blob: 23de4062a470c7761388b744b03c716b1b076350 [file] [log] [blame]
Jens Wiklander817466c2018-05-22 13:49:31 +02001/*
2 * Entropy accumulator implementation
3 *
4 * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21
22#if !defined(MBEDTLS_CONFIG_FILE)
23#include "mbedtls/config.h"
24#else
25#include MBEDTLS_CONFIG_FILE
26#endif
27
28#if defined(MBEDTLS_ENTROPY_C)
29
30#if defined(MBEDTLS_TEST_NULL_ENTROPY)
31#warning "**** WARNING! MBEDTLS_TEST_NULL_ENTROPY defined! "
32#warning "**** THIS BUILD HAS NO DEFINED ENTROPY SOURCES "
33#warning "**** THIS BUILD IS *NOT* SUITABLE FOR PRODUCTION USE "
34#endif
35
36#include "mbedtls/entropy.h"
37#include "mbedtls/entropy_poll.h"
38
39#include <string.h>
40
41#if defined(MBEDTLS_FS_IO)
42#include <stdio.h>
43#endif
44
45#if defined(MBEDTLS_ENTROPY_NV_SEED)
46#include "mbedtls/platform.h"
47#endif
48
49#if defined(MBEDTLS_SELF_TEST)
50#if defined(MBEDTLS_PLATFORM_C)
51#include "mbedtls/platform.h"
52#else
53#include <stdio.h>
54#define mbedtls_printf printf
55#endif /* MBEDTLS_PLATFORM_C */
56#endif /* MBEDTLS_SELF_TEST */
57
58#if defined(MBEDTLS_HAVEGE_C)
59#include "mbedtls/havege.h"
60#endif
61
62/* Implementation that should never be optimized out by the compiler */
63static void mbedtls_zeroize( void *v, size_t n ) {
64 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
65}
66
67#define ENTROPY_MAX_LOOP 256 /**< Maximum amount to loop before error */
68
69void mbedtls_entropy_init( mbedtls_entropy_context *ctx )
70{
71 memset( ctx, 0, sizeof(mbedtls_entropy_context) );
72
73#if defined(MBEDTLS_THREADING_C)
74 mbedtls_mutex_init( &ctx->mutex );
75#endif
76
77#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
78 mbedtls_sha512_starts( &ctx->accumulator, 0 );
79#else
80 mbedtls_sha256_starts( &ctx->accumulator, 0 );
81#endif
82#if defined(MBEDTLS_HAVEGE_C)
83 mbedtls_havege_init( &ctx->havege_data );
84#endif
85
86#if defined(MBEDTLS_TEST_NULL_ENTROPY)
87 mbedtls_entropy_add_source( ctx, mbedtls_null_entropy_poll, NULL,
88 1, MBEDTLS_ENTROPY_SOURCE_STRONG );
89#endif
90
91#if !defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES)
92#if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
93 mbedtls_entropy_add_source( ctx, mbedtls_platform_entropy_poll, NULL,
94 MBEDTLS_ENTROPY_MIN_PLATFORM,
95 MBEDTLS_ENTROPY_SOURCE_STRONG );
96#endif
97#if defined(MBEDTLS_TIMING_C)
98 mbedtls_entropy_add_source( ctx, mbedtls_hardclock_poll, NULL,
99 MBEDTLS_ENTROPY_MIN_HARDCLOCK,
100 MBEDTLS_ENTROPY_SOURCE_WEAK );
101#endif
102#if defined(MBEDTLS_HAVEGE_C)
103 mbedtls_entropy_add_source( ctx, mbedtls_havege_poll, &ctx->havege_data,
104 MBEDTLS_ENTROPY_MIN_HAVEGE,
105 MBEDTLS_ENTROPY_SOURCE_STRONG );
106#endif
107#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
108 mbedtls_entropy_add_source( ctx, mbedtls_hardware_poll, NULL,
109 MBEDTLS_ENTROPY_MIN_HARDWARE,
110 MBEDTLS_ENTROPY_SOURCE_STRONG );
111#endif
112#if defined(MBEDTLS_ENTROPY_NV_SEED)
113 mbedtls_entropy_add_source( ctx, mbedtls_nv_seed_poll, NULL,
114 MBEDTLS_ENTROPY_BLOCK_SIZE,
115 MBEDTLS_ENTROPY_SOURCE_STRONG );
116#endif
117#endif /* MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES */
118}
119
120void mbedtls_entropy_free( mbedtls_entropy_context *ctx )
121{
122#if defined(MBEDTLS_HAVEGE_C)
123 mbedtls_havege_free( &ctx->havege_data );
124#endif
125#if defined(MBEDTLS_THREADING_C)
126 mbedtls_mutex_free( &ctx->mutex );
127#endif
128 mbedtls_zeroize( ctx, sizeof( mbedtls_entropy_context ) );
129}
130
131int mbedtls_entropy_add_source( mbedtls_entropy_context *ctx,
132 mbedtls_entropy_f_source_ptr f_source, void *p_source,
133 size_t threshold, int strong )
134{
135 int idx, ret = 0;
136
137#if defined(MBEDTLS_THREADING_C)
138 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
139 return( ret );
140#endif
141
142 idx = ctx->source_count;
143 if( idx >= MBEDTLS_ENTROPY_MAX_SOURCES )
144 {
145 ret = MBEDTLS_ERR_ENTROPY_MAX_SOURCES;
146 goto exit;
147 }
148
149 ctx->source[idx].f_source = f_source;
150 ctx->source[idx].p_source = p_source;
151 ctx->source[idx].threshold = threshold;
152 ctx->source[idx].strong = strong;
153
154 ctx->source_count++;
155
156exit:
157#if defined(MBEDTLS_THREADING_C)
158 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
159 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
160#endif
161
162 return( ret );
163}
164
165/*
166 * Entropy accumulator update
167 */
168static int entropy_update( mbedtls_entropy_context *ctx, unsigned char source_id,
169 const unsigned char *data, size_t len )
170{
171 unsigned char header[2];
172 unsigned char tmp[MBEDTLS_ENTROPY_BLOCK_SIZE];
173 size_t use_len = len;
174 const unsigned char *p = data;
175
176 if( use_len > MBEDTLS_ENTROPY_BLOCK_SIZE )
177 {
178#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
179 mbedtls_sha512( data, len, tmp, 0 );
180#else
181 mbedtls_sha256( data, len, tmp, 0 );
182#endif
183 p = tmp;
184 use_len = MBEDTLS_ENTROPY_BLOCK_SIZE;
185 }
186
187 header[0] = source_id;
188 header[1] = use_len & 0xFF;
189
190#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
191 mbedtls_sha512_update( &ctx->accumulator, header, 2 );
192 mbedtls_sha512_update( &ctx->accumulator, p, use_len );
193#else
194 mbedtls_sha256_update( &ctx->accumulator, header, 2 );
195 mbedtls_sha256_update( &ctx->accumulator, p, use_len );
196#endif
197
198 return( 0 );
199}
200
201int mbedtls_entropy_update_manual( mbedtls_entropy_context *ctx,
202 const unsigned char *data, size_t len )
203{
204 int ret;
205
206#if defined(MBEDTLS_THREADING_C)
207 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
208 return( ret );
209#endif
210
211 ret = entropy_update( ctx, MBEDTLS_ENTROPY_SOURCE_MANUAL, data, len );
212
213#if defined(MBEDTLS_THREADING_C)
214 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
215 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
216#endif
217
218 return( ret );
219}
220
221/*
222 * Run through the different sources to add entropy to our accumulator
223 */
224static int entropy_gather_internal( mbedtls_entropy_context *ctx )
225{
226 int ret, i, have_one_strong = 0;
227 unsigned char buf[MBEDTLS_ENTROPY_MAX_GATHER];
228 size_t olen;
229
230 if( ctx->source_count == 0 )
231 return( MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED );
232
233 /*
234 * Run through our entropy sources
235 */
236 for( i = 0; i < ctx->source_count; i++ )
237 {
238 if( ctx->source[i].strong == MBEDTLS_ENTROPY_SOURCE_STRONG )
239 have_one_strong = 1;
240
241 olen = 0;
242 if( ( ret = ctx->source[i].f_source( ctx->source[i].p_source,
243 buf, MBEDTLS_ENTROPY_MAX_GATHER, &olen ) ) != 0 )
244 {
245 return( ret );
246 }
247
248 /*
249 * Add if we actually gathered something
250 */
251 if( olen > 0 )
252 {
253 entropy_update( ctx, (unsigned char) i, buf, olen );
254 ctx->source[i].size += olen;
255 }
256 }
257
258 if( have_one_strong == 0 )
259 return( MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE );
260
261 return( 0 );
262}
263
264/*
265 * Thread-safe wrapper for entropy_gather_internal()
266 */
267int mbedtls_entropy_gather( mbedtls_entropy_context *ctx )
268{
269 int ret;
270
271#if defined(MBEDTLS_THREADING_C)
272 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
273 return( ret );
274#endif
275
276 ret = entropy_gather_internal( ctx );
277
278#if defined(MBEDTLS_THREADING_C)
279 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
280 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
281#endif
282
283 return( ret );
284}
285
286int mbedtls_entropy_func( void *data, unsigned char *output, size_t len )
287{
288 int ret, count = 0, i, done;
289 mbedtls_entropy_context *ctx = (mbedtls_entropy_context *) data;
290 unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
291
292 if( len > MBEDTLS_ENTROPY_BLOCK_SIZE )
293 return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
294
295#if defined(MBEDTLS_ENTROPY_NV_SEED)
296 /* Update the NV entropy seed before generating any entropy for outside
297 * use.
