diff --git a/tool/gpg-agent.py b/tool/gpg-agent.py
new file mode 100644
index 0000000..ae8528b
--- /dev/null
+++ b/tool/gpg-agent.py
@@ -0,0 +1,84 @@
+import platform, os, socket
+IS_WINDOWS=(platform.system() == 'Windows')
+
+BUFLEN=1024
+
+class gpg_agent(object):
+    def __init__(self):
+        if IS_WINDOWS:
+            home = os.getenv("HOME")
+            comm_port = os.path.join(home, "gnupg", "S.gpg-agent")
+            #
+            f = open(comm_port, "rb", 0)
+            infostr = f.read()
+            f.close()
+            #
+            info = infostr.split('\n', 1)
+            port = int(info[0])
+            nonce = info[1]
+            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+            s.connect(("localhost", port))
+            s.send(nonce)
+        else:
+            infostr = os.getenv("GPG_AGENT_INFO")
+            info = infostr.split(':', 2)
+            path = info[0]
+            s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+            s.connect(path)
+        self.sock = s
+        self.buf_remained = ""
+
+    def read_line(self):
+        line = ""
+        if self.buf_remained != "":
+            chunk = self.buf_remained
+        else:
+            chunk = self.sock.recv(BUFLEN)
+        while True:
+            pos = chunk.index('\n')
+            if pos >= 0:
+                self.buf_remained = chunk[pos+1:]
+                line = line + chunk[0:pos]
+                return line
+            else:
+                line = line + chunk
+                chunk = self.sock.recv(BUFLEN)
+
+    def send_command(self, cmd):
+        self.sock.send(cmd)
+
+    def get_response(self):
+        response = ""
+        while True:
+            while True:
+                l = self.read_line()
+                if l[0] != '#':
+                    break
+            if l[0] == 'D':
+                response += l[2:]
+            elif l[0] == 'O' and l[1] == 'K':
+                if response != "":
+                    return response
+                else:
+                    return True
+            elif l[0] == 'E' and l[1] == 'R' and l[2] == 'R':
+                return False
+            else:                    # XXX: S, INQUIRE, END
+                return False
+
+    def close(self):
+        self.sock.send('BYE\n')
+        bye = self.read_line()
+        self.sock.close()
+        return bye              # "OK closing connection"
+
+# Test
+g = gpg_agent()
+print g.read_line()
+g.send_command("KEYINFO --list --data\n")
+print g.get_response()
+g.send_command("READKEY 5D6C89682D07CCFC034AF508420BF2276D8018ED\n")
+r = g.get_response()
+import binascii
+print binascii.hexlify(r)
+print g.close()