diff --git a/README.md b/README.md
index c6285d058..e1dff4fa8 100755
--- a/README.md
+++ b/README.md
@@ -485,7 +485,8 @@ Supported operating systems and hardware:
 * 2013-10-17, Created.<br/>
 
 ## History
-* v2.0, 2014-11-28, fix [#215](https://github.com/winlinvip/simple-rtmp-server/issues/215), for bug #215, add srs_rtmp_dump tool. 2.0.37.
+* v2.0, 2014-11-29, fix [#235](https://github.com/winlinvip/simple-rtmp-server/issues/235), refine handshake, replace union with template method. 2.0.38.
+* v2.0, 2014-11-28, fix [#215](https://github.com/winlinvip/simple-rtmp-server/issues/215), add srs_rtmp_dump tool. 2.0.37.
 * v2.0, 2014-11-25, update PRIMARY, AUTHORS, CONTRIBUTORS rule. 2.0.32.
 * v2.0, 2014-11-24, fix [#212](https://github.com/winlinvip/simple-rtmp-server/issues/212), support publish aac adts raw stream. 2.0.31.
 * v2.0, 2014-11-22, fix [#217](https://github.com/winlinvip/simple-rtmp-server/issues/217), remove timeout recv, support 7.5k+ 250kbps clients. 2.0.30.
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index e7333f98e..4915c69ba 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR       2
 #define VERSION_MINOR       0
-#define VERSION_REVISION    37
+#define VERSION_REVISION    38
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"
 #define RTMP_SIG_SRS_ROLE "origin/edge server"
diff --git a/trunk/src/rtmp/srs_protocol_handshake.cpp b/trunk/src/rtmp/srs_protocol_handshake.cpp
index a5b11ef13..e67c9e9ac 100644
--- a/trunk/src/rtmp/srs_protocol_handshake.cpp
+++ b/trunk/src/rtmp/srs_protocol_handshake.cpp
@@ -514,7 +514,7 @@ namespace _srs_internal
         return ret;
     }
     
-    int c1s1_strategy::s1_create(c1s1* owner)
+    int c1s1_strategy::s1_create(c1s1* owner, c1s1* c1)
     {
         int ret = ERROR_SUCCESS;
 
@@ -528,8 +528,7 @@ namespace _srs_internal
         // directly generate the public key.
         // @see: https://github.com/winlinvip/simple-rtmp-server/issues/148
         int pkey_size = 128;
-        // TODO: FIXME: use c1 public key to calc the shared key.
-        if ((ret = dh.copy_public_key(key.key, pkey_size)) != ERROR_SUCCESS) {
+        if ((ret = dh.copy_shared_key(c1->get_key(), 128, key.key, pkey_size)) != ERROR_SUCCESS) {
             srs_error("calc s1 key failed. ret=%d", ret);
             return ret;
         }
@@ -827,7 +826,6 @@ namespace _srs_internal
         return ret;
     }
     
-    // TODO: FIXME: move to the right position.
     c1s1::c1s1()
     {
         payload = NULL;
@@ -835,21 +833,6 @@ namespace _srs_internal
     c1s1::~c1s1()
     {
         srs_freep(payload);
-        /*
-        void c1s1::destroy_blocks()
-        {
-            if (schema == srs_schema_invalid) {
-                return;
-            }
-            
-            if (schema == srs_schema0) {
-                block0.key.free();
-                block1.digest.free();
-            } else {
-                block0.digest.free();
-                block1.key.free();
-            }
-        }*/
     }
     
     srs_schema_type c1s1::schema()
@@ -960,7 +943,7 @@ namespace _srs_internal
             payload = new c1s1_strategy_schema1();
         }
         
-        return payload->s1_create(this);
+        return payload->s1_create(this, c1);
     }
     
     int c1s1::s1_validate_digest(bool& is_valid)
diff --git a/trunk/src/rtmp/srs_protocol_handshake.hpp b/trunk/src/rtmp/srs_protocol_handshake.hpp
index 1fd47e013..4b35a21ca 100644
--- a/trunk/src/rtmp/srs_protocol_handshake.hpp
+++ b/trunk/src/rtmp/srs_protocol_handshake.hpp
@@ -245,8 +245,32 @@ namespace _srs_internal
         virtual int c1_validate_digest(c1s1* owner, bool& is_valid);
         /**
         * server: create and sign the s1 from c1.
+        *       // decode c1 try schema0 then schema1
+        *       c1-digest-data = get-c1-digest-data(schema0)
+        *       if c1-digest-data equals to calc_c1_digest(c1, schema0) {  
+        *           c1-key-data = get-c1-key-data(schema0)  
+        *           schema = schema0
+        *       } else {  
+        *           c1-digest-data = get-c1-digest-data(schema1)  
+        *           if c1-digest-data not equals to calc_c1_digest(c1, schema1) {
+        *               switch to simple handshake.  
+        *               return  
+        *           }
+        *           c1-key-data = get-c1-key-data(schema1)  
+        *           schema = schema1
+        *       }
+        * 
+        *       // generate s1
+        *       random fill 1536bytes s1
+        *       time = time() // c1[0-3]
+        *       version = [0x04, 0x05, 0x00, 0x01] // s1[4-7]
+        *       s1-key-data=shared_key=DH_compute_key(peer_pub_key=c1-key-data)
+        *       get c1s1-joined by specified schema
+        *       s1-digest-data = HMACsha256(c1s1-joined, FMSKey, 36)
+        *       copy s1-digest-data and s1-key-data to s1.
+        * @param c1, to get the peer_pub_key of client.
         */
-        virtual int s1_create(c1s1* owner);
+        virtual int s1_create(c1s1* owner, c1s1* c1);
         /**
         * server: validate the parsed s1 schema
         */