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[GNUnet-SVN] [gnunet] 09/18: Bidirectional implementation finished, more


From: gnunet
Subject: [GNUnet-SVN] [gnunet] 09/18: Bidirectional implementation finished, more complex tests for bidirectional, cleanup fix, todos done:
Date: Mon, 07 Oct 2019 12:31:05 +0200

This is an automated email from the git hooks/post-receive script.

martin-schanzenbach pushed a commit to branch master
in repository gnunet.

commit 6ad2e1f1dce42e5c998425e80f48d512638e278e
Author: Andreas Ebner <address@hidden>
AuthorDate: Sun Aug 18 13:46:05 2019 +0200

    Bidirectional implementation finished, more complex tests for 
bidirectional, cleanup fix, todos done:
    
    - fixed cleanup to not cause errors and uncommented it again
    - added new tests for AND, linked roles and fw/bw
    - fixed an older bug to make test ..own_and2.sh work
    - replaced bidirectional matching of bw with unresolved_attribute.. 
(because it contains all the subject attributes/roles)
    - introduced extra function for bidirectional match handling (is the same 
for bw and fw and pretty long)
    - commandline: if not specified to use bw or fw search -> assume it's 
bidirectional
    - moved the bidirecitonal matching list to vrh and removed it from being 
global
    - valgrind on service (one error remaining, to be solved in future commits)
    - use the vrh->dsq_head/tail for the cleanup stuff
---
 src/credential/gnunet-credential.c                 |  30 +-
 src/credential/gnunet-service-credential.c         | 368 ++++++++++++---------
 ..._credential_bi.sh => test_credential_bi_and.sh} |  15 +-
 ...credential_bi.sh => test_credential_bi_and2.sh} |  18 +-
 ...t_credential_bi.sh => test_credential_bi_bw.sh} |   0
 ...dential_bi.sh => test_credential_bi_bw_link.sh} |   7 +-
 ...ential_bi.sh => test_credential_bi_bw_link2.sh} |  10 +-
 ...t_credential_bi.sh => test_credential_bi_fw.sh} |  17 +-
 ...redential_bi.sh => test_credential_own_and2.sh} |  28 +-
 9 files changed, 287 insertions(+), 206 deletions(-)

diff --git a/src/credential/gnunet-credential.c 
b/src/credential/gnunet-credential.c
index 5cc1a791e..f2d967eea 100644
--- a/src/credential/gnunet-credential.c
+++ b/src/credential/gnunet-credential.c
@@ -769,12 +769,9 @@ run (void *cls,
 
   if (GNUNET_NO == forward && GNUNET_NO == backward)
   {
-    fprintf (
-      stderr,
-      _ (
-        "You must state which search direction: '--forward' or 
'--backward'\n"));
-    GNUNET_SCHEDULER_shutdown ();
-    return;
+    // set default: bidirectional
+    forward = GNUNET_YES;
+    backward = GNUNET_YES;
   }
   if (GNUNET_YES == forward)
     direction |= GNUNET_CREDENTIAL_FLAG_FORWARD;
@@ -834,15 +831,6 @@ run (void *cls,
 
   if (GNUNET_YES == verify)
   {
-    if (GNUNET_NO == forward && GNUNET_NO == backward)
-    {
-      fprintf (
-        stderr,
-        _ (
-          "You must state which search direction: '-forward' or 
'backward'\n"));
-      GNUNET_SCHEDULER_shutdown ();
-      return;
-    }
     if (NULL == issuer_key)
     {
       fprintf (stderr, _ ("Issuer public key not well-formed\n"));
@@ -973,12 +961,12 @@ main (int argc, char *const *argv)
                                   "EGO",
                                   gettext_noop ("The ego/zone name to use"),
                                   &ego_name),
-       GNUNET_GETOPT_option_string (
-         'a',
-         "attribute",
-         "ATTR",
-         gettext_noop ("The issuer attribute to verify against or to issue"),
-         &issuer_attr),
+     GNUNET_GETOPT_option_string (
+       'a',
+       "attribute",
+       "ATTR",
+       gettext_noop ("The issuer attribute to verify against or to issue"),
+       &issuer_attr),
      GNUNET_GETOPT_option_string ('T',
                                   "ttl",
                                   "EXP",
diff --git a/src/credential/gnunet-service-credential.c 
b/src/credential/gnunet-service-credential.c
index 9de16bf72..ee02042c8 100644
--- a/src/credential/gnunet-service-credential.c
+++ b/src/credential/gnunet-service-credential.c
@@ -292,6 +292,16 @@ struct VerifyRequestHandle
    */
   struct DelegationChainEntry *delegation_chain_tail;
 
+  /**
+   * List for bidirectional matching
+   */
+  struct DelegationSetQueueEntry *dsq_head;
+
+  /**
+   * List for bidirectional matching
+   */
+  struct DelegationSetQueueEntry *dsq_tail;
+
   /**
    * Issuer public key
    */
@@ -357,12 +367,12 @@ struct VerifyRequestHandle
 /**
  * Head of the DLL.
  */
-static struct VerifyRequestHandle *vrh_head;
+static struct VerifyRequestHandle *vrh_head = NULL;
 
 /**
  * Tail of the DLL.
  */
-static struct VerifyRequestHandle *vrh_tail;
+static struct VerifyRequestHandle *vrh_tail = NULL;
 
 /**
  * Handle to the statistics service
@@ -374,11 +384,6 @@ static struct GNUNET_STATISTICS_Handle *statistics;
  */
 static struct GNUNET_GNS_Handle *gns;
 
-//TODO vrh dependent
-static struct DelegationSetQueueEntry *dsq_head;
-static struct DelegationSetQueueEntry *dsq_tail;
-
-
 /**
  * Handle to namestore service
  */
@@ -428,6 +433,45 @@ cleanup_delegation_set (struct DelegationSetQueueEntry 
*ds_entry)
   GNUNET_free (ds_entry);
 }
 
