Merge pull request #80 from yanesca/iotcrypt-685-rewrite-dh-example
Remove Diffie-Hellman examples
This commit is contained in:
Jaeden Amero
GitHub
commit
98c2208573
9 changed files with 2 additions and 1068 deletions
2
programs/.gitignore
vendored
2
programs/.gitignore
vendored
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@ -9,9 +9,7 @@ hash/hello
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hash/md5sum
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hash/sha1sum
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hash/sha2sum
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pkey/dh_client
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pkey/dh_genprime
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pkey/dh_server
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pkey/ecdsa
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pkey/ecdh_curve25519
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pkey/gen_key
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@ -49,8 +49,7 @@ endif
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APPS = aes/aescrypt2$(EXEXT) aes/crypt_and_hash$(EXEXT) \
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hash/hello$(EXEXT) hash/generic_sum$(EXEXT) \
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pkey/dh_client$(EXEXT) \
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pkey/dh_genprime$(EXEXT) pkey/dh_server$(EXEXT) \
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pkey/dh_genprime$(EXEXT) \
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pkey/ecdh_curve25519$(EXEXT) \
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pkey/ecdsa$(EXEXT) pkey/gen_key$(EXEXT) \
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pkey/key_app$(EXEXT) pkey/key_app_writer$(EXEXT) \
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@ -123,18 +122,10 @@ hash/generic_sum$(EXEXT): hash/generic_sum.c $(DEP)
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echo " CC hash/generic_sum.c"
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$(CC) $(LOCAL_CFLAGS) $(CFLAGS) hash/generic_sum.c $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
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pkey/dh_client$(EXEXT): pkey/dh_client.c $(DEP)
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echo " CC pkey/dh_client.c"
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$(CC) $(LOCAL_CFLAGS) $(CFLAGS) pkey/dh_client.c $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
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pkey/dh_genprime$(EXEXT): pkey/dh_genprime.c $(DEP)
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echo " CC pkey/dh_genprime.c"
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$(CC) $(LOCAL_CFLAGS) $(CFLAGS) pkey/dh_genprime.c $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
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pkey/dh_server$(EXEXT): pkey/dh_server.c $(DEP)
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echo " CC pkey/dh_server.c"
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$(CC) $(LOCAL_CFLAGS) $(CFLAGS) pkey/dh_server.c $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
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pkey/ecdh_curve25519$(EXEXT): pkey/ecdh_curve25519.c $(DEP)
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echo " CC pkey/ecdh_curve25519.c"
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$(CC) $(LOCAL_CFLAGS) $(CFLAGS) pkey/ecdh_curve25519.c $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
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@ -44,8 +44,6 @@ This subdirectory mostly contains sample programs that illustrate specific featu
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### Diffie-Hellman key exchange examples
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* [`pkey/dh_client.c`](pkey/dh_client.c), [`pkey/dh_server.c`](pkey/dh_server.c): secure channel demonstrators (client, server). This pair of programs illustrates how to set up a secure channel using RSA for authentication and Diffie-Hellman to generate a shared AES session key.
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* [`pkey/ecdh_curve25519.c`](pkey/ecdh_curve25519.c): demonstration of a elliptic curve Diffie-Hellman (ECDH) key agreement.
