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Paul Bakker5121ce52009-01-03 21:22:43 +00001/*
2 * Diffie-Hellman-Merkle key exchange (server side)
3 *
Manuel Pégourié-Gonnard6fb81872015-07-27 11:11:48 +02004 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
Manuel Pégourié-Gonnard37ff1402015-09-04 14:21:07 +02005 * 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.
Paul Bakkerb96f1542010-07-18 20:36:00 +000018 *
Manuel Pégourié-Gonnardfe446432015-03-06 13:17:10 +000019 * This file is part of mbed TLS (https://tls.mbed.org)
Paul Bakker5121ce52009-01-03 21:22:43 +000020 */
21
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020022#if !defined(MBEDTLS_CONFIG_FILE)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000023#include "mbedtls/config.h"
Manuel Pégourié-Gonnardcef4ad22014-04-29 12:39:06 +020024#else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020025#include MBEDTLS_CONFIG_FILE
Manuel Pégourié-Gonnardcef4ad22014-04-29 12:39:06 +020026#endif
Paul Bakker5121ce52009-01-03 21:22:43 +000027
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020028#if defined(MBEDTLS_PLATFORM_C)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000029#include "mbedtls/platform.h"
Rich Evansf90016a2015-01-19 14:26:37 +000030#else
Rich Evans18b78c72015-02-11 14:06:19 +000031#include <stdio.h>
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020032#define mbedtls_printf printf
-~- redtangent ~-~9fa2e862016-05-26 10:07:49 +010033#define mbedtls_time_t time_t
Rich Evansf90016a2015-01-19 14:26:37 +000034#endif
35
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020036#if defined(MBEDTLS_AES_C) && defined(MBEDTLS_DHM_C) && \
37 defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_NET_C) && \
38 defined(MBEDTLS_RSA_C) && defined(MBEDTLS_SHA256_C) && \
Janos Follath9fe6f922016-10-07 14:17:56 +010039 defined(MBEDTLS_FS_IO) && defined(MBEDTLS_CTR_DRBG_C) && \
40 defined(MBEDTLS_SHA1_C)
Andres AG788aa4a2016-09-14 14:32:09 +010041#include "mbedtls/net_sockets.h"
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000042#include "mbedtls/aes.h"
43#include "mbedtls/dhm.h"
44#include "mbedtls/rsa.h"
45#include "mbedtls/sha1.h"
46#include "mbedtls/entropy.h"
47#include "mbedtls/ctr_drbg.h"
Paul Bakker5121ce52009-01-03 21:22:43 +000048
Rich Evans18b78c72015-02-11 14:06:19 +000049#include <stdio.h>
50#include <string.h>
51#endif
52
Manuel Pégourié-Gonnardc0d74942015-06-23 12:30:57 +020053#define SERVER_PORT "11999"
Paul Bakker5121ce52009-01-03 21:22:43 +000054#define PLAINTEXT "==Hello there!=="
55
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020056#if !defined(MBEDTLS_AES_C) || !defined(MBEDTLS_DHM_C) || \
57 !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_NET_C) || \
58 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_C) || \
Janos Follath9fe6f922016-10-07 14:17:56 +010059 !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C) || \
60 !defined(MBEDTLS_SHA1_C)
Rich Evans85b05ec2015-02-12 11:37:29 +000061int main( void )
Paul Bakker5690efc2011-05-26 13:16:06 +000062{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020063 mbedtls_printf("MBEDTLS_AES_C and/or MBEDTLS_DHM_C and/or MBEDTLS_ENTROPY_C "
64 "and/or MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
65 "MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO and/or "
66 "MBEDTLS_CTR_DRBG_C not defined.\n");
Paul Bakker5690efc2011-05-26 13:16:06 +000067 return( 0 );
68}
69#else
Rich Evans85b05ec2015-02-12 11:37:29 +000070int main( void )
Paul Bakker5121ce52009-01-03 21:22:43 +000071{
72 FILE *f;
73
Paul Bakker23986e52011-04-24 08:57:21 +000074 int ret;
75 size_t n, buflen;
Manuel Pégourié-Gonnard5db64322015-06-30 15:40:39 +020076 mbedtls_net_context listen_fd, client_fd;
Paul Bakker5121ce52009-01-03 21:22:43 +000077
Paul Bakker520ea912012-10-24 14:17:01 +000078 unsigned char buf[2048];
Manuel Pégourié-Gonnard102a6202015-08-27 21:51:44 +020079 unsigned char hash[32];
Paul Bakker5121ce52009-01-03 21:22:43 +000080 unsigned char buf2[2];
Paul Bakkeref3f8c72013-06-24 13:01:08 +020081 const char *pers = "dh_server";
Paul Bakker5121ce52009-01-03 21:22:43 +000082
