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mbedtls/programs/ssl/ssl_mail_client.c
Paul Bakker 09c9dd80ef Revert 42cc641. Issue already fixed in 333fdec.
2014-08-18 11:06:56 +02:00

843 lines
24 KiB
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/*
* SSL client for SMTP servers
*
* Copyright (C) 2006-2012, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#if !defined(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
#include <unistd.h>
#else
#include <io.h>
#define read _read
#define write _write
#endif
#if defined(_WIN32) || defined(_WIN32_WCE)
#include <winsock2.h>
#include <windows.h>
#if defined(_MSC_VER)
#if defined(_WIN32_WCE)
#pragma comment( lib, "ws2.lib" )
#else
#pragma comment( lib, "ws2_32.lib" )
#endif
#endif /* _MSC_VER */
#endif
#include "polarssl/base64.h"
#include "polarssl/error.h"
#include "polarssl/net.h"
#include "polarssl/ssl.h"
#include "polarssl/entropy.h"
#include "polarssl/ctr_drbg.h"
#include "polarssl/certs.h"
#include "polarssl/x509.h"
#if !defined(POLARSSL_BIGNUM_C) || !defined(POLARSSL_ENTROPY_C) || \
!defined(POLARSSL_SSL_TLS_C) || !defined(POLARSSL_SSL_CLI_C) || \
!defined(POLARSSL_NET_C) || !defined(POLARSSL_RSA_C) || \
!defined(POLARSSL_CTR_DRBG_C) || !defined(POLARSSL_X509_CRT_PARSE_C)
int main( int argc, char *argv[] )
{
((void) argc);
((void) argv);
printf("POLARSSL_BIGNUM_C and/or POLARSSL_ENTROPY_C and/or "
"POLARSSL_SSL_TLS_C and/or POLARSSL_SSL_CLI_C and/or "
"POLARSSL_NET_C and/or POLARSSL_RSA_C and/or "
"POLARSSL_CTR_DRBG_C and/or POLARSSL_X509_CRT_PARSE_C "
"not defined.\n");
return( 0 );
}
#else
#define DFL_SERVER_NAME "localhost"
#define DFL_SERVER_PORT 465
#define DFL_USER_NAME "user"
#define DFL_USER_PWD "password"
#define DFL_MAIL_FROM ""
#define DFL_MAIL_TO ""
#define DFL_DEBUG_LEVEL 0
#define DFL_CA_FILE ""
#define DFL_CRT_FILE ""
#define DFL_KEY_FILE ""
#define DFL_FORCE_CIPHER 0
#define DFL_MODE 0
#define DFL_AUTHENTICATION 0
#define MODE_SSL_TLS 0
#define MODE_STARTTLS 0
/*
* global options
*/
struct options
{
const char *server_name; /* hostname of the server (client only) */
int server_port; /* port on which the ssl service runs */
int debug_level; /* level of debugging */
int authentication; /* if authentication is required */
int mode; /* SSL/TLS (0) or STARTTLS (1) */
const char *user_name; /* username to use for authentication */
const char *user_pwd; /* password to use for authentication */
const char *mail_from; /* E-Mail address to use as sender */
const char *mail_to; /* E-Mail address to use as recipient */
const char *ca_file; /* the file with the CA certificate(s) */
const char *crt_file; /* the file with the client certificate */
const char *key_file; /* the file with the client key */
int force_ciphersuite[2]; /* protocol/ciphersuite to use, or all */
} opt;
static void my_debug( void *ctx, int level, const char *str )
{
if( level < opt.debug_level )
{
fprintf( (FILE *) ctx, "%s", str );
fflush( (FILE *) ctx );
}
}
static int do_handshake( ssl_context *ssl, struct options *opt )
