// This file is under GNU General Public License 3.0

 // see LICENSE.txt

 #include "platform.h"

 #include <string.h>

 #include <stdio.h>

 #include <stdlib.h>

 #include <assert.h>

 #include <ctype.h>

 #include "pEp_internal.h"

 #include "keymanagement.h"

 #include "blacklist.h"

 static bool key_matches_address(PEP_SESSION session, const char* address,

                                 const char* fpr) {

     if (!session || !address || !fpr)

         return false;

     bool retval = false;

     stringlist_t *keylist = NULL;

     PEP_STATUS status = find_keys(session, address, &keylist);

     if (status == PEP_STATUS_OK && keylist) {

         stringlist_t* curr = keylist;

         while (curr) {

             if (curr->value) {

                 if (strcasecmp(curr->value, fpr)) {

                     retval = true;

                     break;

                 }

             }

             curr = curr->next;

         }

     }

     free_stringlist(keylist);

     return retval;                             

 }

 PEP_STATUS elect_pubkey(

         PEP_SESSION session, pEp_identity * identity, bool check_blacklist

     )

 {

     PEP_STATUS status;

     stringlist_t *keylist = NULL;

     char *_fpr = "";

     identity->comm_type = PEP_ct_unknown;

     status = find_keys(session, identity->address, &keylist);

     assert(status != PEP_OUT_OF_MEMORY);

     if (status == PEP_OUT_OF_MEMORY)

         return PEP_OUT_OF_MEMORY;

     if (!keylist || !keylist->value)

         identity->comm_type = PEP_ct_key_not_found;    

     else {

         stringlist_t *_keylist;

         for (_keylist = keylist; _keylist && _keylist->value; _keylist = _keylist->next) {

             PEP_comm_type _comm_type_key;

             status = get_key_rating(session, _keylist->value, &_comm_type_key);

             assert(status != PEP_OUT_OF_MEMORY);

             if (status == PEP_OUT_OF_MEMORY) {

                 free_stringlist(keylist);

                 return PEP_OUT_OF_MEMORY;

             }

             if (_comm_type_key != PEP_ct_compromised &&

                 _comm_type_key != PEP_ct_unknown)

             {

                 if (identity->comm_type == PEP_ct_unknown ||

                     _comm_type_key > identity->comm_type)

                 {

                     bool blacklisted = false;

                     bool mistrusted = false;

                     status = is_mistrusted_key(session, _keylist->value, &mistrusted);

                     if (status == PEP_STATUS_OK && check_blacklist)

                         status = blacklist_is_listed(session, _keylist->value, &blacklisted);

                     if (status == PEP_STATUS_OK && !mistrusted && !blacklisted) {

                         identity->comm_type = _comm_type_key;

                         _fpr = _keylist->value;

                     }

                 }

             }

         }

     }

     free(identity->fpr);

     if (!_fpr || _fpr[0] == '\0')

         identity->fpr = NULL;

     else {    

         identity->fpr = strdup(_fpr);

         if (identity->fpr == NULL) {

             free_stringlist(keylist);

             return PEP_OUT_OF_MEMORY;

         }

     }

     free_stringlist(keylist);

     return PEP_STATUS_OK;

 }

 // own_must_contain_private is usually true when calling;

 // we only set it to false when we have the idea of

 // possibly having an own pubkey that we need to check on its own

 static PEP_STATUS validate_fpr(PEP_SESSION session, 

                                pEp_identity* ident,

                                bool check_blacklist,

                                bool own_must_contain_private) {

     PEP_STATUS status = PEP_STATUS_OK;

     if (!session || !ident || !ident->fpr || !ident->fpr[0])

         return PEP_ILLEGAL_VALUE;    

     char* fpr = ident->fpr;

     bool has_private = false;

     status = contains_priv_key(session, fpr, &has_private);

     if (ident->me && own_must_contain_private) {

         if (status != PEP_STATUS_OK || !has_private)

             return PEP_KEY_UNSUITABLE;

     }

     else if (status != PEP_STATUS_OK && has_private) // should never happen

         has_private = false;

     status = get_trust(session, ident);

     if (status != PEP_STATUS_OK)

         ident->comm_type = PEP_ct_unknown;

     PEP_comm_type ct = ident->comm_type;

     if (ct == PEP_ct_unknown) {

         // If status is bad, it's ok, we get the rating

         // we should use then (PEP_ct_unknown)

         get_key_rating(session, fpr, &ct);

         ident->comm_type = ct;

     }

     else if (ct == PEP_ct_key_expired || ct == PEP_ct_key_expired_but_confirmed) {

         PEP_comm_type ct_expire_check = PEP_ct_unknown;

         get_key_rating(session, fpr, &ct_expire_check);

         if (ct_expire_check >= PEP_ct_strong_but_unconfirmed) {

             ident->comm_type = ct_expire_check;

             if (ct == PEP_ct_key_expired_but_confirmed)

                 ident->comm_type |= PEP_ct_confirmed;

             ct = ident->comm_type;

             // We need to fix this trust in the DB.

             status = set_trust(session, ident);

         }

     }

     bool pEp_user = false;

     is_pEp_user(session, ident, &pEp_user);

     if (pEp_user) {

         switch (ct) {

             case PEP_ct_OpenPGP:

             case PEP_ct_OpenPGP_unconfirmed:

                 ct += 0x47; // difference between PEP and OpenPGP values;

                 ident->comm_type = ct;

                 break;

             default:

                 break;

         }

     }

     bool revoked, expired;

     bool blacklisted = false;

     status = key_revoked(session, fpr, &revoked);    

     if (status != PEP_STATUS_OK) {

         return status;

     }

     if (!revoked) {

         time_t exp_time = (ident->me ? 

                            time(NULL) + (7*24*3600) : time(NULL));

         status = key_expired(session, fpr, 

                              exp_time,

                              &expired);

         assert(status == PEP_STATUS_OK);

         if (status != PEP_STATUS_OK)

             return status;

         if (check_blacklist && IS_PGP_CT(ct) &&

             !ident->me) {

             status = blacklist_is_listed(session, 

                                          fpr, 

                                          &blacklisted);

             if (status != PEP_STATUS_OK)

                 return status;

         }

     }

     if (ident->me && has_private && 

         (ct >= PEP_ct_strong_but_unconfirmed) && 

         !revoked && expired) {

         // extend key

         timestamp *ts = new_timestamp(time(NULL) + KEY_EXPIRE_DELTA);

         status = renew_key(session, fpr, ts);

         free_timestamp(ts);

         if (status == PEP_STATUS_OK) {

             // if key is valid (second check because pEp key might be extended above)

             //      Return fpr        

             status = key_expired(session, fpr, time(NULL), &expired);            

             if (status != PEP_STATUS_OK)

                 return status;

             if (expired) {

                 if (ident->comm_type & PEP_ct_confirmed || (ident->comm_type == PEP_ct_key_expired_but_confirmed))

                     ident->comm_type = PEP_ct_key_expired_but_confirmed;

                 else

                     ident->comm_type = PEP_ct_key_expired;

                 return status;

             }

             // communicate key(?)