+static void
+cleanup_dsq_list (struct VerifyRequestHandle *vrh)
+{
+  struct DelegationSetQueueEntry *ds_entry;
+
+  if (NULL == vrh->dsq_head)
+    return;
+
+  for (ds_entry = vrh->dsq_head; NULL != vrh->dsq_head;
+       ds_entry = vrh->dsq_head)
+  {
+    GNUNET_CONTAINER_DLL_remove (vrh->dsq_head, vrh->dsq_tail, ds_entry);
+    GNUNET_free_non_null (ds_entry->issuer_key);
+    GNUNET_free_non_null (ds_entry->issuer_attribute);
+    GNUNET_free_non_null (ds_entry->attr_trailer);
+    // those fields are only set/used in bw search
+    if (ds_entry->from_bw)
+    {
+      GNUNET_free_non_null (ds_entry->lookup_attribute);
+      GNUNET_free_non_null (ds_entry->unresolved_attribute_delegation);
+    }
+    if (NULL != ds_entry->lookup_request)
+    {
+      GNUNET_GNS_lookup_cancel (ds_entry->lookup_request);
+      ds_entry->lookup_request = NULL;
+    }
+    if (NULL != ds_entry->delegation_chain_entry)
+    {
+      GNUNET_free_non_null (
+        ds_entry->delegation_chain_entry->subject_attribute);
+      GNUNET_free_non_null 
(ds_entry->delegation_chain_entry->issuer_attribute);
+      GNUNET_free (ds_entry->delegation_chain_entry);
+    }
+    //TODO: Free dq_entry, how?
+    //GNUNET_free (ds_entry->parent_queue_entry);
+    GNUNET_free (ds_entry);
+  }
+}
+
 static void
 cleanup_handle (struct VerifyRequestHandle *vrh)
 {
@@ -438,7 +482,8 @@ cleanup_handle (struct VerifyRequestHandle *vrh)
     GNUNET_GNS_lookup_cancel (vrh->lookup_request);
     vrh->lookup_request = NULL;
   }
-  cleanup_delegation_set (vrh->root_set);
+  //cleanup_delegation_set (vrh->root_set);
+  cleanup_dsq_list (vrh);
   GNUNET_free_non_null (vrh->issuer_attribute);
   for (del_entry = vrh->del_chain_head; NULL != vrh->del_chain_head;
        del_entry = vrh->del_chain_head)
@@ -491,7 +536,6 @@ send_lookup_response (struct VerifyRequestHandle *vrh)
   struct DelegationChainResultMessage *rmsg;
   struct DelegationChainEntry *dce;
   struct GNUNET_CREDENTIAL_Delegation dd[vrh->delegation_chain_size];
-  //TODO rename all methods using credential
   struct GNUNET_CREDENTIAL_Delegate dele[vrh->del_chain_size];
   struct DelegateRecordEntry *del;
   struct DelegateRecordEntry *tmp;
@@ -574,7 +618,7 @@ send_lookup_response (struct VerifyRequestHandle *vrh)
   GNUNET_MQ_send (GNUNET_SERVICE_client_get_mq (vrh->client), env);
   GNUNET_CONTAINER_DLL_remove (vrh_head, vrh_tail, vrh);
   //TODO fix cleanup with bidirectional
-  //cleanup_handle (vrh);
+  cleanup_handle (vrh);
 
   GNUNET_STATISTICS_update (statistics,
                             "Completed verifications",
@@ -638,6 +682,84 @@ partial_match (char *tmp_trail,
   return attr_trailer;
 }
 
+static void
+print_deleset (struct DelegationSetQueueEntry *dsentry, char *text)
+{
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "%s %s.%s <- %s.%s\n",
+              text,
+              GNUNET_CRYPTO_ecdsa_public_key_to_string (
+                &dsentry->delegation_chain_entry->issuer_key),
+              dsentry->delegation_chain_entry->issuer_attribute,
+              GNUNET_CRYPTO_ecdsa_public_key_to_string (
+                &dsentry->delegation_chain_entry->subject_key),
+              dsentry->delegation_chain_entry->subject_attribute);
+}
+
+static int
+handle_bidirectional_match (struct DelegationSetQueueEntry *actual_entry,
+                            struct DelegationSetQueueEntry *match_entry,
+                            struct VerifyRequestHandle *vrh)
+{
+  struct DelegationSetQueueEntry *old_fw_parent;
+  struct DelegationSetQueueEntry *fw_entry = actual_entry;
+  struct DelegationSetQueueEntry *last_entry = match_entry;
+  // parent fixing, combine backward and forward chain parts
+  while (NULL != fw_entry->parent_queue_entry)
+  {
+    old_fw_parent = fw_entry->parent_queue_entry->parent_set;
+    // set parent
+    fw_entry->parent_queue_entry->parent_set = last_entry;
+
+    last_entry = fw_entry;
+    fw_entry = old_fw_parent;
+  }
+  // set last entry of chain as actual_entry
+  //actual_entry = last_entry;
+  // set refcount, loop all delegations
+  for (struct DelegateRecordEntry *del_entry = vrh->del_chain_head;
+       del_entry != NULL;
+       del_entry = del_entry->next)
+  {
+    if (0 != memcmp (&last_entry->delegation_chain_entry->subject_key,
+                     &del_entry->delegate->issuer_key,
+                     sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)))
+      continue;
+    if (0 != strcmp (last_entry->delegation_chain_entry->subject_attribute,
+                     del_entry->delegate->issuer_attribute))
+      continue;
+
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found delegate.\n");
+    // increase refcount of the start delegation
+    del_entry->refcount++;
+  }
+  // backtrack
+  for (struct DelegationSetQueueEntry *tmp_set = last_entry;
+       NULL != tmp_set->parent_queue_entry;
+       tmp_set = tmp_set->parent_queue_entry->parent_set)
+  {
+    tmp_set->parent_queue_entry->required_solutions--;
+
+    // add new found entry to vrh
+    vrh->delegation_chain_size++;
+    GNUNET_CONTAINER_DLL_insert (vrh->delegation_chain_head,
+                                 vrh->delegation_chain_tail,
+                                 tmp_set->delegation_chain_entry);
+
+    // if one node on the path still needs solutions, this current
+    // patch cannot fullfil the conditions and therefore stops here
+    // however, it is in the vrh and can be used by the other paths
+    // related to this path/collection/verification
+    if (0 < tmp_set->parent_queue_entry->required_solutions)
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                  "Chain requires more solutions, waiting...\n");
+      return GNUNET_NO;
+    }
+  }
+  return GNUNET_YES;
+}
+
 static void
 forward_resolution (void *cls,
                     uint32_t rd_count,
@@ -747,7 +869,6 @@ forward_resolution (void *cls,
 