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### Bignum (`mpi`) usage examples
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@ -1,12 +1,6 @@
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add_executable(dh_client dh_client.c)
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target_link_libraries(dh_client mbedtls)
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add_executable(dh_genprime dh_genprime.c)
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target_link_libraries(dh_genprime mbedtls)
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add_executable(dh_server dh_server.c)
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target_link_libraries(dh_server mbedtls)
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add_executable(ecdh_curve25519 ecdh_curve25519.c)
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target_link_libraries(ecdh_curve25519 mbedtls)
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@ -58,6 +52,6 @@ target_link_libraries(pk_encrypt mbedtls)
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add_executable(pk_decrypt pk_decrypt.c)
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target_link_libraries(pk_decrypt mbedtls)
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install(TARGETS dh_client dh_genprime dh_server key_app mpi_demo rsa_genkey rsa_sign rsa_verify rsa_encrypt rsa_decrypt pk_encrypt pk_decrypt pk_sign pk_verify gen_key
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install(TARGETS dh_genprime key_app mpi_demo rsa_genkey rsa_sign rsa_verify rsa_encrypt rsa_decrypt pk_encrypt pk_decrypt pk_sign pk_verify gen_key
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DESTINATION "bin"
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PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)
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@ -1,325 +0,0 @@
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/*
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* Diffie-Hellman-Merkle key exchange (client side)
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#include <stdlib.h>
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#define mbedtls_printf printf
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#define mbedtls_time_t time_t
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#define mbedtls_exit exit
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#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
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#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
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#endif /* MBEDTLS_PLATFORM_C */
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#if defined(MBEDTLS_AES_C) && defined(MBEDTLS_DHM_C) && \
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defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_NET_C) && \
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defined(MBEDTLS_RSA_C) && defined(MBEDTLS_SHA256_C) && \
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defined(MBEDTLS_FS_IO) && defined(MBEDTLS_CTR_DRBG_C) && \
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defined(MBEDTLS_SHA1_C)
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#include "mbedtls/net_sockets.h"
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#include "mbedtls/aes.h"
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#include "mbedtls/dhm.h"
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#include "mbedtls/rsa.h"
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#include "mbedtls/sha1.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include <stdio.h>
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#include <string.h>
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#endif
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#define SERVER_NAME "localhost"
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#define SERVER_PORT "11999"
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#if !defined(MBEDTLS_AES_C) || !defined(MBEDTLS_DHM_C) || \
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!defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_NET_C) || \
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!defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_C) || \
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!defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C) || \
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!defined(MBEDTLS_SHA1_C)
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int main( void )
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{
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mbedtls_printf("MBEDTLS_AES_C and/or MBEDTLS_DHM_C and/or MBEDTLS_ENTROPY_C "
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"and/or MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
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"MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO and/or "
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"MBEDTLS_CTR_DRBG_C not defined.\n");
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return( 0 );
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}
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#else
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#if defined(MBEDTLS_CHECK_PARAMS)
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#include "mbedtls/platform_util.h"
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void mbedtls_param_failed( const char *failure_condition,
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const char *file,
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int line )
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{
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mbedtls_printf( "%s:%i: Input param failed - %s\n",
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file, line, failure_condition );
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mbedtls_exit( MBEDTLS_EXIT_FAILURE );
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}
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#endif
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int main( void )
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{
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FILE *f;
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int ret = 1;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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size_t n, buflen;
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mbedtls_net_context server_fd;
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unsigned char *p, *end;
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unsigned char buf[2048];
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unsigned char hash[32];
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const char *pers = "dh_client";
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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mbedtls_rsa_context rsa;
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mbedtls_dhm_context dhm;
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mbedtls_aes_context aes;
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mbedtls_net_init( &server_fd );
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mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_SHA256 );
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mbedtls_dhm_init( &dhm );
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mbedtls_aes_init( &aes );
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mbedtls_ctr_drbg_init( &ctr_drbg );
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/*
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* 1. Setup the RNG
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*/
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mbedtls_printf( "\n . Seeding the random number generator" );
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fflush( stdout );
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mbedtls_entropy_init( &entropy );
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if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
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(const unsigned char *) pers,
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strlen( pers ) ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
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goto exit;
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}
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/*
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* 2. Read the server's public RSA key
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*/
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mbedtls_printf( "\n . Reading public key from rsa_pub.txt" );
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fflush( stdout );
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if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
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{
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mbedtls_printf( " failed\n ! Could not open rsa_pub.txt\n" \