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020083 mbedtls_entropy_context entropy;
84 mbedtls_ctr_drbg_context ctr_drbg;
85 mbedtls_rsa_context rsa;
86 mbedtls_dhm_context dhm;
87 mbedtls_aes_context aes;
Paul Bakker5121ce52009-01-03 21:22:43 +000088
Hanno Beckerc95fad32017-08-23 06:44:30 +010089 mbedtls_mpi N, P, Q, D, E;
90
Manuel Pégourié-Gonnard5db64322015-06-30 15:40:39 +020091 mbedtls_net_init( &listen_fd );
92 mbedtls_net_init( &client_fd );
93 mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_SHA256 );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020094 mbedtls_dhm_init( &dhm );
95 mbedtls_aes_init( &aes );
Manuel Pégourié-Gonnardec160c02015-04-28 22:52:30 +020096 mbedtls_ctr_drbg_init( &ctr_drbg );
Paul Bakker5121ce52009-01-03 21:22:43 +000097
Hanno Beckerc95fad32017-08-23 06:44:30 +010098 mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
99 mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E );
100
Paul Bakker5121ce52009-01-03 21:22:43 +0000101 /*
102 * 1. Setup the RNG
103 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200104 mbedtls_printf( "\n . Seeding the random number generator" );
Paul Bakker5121ce52009-01-03 21:22:43 +0000105 fflush( stdout );
106
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200107 mbedtls_entropy_init( &entropy );
Manuel Pégourié-Gonnardec160c02015-04-28 22:52:30 +0200108 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
Paul Bakkeref3f8c72013-06-24 13:01:08 +0200109 (const unsigned char *) pers,
110 strlen( pers ) ) ) != 0 )
Paul Bakker508ad5a2011-12-04 17:09:26 +0000111 {
Manuel Pégourié-Gonnardec160c02015-04-28 22:52:30 +0200112 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
Paul Bakker508ad5a2011-12-04 17:09:26 +0000113 goto exit;
114 }
Paul Bakker5121ce52009-01-03 21:22:43 +0000115
116 /*
117 * 2a. Read the server's private RSA key
118 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200119 mbedtls_printf( "\n . Reading private key from rsa_priv.txt" );
Paul Bakker5121ce52009-01-03 21:22:43 +0000120 fflush( stdout );
121
122 if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
123 {
124 ret = 1;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200125 mbedtls_printf( " failed\n ! Could not open rsa_priv.txt\n" \
Paul Bakker5121ce52009-01-03 21:22:43 +0000126 " ! Please run rsa_genkey first\n\n" );
127 goto exit;
128 }
129
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200130 mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
Paul Bakker5121ce52009-01-03 21:22:43 +0000131
Hanno Beckerc95fad32017-08-23 06:44:30 +0100132 if( ( ret = mbedtls_mpi_read_file( &N , 16, f ) ) != 0 ||
133 ( ret = mbedtls_mpi_read_file( &E , 16, f ) ) != 0 ||
134 ( ret = mbedtls_mpi_read_file( &D , 16, f ) ) != 0 ||
135 ( ret = mbedtls_mpi_read_file( &P , 16, f ) ) != 0 ||
136 ( ret = mbedtls_mpi_read_file( &Q , 16, f ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000137 {
Hanno Beckerc95fad32017-08-23 06:44:30 +0100138 mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n",
139 ret );
Janos Follath98e28a72016-05-31 14:03:54 +0100140 fclose( f );
Paul Bakker5121ce52009-01-03 21:22:43 +0000141 goto exit;
142 }
Paul Bakker5121ce52009-01-03 21:22:43 +0000143 fclose( f );
144
Hanno Beckerc95fad32017-08-23 06:44:30 +0100145 if( ( ret = mbedtls_rsa_import( &rsa, &N, &P, &Q, &D, &E ) ) != 0 )
146 {
147 mbedtls_printf( " failed\n ! mbedtls_rsa_import returned %d\n\n",
148 ret );
149 goto exit;
150 }
151
Hanno Becker7f25f852017-10-10 16:56:22 +0100152 if( ( ret = mbedtls_rsa_complete( &rsa ) ) != 0 )
Hanno Beckerc95fad32017-08-23 06:44:30 +0100153 {
154 mbedtls_printf( " failed\n ! mbedtls_rsa_complete returned %d\n\n",
155 ret );
156 goto exit;
157 }
158
Paul Bakker5121ce52009-01-03 21:22:43 +0000159 /*
160 * 2b. Get the DHM modulus and generator
161 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200162 mbedtls_printf( "\n . Reading DH parameters from dh_prime.txt" );
Paul Bakker5121ce52009-01-03 21:22:43 +0000163 fflush( stdout );
164
165 if( ( f = fopen( "dh_prime.txt", "rb" ) ) == NULL )
166 {
167 ret = 1;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200168 mbedtls_printf( " failed\n ! Could not open dh_prime.txt\n" \