     // Start: Credential Chain Entry
     // issuer key is subject key, who needs to be contacted to resolve this 
(forward, therefore subject)
-    // TODO: new ds_entry struct with subject_key (or one for both with 
contact_key or sth)
     ds_entry->issuer_key = GNUNET_new (struct GNUNET_CRYPTO_EcdsaPublicKey);
     GNUNET_memcpy (ds_entry->issuer_key,
                    &del->subject_key,
@@ -816,41 +937,44 @@ forward_resolution (void *cls,
       }
     }
 
-    // TODO testing area   
-
-    // Check list
-    for (struct DelegationSetQueueEntry *del_entry = dsq_head;
-               del_entry != NULL;
-               del_entry = del_entry->next)
+    // Check for bidirectional crossmatch
+    for (struct DelegationSetQueueEntry *del_entry = vrh->dsq_head;
+         del_entry != NULL;
+         del_entry = del_entry->next)
     {
-      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"--fw-------- %s.%s <- %s.%s\n", 
-      
GNUNET_CRYPTO_ecdsa_public_key_to_string(&del_entry->delegation_chain_entry->issuer_key),
-      del_entry->delegation_chain_entry->issuer_attribute,
-      
GNUNET_CRYPTO_ecdsa_public_key_to_string(&del_entry->delegation_chain_entry->subject_key),
-      del_entry->delegation_chain_entry->subject_attribute);
-
-      // only check entries not added by forward algorithm
-      if(del_entry->from_bw)
+      // only check entries not by backward algorithm
+      if (del_entry->from_bw)
       {
         // key of list entry matches actual key
         if (0 == memcmp (&del_entry->delegation_chain_entry->subject_key,
-                             &ds_entry->delegation_chain_entry->issuer_key,
-                             sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)))
+                         &ds_entry->delegation_chain_entry->issuer_key,
+                         sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)))
         {
           // compare entry subject attributes to this trailer (iss attr + old 
trailer)
-          if (0 == strcmp 
(del_entry->delegation_chain_entry->subject_attribute,
-                               ds_entry->attr_trailer))
+          if (0 == strcmp (del_entry->unresolved_attribute_delegation,
+                           ds_entry->attr_trailer))
           {
-            GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"--fw-------- Found match with 
above!\n"); 
+            GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                        "Forward: %s!\n",
+                        del_entry->unresolved_attribute_delegation);
+            print_deleset (del_entry, "Forward:");
+            GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                        "Forward: Found match with above!\n");
+
+            // one node on the path still needs solutions: return
+            if (GNUNET_NO ==
+                handle_bidirectional_match (ds_entry, del_entry, vrh))
+              return;
+
             send_lookup_response (vrh);
             return;
           }
         }
       }
     }
-    // No crossmatch/bidirectional result, add this ds_entry for the bw algo 
to match
-    ds_entry->from_bw = false; 
-    GNUNET_CONTAINER_DLL_insert (dsq_head, dsq_tail, ds_entry);
+    // No crossmatch/bidirectional found, add this ds_entry for the bw algo to 
match
+    ds_entry->from_bw = false;
+    GNUNET_CONTAINER_DLL_insert (vrh->dsq_head, vrh->dsq_tail, ds_entry);
 
     // Starting a new GNS lookup
     vrh->pending_lookups++;
@@ -878,17 +1002,6 @@ forward_resolution (void *cls,
   }
 }
 
-static void
-print_deleset(struct DelegationSetQueueEntry *dsentry, char* text)
-{
-  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"%s %s.%s <- %s.%s\n",
-                        text, 
-                        
GNUNET_CRYPTO_ecdsa_public_key_to_string(&dsentry->delegation_chain_entry->issuer_key),
-                        dsentry->delegation_chain_entry->issuer_attribute,
-                        
GNUNET_CRYPTO_ecdsa_public_key_to_string(&dsentry->delegation_chain_entry->subject_key),
-                        dsentry->delegation_chain_entry->subject_attribute);
-}
-
 static void
 backward_resolution (void *cls,
                      uint32_t rd_count,
@@ -987,9 +1100,10 @@ backward_resolution (void *cls,
 
       ds_entry->parent_queue_entry = dq_entry; // current_delegation;
 
-      GNUNET_CONTAINER_DLL_insert (dq_entry->set_entries_head,
+      // TODO required? everything in dsq_head list, change cleanup
+      /*GNUNET_CONTAINER_DLL_insert (dq_entry->set_entries_head,
                                    dq_entry->set_entries_tail,
-                                   ds_entry);
+                                   ds_entry);*/
 
       /**
        * Check if this delegation already matches one of our credentials
@@ -1000,7 +1114,7 @@ backward_resolution (void *cls,
            del_pointer = del_pointer->next)
       {
         // If key and attribute match credential: continue and backtrack
-        if (0 != memcmp (&set->subject_key,
+        if (0 != memcmp (&set[j].subject_key,
                          &del_pointer->delegate->issuer_key,
                          sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)))
           continue;
@@ -1033,7 +1147,7 @@ backward_resolution (void *cls,
             break;
         }
 
-        // if the break above is not called the condition of the for is met 
+        // if the break above is not called the condition of the for is met
         if (NULL == tmp_set->parent_queue_entry)
         {
           GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "All solutions found\n");
@@ -1073,94 +1187,33 @@ backward_resolution (void *cls,
         ds_entry->attr_trailer = GNUNET_strdup (next_attr);
       }
 
