SSL reproducible test mode
diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index 1e63ee5..58c4020 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -131,6 +131,7 @@
#define DFL_ETM -1
#define DFL_CA_CALLBACK 0
#define DFL_EAP_TLS 0
+#define DFL_REPRODUCIBLE 0
#define GET_REQUEST "GET %s HTTP/1.0\r\nExtra-header: "
#define GET_REQUEST_END "\r\n\r\n"
@@ -482,6 +483,7 @@
const char *cid_val; /* the CID to use for incoming messages */
const char *cid_val_renego; /* the CID to use for incoming messages
* after renegotiation */
+ int reproducible; /* make communication reproducible */
} opt;
int query_config( const char *config );
@@ -538,6 +540,42 @@
fflush( (FILE *) ctx );
}
+
+mbedtls_time_t dummy_constant_time( mbedtls_time_t* time )
+{
+ (void) time;
+ return 0x5af2a056;
+}
+
+int dummy_random( void *p_rng, unsigned char *output, size_t output_len )
+{
+ int ret;
+ size_t i;
+
+ //use mbedtls_ctr_drbg_random to find bugs in it
+ ret = mbedtls_ctr_drbg_random(p_rng, output, output_len);
+ for (i=0; i<output_len; i++) {
+ //replace result with pseudo random
+ output[i] = (unsigned char) rand();
+ }
+ return( ret );
+}
+
+int dummy_entropy( void *data, unsigned char *output, size_t len )
+{
+ size_t i;
+ (void) data;
+
+ //use mbedtls_entropy_func to find bugs in it
+ //test performance impact of entropy
+ //ret = mbedtls_entropy_func(data, output, len);
+ for (i=0; i<len; i++) {
+ //replace result with pseudo random
+ output[i] = (unsigned char) rand();
+ }
+ return( 0 );
+}
+
#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
int ca_callback( void *data, mbedtls_x509_crt const *child,
mbedtls_x509_crt **candidates )
@@ -1025,6 +1063,7 @@
opt.etm = DFL_ETM;
opt.dgram_packing = DFL_DGRAM_PACKING;
opt.eap_tls = DFL_EAP_TLS;
+ opt.reproducible = DFL_REPRODUCIBLE;
for( i = 1; i < argc; i++ )
{
@@ -1411,6 +1450,10 @@
if( opt.eap_tls < 0 || opt.eap_tls > 1 )
goto usage;
}
+ else if( strcmp( p, "reproducible" ) == 0 )
+ {
+ opt.reproducible = 1;
+ }
else
goto usage;
}
@@ -1663,13 +1706,24 @@
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 -0x%x\n",
- -ret );
- goto exit;
+ if (opt.reproducible) {
+ if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, dummy_entropy,
+ &entropy, (const unsigned char *) pers,
+ strlen( pers ) ) ) != 0 )
+ {
+ mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned -0x%x\n",
+ -ret );
+ goto exit;
+ }
+ } else {
+ 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 -0x%x\n",
+ -ret );
+ goto exit;
+ }
}
mbedtls_printf( " ok\n" );
@@ -1949,7 +2003,17 @@
}
#endif
- mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+ if (opt.reproducible) {
+ srand(1);
+ mbedtls_ssl_conf_rng( &conf, dummy_random, &ctr_drbg );
+#if defined(MBEDTLS_PLATFORM_TIME_ALT)
+ mbedtls_platform_set_time( dummy_constant_time );
+#else
+ fprintf(stderr, "Warning: reprpduce without constant time\n");
+#endif
+ } else {
+ mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+ }
mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
mbedtls_ssl_conf_read_timeout( &conf, opt.read_timeout );