Paul Bakker5121ce52009-01-03 21:22:43 +0000169 " ! Please run dh_genprime first\n\n" );
170 goto exit;
171 }
172
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200173 if( mbedtls_mpi_read_file( &dhm.P, 16, f ) != 0 ||
174 mbedtls_mpi_read_file( &dhm.G, 16, f ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000175 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200176 mbedtls_printf( " failed\n ! Invalid DH parameter file\n\n" );
Janos Follath98e28a72016-05-31 14:03:54 +0100177 fclose( f );
Paul Bakker5121ce52009-01-03 21:22:43 +0000178 goto exit;
179 }
180
181 fclose( f );
182
183 /*
184 * 3. Wait for a client to connect
185 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200186 mbedtls_printf( "\n . Waiting for a remote connection" );
Paul Bakker5121ce52009-01-03 21:22:43 +0000187 fflush( stdout );
188
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200189 if( ( ret = mbedtls_net_bind( &listen_fd, NULL, SERVER_PORT, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000190 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200191 mbedtls_printf( " failed\n ! mbedtls_net_bind returned %d\n\n", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +0000192 goto exit;
193 }
194
Manuel Pégourié-Gonnard5db64322015-06-30 15:40:39 +0200195 if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
Manuel Pégourié-Gonnard0b104b02015-05-14 21:52:40 +0200196 NULL, 0, NULL ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000197 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200198 mbedtls_printf( " failed\n ! mbedtls_net_accept returned %d\n\n", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +0000199 goto exit;
200 }
201
202 /*
203 * 4. Setup the DH parameters (P,G,Ys)
204 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200205 mbedtls_printf( "\n . Sending the server's DH parameters" );
Paul Bakker5121ce52009-01-03 21:22:43 +0000206 fflush( stdout );
207
208 memset( buf, 0, sizeof( buf ) );
209
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200210 if( ( ret = mbedtls_dhm_make_params( &dhm, (int) mbedtls_mpi_size( &dhm.P ), buf, &n,
211 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000212 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200213 mbedtls_printf( " failed\n ! mbedtls_dhm_make_params returned %d\n\n", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +0000214 goto exit;
215 }
216
217 /*
218 * 5. Sign the parameters and send them
219 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200220 mbedtls_sha1( buf, n, hash );
Paul Bakker5121ce52009-01-03 21:22:43 +0000221
222 buf[n ] = (unsigned char)( rsa.len >> 8 );
223 buf[n + 1] = (unsigned char)( rsa.len );
224
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200225 if( ( ret = mbedtls_rsa_pkcs1_sign( &rsa, NULL, NULL, MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_SHA256,
Paul Bakker5121ce52009-01-03 21:22:43 +0000226 0, hash, buf + n + 2 ) ) != 0 )
227 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200228 mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_sign returned %d\n\n", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +0000229 goto exit;
230 }
231
232 buflen = n + 2 + rsa.len;
233 buf2[0] = (unsigned char)( buflen >> 8 );
234 buf2[1] = (unsigned char)( buflen );
235
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200236 if( ( ret = mbedtls_net_send( &client_fd, buf2, 2 ) ) != 2 ||
237 ( ret = mbedtls_net_send( &client_fd, buf, buflen ) ) != (int) buflen )
Paul Bakker5121ce52009-01-03 21:22:43 +0000238 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200239 mbedtls_printf( " failed\n ! mbedtls_net_send returned %d\n\n", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +0000240 goto exit;
241 }
242
243 /*
244 * 6. Get the client's public value: Yc = G ^ Xc mod P
245 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200246 mbedtls_printf( "\n . Receiving the client's public value" );
Paul Bakker5121ce52009-01-03 21:22:43 +0000247 fflush( stdout );
248
249 memset( buf, 0, sizeof( buf ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000250