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" ! Please run rsa_genkey first\n\n" );
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goto exit;
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}
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mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
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if( ( ret = mbedtls_mpi_read_file( &rsa.N, 16, f ) ) != 0 ||
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( ret = mbedtls_mpi_read_file( &rsa.E, 16, f ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n", ret );
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fclose( f );
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goto exit;
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}
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rsa.len = ( mbedtls_mpi_bitlen( &rsa.N ) + 7 ) >> 3;
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fclose( f );
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/*
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* 3. Initiate the connection
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*/
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mbedtls_printf( "\n . Connecting to tcp/%s/%s", SERVER_NAME,
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SERVER_PORT );
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fflush( stdout );
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if( ( ret = mbedtls_net_connect( &server_fd, SERVER_NAME,
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SERVER_PORT, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", ret );
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goto exit;
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}
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/*
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* 4a. First get the buffer length
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*/
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mbedtls_printf( "\n . Receiving the server's DH parameters" );
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fflush( stdout );
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memset( buf, 0, sizeof( buf ) );
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if( ( ret = mbedtls_net_recv( &server_fd, buf, 2 ) ) != 2 )
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{
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mbedtls_printf( " failed\n ! mbedtls_net_recv returned %d\n\n", ret );
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goto exit;
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}
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n = buflen = ( buf[0] << 8 ) | buf[1];
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if( buflen < 1 || buflen > sizeof( buf ) )
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{
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mbedtls_printf( " failed\n ! Got an invalid buffer length\n\n" );
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goto exit;
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}
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/*
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* 4b. Get the DHM parameters: P, G and Ys = G^Xs mod P
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*/
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memset( buf, 0, sizeof( buf ) );
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if( ( ret = mbedtls_net_recv( &server_fd, buf, n ) ) != (int) n )
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{
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mbedtls_printf( " failed\n ! mbedtls_net_recv returned %d\n\n", ret );
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goto exit;
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}
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p = buf, end = buf + buflen;
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if( ( ret = mbedtls_dhm_read_params( &dhm, &p, end ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_dhm_read_params returned %d\n\n", ret );
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goto exit;
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}
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if( dhm.len < 64 || dhm.len > 512 )
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{
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mbedtls_printf( " failed\n ! Invalid DHM modulus size\n\n" );
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goto exit;
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}
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/*
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* 5. Check that the server's RSA signature matches
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* the SHA-256 hash of (P,G,Ys)
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*/
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mbedtls_printf( "\n . Verifying the server's RSA signature" );
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fflush( stdout );
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p += 2;
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if( ( n = (size_t) ( end - p ) ) != rsa.len )
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{
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mbedtls_printf( " failed\n ! Invalid RSA signature size\n\n" );
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goto exit;
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}
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if( ( ret = mbedtls_sha1_ret( buf, (int)( p - 2 - buf ), hash ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_sha1_ret returned %d\n\n", ret );
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goto exit;
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}
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if( ( ret = mbedtls_rsa_pkcs1_verify( &rsa, NULL, NULL, MBEDTLS_RSA_PUBLIC,
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MBEDTLS_MD_SHA256, 0, hash, p ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_verify returned %d\n\n", ret );
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goto exit;
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}
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/*
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* 6. Send our public value: Yc = G ^ Xc mod P
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*/
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mbedtls_printf( "\n . Sending own public value to server" );
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fflush( stdout );
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n = dhm.len;
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if( ( ret = mbedtls_dhm_make_public( &dhm, (int) dhm.len, buf, n,
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mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_dhm_make_public returned %d\n\n", ret );
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goto exit;
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}
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if( ( ret = mbedtls_net_send( &server_fd, buf, n ) ) != (int) n )
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{
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mbedtls_printf( " failed\n ! mbedtls_net_send returned %d\n\n", ret );
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goto exit;
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}
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/*
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* 7. Derive the shared secret: K = Ys ^ Xc mod P
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*/
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mbedtls_printf( "\n . Shared secret: " );
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fflush( stdout );
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if( ( ret = mbedtls_dhm_calc_secret( &dhm, buf, sizeof( buf ), &n,
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mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_dhm_calc_secret returned %d\n\n", ret );
|
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goto exit;
|
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}
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for( n = 0; n < 16; n++ )
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mbedtls_printf( "%02x", buf[n] );
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/*
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* 8. Setup the AES-256 decryption key
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*
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* This is an overly simplified example; best practice is
|
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* to hash the shared secret with a random value to derive
|
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* the keying material for the encryption/decryption keys,
|
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* IVs and MACs.
|
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*/
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mbedtls_printf( "...\n . Receiving and decrypting the ciphertext" );
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fflush( stdout );
|
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|
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mbedtls_aes_setkey_dec( &aes, buf, 256 );
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memset( buf, 0, sizeof( buf ) );
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if( ( ret = mbedtls_net_recv( &server_fd, buf, 16 ) ) != 16 )
|
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{
|
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mbedtls_printf( " failed\n ! mbedtls_net_recv returned %d\n\n", ret );
|
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goto exit;
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||||
}
|
||||
|
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mbedtls_aes_crypt_ecb( &aes, MBEDTLS_AES_DECRYPT, buf, buf );
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buf[16] = '\0';
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mbedtls_printf( "\n . Plaintext is \"%s\"\n\n", (char *) buf );
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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mbedtls_net_free( &server_fd );
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mbedtls_aes_free( &aes );
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mbedtls_rsa_free( &rsa );
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mbedtls_dhm_free( &dhm );
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mbedtls_ctr_drbg_free( &ctr_drbg );
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mbedtls_entropy_free( &entropy );
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#if defined(_WIN32)
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mbedtls_printf( " + Press Enter to exit this program.\n" );
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fflush( stdout ); getchar();
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#endif
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return( exit_code );
|
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}
|
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#endif /* MBEDTLS_AES_C && MBEDTLS_DHM_C && MBEDTLS_ENTROPY_C &&
|
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MBEDTLS_NET_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
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MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
|
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|
|
@ -1,348 +0,0 @@
|
|||
/*
|
||||
* Diffie-Hellman-Merkle key exchange (server side)
|
||||
*
|
||||
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
|
||||
* SPDX-License-Identifier: Apache-2.0
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License"); you may
|
||||
* not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
||||
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*
|
||||
* This file is part of mbed TLS (https://tls.mbed.org)
|
||||
*/
|
||||
|
||||
#if !defined(MBEDTLS_CONFIG_FILE)
|
||||
#include "mbedtls/config.h"
|
||||
#else
|
||||
#include MBEDTLS_CONFIG_FILE
|
||||
#endif
|
||||
|
||||
#if defined(MBEDTLS_PLATFORM_C)
|
||||
#include "mbedtls/platform.h"
|
||||
#else
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#define mbedtls_printf printf
|
||||
#define mbedtls_time_t time_t
|
||||
#define mbedtls_exit exit
|
||||
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
|
||||
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
|
||||
#endif /* MBEDTLS_PLATFORM_C */
|
||||
|
||||
#if defined(MBEDTLS_AES_C) && defined(MBEDTLS_DHM_C) && \
|
||||
defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_NET_C) && \
|
||||
defined(MBEDTLS_RSA_C) && defined(MBEDTLS_SHA256_C) && \
|
||||
defined(MBEDTLS_FS_IO) && defined(MBEDTLS_CTR_DRBG_C) && \
|
||||
defined(MBEDTLS_SHA1_C)
|
||||
#include "mbedtls/net_sockets.h"
|
||||
#include "mbedtls/aes.h"
|
||||
#include "mbedtls/dhm.h"
|
||||
#include "mbedtls/rsa.h"
|
||||
#include "mbedtls/sha1.h"
|
||||
#include "mbedtls/entropy.h"
|
||||
#include "mbedtls/ctr_drbg.h"
|
||||
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
#endif
|
||||
|
||||
#define SERVER_PORT "11999"
|
||||
#define PLAINTEXT "==Hello there!=="
|
||||
|
||||
#if !defined(MBEDTLS_AES_C) || !defined(MBEDTLS_DHM_C) || \
|
||||
!defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_NET_C) || \
|