         }        

     }

     if (revoked) 

         ct = PEP_ct_key_revoked;

     else if (expired) {

         if (ident->comm_type & PEP_ct_confirmed || (ident->comm_type == PEP_ct_key_expired_but_confirmed))

             ct = PEP_ct_key_expired_but_confirmed;

         else

             ct = PEP_ct_key_expired;

     }

     else if (blacklisted) { // never true for .me

         ident->comm_type = ct = PEP_ct_key_not_found;

         free(ident->fpr);

             ident->fpr = strdup("");

         status = PEP_KEY_BLACKLISTED;

     }

     switch (ct) {

         case PEP_ct_key_expired:

         case PEP_ct_key_expired_but_confirmed:

         case PEP_ct_key_revoked:

         case PEP_ct_key_b0rken:

             // delete key from being default key for all users/identities

             status = remove_fpr_as_default(session, fpr);

             status = update_trust_for_fpr(session, 

                                           fpr, 

                                           ct);

         case PEP_ct_mistrusted:                                  

             free(ident->fpr);

             ident->fpr = NULL;

             ident->comm_type = ct;            

             status = PEP_KEY_UNSUITABLE;

         default:

             break;

     }            

     return status;

 }

 PEP_STATUS get_all_keys_for_user(PEP_SESSION session, 

                                  const char* user_id,

                                  stringlist_t** keys) {

     if (!session || EMPTYSTR(user_id) || !keys)

         return PEP_ILLEGAL_VALUE;

     PEP_STATUS status = PEP_STATUS_OK;

     *keys = NULL;

     stringlist_t* _kl = NULL;

     sqlite3_reset(session->get_all_keys_for_user);

     sqlite3_bind_text(session->get_all_keys_for_user, 1, user_id, -1, SQLITE_STATIC);

     int result = -1;

     while ((result = sqlite3_step(session->get_all_keys_for_user)) == SQLITE_ROW) {

         const char* keyres = (const char *) sqlite3_column_text(session->get_all_keys_for_user, 0);

         if (keyres) {

             if (_kl)

                 stringlist_add(_kl, keyres);

             else

                 _kl = new_stringlist(keyres);

         }

     }

     if (!_kl)

         return PEP_KEY_NOT_FOUND;

     *keys = _kl;

     sqlite3_reset(session->get_all_keys_for_user);

     return status;

 }

 PEP_STATUS get_user_default_key(PEP_SESSION session, const char* user_id,

                                 char** default_key) {

     assert(session);

     assert(user_id);

     if (!session || !user_id)

         return PEP_ILLEGAL_VALUE;

     PEP_STATUS status = PEP_STATUS_OK;

     // try to get default key for user_data

     sqlite3_reset(session->get_user_default_key);

     sqlite3_bind_text(session->get_user_default_key, 1, user_id, 

                       -1, SQLITE_STATIC);

     const int result = sqlite3_step(session->get_user_default_key);

     char* user_fpr = NULL;

     if (result == SQLITE_ROW) {

         const char* u_fpr =

             (char *) sqlite3_column_text(session->get_user_default_key, 0);

         if (u_fpr)

             user_fpr = strdup(u_fpr);

     }

     else

         status = PEP_GET_KEY_FAILED;

     sqlite3_reset(session->get_user_default_key);

     *default_key = user_fpr;

     return status;     

 }

 // Only call on retrieval of previously stored identity!

 // Also, we presume that if the stored_identity was sent in

 // without an fpr, there wasn't one in the trust DB for this

 // identity.

 PEP_STATUS get_valid_pubkey(PEP_SESSION session,

                          pEp_identity* stored_identity,

                          bool* is_identity_default,

                          bool* is_user_default,

                          bool* is_address_default,

                          bool check_blacklist) {

     PEP_STATUS status = PEP_STATUS_OK;

     if (!stored_identity || EMPTYSTR(stored_identity->user_id)

         || !is_identity_default || !is_user_default || !is_address_default)

         return PEP_ILLEGAL_VALUE;

     *is_identity_default = *is_user_default = *is_address_default = false;

     PEP_comm_type first_reject_comm_type = PEP_ct_key_not_found;

     PEP_STATUS first_reject_status = PEP_KEY_NOT_FOUND;

     char* stored_fpr = stored_identity->fpr;

     // Input: stored identity retrieved from database

     // if stored identity contains a default key

     if (!EMPTYSTR(stored_fpr)) {

         status = validate_fpr(session, stored_identity, check_blacklist, true);    

         if (status == PEP_STATUS_OK && !EMPTYSTR(stored_identity->fpr)) {

             *is_identity_default = *is_address_default = true;

             return status;

         }

         else if (status != PEP_KEY_NOT_FOUND) {

             first_reject_status = status;

             first_reject_comm_type = stored_identity->comm_type;

         }

     }

     // if no valid default stored identity key found

     free(stored_identity->fpr);

     stored_identity->fpr = NULL;

     char* user_fpr = NULL;

     status = get_user_default_key(session, stored_identity->user_id, &user_fpr);

     if (!EMPTYSTR(user_fpr)) {             

         // There exists a default key for user, so validate

         stored_identity->fpr = user_fpr;

         status = validate_fpr(session, stored_identity, check_blacklist, true);

         if (status == PEP_STATUS_OK && stored_identity->fpr) {

             *is_user_default = true;

             *is_address_default = key_matches_address(session, 

                                                       stored_identity->address,

                                                       stored_identity->fpr);

             return status;

         }        

         else if (status != PEP_KEY_NOT_FOUND && first_reject_status != PEP_KEY_NOT_FOUND) {

             first_reject_status = status;

             first_reject_comm_type = stored_identity->comm_type;

         }

     }

     status = elect_pubkey(session, stored_identity, check_blacklist);

     if (status == PEP_STATUS_OK) {

         if (!EMPTYSTR(stored_identity->fpr))

             validate_fpr(session, stored_identity, false, true); // blacklist already filtered of needed

     }    

     else if (status != PEP_KEY_NOT_FOUND && first_reject_status != PEP_KEY_NOT_FOUND) {

         first_reject_status = status;

         first_reject_comm_type = stored_identity->comm_type;

     }

     switch (stored_identity->comm_type) {

         case PEP_ct_key_revoked:

         case PEP_ct_key_b0rken:

         case PEP_ct_key_expired:

         case PEP_ct_key_expired_but_confirmed:

         case PEP_ct_compromised:

         case PEP_ct_mistrusted:

             // this only happens when it's all there is

             status = first_reject_status;

             free(stored_identity->fpr);

             stored_identity->fpr = NULL;

             stored_identity->comm_type = first_reject_comm_type;

             break;    

         default:

             if (check_blacklist && status == PEP_KEY_BLACKLISTED) {

                 free(stored_identity->fpr);

                 stored_identity->fpr = NULL;

                 stored_identity->comm_type = PEP_ct_key_not_found;

             }

             break;

     }

     return status;

 }

 static void transfer_ident_lang_and_flags(pEp_identity* new_ident,

                                           pEp_identity* stored_ident) {

     if (new_ident->lang[0] == 0) {

       new_ident->lang[0] = stored_ident->lang[0];

       new_ident->lang[1] = stored_ident->lang[1];

       new_ident->lang[2] = 0;

     }

     new_ident->flags = stored_ident->flags;

     new_ident->me = new_ident->me || stored_ident->me;

 }

 static void adjust_pEp_trust_status(PEP_SESSION session, pEp_identity* identity) {

     assert(session);

     assert(identity);

     if (identity->comm_type < PEP_ct_strong_but_unconfirmed ||

         (identity->comm_type | PEP_ct_confirmed) == PEP_ct_pEp)

         return;

     bool pEp_user;

     is_pEp_user(session, identity, &pEp_user);

     if (pEp_user) {

         PEP_comm_type confirmation_status = identity->comm_type & PEP_ct_confirmed;

         identity->comm_type = PEP_ct_pEp_unconfirmed | confirmation_status;    

     }

 }

 static PEP_STATUS prepare_updated_identity(PEP_SESSION session,

                                                  pEp_identity* return_id,

                                                  pEp_identity* stored_ident,

                                                  bool store) {

     if (!session || !return_id || !stored_ident)

         return PEP_ILLEGAL_VALUE;

     PEP_STATUS status;

     bool is_identity_default, is_user_default, is_address_default;

     status = get_valid_pubkey(session, stored_ident,

                                 &is_identity_default,

                                 &is_user_default,

                                 &is_address_default,

                               false);

     if (status == PEP_STATUS_OK && stored_ident->fpr && *(stored_ident->fpr) != '\0') {

     // set identity comm_type from trust db (user_id, FPR)

         status = get_trust(session, stored_ident);

         if (status == PEP_CANNOT_FIND_IDENTITY || stored_ident->comm_type == PEP_ct_unknown) {

             // This is OK - there is no trust DB entry, but we

             // found a key. We won't store this, but we'll

             // use it.