298 */
299 if( ctx->initial_entropy_run == 0 )
300 {
301 ctx->initial_entropy_run = 1;
302 if( ( ret = mbedtls_entropy_update_nv_seed( ctx ) ) != 0 )
303 return( ret );
304 }
305#endif
306
307#if defined(MBEDTLS_THREADING_C)
308 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
309 return( ret );
310#endif
311
312 /*
313 * Always gather extra entropy before a call
314 */
315 do
316 {
317 if( count++ > ENTROPY_MAX_LOOP )
318 {
319 ret = MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
320 goto exit;
321 }
322
323 if( ( ret = entropy_gather_internal( ctx ) ) != 0 )
324 goto exit;
325
326 done = 1;
327 for( i = 0; i < ctx->source_count; i++ )
328 if( ctx->source[i].size < ctx->source[i].threshold )
329 done = 0;
330 }
331 while( ! done );
332
333 memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
334
335#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
336 mbedtls_sha512_finish( &ctx->accumulator, buf );
337
338 /*
339 * Reset accumulator and counters and recycle existing entropy
340 */
341 memset( &ctx->accumulator, 0, sizeof( mbedtls_sha512_context ) );
342 mbedtls_sha512_starts( &ctx->accumulator, 0 );
343 mbedtls_sha512_update( &ctx->accumulator, buf, MBEDTLS_ENTROPY_BLOCK_SIZE );
344
345 /*
346 * Perform second SHA-512 on entropy
347 */
348 mbedtls_sha512( buf, MBEDTLS_ENTROPY_BLOCK_SIZE, buf, 0 );
349#else /* MBEDTLS_ENTROPY_SHA512_ACCUMULATOR */
350 mbedtls_sha256_finish( &ctx->accumulator, buf );
351
352 /*
353 * Reset accumulator and counters and recycle existing entropy
354 */
355 memset( &ctx->accumulator, 0, sizeof( mbedtls_sha256_context ) );
356 mbedtls_sha256_starts( &ctx->accumulator, 0 );
357 mbedtls_sha256_update( &ctx->accumulator, buf, MBEDTLS_ENTROPY_BLOCK_SIZE );
358
359 /*
360 * Perform second SHA-256 on entropy
361 */
362 mbedtls_sha256( buf, MBEDTLS_ENTROPY_BLOCK_SIZE, buf, 0 );
363#endif /* MBEDTLS_ENTROPY_SHA512_ACCUMULATOR */
364
365 for( i = 0; i < ctx->source_count; i++ )
366 ctx->source[i].size = 0;
367
368 memcpy( output, buf, len );
369
370 ret = 0;
371
372exit:
373#if defined(MBEDTLS_THREADING_C)
374 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
375 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
376#endif
377
378 return( ret );
379}
380
381#if defined(MBEDTLS_ENTROPY_NV_SEED)
382int mbedtls_entropy_update_nv_seed( mbedtls_entropy_context *ctx )
383{
384 int ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR;
385 unsigned char buf[ MBEDTLS_ENTROPY_MAX_SEED_SIZE ];
386
387 /* Read new seed and write it to NV */
388 if( ( ret = mbedtls_entropy_func( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 )
389 return( ret );
390
391 if( mbedtls_nv_seed_write( buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) < 0 )
392 return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR );
393
394 /* Manually update the remaining stream with a separator value to diverge */
395 memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
396 mbedtls_entropy_update_manual( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE );
397
398 return( 0 );
399}
400#endif /* MBEDTLS_ENTROPY_NV_SEED */
401
402#if defined(MBEDTLS_FS_IO)
403int mbedtls_entropy_write_seed_file( mbedtls_entropy_context *ctx, const char *path )
404{
405 int ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR;
406 FILE *f;
407 unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
408
409 if( ( f = fopen( path, "wb" ) ) == NULL )
410 return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR );
411
412 if( ( ret = mbedtls_entropy_func( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 )
413 goto exit;
414
415 if( fwrite( buf, 1, MBEDTLS_ENTROPY_BLOCK_SIZE, f ) != MBEDTLS_ENTROPY_BLOCK_SIZE )
416 {
417 ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR;
418 goto exit;
419 }
420
421 ret = 0;
422
423exit:
424 fclose( f );
425 return( ret );
426}
427
428int mbedtls_entropy_update_seed_file( mbedtls_entropy_context *ctx, const char *path )
429{
430 FILE *f;
431 size_t n;
432 unsigned char buf[ MBEDTLS_ENTROPY_MAX_SEED_SIZE ];
433
434 if( ( f = fopen( path, "rb" ) ) == NULL )
435 return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR );
436
437 fseek( f, 0, SEEK_END );
438 n = (size_t) ftell( f );
439 fseek( f, 0, SEEK_SET );
440
441 if( n > MBEDTLS_ENTROPY_MAX_SEED_SIZE )
442 n = MBEDTLS_ENTROPY_MAX_SEED_SIZE;
443
444 if( fread( buf, 1, n, f ) != n )
445 {
446 fclose( f );
447 return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR );
448 }
449
450 fclose( f );
451
452 mbedtls_entropy_update_manual( ctx, buf, n );
453
454 return( mbedtls_entropy_write_seed_file( ctx, path ) );
455}
456#endif /* MBEDTLS_FS_IO */
457
458#if defined(MBEDTLS_SELF_TEST)
459#if !defined(MBEDTLS_TEST_NULL_ENTROPY)
460/*
461 * Dummy source function
462 */
463static int entropy_dummy_source( void *data, unsigned char *output,
464 size_t len, size_t *olen )
465{
466 ((void) data);
467
468 memset( output, 0x2a, len );
469 *olen = len;
470
471 return( 0 );
472}
473#endif /* !MBEDTLS_TEST_NULL_ENTROPY */
474
475#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
476
477static int mbedtls_entropy_source_self_test_gather( unsigned char *buf, size_t buf_len )
478{
479 int ret = 0;
480 size_t entropy_len = 0;
481 size_t olen = 0;
482 size_t attempts = buf_len;
483
484 while( attempts > 0 && entropy_len < buf_len )
485 {
486 if( ( ret = mbedtls_hardware_poll( NULL, buf + entropy_len,
487 buf_len - entropy_len, &olen ) ) != 0 )
488 return( ret );
489
490 entropy_len += olen;
491 attempts--;
492 }
493
494 if( entropy_len < buf_len )
495 {
496 ret = 1;
497 }
498
499 return( ret );
500}
501
502
503static int mbedtls_entropy_source_self_test_check_bits( const unsigned char *buf,
504 size_t buf_len )
505{
506 unsigned char set= 0xFF;
507 unsigned char unset = 0x00;
508 size_t i;
509
510 for( i = 0; i < buf_len; i++ )
511 {
512 set &= buf[i];
513 unset |= buf[i];
514 }
515
516 return( set == 0xFF || unset == 0x00 );
517}
518
519/*
520 * A test to ensure hat the entropy sources are functioning correctly
521 * and there is no obvious failure. The test performs the following checks:
522 * - The entropy source is not providing only 0s (all bits unset) or 1s (all
523 * bits set).
524 * - The entropy source is not providing values in a pattern. Because the
525 * hardware could be providing data in an arbitrary length, this check polls
526 * the hardware entropy source twice and compares the result to ensure they
527 * are not equal.
528 * - The error code returned by the entropy source is not an error.