{
int ret;
unsigned char buf[1024];
memset(buf, 0, 1024);
/*
* 4. Handshake
*/
printf( " . Performing the SSL/TLS handshake..." );
fflush( stdout );
while( ( ret = ssl_handshake( ssl ) ) != 0 )
{
if( ret != POLARSSL_ERR_NET_WANT_READ && ret != POLARSSL_ERR_NET_WANT_WRITE )
{
#if defined(POLARSSL_ERROR_C)
polarssl_strerror( ret, (char *) buf, 1024 );
#endif
printf( " failed\n ! ssl_handshake returned %d: %s\n\n", ret, buf );
return( -1 );
}
}
printf( " ok\n [ Ciphersuite is %s ]\n",
ssl_get_ciphersuite( ssl ) );
/*
* 5. Verify the server certificate
*/
printf( " . Verifying peer X.509 certificate..." );
/* In real life, we may want to bail out when ret != 0 */
if( ( ret = ssl_get_verify_result( ssl ) ) != 0 )
{
printf( " failed\n" );
if( ( ret & BADCERT_EXPIRED ) != 0 )
printf( " ! server certificate has expired\n" );
if( ( ret & BADCERT_REVOKED ) != 0 )
printf( " ! server certificate has been revoked\n" );
if( ( ret & BADCERT_CN_MISMATCH ) != 0 )
printf( " ! CN mismatch (expected CN=%s)\n", opt->server_name );
if( ( ret & BADCERT_NOT_TRUSTED ) != 0 )
printf( " ! self-signed or not signed by a trusted CA\n" );
printf( "\n" );
}
else
printf( " ok\n" );
printf( " . Peer certificate information ...\n" );
x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
ssl_get_peer_cert( ssl ) );
printf( "%s\n", buf );
return( 0 );
}
static int write_ssl_data( ssl_context *ssl, unsigned char *buf, size_t len )
{
int ret;
printf("\n%s", buf);
while( len && ( ret = ssl_write( ssl, buf, len ) ) <= 0 )
{
if( ret != POLARSSL_ERR_NET_WANT_READ && ret != POLARSSL_ERR_NET_WANT_WRITE )
{
printf( " failed\n ! ssl_write returned %d\n\n", ret );
return -1;
}
}
return( 0 );
}
static int write_ssl_and_get_response( ssl_context *ssl, unsigned char *buf, size_t len )
{
int ret;
unsigned char data[128];
char code[4];
size_t i, idx = 0;
printf("\n%s", buf);
while( len && ( ret = ssl_write( ssl, buf, len ) ) <= 0 )
{
if( ret != POLARSSL_ERR_NET_WANT_READ && ret != POLARSSL_ERR_NET_WANT_WRITE )
{
printf( " failed\n ! ssl_write returned %d\n\n", ret );
return -1;
}
}
do
{
len = sizeof( data ) - 1;
memset( data, 0, sizeof( data ) );
ret = ssl_read( ssl, data, len );
if( ret == POLARSSL_ERR_NET_WANT_READ || ret == POLARSSL_ERR_NET_WANT_WRITE )
continue;
if( ret == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY )
return -1;
if( ret <= 0 )
{
printf( "failed\n ! ssl_read returned %d\n\n", ret );
return -1;
}
printf("\n%s", data);
len = ret;
for( i = 0; i < len; i++ )
{
if( data[i] != '\n' )
{
if( idx < 4 )
code[ idx++ ] = data[i];
continue;
}
if( idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ' )
{
code[3] = '\0';
return atoi( code );
}
idx = 0;
}
}
while( 1 );
}
static int write_and_get_response( int sock_fd, unsigned char *buf, size_t len )
{
int ret;
unsigned char data[128];
char code[4];
size_t i, idx = 0;
printf("\n%s", buf);
if( len && ( ret = write( sock_fd, buf, len ) ) <= 0 )
{
printf( " failed\n ! ssl_write returned %d\n\n", ret );
return -1;
}
do
{