             PEP_comm_type ct = PEP_ct_unknown;

             status = get_key_rating(session, stored_ident->fpr, &ct);

             stored_ident->comm_type = ct;

         }

     }

     else {

         if (stored_ident->comm_type == PEP_ct_unknown)

             stored_ident->comm_type = PEP_ct_key_not_found;

     }

     free(return_id->fpr);

     return_id->fpr = NULL;

     if (status == PEP_STATUS_OK && !EMPTYSTR(stored_ident->fpr))

         return_id->fpr = strdup(stored_ident->fpr);

     return_id->comm_type = stored_ident->comm_type;

     // We patch the DB with the input username, but if we didn't have

     // one, we pull it out of storage if available.

     // (also, if the input username is "anonymous" and there exists

     //  a DB username, we replace)

     if (!EMPTYSTR(stored_ident->username)) {

         if (!EMPTYSTR(return_id->username) && 

             (strcasecmp(return_id->username, return_id->address) == 0)) {

             free(return_id->username);

             return_id->username = NULL;

         }

         if (EMPTYSTR(return_id->username)) {

             free(return_id->username);

             return_id->username = strdup(stored_ident->username);

         }

     }

     else {

         if (EMPTYSTR(return_id->username))

             return_id->username = strdup(return_id->address);

     }

     return_id->me = stored_ident->me;

     // FIXME: Do we ALWAYS do this? We probably should...

     if (EMPTYSTR(return_id->user_id)) {

         free(return_id->user_id);

         return_id->user_id = strdup(stored_ident->user_id);

     } 

     adjust_pEp_trust_status(session, return_id);

     // Call set_identity() to store

     if ((is_identity_default || is_user_default) &&

          is_address_default) {                 

          // if we got an fpr which is default for either user

          // or identity AND is valid for this address, set in DB

          // as default

          status = set_identity(session, return_id);

     }

     else {

         // Store without default fpr/ct, but return the fpr and ct 

         // for current use

         char* save_fpr = return_id->fpr;

         PEP_comm_type save_ct = return_id->comm_type;

         return_id->fpr = NULL;

         return_id->comm_type = PEP_ct_unknown;

         PEP_STATUS save_status = status;

         status = set_identity(session, return_id);

         if (save_status != PEP_STATUS_OK)

             status = save_status;

         return_id->fpr = save_fpr;

         return_id->comm_type = save_ct;

     }

     transfer_ident_lang_and_flags(return_id, stored_ident);

     if (return_id->comm_type == PEP_ct_unknown)

         return_id->comm_type = PEP_ct_key_not_found;

     return status;

 }

 DYNAMIC_API PEP_STATUS update_identity(

         PEP_SESSION session, pEp_identity * identity

     )

 {

     PEP_STATUS status;

     assert(session);

     assert(identity);

     assert(!EMPTYSTR(identity->address));

     if (!(session && identity && !EMPTYSTR(identity->address)))

         return PEP_ILLEGAL_VALUE;

     char* default_own_id = NULL;

     status = get_default_own_userid(session, &default_own_id);    

     bool is_own_user = identity->me;

     // Is this me, temporary or not? If so, BAIL.    

     if (!is_own_user) {

         if (default_own_id) {

             if (!EMPTYSTR(identity->user_id)) {

                 if (strcmp(default_own_id, identity->user_id) == 0) {

                     is_own_user = true;

                 }

                 else {

                     char* alias = NULL;

                     if (get_userid_alias_default(session, identity->user_id, &alias) == PEP_STATUS_OK) {

                         if (alias && strcmp(default_own_id, alias) == 0)

                             is_own_user = true;

                         free(alias);    

                     }

                 }

             }

             else {

                 // Check if own address. For now, this is a special case;

                 // we try to require apps to send in user_ids, but must prevent

                 // writes to an own identity from within THIS function

                 // NOTE: These semantics MAY CHANGE.

                 bool _own_addr = false;

                 is_own_address(session, identity->address, &_own_addr);

                 // N.B. KB: I would prefer consistent semantics here - that is to say,

                 // we also set is_own_user here and force PEP_ILLEGAL_VALUE                

                 if (_own_addr) {

                     free(identity->user_id);

                     identity->user_id = strdup(default_own_id);

                     return _myself(session, identity, false, false, true);

                 }    

             }

         }

         // Otherwise, we don't even HAVE an own user yet, so we're ok.

     }    

     if (is_own_user)

     {

         free(default_own_id);

         return PEP_ILLEGAL_VALUE;

     }

     // We have, at least, an address.

     // Retrieve stored identity information!    

     pEp_identity* stored_ident = NULL;

     if (!EMPTYSTR(identity->user_id)) {            

         // (we're gonna update the trust/fpr anyway, so we use the no-fpr-from-trust-db variant)

         //      * do get_identity() to retrieve stored identity information

         status = get_identity_without_trust_check(session, identity->address, identity->user_id, &stored_ident);

         // Before we start - if there was no stored identity, we should check to make sure we don't

         // have a stored identity with a temporary user_id that differs from the input user_id. This

         // happens in multithreaded environments sometimes.

         if (!stored_ident) {

             identity_list* id_list = NULL;

             status = get_identities_by_address(session, identity->address, &id_list);

             if (id_list) {

                 identity_list* id_curr = id_list;

                 bool input_is_TOFU = (strstr(identity->user_id, "TOFU_") == identity->user_id);

                 while (id_curr) {

                     pEp_identity* this_id = id_curr->ident;

                     if (this_id) {

                         char* this_uid = this_id->user_id;

                         bool curr_is_TOFU = false;

                         // this_uid should never be NULL, as this is half of the ident

                         // DB primary key

                         assert(!EMPTYSTR(this_uid));

                         curr_is_TOFU = (strstr(this_uid, "TOFU_") == this_uid);

                         if (curr_is_TOFU && !input_is_TOFU) {

                             // FIXME: should we also be fixing pEp_own_userId in this

                             // function here?

                             // if usernames match, we replace the userid. Or if the temp username

                             // is anonymous.

                             // FIXME: do we need to create an address match function which

                             // matches the whole dot-and-case rigamarole from 

                             if (EMPTYSTR(this_id->username) ||

                                 strcasecmp(this_id->username, this_id->address) == 0 ||

                                 (identity->username && 

                                  strcasecmp(identity->username, 

                                             this_id->username) == 0)) {

                                 // Ok, we have a temp ID. We have to replace this

                                 // with the real ID.

                                 status = replace_userid(session, 

                                                         this_uid, 

                                                         identity->user_id);

                                 if (status != PEP_STATUS_OK) {

                                     free_identity_list(id_list);

                                     free(default_own_id);

                                     return status;

                                 }

                                 free(this_uid);

                                 this_uid = NULL;

                                 // Reflect the change we just made to the DB

                                 this_id->user_id = strdup(identity->user_id);

                                 stored_ident = this_id;

                                 // FIXME: free list.

                                 break;                                

                             }

                         }

                         else if (input_is_TOFU && !curr_is_TOFU) {

                             // Replace ruthlessly - this is NOT supposed to happen.

                             // BAD APP BEHAVIOUR.

                             free(identity->user_id);

                             identity->user_id = strdup(this_id->user_id);

                             stored_ident = this_id;

                             // FIXME: free list.

                             break;                                

                         }                            

                     }

                     id_curr = id_curr->next;

                 }

             }

         } 

         if (status == PEP_STATUS_OK && stored_ident) { 

             //  * if identity available

             //      * patch it with username

             //          (note: this will happen when 

             //           setting automatically below...)

             //      * elect valid key for identity

             //    * if valid key exists

             //        * set return value's fpr

             status = prepare_updated_identity(session,

                                               identity,

                                               stored_ident, true);

         }

         //  * else (identity unavailable)

         else {

             status = PEP_STATUS_OK;

             // FIXME: We may need to roll this back.

             // FIXME: change docs if we don't

             //  if we only have user_id and address and identity not available

             //      * return error status (identity not found)

             if (EMPTYSTR(identity->username)) {

                 free(identity->username);

                 identity->username = strdup(identity->address);

             }

             // Otherwise, if we had user_id, address, and username:

             //    * create identity with user_id, address, username

             //      (this is the input id without the fpr + comm type!)

             elect_pubkey(session, identity, false);

             //    * We've already checked and retrieved

             //      any applicable temporary identities above. If we're 

             //      here, none of them fit.