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200251 if( ( ret = mbedtls_net_recv( &client_fd, buf, n ) ) != (int) n )
Paul Bakker5121ce52009-01-03 21:22:43 +0000252 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200253 mbedtls_printf( " failed\n ! mbedtls_net_recv returned %d\n\n", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +0000254 goto exit;
255 }
256
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200257 if( ( ret = mbedtls_dhm_read_public( &dhm, buf, dhm.len ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000258 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200259 mbedtls_printf( " failed\n ! mbedtls_dhm_read_public returned %d\n\n", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +0000260 goto exit;
261 }
262
263 /*
264 * 7. Derive the shared secret: K = Ys ^ Xc mod P
265 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200266 mbedtls_printf( "\n . Shared secret: " );
Paul Bakker5121ce52009-01-03 21:22:43 +0000267 fflush( stdout );
268
Manuel Pégourié-Gonnard33352052015-06-02 16:17:08 +0100269 if( ( ret = mbedtls_dhm_calc_secret( &dhm, buf, sizeof( buf ), &n,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200270 mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000271 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200272 mbedtls_printf( " failed\n ! mbedtls_dhm_calc_secret returned %d\n\n", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +0000273 goto exit;
274 }
275
276 for( n = 0; n < 16; n++ )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200277 mbedtls_printf( "%02x", buf[n] );
Paul Bakker5121ce52009-01-03 21:22:43 +0000278
279 /*
280 * 8. Setup the AES-256 encryption key
281 *
282 * This is an overly simplified example; best practice is
283 * to hash the shared secret with a random value to derive
284 * the keying material for the encryption/decryption keys
285 * and MACs.
286 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200287 mbedtls_printf( "...\n . Encrypting and sending the ciphertext" );
Paul Bakker5121ce52009-01-03 21:22:43 +0000288 fflush( stdout );
289
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200290 mbedtls_aes_setkey_enc( &aes, buf, 256 );
Paul Bakker5121ce52009-01-03 21:22:43 +0000291 memcpy( buf, PLAINTEXT, 16 );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200292 mbedtls_aes_crypt_ecb( &aes, MBEDTLS_AES_ENCRYPT, buf, buf );
Paul Bakker5121ce52009-01-03 21:22:43 +0000293
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200294 if( ( ret = mbedtls_net_send( &client_fd, buf, 16 ) ) != 16 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000295 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200296 mbedtls_printf( " failed\n ! mbedtls_net_send returned %d\n\n", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +0000297 goto exit;
298 }
299
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200300 mbedtls_printf( "\n\n" );
Paul Bakker5121ce52009-01-03 21:22:43 +0000301
302exit:
303
Hanno Beckerc95fad32017-08-23 06:44:30 +0100304 mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
305 mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E );
306
Manuel Pégourié-Gonnard3d7d00a2015-06-30 15:55:03 +0200307 mbedtls_net_free( &client_fd );
308 mbedtls_net_free( &listen_fd );
Paul Bakker0c226102014-04-17 16:02:36 +0200309
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200310 mbedtls_aes_free( &aes );
311 mbedtls_rsa_free( &rsa );
312 mbedtls_dhm_free( &dhm );
313 mbedtls_ctr_drbg_free( &ctr_drbg );
314 mbedtls_entropy_free( &entropy );
Paul Bakker5121ce52009-01-03 21:22:43 +0000315
Paul Bakkercce9d772011-11-18 14:26:47 +0000316#if defined(_WIN32)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200317 mbedtls_printf( " + Press Enter to exit this program.\n" );
Paul Bakker5121ce52009-01-03 21:22:43 +0000318 fflush( stdout ); getchar();
319#endif
320
321 return( ret );
322}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200323#endif /* MBEDTLS_AES_C && MBEDTLS_DHM_C && MBEDTLS_ENTROPY_C &&
324 MBEDTLS_NET_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
325 MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */