669 | MBEDTLS_ENTROPY_SOURCE_WEAK ); |
| gustavatmel | 1:9c5af431a1f1 | 670 | if( ret != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 671 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 672 | |
| gustavatmel | 1:9c5af431a1f1 | 673 | if( ( ret = mbedtls_entropy_update_manual( &ctx, buf, sizeof buf ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 674 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 675 | |
| gustavatmel | 1:9c5af431a1f1 | 676 | /* |
| gustavatmel | 1:9c5af431a1f1 | 677 | * To test that mbedtls_entropy_func writes correct number of bytes: |
| gustavatmel | 1:9c5af431a1f1 | 678 | * - use the whole buffer and rely on ASan to detect overruns |
| gustavatmel | 1:9c5af431a1f1 | 679 | * - collect entropy 8 times and OR the result in an accumulator: |
| gustavatmel | 1:9c5af431a1f1 | 680 | * any byte should then be 0 with probably 2^(-64), so requiring |
| gustavatmel | 1:9c5af431a1f1 | 681 | * each of the 32 or 64 bytes to be non-zero has a false failure rate |
| gustavatmel | 1:9c5af431a1f1 | 682 | * of at most 2^(-58) which is acceptable. |
| gustavatmel | 1:9c5af431a1f1 | 683 | */ |
| gustavatmel | 1:9c5af431a1f1 | 684 | for( i = 0; i < 8; i++ ) |
| gustavatmel | 1:9c5af431a1f1 | 685 | { |
| gustavatmel | 1:9c5af431a1f1 | 686 | if( ( ret = mbedtls_entropy_func( &ctx, buf, sizeof( buf ) ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 687 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 688 | |
| gustavatmel | 1:9c5af431a1f1 | 689 | for( j = 0; j < sizeof( buf ); j++ ) |
| gustavatmel | 1:9c5af431a1f1 | 690 | acc[j] |= buf[j]; |
| gustavatmel | 1:9c5af431a1f1 | 691 | } |
| gustavatmel | 1:9c5af431a1f1 | 692 | |
| gustavatmel | 1:9c5af431a1f1 | 693 | for( j = 0; j < sizeof( buf ); j++ ) |
| gustavatmel | 1:9c5af431a1f1 | 694 | { |
| gustavatmel | 1:9c5af431a1f1 | 695 | if( acc[j] == 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 696 | { |
| gustavatmel | 1:9c5af431a1f1 | 697 | ret = 1; |
| gustavatmel | 1:9c5af431a1f1 | 698 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 699 | } |
| gustavatmel | 1:9c5af431a1f1 | 700 | } |
| gustavatmel | 1:9c5af431a1f1 | 701 | |
| gustavatmel | 1:9c5af431a1f1 | 702 | #if defined(MBEDTLS_ENTROPY_HARDWARE_ALT) |
| gustavatmel | 1:9c5af431a1f1 | 703 | if( ( ret = mbedtls_entropy_source_self_test( 0 ) ) != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 704 | goto cleanup; |
| gustavatmel | 1:9c5af431a1f1 | 705 | #endif |
| gustavatmel | 1:9c5af431a1f1 | 706 | |
| gustavatmel | 1:9c5af431a1f1 | 707 | cleanup: |
| gustavatmel | 1:9c5af431a1f1 | 708 | mbedtls_entropy_free( &ctx ); |
| gustavatmel | 1:9c5af431a1f1 | 709 | #endif /* !MBEDTLS_TEST_NULL_ENTROPY */ |
| gustavatmel | 1:9c5af431a1f1 | 710 | |
| gustavatmel | 1:9c5af431a1f1 | 711 | if( verbose != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 712 | { |
| gustavatmel | 1:9c5af431a1f1 | 713 | if( ret != 0 ) |
| gustavatmel | 1:9c5af431a1f1 | 714 | mbedtls_printf( "failed\n" ); |
| gustavatmel | 1:9c5af431a1f1 | 715 | else |
| gustavatmel | 1:9c5af431a1f1 | 716 | mbedtls_printf( "passed\n" ); |
| gustavatmel | 1:9c5af431a1f1 | 717 | |
| gustavatmel | 1:9c5af431a1f1 | 718 | mbedtls_printf( "\n" ); |
| gustavatmel | 1:9c5af431a1f1 | 719 | } |
| gustavatmel | 1:9c5af431a1f1 | 720 | |
| gustavatmel | 1:9c5af431a1f1 | 721 | return( ret != 0 ); |
| gustavatmel | 1:9c5af431a1f1 | 722 | } |
| gustavatmel | 1:9c5af431a1f1 | 723 | #endif /* MBEDTLS_SELF_TEST */ |
| gustavatmel | 1:9c5af431a1f1 | 724 | |
| gustavatmel | 1:9c5af431a1f1 | 725 | #endif /* MBEDTLS_ENTROPY_C */ |