             //    * call set_identity() to store

             // FIXME: Do we set if we had to copy in the address?

             adjust_pEp_trust_status(session, identity);

             status = set_identity(session, identity);

             //  * Return: created identity

         }        

     }

     else if (!EMPTYSTR(identity->username)) {

         /*

          * Temporary identity information with username supplied

             * Input: address, username (no others)

          */

         //  * See if there is an own identity that uses this address. If so, we'll

         //    prefer that

         stored_ident = NULL;

         if (default_own_id) {

             status = get_identity(session, 

                                   identity->address, 

                                   default_own_id, 

                                   &stored_ident);

         }

         // If there isn't an own identity, search for a non-temp stored ident

         // with this address.                      

         if (status == PEP_CANNOT_FIND_IDENTITY || !stored_ident) { 

             identity_list* id_list = NULL;

             status = get_identities_by_address(session, identity->address, &id_list);

             if (id_list) {

                 identity_list* id_curr = id_list;

                 while (id_curr) {

                     pEp_identity* this_id = id_curr->ident;

                     if (this_id) {

                         char* this_uid = this_id->user_id;

                         assert(!EMPTYSTR(this_uid));

                         // Should never be NULL - DB primary key

                         if (strstr(this_uid, "TOFU_") != this_uid) {

                             // if usernames match, we replace the userid.

                             if (identity->username && 

                                 strcasecmp(identity->username, 

                                            this_id->username) == 0) {

                                 // Ok, we have a real ID. Copy it!

                                 identity->user_id = strdup(this_uid);

                                 assert(identity->user_id);

                                 if (!identity->user_id)

                                     goto enomem;

                                 stored_ident = this_id;

                                 break;                                

                             }                            

                         } 

                     }

                     id_curr = id_curr->next;

                 }

             }

         }

         if (stored_ident) {

             status = prepare_updated_identity(session,

                                               identity,

                                               stored_ident, true);

         }

         else {

             identity->user_id = calloc(1, strlen(identity->address) + 6);

             if (!identity->user_id)

                 goto enomem;

             snprintf(identity->user_id, strlen(identity->address) + 6,

                      "TOFU_%s", identity->address);        

             status = get_identity(session, 

                                   identity->address, 

                                   identity->user_id, 

                                   &stored_ident);

             if (status == PEP_STATUS_OK && stored_ident) {

                 status = prepare_updated_identity(session,

                                                   identity,

                                                   stored_ident, true);

             }

             else {

                 //    * We've already checked and retrieved

                 //      any applicable temporary identities above. If we're 

                 //      here, none of them fit.

                 status = elect_pubkey(session, identity, false);

                 //    * call set_identity() to store

                 if (identity->fpr) {

                     // it is still possible we have DB information on this key. Better check.

                     status = get_trust(session, identity);

                     PEP_comm_type db_ct = identity->comm_type;

                     status = get_key_rating(session, identity->fpr, &identity->comm_type);

                     PEP_comm_type key_ct = identity->comm_type;

                     if (status == PEP_STATUS_OK) {

                         switch (key_ct) {

                             case PEP_ct_key_expired:

                                 if (db_ct == PEP_ct_key_expired_but_confirmed)

                                     identity->comm_type = db_ct;

                                 break;    

                             default:

                                 switch(db_ct) {

                                     case PEP_ct_key_expired_but_confirmed:

                                         if (key_ct >= PEP_ct_strong_but_unconfirmed)

                                             identity->comm_type |= PEP_ct_confirmed;

                                         break;

                                     case PEP_ct_mistrusted:

                                     case PEP_ct_compromised:

                                     case PEP_ct_key_b0rken:

                                         identity->comm_type = db_ct;

                                     default:

                                         break;

                                 }    

                                 break;

                         }

                     }

                 }

                 //    * call set_identity() to store

                 adjust_pEp_trust_status(session, identity);            

                 status = set_identity(session, identity);

             }

         }

     }

     else {

         /*

         * Input: address (no others)

          * Temporary identity information without username suplied

          */

         //  * Again, see if there is an own identity that uses this address. If so, we'll

         //    prefer that

         stored_ident = NULL;

         if (default_own_id) {

             status = get_identity(session, 

                                   identity->address, 

                                   default_own_id, 

                                   &stored_ident);

         }

         // If there isn't an own identity, search for a non-temp stored ident

         // with this address.                      

         if (status == PEP_CANNOT_FIND_IDENTITY || !stored_ident) { 

             identity_list* id_list = NULL;

             //    * Search for identity with this address

             status = get_identities_by_address(session, identity->address, &id_list);

             // Results are ordered by timestamp descending, so this covers

             // both the one-result and multi-result cases

             if (id_list) {

                 if (stored_ident) // unlikely

                     free_identity(stored_ident);

                 stored_ident = id_list->ident;

             }

         }

         if (stored_ident)

             status = prepare_updated_identity(session, identity,

                                               stored_ident, false);

         else  {            

             // too little info. BUT. We see if we can find a key; if so, we create a

             // temp identity, look for a key, and store.

             // create temporary identity, store it, and Return this

             // This means TOFU_ user_id

             identity->user_id = calloc(1, strlen(identity->address) + 6);

             if (!identity->user_id)

                 goto enomem;

             snprintf(identity->user_id, strlen(identity->address) + 6,

                      "TOFU_%s", identity->address);        

             identity->username = strdup(identity->address);

             if (!identity->address)

                 goto enomem;

             free(identity->fpr);

             identity->fpr = NULL;

             identity->comm_type = PEP_ct_unknown;

             status = elect_pubkey(session, identity, false);

             if (identity->fpr)

                 status = get_key_rating(session, identity->fpr, &identity->comm_type);

             //    * call set_identity() to store

             adjust_pEp_trust_status(session, identity);            

             status = set_identity(session, identity);

         }

     }

     // FIXME: This is legacy. I presume it's a notification for the caller...

     // Revisit once I can talk to Volker

     if (identity->comm_type != PEP_ct_compromised &&

         identity->comm_type < PEP_ct_strong_but_unconfirmed)

         if (session->examine_identity)

             session->examine_identity(identity, session->examine_management);

     goto pEp_free;

 enomem:

     status = PEP_OUT_OF_MEMORY;

 pEp_free:

     free(default_own_id);

     free_identity(stored_ident);

     return status;

 }

 PEP_STATUS elect_ownkey(

         PEP_SESSION session, pEp_identity * identity

     )

 {

     PEP_STATUS status;

     stringlist_t *keylist = NULL;

     free(identity->fpr);

     identity->fpr = NULL;

     status = find_private_keys(session, identity->address, &keylist);

     assert(status != PEP_OUT_OF_MEMORY);

     if (status == PEP_OUT_OF_MEMORY)

         return PEP_OUT_OF_MEMORY;

     if (keylist != NULL && keylist->value != NULL)

     {

         char *_fpr = NULL;

         identity->comm_type = PEP_ct_unknown;

         stringlist_t *_keylist;

         for (_keylist = keylist; _keylist && _keylist->value; _keylist = _keylist->next) {

             bool is_own = false;

             status = own_key_is_listed(session, _keylist->value, &is_own);

             assert(status == PEP_STATUS_OK);

             if (status != PEP_STATUS_OK) {

                 free_stringlist(keylist);

                 return status;

             }

             if (is_own)

             {

                 PEP_comm_type _comm_type_key;

                 status = get_key_rating(session, _keylist->value, &_comm_type_key);

                 assert(status != PEP_OUT_OF_MEMORY);

                 if (status == PEP_OUT_OF_MEMORY) {

                     free_stringlist(keylist);

                     return PEP_OUT_OF_MEMORY;

                 }

                 if (_comm_type_key != PEP_ct_compromised &&

                     _comm_type_key != PEP_ct_unknown)

                 {

                     if (identity->comm_type == PEP_ct_unknown ||

                         _comm_type_key > identity->comm_type)

                     {

                         identity->comm_type = _comm_type_key;

                         _fpr = _keylist->value;

                     }

                 }

             }

         }

         if (_fpr)

         {

             identity->fpr = strdup(_fpr);

             assert(identity->fpr);

             if (identity->fpr == NULL)

             {

                 free_stringlist(keylist);

                 return PEP_OUT_OF_MEMORY;

             }

         }

         free_stringlist(keylist);

     }

     return PEP_STATUS_OK;

 }

 PEP_STATUS _has_usable_priv_key(PEP_SESSION session, char* fpr,

                                 bool* is_usable) {

     bool has_private = false;

     PEP_STATUS status = contains_priv_key(session, fpr, &has_private);

     *is_usable = has_private;

     return status;

 }

 PEP_STATUS _myself(PEP_SESSION session, 

                    pEp_identity * identity, 

                    bool do_keygen, 

                    bool ignore_flags,

                    bool read_only)

 {

     PEP_STATUS status;

     assert(session);

     assert(identity);

     assert(!EMPTYSTR(identity->address));

     assert(!EMPTYSTR(identity->user_id));

     if (!session || !identity || EMPTYSTR(identity->address) ||

         EMPTYSTR(identity->user_id))

         return PEP_ILLEGAL_VALUE;

     pEp_identity *stored_identity = NULL;

     char* revoked_fpr = NULL; 

     bool valid_key_found = false;

     char* default_own_id = NULL;

     status = get_default_own_userid(session, &default_own_id);

     // Deal with non-default user_ids.

     // FIXME: if non-default and read-only, reject totally?

     if (default_own_id && strcmp(default_own_id, identity->user_id) != 0) {

         if (read_only) {

             free(identity->user_id);

             identity->user_id = strdup(default_own_id);

         }

         else {

             status = set_userid_alias(session, default_own_id, identity->user_id);

             // Do we want this to be fatal? For now, we'll do it...

             if (status != PEP_STATUS_OK)

                 goto pEp_free;

             free(identity->user_id);

             identity->user_id = strdup(default_own_id);

             if (identity->user_id == NULL) {

                 status = PEP_OUT_OF_MEMORY;

                 goto pEp_free;

             }

         }

     }

     // NOTE: IF WE DON'T YET HAVE AN OWN_ID, WE IGNORE REFERENCES TO THIS ADDRESS IN THE

     // DB (WHICH MAY HAVE BEEN SET BEFORE MYSELF WAS CALLED BY RECEIVING AN EMAIL FROM

     // THIS ADDRESS), AS IT IS NOT AN OWN_IDENTITY AND HAS NO INFORMATION WE NEED OR WHAT TO

     // SET FOR MYSELF

     // Ok, so now, set up the own_identity:

     identity->comm_type = PEP_ct_pEp;

     identity->me = true;

     if(ignore_flags)

         identity->flags = 0;

     // Let's see if we have an identity record in the DB for 

     // this user_id + address

 //    DEBUG_LOG("myself", "debug", identity->address);

     status = get_identity(session,

                           identity->address,

                           identity->user_id,

                           &stored_identity);

     assert(status != PEP_OUT_OF_MEMORY);

     if (status == PEP_OUT_OF_MEMORY) {

         status = PEP_OUT_OF_MEMORY;

         goto pEp_free;

     }

     // Set usernames - priority is input username > stored name > address

     // If there's an input username, we always patch the username with that

     // input.

     if (EMPTYSTR(identity->username) || read_only) {

         bool stored_uname = (stored_identity && !EMPTYSTR(stored_identity->username));

         char* uname = (stored_uname ? stored_identity->username : identity->address);

         free(identity->username);

         identity->username = strdup(uname);

         if (identity->username == NULL) {

             status = PEP_OUT_OF_MEMORY;

             goto pEp_free;

         }

     }

     // ignore input fpr

     if (identity->fpr) {

         free(identity->fpr);

         identity->fpr = NULL;

     }

     // check stored identity

     if (stored_identity) {

         if (!EMPTYSTR(stored_identity->fpr)) {

             // Fall back / retrieve

             status = validate_fpr(session, stored_identity, false, true);

             if (status == PEP_OUT_OF_MEMORY)

                 goto pEp_free;

             if (status == PEP_STATUS_OK) {

                 if (stored_identity->comm_type >= PEP_ct_strong_but_unconfirmed) {

                     identity->fpr = strdup(stored_identity->fpr);

                     assert(identity->fpr);

                     if (!identity->fpr) {

                         status = PEP_OUT_OF_MEMORY;

                         goto pEp_free;

                     }

                     valid_key_found = true;            

                 }

                 else {

                     bool revoked = false;

                     status = key_revoked(session, stored_identity->fpr, &revoked);

                     if (status)

                         goto pEp_free;

                     if (revoked) {

                         revoked_fpr = strdup(stored_identity->fpr);

                         assert(revoked_fpr);

                         if (!revoked_fpr) {

                             status = PEP_OUT_OF_MEMORY;

                             goto pEp_free;

                         }

                     }

                 }

             }

         }

         // reconcile language, flags

         transfer_ident_lang_and_flags(identity, stored_identity);

     }

     // Nothing left to do but generate a key

     if (!valid_key_found) {

         if (!do_keygen || read_only)

             status = PEP_GET_KEY_FAILED;

         else {

 // /            DEBUG_LOG("Generating key pair", "debug", identity->address);

             free(identity->fpr);

             identity->fpr = NULL;

             status = generate_keypair(session, identity);

             assert(status != PEP_OUT_OF_MEMORY);

             if (status != PEP_STATUS_OK) {

                 char buf[11];

                 snprintf(buf, 11, "%d", status); // uh, this is kludgey. FIXME

 //                DEBUG_LOG("Generating key pair failed", "debug", buf);

             }        

             else {

                 valid_key_found = true;

                 if (revoked_fpr) {

                     status = set_revoked(session, revoked_fpr,

                                          stored_identity->fpr, time(NULL));

                     assert(status == PEP_STATUS_OK);                     

                 }

             }

         }

     }

     if (valid_key_found) {

         identity->comm_type = PEP_ct_pEp;

         status = PEP_STATUS_OK;

     }

     else {

         free(identity->fpr);

         identity->fpr = NULL;

         identity->comm_type = PEP_ct_unknown;

     }

     // We want to set an identity in the DB even if a key isn't found, but we have to preserve the status if

     // it's NOT ok

     if (!read_only) {

         PEP_STATUS set_id_status = set_identity(session, identity);

         if (set_id_status == PEP_STATUS_OK)

             set_id_status = set_as_pEp_user(session, identity);

         status = (status == PEP_STATUS_OK ? set_id_status : status);

     }

 pEp_free:    

     free(default_own_id);

     free(revoked_fpr);                     

     free_identity(stored_identity);

     return status;

 }

 DYNAMIC_API PEP_STATUS myself(PEP_SESSION session, pEp_identity * identity)

 {

     return _myself(session, identity, true, false, false);

 }

 DYNAMIC_API PEP_STATUS register_examine_function(

         PEP_SESSION session, 

         examine_identity_t examine_identity,

         void *management

     )

 {

     assert(session);

     if (!session)

         return PEP_ILLEGAL_VALUE;

     session->examine_management = management;

     session->examine_identity = examine_identity;

     return PEP_STATUS_OK;

 }

 DYNAMIC_API PEP_STATUS do_keymanagement(

         retrieve_next_identity_t retrieve_next_identity,

         void *management

     )

 {

     PEP_SESSION session;

     pEp_identity *identity;

     PEP_STATUS status = init(&session, NULL, NULL);

     assert(!status);

     if (status)

         return status;

     assert(session && retrieve_next_identity);

     if (!(session && retrieve_next_identity))

         return PEP_ILLEGAL_VALUE;

     log_event(session, "keymanagement thread started", "pEp engine", NULL, NULL);

     while ((identity = retrieve_next_identity(management))) 

     {

         assert(identity->address);

         if(identity->address)

         {

             DEBUG_LOG("do_keymanagement", "retrieve_next_identity", identity->address);

             if (identity->me) {

                 status = myself(session, identity);

             } else {

                 status = recv_key(session, identity->address);

             }

             assert(status != PEP_OUT_OF_MEMORY);

             if(status == PEP_OUT_OF_MEMORY)

                 return PEP_OUT_OF_MEMORY;

         }

         free_identity(identity);

     }

     log_event(session, "keymanagement thread shutdown", "pEp engine", NULL, NULL);

     release(session);

     return PEP_STATUS_OK;

 }

 DYNAMIC_API PEP_STATUS key_mistrusted(

         PEP_SESSION session,

         pEp_identity *ident

     )

 {

     PEP_STATUS status = PEP_STATUS_OK;

     assert(session);

     assert(ident);

     assert(!EMPTYSTR(ident->fpr));

     if (!(session && ident && ident->fpr))

         return PEP_ILLEGAL_VALUE;

     bool has_private = false;

     status = contains_priv_key(session, ident->fpr, &has_private);        

     if (status != PEP_STATUS_OK && status != PEP_KEY_NOT_FOUND)

         return status;

     // See if key is revoked already

     if (has_private) {

         bool revoked = false;

         status = key_revoked(session, ident->fpr, &revoked);

         if (!revoked)

             revoke_key(session, ident->fpr, NULL);

     }            

     // double-check to be sure key is even in the DB

     if (ident->fpr)

         status = set_pgp_keypair(session, ident->fpr);

     // We set this temporarily but will grab it back from the cache afterwards

     ident->comm_type = PEP_ct_mistrusted;

     status = set_trust(session, ident);

     if (status == PEP_STATUS_OK)

         // cascade that mistrust for anyone using this key

         status = mark_as_compromised(session, ident->fpr);

     if (status == PEP_STATUS_OK)

         status = add_mistrusted_key(session, ident->fpr);

     return status;

 }

 DYNAMIC_API PEP_STATUS key_reset_trust(

         PEP_SESSION session,

         pEp_identity *ident

     )

 {

     PEP_STATUS status = PEP_STATUS_OK;

     assert(session);

     assert(ident);

     assert(!EMPTYSTR(ident->fpr));

     assert(!EMPTYSTR(ident->address));

     assert(!EMPTYSTR(ident->user_id));

     if (!(session && ident && ident->fpr && ident->fpr[0] != '\0' && ident->address &&

             ident->user_id))

         return PEP_ILLEGAL_VALUE;

     // we do not change the input struct at ALL.

     pEp_identity* input_copy = identity_dup(ident);

     pEp_identity* tmp_ident = NULL;

     status = get_trust(session, input_copy);

     if (status != PEP_STATUS_OK)

         goto pEp_free;

     PEP_comm_type new_trust = PEP_ct_unknown;

     status = get_key_rating(session, ident->fpr, &new_trust);

     if (status != PEP_STATUS_OK)

         goto pEp_free;

     bool pEp_user = false;

     status = is_pEp_user(session, ident, &pEp_user);

     if (pEp_user && new_trust >= PEP_ct_unconfirmed_encryption)

         input_copy->comm_type = PEP_ct_pEp_unconfirmed;

     else

         input_copy->comm_type = new_trust;

     status = set_trust(session, input_copy);

     if (status != PEP_STATUS_OK)

         goto pEp_free;

     bool mistrusted_key = false;

     status = is_mistrusted_key(session, ident->fpr, &mistrusted_key);

     if (status != PEP_STATUS_OK)

         goto pEp_free;

     if (mistrusted_key)

         status = delete_mistrusted_key(session, ident->fpr);

     if (status != PEP_STATUS_OK)

         goto pEp_free;

     tmp_ident = new_identity(ident->address, NULL, ident->user_id, NULL);

     if (!tmp_ident)

         return PEP_OUT_OF_MEMORY;

     if (is_me(session, tmp_ident))

         status = myself(session, tmp_ident);

     else

         status = update_identity(session, tmp_ident);

     if (status != PEP_STATUS_OK)

         goto pEp_free;

     // remove as default if necessary

     if (!EMPTYSTR(tmp_ident->fpr) && strcmp(tmp_ident->fpr, ident->fpr) == 0) {

         free(tmp_ident->fpr);

         tmp_ident->fpr = NULL;

         tmp_ident->comm_type = PEP_ct_unknown;

         status = set_identity(session, tmp_ident);

         if (status != PEP_STATUS_OK)

             goto pEp_free;

     }

     char* user_default = NULL;

     get_main_user_fpr(session, tmp_ident->user_id, &user_default);

     if (!EMPTYSTR(user_default)) {

         if (strcmp(user_default, ident->fpr) == 0)

             status = refresh_userid_default_key(session, ident->user_id);

         if (status != PEP_STATUS_OK)

             goto pEp_free;    

     }

 pEp_free:

     free_identity(tmp_ident);

     free_identity(input_copy);

     return status;

 }

 DYNAMIC_API PEP_STATUS trust_personal_key(

         PEP_SESSION session,

         pEp_identity *ident

     )

 {

     PEP_STATUS status = PEP_STATUS_OK;

     assert(session);

     assert(ident);

     assert(!EMPTYSTR(ident->address));

     assert(!EMPTYSTR(ident->user_id));

     assert(!EMPTYSTR(ident->fpr));

     if (!ident || EMPTYSTR(ident->address) || EMPTYSTR(ident->user_id) ||

             EMPTYSTR(ident->fpr))

         return PEP_ILLEGAL_VALUE;

     if (is_me(session, ident))

         return PEP_ILLEGAL_VALUE;

     char* ident_default_fpr = NULL;

     // Before we do anything, be sure the input fpr is even eligible to be trusted

     PEP_comm_type input_default_ct = PEP_ct_unknown;

     status = get_key_rating(session, ident->fpr, &input_default_ct);

     if (input_default_ct < PEP_ct_strong_but_unconfirmed)

         return PEP_KEY_UNSUITABLE;

     status = set_pgp_keypair(session, ident->fpr);

     if (status != PEP_STATUS_OK)

         return status;

     pEp_identity* ident_copy = identity_dup(ident);

     char* cached_fpr = NULL;

     // for setting up a temp trusted identity for the input fpr

     pEp_identity* tmp_id = NULL;

     // For later, in case we need to check the user default key

     pEp_identity* tmp_user_ident = NULL;

     // Save the input fpr, which we already tested as non-NULL

     cached_fpr = strdup(ident->fpr);

     // Set up a temp trusted identity for the input fpr without a comm type;

     tmp_id = new_identity(ident->address, ident->fpr, ident->user_id, NULL);

     status = validate_fpr(session, tmp_id, false, true);

     if (status == PEP_STATUS_OK) {

         // Validate fpr gets trust DB or, when that fails, key comm type. we checked

         // above that the key was ok. (not revoked or expired), but we want the max.

         tmp_id->comm_type = _MAX(tmp_id->comm_type, input_default_ct) | PEP_ct_confirmed;

         // Get the default identity without setting the fpr                                       

         status = update_identity(session, ident_copy);

         ident_default_fpr = (EMPTYSTR(ident_copy->fpr) ? NULL : strdup(ident_copy->fpr));

         if (status == PEP_STATUS_OK) {

             bool trusted_default = false;

             // If there's no default, or the default is different from the input...

             if (EMPTYSTR(ident_default_fpr) || strcmp(cached_fpr, ident_default_fpr) != 0) {

                 // If the default fpr (if there is one) is trusted and key is strong enough,

                 // don't replace, we just set the trusted bit on this key for this user_id...