-
-      // TODO testing area
-      // Check list
-      for (struct DelegationSetQueueEntry *del_entry = dsq_head;
-                del_entry != NULL;
-                del_entry = del_entry->next)
+      // Check for bidirectional crossmatch
+      for (struct DelegationSetQueueEntry *del_entry = vrh->dsq_head;
+           del_entry != NULL;
+           del_entry = del_entry->next)
       {
-        print_deleset(del_entry, "-----bw----- ");
-
-        // only check entries not added by forward algorithm
-        if(!del_entry->from_bw)
+        // only check entries added by forward algorithm
+        if (!del_entry->from_bw)
         {
           // key of list entry matches actual key
           if (0 == memcmp (&del_entry->delegation_chain_entry->issuer_key,
-                              &ds_entry->delegation_chain_entry->subject_key,
-                              sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)))
+                           &ds_entry->delegation_chain_entry->subject_key,
+                           sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)))
           {
             // compare entry subject attributes to this trailer (iss attr + 
old trailer)
             if (0 == strcmp (del_entry->attr_trailer,
-                                
ds_entry->delegation_chain_entry->subject_attribute))
+                             ds_entry->unresolved_attribute_delegation))
             {
-              GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,"--bw-------- Found match 
with above!\n"); 
-              
-              //TODO parents are not set correctly, for FW parents are going 
down in the chain
-              // and for BW parents are going up
-              // therefore: parent fixing needs to be done and then the stuff 
from above
-              // backtrack(required solutions) and refcount++
-              // might need some functions cuz its getting real big in here
-
-              struct DelegationSetQueueEntry *old_fw_parent;
-              struct DelegationSetQueueEntry *fw_entry = del_entry;
-              struct DelegationSetQueueEntry *bw_entry = ds_entry;
-              // parentset and add
-              while(NULL != fw_entry->parent_queue_entry)
-              {
-                print_deleset(fw_entry, "-----in while----- ");
-                old_fw_parent = fw_entry->parent_queue_entry->parent_set;
-                // set parent
-                fw_entry->parent_queue_entry->parent_set = bw_entry;
+              print_deleset (del_entry, "Backward:");
+              GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                          "Backward: Found match with above!\n");
 
-                bw_entry = fw_entry;
-                fw_entry = old_fw_parent;
-              }
-              GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "NACH WHILE\n");
-              // set last entry of chain as actual ds_entry
-              ds_entry = bw_entry;
-              // set refcount, loop all delegations
-              for (del_pointer = vrh->del_chain_head; del_pointer != NULL;
-                  del_pointer = del_pointer->next)
-              {
-                if (0 != memcmp 
(&ds_entry->delegation_chain_entry->subject_key,
-                         &del_pointer->delegate->issuer_key,
-                         sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)))
-                  continue;
-                if (0 != strcmp 
(ds_entry->delegation_chain_entry->subject_attribute,
-                                del_pointer->delegate->issuer_attribute))
-                  continue;
-
-                GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found delegate.\n");
-                // increase refcount of the start delegation
-                del_pointer->refcount++;
-              }
-              // backtrack
-              for (tmp_set = ds_entry; NULL != tmp_set->parent_queue_entry;
-                  tmp_set = tmp_set->parent_queue_entry->parent_set)
-              {
-                //TODO set refcount
-                print_deleset(tmp_set, "-----ENDSET----- ");
-                tmp_set->parent_queue_entry->required_solutions--;
+              // if one node on the path still needs solutions: return
+              if (GNUNET_NO ==
+                  handle_bidirectional_match (del_entry, ds_entry, vrh))
+                break;
 
-                // add new found entry to vrh
-                vrh->delegation_chain_size++;
-                GNUNET_CONTAINER_DLL_insert (vrh->delegation_chain_head,
-                                         vrh->delegation_chain_tail,
-                                         tmp_set->delegation_chain_entry);
-
-                // if one node on the path still needs solutions, this current
-                // patch cannot fullfil the conditions and therefore stops here
-                // however, it is in the vrh and can be used by the other paths
-                // related to this path/collection/verification
-                if (0 < tmp_set->parent_queue_entry->required_solutions)
-                {
-                  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Chain requires more 
solutions, waiting...\n");
-                  return;
-                }
-              }
-              GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "NACH FOR\n");
-              
+              // Send lookup response
               send_lookup_response (vrh);
               return;
             }
@@ -1168,11 +1221,11 @@ backward_resolution (void *cls,
         }
       }
       // No crossmatch/bidirectional result, add this ds_entry for the bw algo 
to match
-      ds_entry->from_bw = true; 
-      GNUNET_CONTAINER_DLL_insert (dsq_head, dsq_tail, ds_entry);
-
+      ds_entry->from_bw = true;
 
+      GNUNET_CONTAINER_DLL_insert (vrh->dsq_head, vrh->dsq_tail, ds_entry);
 
+      // Starting a new GNS lookup
       GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                   "Looking up %s\n",
                   ds_entry->lookup_attribute);
@@ -1225,6 +1278,13 @@ delegation_chain_bw_resolution_start (void *cls)
     return;
   }
 
+  // Pre-check with vrh->dele_chain_.. if match issuer_key
+  // Backward: check every cred entry if match issuer key
+  // otherwise: start at issuer and go down till match
+  // A.a <- ...
+  // X.x <- C
+  // Y.y <- C
+  // if not X.x or Y.y == A.a stat at A
   for (del_entry = vrh->del_chain_head; del_entry != NULL;
        del_entry = del_entry->next)
   {
@@ -1283,19 +1343,6 @@ delegation_chain_fw_resolution_start (void *cls)
   // set to 0 and increase on each lookup: for fw multiple lookups (may be) 
started
   vrh->pending_lookups = 0;
 
-  //TODO no pre-check with vrh->dele_chain_bla if match issuer_key
-  //otherwise: start mutliple lookups for each vrh->dele_chain
-  // A.a <- ...
-  // X.x <- C
-  // Y.y <- C
-  // wenn X.x oder Y.y nicht == A.a dann starte bei X und bei Y
-
-  // bei backward: check every cred entry if match issuer key
-  // otherwise: start at issuer and go down till match
-  // A.a <- ...
-  // X.x <- C
-  // Y.y <- C
-  // wenn X.x oder Y.y nicht == A.a dann starte von A
   if (0 == vrh->del_chain_size)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No delegations found\n");
@@ -1303,7 +1350,12 @@ delegation_chain_fw_resolution_start (void *cls)
     return;
   }
 