len = sizeof( data ) - 1;
memset( data, 0, sizeof( data ) );
ret = read( sock_fd, data, len );
if( ret <= 0 )
{
printf( "failed\n ! read returned %d\n\n", ret );
return -1;
}
data[len] = '\0';
printf("\n%s", data);
len = ret;
for( i = 0; i < len; i++ )
{
if( data[i] != '\n' )
{
if( idx < 4 )
code[ idx++ ] = data[i];
continue;
}
if( idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ' )
{
code[3] = '\0';
return atoi( code );
}
idx = 0;
}
}
while( 1 );
}
#if defined(POLARSSL_BASE64_C)
#define USAGE_AUTH \
" authentication=%%d default: 0 (disabled)\n" \
" user_name=%%s default: \"user\"\n" \
" user_pwd=%%s default: \"password\"\n"
#else
#define USAGE_AUTH \
" authentication options disabled. (Require POLARSSL_BASE64_C)\n"
#endif /* POLARSSL_BASE64_C */
#if defined(POLARSSL_FS_IO)
#define USAGE_IO \
" ca_file=%%s default: \"\" (pre-loaded)\n" \
" crt_file=%%s default: \"\" (pre-loaded)\n" \
" key_file=%%s default: \"\" (pre-loaded)\n"
#else
#define USAGE_IO \
" No file operations available (POLARSSL_FS_IO not defined)\n"
#endif /* POLARSSL_FS_IO */
#define USAGE \
"\n usage: ssl_mail_client param=<>...\n" \
"\n acceptable parameters:\n" \
" server_name=%%s default: localhost\n" \
" server_port=%%d default: 4433\n" \
" debug_level=%%d default: 0 (disabled)\n" \
" mode=%%d default: 0 (SSL/TLS) (1 for STARTTLS)\n" \
USAGE_AUTH \
" mail_from=%%s default: \"\"\n" \
" mail_to=%%s default: \"\"\n" \
USAGE_IO \
" force_ciphersuite=<name> default: all enabled\n"\
" acceptable ciphersuite names:\n"
int main( int argc, char *argv[] )
{
int ret = 0, len, server_fd;
unsigned char buf[1024];
#if defined(POLARSSL_BASE64_C)
unsigned char base[1024];
#endif
char hostname[32];
const char *pers = "ssl_mail_client";
entropy_context entropy;
ctr_drbg_context ctr_drbg;
ssl_context ssl;
x509_crt cacert;
x509_crt clicert;
pk_context pkey;
int i;
size_t n;
char *p, *q;
const int *list;
/*
* Make sure memory references are valid in case we exit early.
*/
server_fd = 0;
memset( &ssl, 0, sizeof( ssl_context ) );
memset( &buf, 0, sizeof( buf ) );
x509_crt_init( &cacert );
x509_crt_init( &clicert );
pk_init( &pkey );
if( argc == 0 )
{
usage:
printf( USAGE );
list = ssl_list_ciphersuites();
while( *list )
{
printf(" %s\n", ssl_get_ciphersuite_name( *list ) );
list++;
}
printf("\n");
goto exit;
}
opt.server_name = DFL_SERVER_NAME;
opt.server_port = DFL_SERVER_PORT;
opt.debug_level = DFL_DEBUG_LEVEL;
opt.authentication = DFL_AUTHENTICATION;
opt.mode = DFL_MODE;
opt.user_name = DFL_USER_NAME;
opt.user_pwd = DFL_USER_PWD;
opt.mail_from = DFL_MAIL_FROM;
opt.mail_to = DFL_MAIL_TO;
opt.ca_file = DFL_CA_FILE;
opt.crt_file = DFL_CRT_FILE;
opt.key_file = DFL_KEY_FILE;
opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;
for( i = 1; i < argc; i++ )
{
p = argv[i];
if( ( q = strchr( p, '=' ) ) == NULL )
goto usage;
*q++ = '\0';
if( strcmp( p, "server_name" ) == 0 )
opt.server_name = q;
else if( strcmp( p, "server_port" ) == 0 )
{
opt.server_port = atoi( q );
if( opt.server_port < 1 || opt.server_port > 65535 )
