From: Nick Mathewson <nickm@torproject.org>
Date: Fri, 13 Jun 2003 21:23:14 +0000 (+0000)
Subject: Better test messages for onion skin bug
X-Git-Tag: tor-0.0.2pre8~149
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=6250b90ac211a67bb7e36c9911f31b06154bb7df;p=thirdparty%2Ftor.git

Better test messages for onion skin bug


svn:r319
---

diff --git a/src/or/onion.c b/src/or/onion.c
index 77bc624dd8..cf4fae5315 100644
--- a/src/or/onion.c
+++ b/src/or/onion.c
@@ -418,14 +418,19 @@ onion_skin_create(crypto_pk_env_t *dest_router_key,
   if (crypto_dh_get_public(dh, pubkey+16, dhbytes))
     goto err;
 
-#if 0
-  printf("Client DH sent: %x %x %x ... %x %x %x\n",
-         (int) pubkey[16], (int) pubkey[17], (int) pubkey[18], 
-         (int) pubkey[205], (int) pubkey[206], (int) pubkey[207]);
-
-  printf("Client key sent: %x %x %x ... %x %x %x\n",
-         pubkey[0],pubkey[1],pubkey[2], 
-         pubkey[13],pubkey[14],pubkey[15]);
+#ifdef DEBUG_ONION_SKINS
+#define PA(a,n) \
+  { int _i; for (_i = 0; _i<n; ++_i) printf("%02x ",((int)(a)[_i])&0xFF); }
+
+  printf("Client: client g^x:");
+  PA(pubkey+16,3);
+  printf("...");
+  PA(pubkey+141,3);
+  puts("");
+
+  printf("Client: client symkey:");
+  PA(pubkey+0,16);
+  puts("");
 #endif
 
   cipher = crypto_create_init_cipher(CRYPTO_CIPHER_3DES, pubkey, iv, 1);
@@ -478,9 +483,10 @@ onion_skin_server_handshake(char *onion_skin, /* DH_ONIONSKIN_LEN bytes long */
                                 buf, RSA_NO_PADDING) == -1)
     goto err;
   
-#if 0
-  printf("Client key got: %x %x %x ... %x %x %x\n",
-         buf[0],buf[1],buf[2], buf[13],buf[14],buf[15]);
+#ifdef DEBUG_ONION_SKINS
+  printf("Server: client symkey:");
+  PA(buf+0,16);
+  puts("");
 #endif
 
   cipher = crypto_create_init_cipher(CRYPTO_CIPHER_3DES, buf, iv, 0);
@@ -489,21 +495,37 @@ onion_skin_server_handshake(char *onion_skin, /* DH_ONIONSKIN_LEN bytes long */
                             buf+pkbytes))
     goto err;
 
-#if 0
-  printf("Client DH got: %x %x %x ... %x %x %x\n",
-         (int) buf[16], (int) buf[17], (int) buf[18], 
-         (int) buf[205], (int) buf[206], (int) buf[207]);
+#ifdef DEBUG_ONION_SKINS
+  printf("Server: client g^x:");
+  PA(buf+16,3);
+  printf("...");
+  PA(buf+141,3);
+  puts("");
 #endif
   
   dh = crypto_dh_new();
   if (crypto_dh_get_public(dh, handshake_reply_out, DH_KEY_LEN))
     goto err;
 
+#ifdef DEBUG_ONION_SKINS
+  printf("Server: server g^y:");
+  PA(handshake_reply_out+0,3);
+  printf("...");
+  PA(handshake_reply_out+125,3);
+  puts("");
+#endif
+
   if (crypto_dh_compute_secret(dh, buf+16, DH_KEY_LEN, buf))
     goto err;
 
   memcpy(key_out, buf+DH_KEY_LEN-key_out_len, key_out_len);
 
+#ifdef DEBUG_ONION_SKINS
+  printf("Server: keys out:");
+  PA(key_out, key_out_len);
+  puts("");
+#endif
+
   crypto_free_cipher_env(cipher);
   crypto_dh_free(dh);
   return 0;
@@ -532,12 +554,26 @@ onion_skin_client_handshake(crypto_dh_env_t *handshake_state,
   
   memset(key_material, 0, DH_KEY_LEN);
 
+#ifdef DEBUG_ONION_SKINS
+  printf("Client: server g^y:");
+  PA(handshake_reply+0,3);
+  printf("...");
+  PA(handshake_reply+125,3);
+  puts("");
+#endif
+
   if (crypto_dh_compute_secret(handshake_state, handshake_reply, DH_KEY_LEN,
                                key_material))
     return -1;
   
   memcpy(key_out, key_material+DH_KEY_LEN-key_out_len, key_out_len);
 
+#ifdef DEBUG_ONION_SKINS
+  printf("Client: keys out:");
+  PA(key_out, key_out_len);
+  puts("");
+#endif
+
   return 0;
 }
 
diff --git a/src/or/test.c b/src/or/test.c
index bde058ffdc..65fc8a08eb 100644
--- a/src/or/test.c
+++ b/src/or/test.c
@@ -208,6 +208,12 @@ test_crypto()
   data3 = tor_malloc(1024);
   test_assert(data1 && data2 && data3);
 
+  /* Try out RNG. */
+  crypto_seed_rng();
+  crypto_rand(100, data1);
+  crypto_rand(100, data2);
+  test_memneq(data1,data2,100);
+  
   /* Try out identity ciphers. */
   env1 = crypto_new_cipher_env(CRYPTO_CIPHER_IDENTITY);
   test_neq(env1, 0);
@@ -415,7 +421,7 @@ test_onion_handshake() {
   /* server-side */
   char s_buf[DH_KEY_LEN];
   char s_keys[40];
-
+  
   /* shared */
   crypto_pk_env_t *pk = NULL;
 
@@ -436,12 +442,16 @@ test_onion_handshake() {
   test_assert(! onion_skin_client_handshake(c_dh, s_buf, c_keys, 40));
   
   crypto_dh_free(c_dh);
-  crypto_free_pk_env(pk);
 
   /* FIXME sometimes (infrequently) the following fails! Why? */
+  if (memcmp(c_keys, s_keys, 40)) {
+    puts("Aiiiie");
+    exit(1);
+  }
   test_memeq(c_keys, s_keys, 40);
   memset(s_buf, 0, 40);
   test_memneq(c_keys, s_buf, 40);
+  crypto_free_pk_env(pk);
 }
 
 /* from main.c */
@@ -584,15 +594,25 @@ main(int c, char**v) {
   log(LOG_ERR,NULL);         /* make logging quieter */
 
   setup_directory();
+#ifndef DEBUG_ONION_SKINS
   puts("========================== Buffers =========================");
   test_buffers();
   puts("========================== Crypto ==========================");
-  test_crypto_dh();
   test_crypto();
+  test_crypto_dh();
   puts("\n========================= Util ============================");
   test_util();
   puts("\n========================= Onion Skins =====================");
-  test_onion_handshake();
+#endif
+#ifdef DEBUG_ONION_SKINS
+  crypto_seed_rng();
+  while(1) {
+#endif
+    test_onion_handshake();
+#ifdef DEBUG_ONION_SKINS
+    fflush(NULL);
+  }
+#endif
   puts("\n========================= Directory Formats ===============");
   test_dir_format();
   puts("");