adb: add support for vendor key directories.

Allow directories to be specified in ADB_VENDOR_KEYS. On Linux, monitor
this directory for new keys to be added.

Additionally, deduplicate keys by hashing their public key.

Bug: http://b/29273531
Bug: http://b/30927527
Change-Id: I8d3312b216b7f2c11900f2235f1f1b1d1c7aa767
Test: manually tested by adding a key to a directory, and verifying
      that devices became authorized after replugging.

1 files changed, 3 insertions, 2 deletions

diff --git a/transport.h b/transport.h
index d41c8bd..959681f 100644
--- a/transport.h
+++ b/transport.h
@@ -21,6 +21,7 @@
 
 #include <deque>
 #include <list>
+#include <memory>
 #include <string>
 #include <unordered_set>
 
@@ -107,7 +108,7 @@ public:
         return type == kTransportLocal && local_port_for_emulator_ == -1;
     }
 
-    RSA* NextKey();
+    std::shared_ptr<RSA> NextKey();
 
     unsigned char token[TOKEN_SIZE] = {};
     size_t failed_auth_attempts = 0;
@@ -160,7 +161,7 @@ private:
     // A list of adisconnect callbacks called when the transport is kicked.
     std::list<adisconnect*> disconnects_;
 
-    std::deque<RSA*> keys_;
+    std::deque<std::shared_ptr<RSA>> keys_;
 
     DISALLOW_COPY_AND_ASSIGN(atransport);
 };