-  // Check if one of the delegations of the subject already match
+  // Pre-check with vrh->dele_chain_.. if match issuer_key
+  // otherwise FW: start mutliple lookups for each vrh->dele_chain
+  // A.a <- ...
+  // X.x <- C
+  // Y.y <- C
+  // if not X.x or Y.y  == A.a start at X and at Y
   for (del_entry = vrh->del_chain_head; del_entry != NULL;
        del_entry = del_entry->next)
   {
@@ -1337,7 +1389,6 @@ delegation_chain_fw_resolution_start (void *cls)
 
     ds_entry = GNUNET_new (struct DelegationSetQueueEntry);
     ds_entry->issuer_key = GNUNET_new (struct GNUNET_CRYPTO_EcdsaPublicKey);
-    // TODO: new ds_entry struct with subject_key (or one for both with 
contact_key or sth)
     GNUNET_memcpy (ds_entry->issuer_key,
                    &del_entry->delegate->subject_key,
                    sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey));
@@ -1416,6 +1467,13 @@ handle_verify (void *cls, const struct VerifyMessage 
*v_msg)
   vrh->issuer_attribute = GNUNET_strdup (issuer_attribute);
   vrh->resolution_algo = ntohs (v_msg->resolution_algo);
 
+  vrh->del_chain_head = NULL;
+  vrh->del_chain_tail = NULL;
+  vrh->dsq_head = NULL;
+  vrh->dsq_tail = NULL;
+  vrh->del_chain_head = NULL;
+  vrh->del_chain_tail = NULL;
+
   GNUNET_SERVICE_client_continue (vrh->client);
   if (0 == strlen (issuer_attribute))
   {
@@ -1467,12 +1525,14 @@ handle_verify (void *cls, const struct VerifyMessage 
*v_msg)
   }
 
   // Switch resolution algo
-  if(GNUNET_CREDENTIAL_FLAG_BACKWARD & vrh->resolution_algo && 
GNUNET_CREDENTIAL_FLAG_FORWARD & vrh->resolution_algo)
+  if (GNUNET_CREDENTIAL_FLAG_BACKWARD & vrh->resolution_algo &&
+      GNUNET_CREDENTIAL_FLAG_FORWARD & vrh->resolution_algo)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "--------BOTH\n");
     delegation_chain_fw_resolution_start (vrh);
     delegation_chain_bw_resolution_start (vrh);
-  } else if (GNUNET_CREDENTIAL_FLAG_BACKWARD & vrh->resolution_algo)
+  }
+  else if (GNUNET_CREDENTIAL_FLAG_BACKWARD & vrh->resolution_algo)
   {
     delegation_chain_bw_resolution_start (vrh);
   }
@@ -1498,13 +1558,14 @@ delegate_collection_finished (void *cls)
   struct VerifyRequestHandle *vrh = cls;
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Done collecting delegates.\n");
 
-  //TODO correct calls
-  if(GNUNET_CREDENTIAL_FLAG_BACKWARD & vrh->resolution_algo && 
GNUNET_CREDENTIAL_FLAG_FORWARD & vrh->resolution_algo)
+  // if both are set: bidirectional search, meaning start both chain 
resolutions
+  if (GNUNET_CREDENTIAL_FLAG_BACKWARD & vrh->resolution_algo &&
+      GNUNET_CREDENTIAL_FLAG_FORWARD & vrh->resolution_algo)
   {
-    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "--------BOTH\n");
     delegation_chain_fw_resolution_start (vrh);
     delegation_chain_bw_resolution_start (vrh);
-  }else if (GNUNET_CREDENTIAL_FLAG_BACKWARD & vrh->resolution_algo)
+  }
+  else if (GNUNET_CREDENTIAL_FLAG_BACKWARD & vrh->resolution_algo)
   {
     delegation_chain_bw_resolution_start (vrh);
   }
@@ -1581,6 +1642,13 @@ handle_collect (void *cls, const struct CollectMessage 
*c_msg)
   vrh->issuer_attribute = GNUNET_strdup (issuer_attribute);
   vrh->resolution_algo = ntohs (c_msg->resolution_algo);
 
+  vrh->del_chain_head = NULL;
+  vrh->del_chain_tail = NULL;
+  vrh->dsq_head = NULL;
+  vrh->dsq_tail = NULL;
+  vrh->del_chain_head = NULL;
+  vrh->del_chain_tail = NULL;
+
   if (0 == strlen (issuer_attribute))
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No issuer attribute provided!\n");
diff --git a/src/credential/test_credential_bi.sh 
b/src/credential/test_credential_bi_and.sh
similarity index 85%
copy from src/credential/test_credential_bi.sh
copy to src/credential/test_credential_bi_and.sh
index 2b8cfc452..c69aea53f 100755
--- a/src/credential/test_credential_bi.sh
+++ b/src/credential/test_credential_bi_and.sh
@@ -28,6 +28,7 @@ gnunet-identity -C d -c test_credential_lookup.conf
 gnunet-identity -C e -c test_credential_lookup.conf
 gnunet-identity -C f -c test_credential_lookup.conf
 gnunet-identity -C g -c test_credential_lookup.conf
+gnunet-identity -C h -c test_credential_lookup.conf
 AKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep a | awk 
'{print $3}')
 BKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep b | awk 
'{print $3}')
 CKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep c | awk 
'{print $3}')
@@ -35,17 +36,22 @@ DKEY=$(gnunet-identity -d -c test_credential_lookup.conf | 
grep d | awk '{print
 EKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep e | awk 
'{print $3}')
 FKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep f | awk 
'{print $3}')
 GKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep g | awk 
'{print $3}')
+HKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep h | awk 
'{print $3}')
 
 #   (1) (A.a) <- B.b
-#   (2) (B.b) <- C.c
+#   (2) (B.b) <- C.c AND G.g
 #   (3) C.c <- (D.D)
 #   (4) D.d <- (E.e)
-#   (5) E.e <- (F)
+#   (5) E.e <- (F) priv
+#   (6) (G.g) <- H.h 
+#   (7) H.h <- (F) priv
 
 # BIDIRECTIONAL
 gnunet-credential --createIssuerSide --ego=a --attribute="a" --subject="$BKEY 
b" --ttl=5m -c test_credential_lookup.conf
 gnunet-namestore -D -z a
-gnunet-credential --createIssuerSide --ego=b --attribute="b" --subject="$CKEY 
c" --ttl=5m -c test_credential_lookup.conf
+gnunet-credential --createIssuerSide --ego=b --attribute="b" --subject="$CKEY 
c, $GKEY g" --ttl=5m -c test_credential_lookup.conf
+gnunet-namestore -D -z b
+gnunet-credential --createIssuerSide --ego=g --attribute="g" --subject="$HKEY 
h" --ttl=5m -c test_credential_lookup.conf
 gnunet-namestore -D -z b
 
 SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=c 
--attribute="c" --subject="$DKEY d" --ttl="2019-12-12 10:00:00"`
@@ -57,6 +63,9 @@ gnunet-namestore -D -z e
 SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=e 
--attribute="e" --subject="$FKEY" --ttl="2019-12-12 10:00:00"`
 gnunet-credential --createSubjectSide --ego=f --import "$SIGNED" --private
 gnunet-namestore -D -z f
+SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=h 
--attribute="h" --subject="$FKEY" --ttl="2019-12-12 10:00:00"`
+gnunet-credential --createSubjectSide --ego=f --import "$SIGNED" --private
+gnunet-namestore -D -z h
 
 # Starting to resolve
 echo "+++ Starting to Resolve +++"
diff --git a/src/credential/test_credential_bi.sh 
b/src/credential/test_credential_bi_and2.sh
similarity index 83%
copy from src/credential/test_credential_bi.sh
copy to src/credential/test_credential_bi_and2.sh
index 2b8cfc452..de3e718aa 100755
--- a/src/credential/test_credential_bi.sh
+++ b/src/credential/test_credential_bi_and2.sh
@@ -28,6 +28,7 @@ gnunet-identity -C d -c test_credential_lookup.conf
 gnunet-identity -C e -c test_credential_lookup.conf
 gnunet-identity -C f -c test_credential_lookup.conf
 gnunet-identity -C g -c test_credential_lookup.conf
+gnunet-identity -C h -c test_credential_lookup.conf
 AKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep a | awk 
'{print $3}')
 BKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep b | awk 
'{print $3}')
 CKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep c | awk 
'{print $3}')
@@ -35,17 +36,19 @@ DKEY=$(gnunet-identity -d -c test_credential_lookup.conf | 
grep d | awk '{print
 EKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep e | awk 
'{print $3}')
 FKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep f | awk 
'{print $3}')
 GKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep g | awk 
'{print $3}')
+HKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep h | awk 
'{print $3}')
 
 #   (1) (A.a) <- B.b
-#   (2) (B.b) <- C.c
+#   (2) (B.b) <- C.c AND G.g
 #   (3) C.c <- (D.D)
 #   (4) D.d <- (E.e)
-#   (5) E.e <- (F)
+#   (5) E.e <- (F) priv
+#   (6) G.g <- (F) priv
 
 # BIDIRECTIONAL
 gnunet-credential --createIssuerSide --ego=a --attribute="a" --subject="$BKEY 
b" --ttl=5m -c test_credential_lookup.conf
 gnunet-namestore -D -z a
-gnunet-credential --createIssuerSide --ego=b --attribute="b" --subject="$CKEY 
c" --ttl=5m -c test_credential_lookup.conf
+gnunet-credential --createIssuerSide --ego=b --attribute="b" --subject="$CKEY 
c, $GKEY g" --ttl=5m -c test_credential_lookup.conf
 gnunet-namestore -D -z b
 
 SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=c 
--attribute="c" --subject="$DKEY d" --ttl="2019-12-12 10:00:00"`
@@ -57,14 +60,17 @@ gnunet-namestore -D -z e
 SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=e 
--attribute="e" --subject="$FKEY" --ttl="2019-12-12 10:00:00"`
 gnunet-credential --createSubjectSide --ego=f --import "$SIGNED" --private
 gnunet-namestore -D -z f
+SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=g 
--attribute="g" --subject="$FKEY" --ttl="2019-12-12 10:00:00"`
+gnunet-credential --createSubjectSide --ego=f --import "$SIGNED" --private
+gnunet-namestore -D -z h
 
 # Starting to resolve
 echo "+++ Starting to Resolve +++"
 
-DELS=`$DO_TIMEOUT gnunet-credential --collect --issuer=$AKEY --attribute="a" 
--ego=f --forward --backward -c test_credential_lookup.conf | paste -d, -s`
+DELS=`$DO_TIMEOUT gnunet-credential --collect --issuer=$AKEY --attribute="a" 
--ego=f -c test_credential_lookup.conf | paste -d, -s`
 echo $DELS
-echo gnunet-credential --verify --issuer=$AKEY --attribute="a" --subject=$FKEY 
--delegate=\'$DELS\' --forward --backward -c test_credential_lookup.conf
-RES_DELS=`gnunet-credential --verify --issuer=$AKEY --attribute="a" 
--subject=$FKEY --delegate="$DELS" --forward --backward -c 
test_credential_lookup.conf`
+echo gnunet-credential --verify --issuer=$AKEY --attribute="a" --subject=$FKEY 
--delegate=\'$DELS\' -c test_credential_lookup.conf
+RES_DELS=`gnunet-credential --verify --issuer=$AKEY --attribute="a" 
--subject=$FKEY --delegate="$DELS" -c test_credential_lookup.conf`
 
 # Cleanup properly
 gnunet-namestore -z epub -d -n $DISC_ATTR -t ATTR -c 
test_credential_lookup.conf
diff --git a/src/credential/test_credential_bi.sh 
b/src/credential/test_credential_bi_bw.sh
similarity index 100%
copy from src/credential/test_credential_bi.sh
copy to src/credential/test_credential_bi_bw.sh
diff --git a/src/credential/test_credential_bi.sh 
b/src/credential/test_credential_bi_bw_link.sh
similarity index 94%
copy from src/credential/test_credential_bi.sh
copy to src/credential/test_credential_bi_bw_link.sh
index 2b8cfc452..dd66741fa 100755
--- a/src/credential/test_credential_bi.sh
+++ b/src/credential/test_credential_bi_bw_link.sh
@@ -37,7 +37,8 @@ FKEY=$(gnunet-identity -d -c test_credential_lookup.conf | 
grep f | awk '{print
 GKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep g | awk 
'{print $3}')
 
 #   (1) (A.a) <- B.b
-#   (2) (B.b) <- C.c
+#   (2) (B.b) <- G.g.c
+#   (3) (G.g) <- C
 #   (3) C.c <- (D.D)
 #   (4) D.d <- (E.e)
 #   (5) E.e <- (F)
@@ -45,7 +46,9 @@ GKEY=$(gnunet-identity -d -c test_credential_lookup.conf | 
grep g | awk '{print
 # BIDIRECTIONAL
 gnunet-credential --createIssuerSide --ego=a --attribute="a" --subject="$BKEY 
b" --ttl=5m -c test_credential_lookup.conf
 gnunet-namestore -D -z a
-gnunet-credential --createIssuerSide --ego=b --attribute="b" --subject="$CKEY 
c" --ttl=5m -c test_credential_lookup.conf
+gnunet-credential --createIssuerSide --ego=b --attribute="b" --subject="$GKEY 
g.c" --ttl=5m -c test_credential_lookup.conf
+gnunet-namestore -D -z b
+gnunet-credential --createIssuerSide --ego=g --attribute="g" --subject="$CKEY" 
--ttl=5m -c test_credential_lookup.conf
 gnunet-namestore -D -z b
 
 SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=c 
--attribute="c" --subject="$DKEY d" --ttl="2019-12-12 10:00:00"`
diff --git a/src/credential/test_credential_bi.sh 
b/src/credential/test_credential_bi_bw_link2.sh
similarity index 92%
copy from src/credential/test_credential_bi.sh
copy to src/credential/test_credential_bi_bw_link2.sh
index 2b8cfc452..46a04a26e 100755
--- a/src/credential/test_credential_bi.sh
+++ b/src/credential/test_credential_bi_bw_link2.sh
@@ -37,17 +37,21 @@ FKEY=$(gnunet-identity -d -c test_credential_lookup.conf | 
grep f | awk '{print
 GKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep g | awk 
'{print $3}')
 
 #   (1) (A.a) <- B.b
-#   (2) (B.b) <- C.c
-#   (3) C.c <- (D.D)
+#   (2) (B.b) <- G.g.c
+#   (3) G.g <- (C)
+#   (3) C.c <- (D.d)
 #   (4) D.d <- (E.e)
 #   (5) E.e <- (F)
 
 # BIDIRECTIONAL
 gnunet-credential --createIssuerSide --ego=a --attribute="a" --subject="$BKEY 
b" --ttl=5m -c test_credential_lookup.conf
 gnunet-namestore -D -z a
-gnunet-credential --createIssuerSide --ego=b --attribute="b" --subject="$CKEY 
c" --ttl=5m -c test_credential_lookup.conf
+gnunet-credential --createIssuerSide --ego=b --attribute="b" --subject="$GKEY 
g.c" --ttl=5m -c test_credential_lookup.conf
 gnunet-namestore -D -z b
 
+SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=g 
--attribute="g" --subject="$CKEY" --ttl="2019-12-12 10:00:00"`
+gnunet-credential --createSubjectSide --ego=c --import "$SIGNED"
+gnunet-namestore -D -z c
 SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=c 
--attribute="c" --subject="$DKEY d" --ttl="2019-12-12 10:00:00"`
 gnunet-credential --createSubjectSide --ego=d --import "$SIGNED"
 gnunet-namestore -D -z d
diff --git a/src/credential/test_credential_bi.sh 
b/src/credential/test_credential_bi_fw.sh
similarity index 86%
copy from src/credential/test_credential_bi.sh
copy to src/credential/test_credential_bi_fw.sh
index 2b8cfc452..5df73a4fd 100755
--- a/src/credential/test_credential_bi.sh
+++ b/src/credential/test_credential_bi_fw.sh
@@ -40,7 +40,8 @@ GKEY=$(gnunet-identity -d -c test_credential_lookup.conf | 
grep g | awk '{print
 #   (2) (B.b) <- C.c
 #   (3) C.c <- (D.D)
 #   (4) D.d <- (E.e)
-#   (5) E.e <- (F)
+#   (5) E.e <- (F.f)
+#   (6) F.f <- (G)
 
 # BIDIRECTIONAL
 gnunet-credential --createIssuerSide --ego=a --attribute="a" --subject="$BKEY 
b" --ttl=5m -c test_credential_lookup.conf
@@ -54,19 +55,23 @@ gnunet-namestore -D -z d
 SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=d 
--attribute="d" --subject="$EKEY e" --ttl="2019-12-12 10:00:00"`
 gnunet-credential --createSubjectSide --ego=e --import "$SIGNED"
 gnunet-namestore -D -z e
-SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=e 
--attribute="e" --subject="$FKEY" --ttl="2019-12-12 10:00:00"`
-gnunet-credential --createSubjectSide --ego=f --import "$SIGNED" --private
+SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=e 
--attribute="e" --subject="$FKEY f" --ttl="2019-12-12 10:00:00"`
+gnunet-credential --createSubjectSide --ego=f --import "$SIGNED" 
 gnunet-namestore -D -z f
+SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=f 
--attribute="f" --subject="$GKEY" --ttl="2019-12-12 10:00:00"`
+gnunet-credential --createSubjectSide --ego=g --import "$SIGNED" --private
+gnunet-namestore -D -z g
 
 # Starting to resolve
 echo "+++ Starting to Resolve +++"
 
-DELS=`$DO_TIMEOUT gnunet-credential --collect --issuer=$AKEY --attribute="a" 
--ego=f --forward --backward -c test_credential_lookup.conf | paste -d, -s`
+DELS=`$DO_TIMEOUT gnunet-credential --collect --issuer=$AKEY --attribute="a" 
--ego=g --forward --backward -c test_credential_lookup.conf | paste -d, -s`
 echo $DELS
-echo gnunet-credential --verify --issuer=$AKEY --attribute="a" --subject=$FKEY 
--delegate=\'$DELS\' --forward --backward -c test_credential_lookup.conf
-RES_DELS=`gnunet-credential --verify --issuer=$AKEY --attribute="a" 
--subject=$FKEY --delegate="$DELS" --forward --backward -c 
test_credential_lookup.conf`
+echo gnunet-credential --verify --issuer=$AKEY --attribute="a" --subject=$GKEY 
--delegate=\'$DELS\' --forward --backward -c test_credential_lookup.conf
+RES_DELS=`gnunet-credential --verify --issuer=$AKEY --attribute="a" 
--subject=$GKEY --delegate="$DELS" --forward --backward -c 
test_credential_lookup.conf`
 
 # Cleanup properly
+gnunet-namestore -z a -d -n "@"-t DELE -c test_credential_lookup.conf
 gnunet-namestore -z epub -d -n $DISC_ATTR -t ATTR -c 
test_credential_lookup.conf
 gnunet-namestore -z eorg -d -n $PREF_ATTR -t ATTR -c 
test_credential_lookup.conf
 gnunet-namestore -z stateu -d -n $STATE_STUD_ATTR -t ATTR -c 
test_credential_lookup.conf
diff --git a/src/credential/test_credential_bi.sh 
b/src/credential/test_credential_own_and2.sh
similarity index 77%
rename from src/credential/test_credential_bi.sh
rename to src/credential/test_credential_own_and2.sh
index 2b8cfc452..bbce251ec 100755
--- a/src/credential/test_credential_bi.sh
+++ b/src/credential/test_credential_own_and2.sh
@@ -28,6 +28,7 @@ gnunet-identity -C d -c test_credential_lookup.conf
 gnunet-identity -C e -c test_credential_lookup.conf
 gnunet-identity -C f -c test_credential_lookup.conf
 gnunet-identity -C g -c test_credential_lookup.conf
+gnunet-identity -C h -c test_credential_lookup.conf
 AKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep a | awk 
'{print $3}')
 BKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep b | awk 
'{print $3}')
 CKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep c | awk 
'{print $3}')
@@ -35,36 +36,33 @@ DKEY=$(gnunet-identity -d -c test_credential_lookup.conf | 
grep d | awk '{print
 EKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep e | awk 
'{print $3}')
 FKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep f | awk 
'{print $3}')
 GKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep g | awk 
'{print $3}')
+HKEY=$(gnunet-identity -d -c test_credential_lookup.conf | grep h | awk 
'{print $3}')
 
 #   (1) (A.a) <- B.b
-#   (2) (B.b) <- C.c
-#   (3) C.c <- (D.D)
-#   (4) D.d <- (E.e)
-#   (5) E.e <- (F)
+#   (2) (B.b) <- C.c AND G.g
+#   (3) C.c <- (F) priv
+#   (4) G.g <- (F) priv
 
 # BIDIRECTIONAL
 gnunet-credential --createIssuerSide --ego=a --attribute="a" --subject="$BKEY 
b" --ttl=5m -c test_credential_lookup.conf
 gnunet-namestore -D -z a
-gnunet-credential --createIssuerSide --ego=b --attribute="b" --subject="$CKEY 
c" --ttl=5m -c test_credential_lookup.conf
+gnunet-credential --createIssuerSide --ego=b --attribute="b" --subject="$CKEY 
c, $GKEY g" --ttl=5m -c test_credential_lookup.conf
 gnunet-namestore -D -z b
 
-SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=c 
--attribute="c" --subject="$DKEY d" --ttl="2019-12-12 10:00:00"`
-gnunet-credential --createSubjectSide --ego=d --import "$SIGNED"
-gnunet-namestore -D -z d
-SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=d 
--attribute="d" --subject="$EKEY e" --ttl="2019-12-12 10:00:00"`
-gnunet-credential --createSubjectSide --ego=e --import "$SIGNED"
-gnunet-namestore -D -z e
-SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=e 
--attribute="e" --subject="$FKEY" --ttl="2019-12-12 10:00:00"`
+SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=g 
--attribute="g" --subject="$FKEY" --ttl="2019-12-12 10:00:00"`
+gnunet-credential --createSubjectSide --ego=f --import "$SIGNED" --private
+gnunet-namestore -D -z h
+SIGNED=`$DO_TIMEOUT gnunet-credential --signSubjectSide --ego=c 
--attribute="c" --subject="$FKEY" --ttl="2019-12-12 10:00:00"`
 gnunet-credential --createSubjectSide --ego=f --import "$SIGNED" --private
 gnunet-namestore -D -z f
 
 # Starting to resolve
 echo "+++ Starting to Resolve +++"
 
-DELS=`$DO_TIMEOUT gnunet-credential --collect --issuer=$AKEY --attribute="a" 
--ego=f --forward --backward -c test_credential_lookup.conf | paste -d, -s`
+DELS=`$DO_TIMEOUT gnunet-credential --collect --issuer=$AKEY --attribute="a" 
--ego=f --backward -c test_credential_lookup.conf | paste -d, -s`
 echo $DELS
-echo gnunet-credential --verify --issuer=$AKEY --attribute="a" --subject=$FKEY 
--delegate=\'$DELS\' --forward --backward -c test_credential_lookup.conf
-RES_DELS=`gnunet-credential --verify --issuer=$AKEY --attribute="a" 
--subject=$FKEY --delegate="$DELS" --forward --backward -c 
test_credential_lookup.conf`
+echo gnunet-credential --verify --issuer=$AKEY --attribute="a" --subject=$FKEY 
--delegate=\'$DELS\'  --backward -c test_credential_lookup.conf
+RES_DELS=`gnunet-credential --verify --issuer=$AKEY --attribute="a" 
--subject=$FKEY --delegate="$DELS"  --backward -c test_credential_lookup.conf`
 
 # Cleanup properly
 gnunet-namestore -z epub -d -n $DISC_ATTR -t ATTR -c 
test_credential_lookup.conf

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