goto usage;
}
else if( strcmp( p, "debug_level" ) == 0 )
{
opt.debug_level = atoi( q );
if( opt.debug_level < 0 || opt.debug_level > 65535 )
goto usage;
}
else if( strcmp( p, "authentication" ) == 0 )
{
opt.authentication = atoi( q );
if( opt.authentication < 0 || opt.authentication > 1 )
goto usage;
}
else if( strcmp( p, "mode" ) == 0 )
{
opt.mode = atoi( q );
if( opt.mode < 0 || opt.mode > 1 )
goto usage;
}
else if( strcmp( p, "user_name" ) == 0 )
opt.user_name = q;
else if( strcmp( p, "user_pwd" ) == 0 )
opt.user_pwd = q;
else if( strcmp( p, "mail_from" ) == 0 )
opt.mail_from = q;
else if( strcmp( p, "mail_to" ) == 0 )
opt.mail_to = q;
else if( strcmp( p, "ca_file" ) == 0 )
opt.ca_file = q;
else if( strcmp( p, "crt_file" ) == 0 )
opt.crt_file = q;
else if( strcmp( p, "key_file" ) == 0 )
opt.key_file = q;
else if( strcmp( p, "force_ciphersuite" ) == 0 )
{
opt.force_ciphersuite[0] = -1;
opt.force_ciphersuite[0] = ssl_get_ciphersuite_id( q );
if( opt.force_ciphersuite[0] <= 0 )
goto usage;
opt.force_ciphersuite[1] = 0;
}
else
goto usage;
}
/*
* 0. Initialize the RNG and the session data
*/
printf( "\n . Seeding the random number generator..." );
fflush( stdout );
entropy_init( &entropy );
if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 )
{
printf( " failed\n ! ctr_drbg_init returned %d\n", ret );
goto exit;
}
printf( " ok\n" );
/*
* 1.1. Load the trusted CA
*/
printf( " . Loading the CA root certificate ..." );
fflush( stdout );
#if defined(POLARSSL_FS_IO)
if( strlen( opt.ca_file ) )
ret = x509_crt_parse_file( &cacert, opt.ca_file );
else
#endif
#if defined(POLARSSL_CERTS_C)
ret = x509_crt_parse( &cacert, (const unsigned char *) test_ca_list,
strlen( test_ca_list ) );
#else
{
ret = 1;
printf("POLARSSL_CERTS_C not defined.");
}
#endif
if( ret < 0 )
{
printf( " failed\n ! x509_crt_parse returned %d\n\n", ret );
goto exit;
}
printf( " ok (%d skipped)\n", ret );
/*
* 1.2. Load own certificate and private key
*
* (can be skipped if client authentication is not required)
*/
printf( " . Loading the client cert. and key..." );
fflush( stdout );
#if defined(POLARSSL_FS_IO)
if( strlen( opt.crt_file ) )
ret = x509_crt_parse_file( &clicert, opt.crt_file );
else
#endif
#if defined(POLARSSL_CERTS_C)
ret = x509_crt_parse( &clicert, (const unsigned char *) test_cli_crt,
strlen( test_cli_crt ) );
#else
{
ret = -1;
printf("POLARSSL_CERTS_C not defined.");
}
#endif
if( ret != 0 )
{
printf( " failed\n ! x509_crt_parse returned %d\n\n", ret );
goto exit;
}
#if defined(POLARSSL_FS_IO)
if( strlen( opt.key_file ) )
ret = pk_parse_keyfile( &pkey, opt.key_file, "" );
else
#endif
#if defined(POLARSSL_CERTS_C)
ret = pk_parse_key( &pkey, (const unsigned char *) test_cli_key,
strlen( test_cli_key ), NULL, 0 );
#else
{
ret = -1;
printf("POLARSSL_CERTS_C not defined.");
}
#endif
if( ret != 0 )
{
printf( " failed\n ! pk_parse_key returned %d\n\n", ret );
goto exit;
}
printf( " ok\n" );
/*
* 2. Start the connection
*/
printf( " . Connecting to tcp/%s/%-4d...", opt.server_name,