||||
!defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_SHA256_C) || \
|
||||
!defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C) || \
|
||||
!defined(MBEDTLS_SHA1_C)
|
||||
int main( void )
|
||||
{
|
||||
mbedtls_printf("MBEDTLS_AES_C and/or MBEDTLS_DHM_C and/or MBEDTLS_ENTROPY_C "
|
||||
"and/or MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
|
||||
"MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO and/or "
|
||||
"MBEDTLS_CTR_DRBG_C not defined.\n");
|
||||
return( 0 );
|
||||
}
|
||||
#else
|
||||
|
||||
#if defined(MBEDTLS_CHECK_PARAMS)
|
||||
#include "mbedtls/platform_util.h"
|
||||
void mbedtls_param_failed( const char *failure_condition,
|
||||
const char *file,
|
||||
int line )
|
||||
{
|
||||
mbedtls_printf( "%s:%i: Input param failed - %s\n",
|
||||
file, line, failure_condition );
|
||||
mbedtls_exit( MBEDTLS_EXIT_FAILURE );
|
||||
}
|
||||
#endif
|
||||
|
||||
int main( void )
|
||||
{
|
||||
FILE *f;
|
||||
|
||||
int ret = 1;
|
||||
int exit_code = MBEDTLS_EXIT_FAILURE;
|
||||
size_t n, buflen;
|
||||
mbedtls_net_context listen_fd, client_fd;
|
||||
|
||||
unsigned char buf[2048];
|
||||
unsigned char hash[32];
|
||||
unsigned char buf2[2];
|
||||
const char *pers = "dh_server";
|
||||
|
||||
mbedtls_entropy_context entropy;
|
||||
mbedtls_ctr_drbg_context ctr_drbg;
|
||||
mbedtls_rsa_context rsa;
|
||||
mbedtls_dhm_context dhm;
|
||||
mbedtls_aes_context aes;
|
||||
|
||||
mbedtls_mpi N, P, Q, D, E;
|
||||
|
||||
mbedtls_net_init( &listen_fd );
|
||||
mbedtls_net_init( &client_fd );
|
||||
mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_SHA256 );
|
||||
mbedtls_dhm_init( &dhm );
|
||||
mbedtls_aes_init( &aes );
|
||||
mbedtls_ctr_drbg_init( &ctr_drbg );
|
||||
|
||||
mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
|
||||
mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E );
|
||||
|
||||
/*
|
||||
* 1. Setup the RNG
|
||||
*/
|
||||
mbedtls_printf( "\n . Seeding the random number generator" );
|
||||
fflush( stdout );
|
||||
|
||||
mbedtls_entropy_init( &entropy );
|
||||
if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
|
||||
(const unsigned char *) pers,
|
||||
strlen( pers ) ) ) != 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
/*
|
||||
* 2a. Read the server's private RSA key
|
||||
*/
|
||||
mbedtls_printf( "\n . Reading private key from rsa_priv.txt" );
|
||||
fflush( stdout );
|
||||
|
||||
if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! Could not open rsa_priv.txt\n" \
|
||||
" ! Please run rsa_genkey first\n\n" );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
|
||||
|
||||
if( ( ret = mbedtls_mpi_read_file( &N , 16, f ) ) != 0 ||
|
||||
( ret = mbedtls_mpi_read_file( &E , 16, f ) ) != 0 ||
|
||||
( ret = mbedtls_mpi_read_file( &D , 16, f ) ) != 0 ||
|
||||
( ret = mbedtls_mpi_read_file( &P , 16, f ) ) != 0 ||
|
||||
( ret = mbedtls_mpi_read_file( &Q , 16, f ) ) != 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n",
|
||||
ret );
|
||||
fclose( f );
|
||||
goto exit;
|
||||
}
|
||||
fclose( f );
|
||||
|
||||
if( ( ret = mbedtls_rsa_import( &rsa, &N, &P, &Q, &D, &E ) ) != 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_rsa_import returned %d\n\n",
|
||||
ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
if( ( ret = mbedtls_rsa_complete( &rsa ) ) != 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_rsa_complete returned %d\n\n",
|
||||
ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
/*
|
||||
* 2b. Get the DHM modulus and generator
|
||||
*/
|
||||
mbedtls_printf( "\n . Reading DH parameters from dh_prime.txt" );
|
||||
fflush( stdout );
|
||||
|
||||
if( ( f = fopen( "dh_prime.txt", "rb" ) ) == NULL )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! Could not open dh_prime.txt\n" \
|
||||
" ! Please run dh_genprime first\n\n" );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
if( mbedtls_mpi_read_file( &dhm.P, 16, f ) != 0 ||
|
||||
mbedtls_mpi_read_file( &dhm.G, 16, f ) != 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! Invalid DH parameter file\n\n" );
|
||||
fclose( f );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
fclose( f );
|
||||
|
||||
/*
|
||||
* 3. Wait for a client to connect
|
||||
*/
|
||||
mbedtls_printf( "\n . Waiting for a remote connection" );
|
||||
fflush( stdout );
|
||||
|
||||
if( ( ret = mbedtls_net_bind( &listen_fd, NULL, SERVER_PORT, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_net_bind returned %d\n\n", ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