529 */
530int mbedtls_entropy_source_self_test( int verbose )
531{
532 int ret = 0;
533 unsigned char buf0[2 * sizeof( unsigned long long int )];
534 unsigned char buf1[2 * sizeof( unsigned long long int )];
535
536 if( verbose != 0 )
537 mbedtls_printf( " ENTROPY_BIAS test: " );
538
539 memset( buf0, 0x00, sizeof( buf0 ) );
540 memset( buf1, 0x00, sizeof( buf1 ) );
541
542 if( ( ret = mbedtls_entropy_source_self_test_gather( buf0, sizeof( buf0 ) ) ) != 0 )
543 goto cleanup;
544 if( ( ret = mbedtls_entropy_source_self_test_gather( buf1, sizeof( buf1 ) ) ) != 0 )
545 goto cleanup;
546
547 /* Make sure that the returned values are not all 0 or 1 */
548 if( ( ret = mbedtls_entropy_source_self_test_check_bits( buf0, sizeof( buf0 ) ) ) != 0 )
549 goto cleanup;
550 if( ( ret = mbedtls_entropy_source_self_test_check_bits( buf1, sizeof( buf1 ) ) ) != 0 )
551 goto cleanup;
552
553 /* Make sure that the entropy source is not returning values in a
554 * pattern */
555 ret = memcmp( buf0, buf1, sizeof( buf0 ) ) == 0;
556
557cleanup:
558 if( verbose != 0 )
559 {
560 if( ret != 0 )
561 mbedtls_printf( "failed\n" );
562 else
563 mbedtls_printf( "passed\n" );
564
565 mbedtls_printf( "\n" );
566 }
567
568 return( ret != 0 );
569}
570
571#endif /* MBEDTLS_ENTROPY_HARDWARE_ALT */
572
573/*
574 * The actual entropy quality is hard to test, but we can at least
575 * test that the functions don't cause errors and write the correct
576 * amount of data to buffers.
577 */
578int mbedtls_entropy_self_test( int verbose )
579{
580 int ret = 1;
581#if !defined(MBEDTLS_TEST_NULL_ENTROPY)
582 mbedtls_entropy_context ctx;
583 unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 };
584 unsigned char acc[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 };
585 size_t i, j;
586#endif /* !MBEDTLS_TEST_NULL_ENTROPY */
587
588 if( verbose != 0 )
589 mbedtls_printf( " ENTROPY test: " );
590
591#if !defined(MBEDTLS_TEST_NULL_ENTROPY)
592 mbedtls_entropy_init( &ctx );
593
594 /* First do a gather to make sure we have default sources */
595 if( ( ret = mbedtls_entropy_gather( &ctx ) ) != 0 )
596 goto cleanup;
597
598 ret = mbedtls_entropy_add_source( &ctx, entropy_dummy_source, NULL, 16,
599 MBEDTLS_ENTROPY_SOURCE_WEAK );
600 if( ret != 0 )
601 goto cleanup;
602
603 if( ( ret = mbedtls_entropy_update_manual( &ctx, buf, sizeof buf ) ) != 0 )
604 goto cleanup;
605
606 /*
607 * To test that mbedtls_entropy_func writes correct number of bytes:
608 * - use the whole buffer and rely on ASan to detect overruns
609 * - collect entropy 8 times and OR the result in an accumulator:
610 * any byte should then be 0 with probably 2^(-64), so requiring
611 * each of the 32 or 64 bytes to be non-zero has a false failure rate
612 * of at most 2^(-58) which is acceptable.
613 */
614 for( i = 0; i < 8; i++ )
615 {
616 if( ( ret = mbedtls_entropy_func( &ctx, buf, sizeof( buf ) ) ) != 0 )
617 goto cleanup;
618
619 for( j = 0; j < sizeof( buf ); j++ )
620 acc[j] |= buf[j];
621 }
622
623 for( j = 0; j < sizeof( buf ); j++ )
624 {
625 if( acc[j] == 0 )
626 {
627 ret = 1;
628 goto cleanup;
629 }
630 }
631
632#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
633 if( ( ret = mbedtls_entropy_source_self_test( 0 ) ) != 0 )
634 goto cleanup;
635#endif
636
637cleanup:
638 mbedtls_entropy_free( &ctx );
639#endif /* !MBEDTLS_TEST_NULL_ENTROPY */
640
641 if( verbose != 0 )
642 {
643 if( ret != 0 )
644 mbedtls_printf( "failed\n" );
645 else
646 mbedtls_printf( "passed\n" );
647
648 mbedtls_printf( "\n" );
649 }
650
651 return( ret != 0 );
652}
653#endif /* MBEDTLS_SELF_TEST */
654
655#endif /* MBEDTLS_ENTROPY_C */