                 // (If there's no default fpr, this won't be true anyway.)

                 if ((ident_copy->comm_type >= PEP_ct_strong_but_unconfirmed && 

                     (ident_copy->comm_type & PEP_ct_confirmed))) {                        

                     trusted_default = true;

                     status = set_trust(session, tmp_id);

                     input_default_ct = tmp_id->comm_type;                    

                 }

                 else {

                     free(ident_copy->fpr);

                     ident_copy->fpr = strdup(cached_fpr);

                     ident_copy->comm_type = tmp_id->comm_type;

                     status = set_identity(session, ident_copy); // replace identity default

                     if (status == PEP_STATUS_OK) {

                         if ((ident_copy->comm_type | PEP_ct_confirmed) == PEP_ct_pEp)

                             status = set_as_pEp_user(session, ident_copy);

                     }            

                 }

             }

             else { // we're setting this on the default fpr

                 ident->comm_type = tmp_id->comm_type;

                 status = set_identity(session, ident);

                 trusted_default = true;

             }

             if (status == PEP_STATUS_OK && !trusted_default) {

                 // Ok, there wasn't a trusted default, so we replaced. Thus, we also

                 // make sure there's a trusted default on the user_id. If there

                 // is not, we make this the default.

                 char* user_default = NULL;

                 status = get_main_user_fpr(session, ident->user_id, &user_default);

                 if (status == PEP_STATUS_OK && user_default) {

                     tmp_user_ident = new_identity(ident->address, 

                                                   user_default, 

                                                   ident->user_id, 

                                                   NULL);

                     if (!tmp_user_ident)

                         status = PEP_OUT_OF_MEMORY;

                     else {

                         status = validate_fpr(session, tmp_user_ident, false, true);

                         if (status != PEP_STATUS_OK ||

                             tmp_user_ident->comm_type < PEP_ct_strong_but_unconfirmed ||

                             !(tmp_user_ident->comm_type & PEP_ct_confirmed)) 

                         {

                             char* trusted_fpr = (trusted_default ? ident_default_fpr : cached_fpr);

                             status = replace_main_user_fpr(session, ident->user_id, trusted_fpr);

                         } 

                     }

                 }

             }

         }

     }    

     free(ident_default_fpr);

     free(cached_fpr);

     free_identity(tmp_id);

     free_identity(ident_copy);

     free_identity(tmp_user_ident);

     return status;

 }

 DYNAMIC_API PEP_STATUS trust_own_key(

         PEP_SESSION session,

         pEp_identity* ident

     ) 

 {

     assert(session);

     assert(ident);

     assert(!EMPTYSTR(ident->address));

     assert(!EMPTYSTR(ident->user_id));

     assert(!EMPTYSTR(ident->fpr));

     if (!ident || EMPTYSTR(ident->address) || EMPTYSTR(ident->user_id) ||

             EMPTYSTR(ident->fpr))

         return PEP_ILLEGAL_VALUE;

     if (!is_me(session, ident))

         return PEP_ILLEGAL_VALUE;

     // don't check blacklist or require a private key

     PEP_STATUS status = validate_fpr(session, ident, false, false);

     if (status != PEP_STATUS_OK)

         return status;

     status = set_pgp_keypair(session, ident->fpr);

     if (status != PEP_STATUS_OK)

         return status;

     if (ident->comm_type < PEP_ct_strong_but_unconfirmed)

         return PEP_KEY_UNSUITABLE;

     ident->comm_type |= PEP_ct_confirmed;

     status = set_trust(session, ident);

     return status;

 }

 DYNAMIC_API PEP_STATUS own_key_is_listed(

         PEP_SESSION session,

         const char *fpr,

         bool *listed

     )

 {

     PEP_STATUS status = PEP_STATUS_OK;

     int count;

     assert(session && fpr && fpr[0] && listed);

     if (!(session && fpr && fpr[0] && listed))

         return PEP_ILLEGAL_VALUE;

     *listed = false;

     sqlite3_reset(session->own_key_is_listed);

     sqlite3_bind_text(session->own_key_is_listed, 1, fpr, -1, SQLITE_STATIC);

     int result;

     result = sqlite3_step(session->own_key_is_listed);

     switch (result) {

         case SQLITE_ROW:

             count = sqlite3_column_int(session->own_key_is_listed, 0);

             *listed = count > 0;

             status = PEP_STATUS_OK;

             break;

         default:

             status = PEP_UNKNOWN_ERROR;

     }

     sqlite3_reset(session->own_key_is_listed);

     return status;

 }

 PEP_STATUS _own_identities_retrieve(

         PEP_SESSION session,

         identity_list **own_identities,

         identity_flags_t excluded_flags

       )

 {

     PEP_STATUS status = PEP_STATUS_OK;

     assert(session && own_identities);

     if (!(session && own_identities))

         return PEP_ILLEGAL_VALUE;

     *own_identities = NULL;

     identity_list *_own_identities = new_identity_list(NULL);

     if (_own_identities == NULL)

         goto enomem;

     sqlite3_reset(session->own_identities_retrieve);

     int result;

     // address, fpr, username, user_id, comm_type, lang, flags

     const char *address = NULL;

     const char *fpr = NULL;

     const char *username = NULL;

     const char *user_id = NULL;

     PEP_comm_type comm_type = PEP_ct_unknown;

     const char *lang = NULL;

     unsigned int flags = 0;

     identity_list *_bl = _own_identities;

     sqlite3_bind_int(session->own_identities_retrieve, 1, excluded_flags);

     do {

         result = sqlite3_step(session->own_identities_retrieve);

         switch (result) {

             case SQLITE_ROW:

                 address = (const char *)

                     sqlite3_column_text(session->own_identities_retrieve, 0);

                 fpr = (const char *)

                     sqlite3_column_text(session->own_identities_retrieve, 1);

                 user_id = (const char *)

                     sqlite3_column_text(session->own_identities_retrieve, 2);

                 username = (const char *)

                     sqlite3_column_text(session->own_identities_retrieve, 3);

                 comm_type = PEP_ct_pEp;

                 lang = (const char *)

                     sqlite3_column_text(session->own_identities_retrieve, 4);

                 flags = (unsigned int)

                     sqlite3_column_int(session->own_identities_retrieve, 5);

                 pEp_identity *ident = new_identity(address, fpr, user_id, username);

                 if (!ident)

                     goto enomem;

                 ident->comm_type = comm_type;

                 if (lang && lang[0]) {

                     ident->lang[0] = lang[0];

                     ident->lang[1] = lang[1];

                     ident->lang[2] = 0;

                 }

                 ident->me = true;

                 ident->flags = flags;

                 _bl = identity_list_add(_bl, ident);

                 if (_bl == NULL) {

                     free_identity(ident);

                     goto enomem;

                 }

                 break;

             case SQLITE_DONE:

                 break;

             default:

                 status = PEP_UNKNOWN_ERROR;

                 result = SQLITE_DONE;

         }

     } while (result != SQLITE_DONE);

     sqlite3_reset(session->own_identities_retrieve);

     if (status == PEP_STATUS_OK)

         *own_identities = _own_identities;

     else

         free_identity_list(_own_identities);

     goto the_end;

 enomem:

     free_identity_list(_own_identities);

     status = PEP_OUT_OF_MEMORY;

 the_end:

     return status;

 }

 DYNAMIC_API PEP_STATUS own_identities_retrieve(

         PEP_SESSION session,

         identity_list **own_identities

       )

 {

     return _own_identities_retrieve(session, own_identities, 0);

 }

 PEP_STATUS _own_keys_retrieve(

         PEP_SESSION session,

         stringlist_t **keylist,

         identity_flags_t excluded_flags,

         bool private_only

       )

 {

     PEP_STATUS status = PEP_STATUS_OK;

     assert(session && keylist);

     if (!(session && keylist))

         return PEP_ILLEGAL_VALUE;

     *keylist = NULL;

     stringlist_t *_keylist = NULL;

     sqlite3_reset(session->own_keys_retrieve);

     int result;

     char *fpr = NULL;

     stringlist_t *_bl = _keylist;

     sqlite3_bind_int(session->own_keys_retrieve, 1, excluded_flags);

     do {        

         result = sqlite3_step(session->own_keys_retrieve);

         switch (result) {

             case SQLITE_ROW:

                 _bl = stringlist_add(_bl, (const char *) sqlite3_column_text(session->own_keys_retrieve, 0));

                 if (_bl == NULL)

                     goto enomem;

                 if (_keylist == NULL)

                     _keylist = _bl;

                 break;

             case SQLITE_DONE:

                 break;

             default:

                 status = PEP_UNKNOWN_ERROR;

                 result = SQLITE_DONE;