opt.server_port );
fflush( stdout );
if( ( ret = net_connect( &server_fd, opt.server_name,
opt.server_port ) ) != 0 )
{
printf( " failed\n ! net_connect returned %d\n\n", ret );
goto exit;
}
printf( " ok\n" );
/*
* 3. Setup stuff
*/
printf( " . Setting up the SSL/TLS structure..." );
fflush( stdout );
if( ( ret = ssl_init( &ssl ) ) != 0 )
{
printf( " failed\n ! ssl_init returned %d\n\n", ret );
goto exit;
}
printf( " ok\n" );
ssl_set_endpoint( &ssl, SSL_IS_CLIENT );
/* OPTIONAL is not optimal for security,
* but makes interop easier in this simplified example */
ssl_set_authmode( &ssl, SSL_VERIFY_OPTIONAL );
ssl_set_rng( &ssl, ctr_drbg_random, &ctr_drbg );
ssl_set_dbg( &ssl, my_debug, stdout );
ssl_set_bio( &ssl, net_recv, &server_fd,
net_send, &server_fd );
if( opt.force_ciphersuite[0] != DFL_FORCE_CIPHER )
ssl_set_ciphersuites( &ssl, opt.force_ciphersuite );
ssl_set_ca_chain( &ssl, &cacert, NULL, opt.server_name );
if( ( ret = ssl_set_own_cert( &ssl, &clicert, &pkey ) ) != 0 )
{
printf( " failed\n ! ssl_set_own_cert returned %d\n\n", ret );
goto exit;
}
#if defined(POLARSSL_SSL_SERVER_NAME_INDICATION)
if( ( ret = ssl_set_hostname( &ssl, opt.server_name ) ) != 0 )
{
printf( " failed\n ! ssl_set_hostname returned %d\n\n", ret );
goto exit;
}
#endif
if( opt.mode == MODE_SSL_TLS )
{
if( do_handshake( &ssl, &opt ) != 0 )
goto exit;
printf( " > Get header from server:" );
fflush( stdout );
ret = write_ssl_and_get_response( &ssl, buf, 0 );
if( ret < 200 || ret > 299 )
{
printf( " failed\n ! server responded with %d\n\n", ret );
goto exit;
}
printf(" ok\n" );
printf( " > Write EHLO to server:" );
fflush( stdout );
gethostname( hostname, 32 );
len = sprintf( (char *) buf, "EHLO %s\r\n", hostname );
ret = write_ssl_and_get_response( &ssl, buf, len );
if( ret < 200 || ret > 299 )
{
printf( " failed\n ! server responded with %d\n\n", ret );
goto exit;
}
}
else
{
printf( " > Get header from server:" );
fflush( stdout );
ret = write_and_get_response( server_fd, buf, 0 );
if( ret < 200 || ret > 299 )
{
printf( " failed\n ! server responded with %d\n\n", ret );
goto exit;
}
printf(" ok\n" );
printf( " > Write EHLO to server:" );
fflush( stdout );
gethostname( hostname, 32 );
len = sprintf( (char *) buf, "EHLO %s\r\n", hostname );
ret = write_and_get_response( server_fd, buf, len );
if( ret < 200 || ret > 299 )
{
printf( " failed\n ! server responded with %d\n\n", ret );
goto exit;
}
printf(" ok\n" );
printf( " > Write STARTTLS to server:" );
fflush( stdout );
gethostname( hostname, 32 );
len = sprintf( (char *) buf, "STARTTLS\r\n" );
ret = write_and_get_response( server_fd, buf, len );
if( ret < 200 || ret > 299 )
{
printf( " failed\n ! server responded with %d\n\n", ret );
goto exit;
}
printf(" ok\n" );
if( do_handshake( &ssl, &opt ) != 0 )
goto exit;
}
#if defined(POLARSSL_BASE64_C)
if( opt.authentication )
{
printf( " > Write AUTH LOGIN to server:" );
fflush( stdout );
len = sprintf( (char *) buf, "AUTH LOGIN\r\n" );
ret = write_ssl_and_get_response( &ssl, buf, len );