|
||||
NULL, 0, NULL ) ) != 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_net_accept returned %d\n\n", ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
/*
|
||||
* 4. Setup the DH parameters (P,G,Ys)
|
||||
*/
|
||||
mbedtls_printf( "\n . Sending the server's DH parameters" );
|
||||
fflush( stdout );
|
||||
|
||||
memset( buf, 0, sizeof( buf ) );
|
||||
|
||||
if( ( ret = mbedtls_dhm_make_params( &dhm, (int) mbedtls_mpi_size( &dhm.P ), buf, &n,
|
||||
mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_dhm_make_params returned %d\n\n", ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
/*
|
||||
* 5. Sign the parameters and send them
|
||||
*/
|
||||
if( ( ret = mbedtls_sha1_ret( buf, n, hash ) ) != 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_sha1_ret returned %d\n\n", ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
buf[n ] = (unsigned char)( rsa.len >> 8 );
|
||||
buf[n + 1] = (unsigned char)( rsa.len );
|
||||
|
||||
if( ( ret = mbedtls_rsa_pkcs1_sign( &rsa, NULL, NULL, MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_SHA256,
|
||||
0, hash, buf + n + 2 ) ) != 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_sign returned %d\n\n", ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
buflen = n + 2 + rsa.len;
|
||||
buf2[0] = (unsigned char)( buflen >> 8 );
|
||||
buf2[1] = (unsigned char)( buflen );
|
||||
|
||||
if( ( ret = mbedtls_net_send( &client_fd, buf2, 2 ) ) != 2 ||
|
||||
( ret = mbedtls_net_send( &client_fd, buf, buflen ) ) != (int) buflen )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_net_send returned %d\n\n", ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
/*
|
||||
* 6. Get the client's public value: Yc = G ^ Xc mod P
|
||||
*/
|
||||
mbedtls_printf( "\n . Receiving the client's public value" );
|
||||
fflush( stdout );
|
||||
|
||||
memset( buf, 0, sizeof( buf ) );
|
||||
|
||||
n = dhm.len;
|
||||
if( ( ret = mbedtls_net_recv( &client_fd, buf, n ) ) != (int) n )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_net_recv returned %d\n\n", ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
if( ( ret = mbedtls_dhm_read_public( &dhm, buf, dhm.len ) ) != 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_dhm_read_public returned %d\n\n", ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
/*
|
||||
* 7. Derive the shared secret: K = Ys ^ Xc mod P
|
||||
*/
|
||||
mbedtls_printf( "\n . Shared secret: " );
|
||||
fflush( stdout );
|
||||
|
||||
if( ( ret = mbedtls_dhm_calc_secret( &dhm, buf, sizeof( buf ), &n,
|
||||
mbedtls_ctr_drbg_random, &ctr_drbg ) ) != 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_dhm_calc_secret returned %d\n\n", ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
for( n = 0; n < 16; n++ )
|
||||
mbedtls_printf( "%02x", buf[n] );
|
||||
|
||||
/*
|
||||
* 8. Setup the AES-256 encryption key
|
||||
*
|
||||
* This is an overly simplified example; best practice is
|
||||
* to hash the shared secret with a random value to derive
|
||||
* the keying material for the encryption/decryption keys
|
||||
* and MACs.
|
||||
*/
|
||||
mbedtls_printf( "...\n . Encrypting and sending the ciphertext" );
|
||||
fflush( stdout );
|
||||
|
||||
mbedtls_aes_setkey_enc( &aes, buf, 256 );
|
||||
memcpy( buf, PLAINTEXT, 16 );
|
||||
mbedtls_aes_crypt_ecb( &aes, MBEDTLS_AES_ENCRYPT, buf, buf );
|
||||
|
||||
if( ( ret = mbedtls_net_send( &client_fd, buf, 16 ) ) != 16 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_net_send returned %d\n\n", ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
mbedtls_printf( "\n\n" );
|
||||
|
||||
exit_code = MBEDTLS_EXIT_SUCCESS;
|
||||
|
||||
exit:
|
||||
|
||||
mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
|
||||
mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E );
|
||||
|
||||
mbedtls_net_free( &client_fd );
|
||||
mbedtls_net_free( &listen_fd );
|
||||
|
||||
mbedtls_aes_free( &aes );
|
||||
mbedtls_rsa_free( &rsa );
|
||||
mbedtls_dhm_free( &dhm );
|
||||
mbedtls_ctr_drbg_free( &ctr_drbg );
|
||||
mbedtls_entropy_free( &entropy );
|
||||
|
||||
#if defined(_WIN32)
|
||||
mbedtls_printf( " + Press Enter to exit this program.\n" );
|
||||
fflush( stdout ); getchar();
|
||||
#endif
|
||||
|
||||
return( exit_code );
|
||||
}
|
||||
#endif /* MBEDTLS_AES_C && MBEDTLS_DHM_C && MBEDTLS_ENTROPY_C &&
|
||||
MBEDTLS_NET_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
|
||||
MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
|
||||
Loading…
Add table
Add a link
Reference in a new issue