         }

     } while (result != SQLITE_DONE);

     sqlite3_reset(session->own_keys_retrieve);

     if (status == PEP_STATUS_OK) {

         dedup_stringlist(_keylist);

         if (private_only) {

             stringlist_t* _kl = _keylist;

             stringlist_t* _kl_prev = NULL;

             while (_kl) {

                 bool has_private = false;

                 contains_priv_key(session, _kl->value, &has_private);

                 if (!has_private) {

                     stringlist_t* _kl_tmp = _kl;

                     if (_kl_prev)

                         _kl_prev->next = _kl->next;

                     else 

                         _keylist = _kl->next;

                     _kl = _kl->next;

                     _kl_tmp->next = NULL;

                     free_stringlist(_kl_tmp);

                     continue;

                 }

                 _kl_prev = _kl;

                 _kl = _kl->next;

             }

         }

         *keylist = _keylist;

     }

     else

         free_stringlist(_keylist);

     goto the_end;

 enomem:

     free_stringlist(_keylist);

     status = PEP_OUT_OF_MEMORY;

 the_end:

     return status;

 }

 DYNAMIC_API PEP_STATUS own_keys_retrieve(PEP_SESSION session, stringlist_t **keylist)

 {

     return _own_keys_retrieve(session, keylist, 0, true);

 }

 DYNAMIC_API PEP_STATUS set_own_key(

        PEP_SESSION session,

        pEp_identity *me,

        const char *fpr

     )

 {

     PEP_STATUS status = PEP_STATUS_OK;

     assert(session && me);

     assert(!EMPTYSTR(fpr));

     assert(!EMPTYSTR(me->address));

     assert(!EMPTYSTR(me->user_id));

     assert(!EMPTYSTR(me->username));

     if (!session || !me || EMPTYSTR(fpr) || EMPTYSTR(me->address) ||

             EMPTYSTR(me->user_id) || EMPTYSTR(me->username))

         return PEP_ILLEGAL_VALUE;

     status = _myself(session, me, false, true, false);

     // we do not need a valid key but dislike other errors

     if (status != PEP_STATUS_OK && status != PEP_GET_KEY_FAILED && status != PEP_KEY_UNSUITABLE)

         return status;

     status = PEP_STATUS_OK;

     bool private = false;

     status = contains_priv_key(session, fpr, &private);

     if (status != PEP_STATUS_OK)

         return status;

     if (!private)

         return PEP_KEY_UNSUITABLE;

     if (me->fpr)

         free(me->fpr);

     me->fpr = strdup(fpr);

     assert(me->fpr);

     if (!me->fpr)

         return PEP_OUT_OF_MEMORY;

     status = validate_fpr(session, me, false, true);

     if (status)

         return status;

     me->comm_type = PEP_ct_pEp;

     status = set_identity(session, me);

     return status;

 }

 PEP_STATUS contains_priv_key(PEP_SESSION session, const char *fpr,

                              bool *has_private) {

     assert(session);

     assert(fpr);

     assert(has_private);

     if (!(session && fpr && has_private))

         return PEP_ILLEGAL_VALUE;

     return session->cryptotech[PEP_crypt_OpenPGP].contains_priv_key(session, fpr, has_private);

 }

 PEP_STATUS add_mistrusted_key(PEP_SESSION session, const char* fpr)

 {

     int result;

     assert(!EMPTYSTR(fpr));

     if (!(session) || EMPTYSTR(fpr))

         return PEP_ILLEGAL_VALUE;

     sqlite3_reset(session->add_mistrusted_key);

     sqlite3_bind_text(session->add_mistrusted_key, 1, fpr, -1,

             SQLITE_STATIC);

     result = sqlite3_step(session->add_mistrusted_key);

     sqlite3_reset(session->add_mistrusted_key);

     if (result != SQLITE_DONE)

         return PEP_CANNOT_SET_PGP_KEYPAIR; // FIXME: Better status?

     return PEP_STATUS_OK;

 }

 PEP_STATUS delete_mistrusted_key(PEP_SESSION session, const char* fpr)

 {

     int result;

     assert(!EMPTYSTR(fpr));

     if (!(session) || EMPTYSTR(fpr))

         return PEP_ILLEGAL_VALUE;

     sqlite3_reset(session->delete_mistrusted_key);

     sqlite3_bind_text(session->delete_mistrusted_key, 1, fpr, -1,

             SQLITE_STATIC);

     result = sqlite3_step(session->delete_mistrusted_key);

     sqlite3_reset(session->delete_mistrusted_key);

     if (result != SQLITE_DONE)

         return PEP_UNKNOWN_ERROR; // FIXME: Better status?

     return PEP_STATUS_OK;

 }

 PEP_STATUS is_mistrusted_key(PEP_SESSION session, const char* fpr,

                              bool* mistrusted)

 {

     PEP_STATUS status = PEP_STATUS_OK;

     assert(session);

     assert(!EMPTYSTR(fpr));

     if (!(session && fpr))

         return PEP_ILLEGAL_VALUE;

     *mistrusted = false;

     sqlite3_reset(session->is_mistrusted_key);

     sqlite3_bind_text(session->is_mistrusted_key, 1, fpr, -1, SQLITE_STATIC);

     int result;

     result = sqlite3_step(session->is_mistrusted_key);

     switch (result) {

     case SQLITE_ROW:

         *mistrusted = sqlite3_column_int(session->is_mistrusted_key, 0);

         status = PEP_STATUS_OK;

         break;

     default:

         status = PEP_UNKNOWN_ERROR;

     }

     sqlite3_reset(session->is_mistrusted_key);

     return status;

 }

 #ifdef USE_GPG

 PEP_STATUS pgp_find_trusted_private_keys(

         PEP_SESSION session, stringlist_t **keylist

     );

 enum _pgp_thing {

     _pgp_none = 0,

     _pgp_fpr,

     _pgp_email,

     _pgp_name

 };

 static enum _pgp_thing _pgp_thing_next(enum _pgp_thing thing)

 {

     switch (thing) {

         case _pgp_fpr:

             return _pgp_email;

         case _pgp_email:

             return _pgp_name;

         case _pgp_name:

             return _pgp_fpr;

         default:

             return _pgp_fpr;

     }

 }

 PEP_STATUS pgp_import_ultimately_trusted_keypairs(PEP_SESSION session) {

     assert(session);

     if (!session)

         return PEP_ILLEGAL_VALUE;

     stringlist_t* priv_keylist = NULL;

     PEP_STATUS status = PEP_STATUS_OK;

     // 1. get keys

     status = pgp_find_trusted_private_keys(session, &priv_keylist);

     if (status)

         return status;

     pEp_identity *identity = NULL;

     stringlist_t *_sl;

     char *fpr = NULL;

     enum _pgp_thing thing = _pgp_none;

     for (_sl = priv_keylist; _sl && _sl->value; _sl = _sl->next) {

         thing = _pgp_thing_next(thing);

         switch (thing) {

             case _pgp_fpr:

                 // PEP_OWN_USERID is ok here because this is only run on first use!

                 identity = new_identity(NULL, NULL, PEP_OWN_USERID, NULL);

                 if (!identity) {

                     status = PEP_OUT_OF_MEMORY;

                     break;

                 }

                 identity->me = true;

                 fpr = strdup(_sl->value);

                 assert(fpr);

                 if (!fpr) {

                     status = PEP_OUT_OF_MEMORY;

                     free_identity(identity);

                 }

                 break;

             case _pgp_email:

                 assert(identity);

                 identity->address = strdup(_sl->value);

                 assert(identity->address);

                 if (!identity->address) {

                     status = PEP_OUT_OF_MEMORY;

                     free_identity(identity);

                 }

                 break;

             case _pgp_name:

                 assert(identity);

                 identity->username = strdup(_sl->value);

                 assert(identity->username);

                 if (!identity->username)

                     status = PEP_OUT_OF_MEMORY;

                 else

                     status = set_own_key(session, identity, fpr);

                 free_identity(identity);

                 identity = NULL;

                 break;

             default:

                 assert(0);

                 free_identity(identity);

                 status = PEP_UNKNOWN_ERROR;

         }

         if (status)

             break;

     }

     free_stringlist(priv_keylist);

     return status;

 }

 #endif // USE_GPG