if( ret < 200 || ret > 399 )
{
printf( " failed\n ! server responded with %d\n\n", ret );
goto exit;
}
printf(" ok\n" );
printf( " > Write username to server: %s", opt.user_name );
fflush( stdout );
n = sizeof( buf );
ret = base64_encode( base, &n, (const unsigned char *) opt.user_name,
strlen( opt.user_name ) );
if( ret != 0 ) {
printf( " failed\n ! base64_encode returned %d\n\n", ret );
goto exit;
}
len = sprintf( (char *) buf, "%s\r\n", base );
ret = write_ssl_and_get_response( &ssl, buf, len );
if( ret < 300 || ret > 399 )
{
printf( " failed\n ! server responded with %d\n\n", ret );
goto exit;
}
printf(" ok\n" );
printf( " > Write password to server: %s", opt.user_pwd );
fflush( stdout );
ret = base64_encode( base, &n, (const unsigned char *) opt.user_pwd,
strlen( opt.user_pwd ) );
if( ret != 0 ) {
printf( " failed\n ! base64_encode returned %d\n\n", ret );
goto exit;
}
len = sprintf( (char *) buf, "%s\r\n", base );
ret = write_ssl_and_get_response( &ssl, buf, len );
if( ret < 200 || ret > 399 )
{
printf( " failed\n ! server responded with %d\n\n", ret );
goto exit;
}
printf(" ok\n" );
}
#endif
printf( " > Write MAIL FROM to server:" );
fflush( stdout );
len = sprintf( (char *) buf, "MAIL FROM:<%s>\r\n", opt.mail_from );
ret = write_ssl_and_get_response( &ssl, buf, len );
if( ret < 200 || ret > 299 )
{
printf( " failed\n ! server responded with %d\n\n", ret );
goto exit;
}
printf(" ok\n" );
printf( " > Write RCPT TO to server:" );
fflush( stdout );
len = sprintf( (char *) buf, "RCPT TO:<%s>\r\n", opt.mail_to );
ret = write_ssl_and_get_response( &ssl, buf, len );
if( ret < 200 || ret > 299 )
{
printf( " failed\n ! server responded with %d\n\n", ret );
goto exit;
}
printf(" ok\n" );
printf( " > Write DATA to server:" );
fflush( stdout );
len = sprintf( (char *) buf, "DATA\r\n" );
ret = write_ssl_and_get_response( &ssl, buf, len );
if( ret < 300 || ret > 399 )
{
printf( " failed\n ! server responded with %d\n\n", ret );
goto exit;
}
printf(" ok\n" );
printf( " > Write content to server:" );
fflush( stdout );
len = sprintf( (char *) buf, "From: %s\r\nSubject: PolarSSL Test mail\r\n\r\n"
"This is a simple test mail from the "
"PolarSSL mail client example.\r\n"
"\r\n"
"Enjoy!", opt.mail_from );
ret = write_ssl_data( &ssl, buf, len );
len = sprintf( (char *) buf, "\r\n.\r\n");
ret = write_ssl_and_get_response( &ssl, buf, len );
if( ret < 200 || ret > 299 )
{
printf( " failed\n ! server responded with %d\n\n", ret );
goto exit;
}
printf(" ok\n" );
ssl_close_notify( &ssl );
exit:
if( server_fd )
net_close( server_fd );
x509_crt_free( &clicert );
x509_crt_free( &cacert );
pk_free( &pkey );
ssl_free( &ssl );
ctr_drbg_free( &ctr_drbg );
entropy_free( &entropy );
#if defined(_WIN32)
printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( ret );
}
#endif /* POLARSSL_BIGNUM_C && POLARSSL_ENTROPY_C && POLARSSL_SSL_TLS_C &&
POLARSSL_SSL_CLI_C && POLARSSL_NET_C && POLARSSL_RSA_C **
POLARSSL_CTR_DRBG_C */
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