adding blacklist test

src/pEpEngine.c

@@ -2,6 +2,7 @@
 #include "dynamic_api.h"
 #include "cryptotech.h"
 #include "transport.h"
+#include "blacklist.h"
 
 static int init_count = -1;
 
@@ -724,6 +725,15 @@ DYNAMIC_API PEP_STATUS set_identity(
                 identity->user_id && identity->username))
         return PEP_ILLEGAL_VALUE;
 
+    bool listed;
+    PEP_STATUS status = blacklist_is_listed(session, identity->fpr, &listed);
+    assert(status == PEP_STATUS_OK);
+    if (status != PEP_STATUS_OK)
+        return status;
+
+    if (listed)
+        return PEP_KEY_BLACKLISTED;
+
 	sqlite3_exec(session->db, "BEGIN ;", NULL, NULL, NULL);
 
 	sqlite3_reset(session->set_person);

src/pEpEngine.h

@@ -45,6 +45,7 @@ typedef enum {
 	PEP_CANNOT_SET_PGP_KEYPAIR						= 0x0382,
 	PEP_CANNOT_SET_IDENTITY							= 0x0383,
     PEP_CANNOT_SET_TRUST                            = 0x0384,
+    PEP_KEY_BLACKLISTED                             = 0x0385,
 	
 	PEP_UNENCRYPTED									= 0x0400,
 	PEP_VERIFIED									= 0x0401,
@@ -459,6 +460,7 @@ DYNAMIC_API PEP_STATUS get_identity(
 //		PEP_CANNOT_SET_PGP_KEYPAIR	    writing to table pgp_keypair failed
 //		PEP_CANNOT_SET_IDENTITY		    writing to table identity failed
 //		PEP_COMMIT_FAILED			    SQL commit failed
+//      PEP_KEY_BLACKLISTED             Key blacklisted, cannot set identity
 //
 //	caveat:
 //		in the identity structure you need to set the const char * fields to