diff --git a/Makefile b/Makefile
index 45631905..63d9085d 100644
--- a/Makefile
+++ b/Makefile
@@ -43,7 +43,7 @@ jemalloc : $(MALLOC_STATICLIB)
 CSERVICE = snlua logger gate harbor
 LUA_CLIB = skynet socketdriver int64 bson mongo md5 netpack \
   cjson clientsocket memory profile multicast \
-  cluster
+  cluster crypt 
 
 SKYNET_SRC = skynet_main.c skynet_handle.c skynet_module.c skynet_mq.c \
   skynet_server.c skynet_start.c skynet_timer.c skynet_error.c \
@@ -110,6 +110,9 @@ $(LUA_CLIB_PATH)/multicast.so : lualib-src/lua-multicast.c | $(LUA_CLIB_PATH)
 $(LUA_CLIB_PATH)/cluster.so : lualib-src/lua-cluster.c | $(LUA_CLIB_PATH)
 	$(CC) $(CFLAGS) $(SHARED) -Iskynet-src $^ -o $@ 
 
+$(LUA_CLIB_PATH)/crypt.so : lualib-src/lua-crypt.c | $(LUA_CLIB_PATH)
+	$(CC) $(CFLAGS) $(SHARED) $^ -o $@ 
+
 clean :
 	rm -f $(SKYNET_BUILD_PATH)/skynet $(CSERVICE_PATH)/*.so $(LUA_CLIB_PATH)/*.so
 
diff --git a/lualib-src/lua-crypt.c b/lualib-src/lua-crypt.c
new file mode 100644
index 00000000..34a190e7
--- /dev/null
+++ b/lualib-src/lua-crypt.c
@@ -0,0 +1,859 @@
+#include <lua.h>
+#include <lauxlib.h>
+
+#include <time.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define SMALL_CHUNK 256
+
+/* the eight DES S-boxes */
+
+uint32_t SB1[64] = {
+	0x01010400, 0x00000000, 0x00010000, 0x01010404,
+	0x01010004, 0x00010404, 0x00000004, 0x00010000,
+	0x00000400, 0x01010400, 0x01010404, 0x00000400,
+	0x01000404, 0x01010004, 0x01000000, 0x00000004,
+	0x00000404, 0x01000400, 0x01000400, 0x00010400,
+	0x00010400, 0x01010000, 0x01010000, 0x01000404,
+	0x00010004, 0x01000004, 0x01000004, 0x00010004,
+	0x00000000, 0x00000404, 0x00010404, 0x01000000,
+	0x00010000, 0x01010404, 0x00000004, 0x01010000,
+	0x01010400, 0x01000000, 0x01000000, 0x00000400,
+	0x01010004, 0x00010000, 0x00010400, 0x01000004,
+	0x00000400, 0x00000004, 0x01000404, 0x00010404,
+	0x01010404, 0x00010004, 0x01010000, 0x01000404,
+	0x01000004, 0x00000404, 0x00010404, 0x01010400,
+	0x00000404, 0x01000400, 0x01000400, 0x00000000,
+	0x00010004, 0x00010400, 0x00000000, 0x01010004
+};
+
+static uint32_t SB2[64] = {
+	0x80108020, 0x80008000, 0x00008000, 0x00108020,
+	0x00100000, 0x00000020, 0x80100020, 0x80008020,
+	0x80000020, 0x80108020, 0x80108000, 0x80000000,
+	0x80008000, 0x00100000, 0x00000020, 0x80100020,
+	0x00108000, 0x00100020, 0x80008020, 0x00000000,
+	0x80000000, 0x00008000, 0x00108020, 0x80100000,
+	0x00100020, 0x80000020, 0x00000000, 0x00108000,
+	0x00008020, 0x80108000, 0x80100000, 0x00008020,
+	0x00000000, 0x00108020, 0x80100020, 0x00100000,
+	0x80008020, 0x80100000, 0x80108000, 0x00008000,
+	0x80100000, 0x80008000, 0x00000020, 0x80108020,
+	0x00108020, 0x00000020, 0x00008000, 0x80000000,
+	0x00008020, 0x80108000, 0x00100000, 0x80000020,
+	0x00100020, 0x80008020, 0x80000020, 0x00100020,
+	0x00108000, 0x00000000, 0x80008000, 0x00008020,
+	0x80000000, 0x80100020, 0x80108020, 0x00108000
+};
+
+static uint32_t SB3[64] = {
+	0x00000208, 0x08020200, 0x00000000, 0x08020008,
+	0x08000200, 0x00000000, 0x00020208, 0x08000200,
+	0x00020008, 0x08000008, 0x08000008, 0x00020000,
+	0x08020208, 0x00020008, 0x08020000, 0x00000208,
+	0x08000000, 0x00000008, 0x08020200, 0x00000200,
+	0x00020200, 0x08020000, 0x08020008, 0x00020208,
+	0x08000208, 0x00020200, 0x00020000, 0x08000208,
+	0x00000008, 0x08020208, 0x00000200, 0x08000000,
+	0x08020200, 0x08000000, 0x00020008, 0x00000208,
+	0x00020000, 0x08020200, 0x08000200, 0x00000000,
+	0x00000200, 0x00020008, 0x08020208, 0x08000200,
+	0x08000008, 0x00000200, 0x00000000, 0x08020008,
+	0x08000208, 0x00020000, 0x08000000, 0x08020208,
+	0x00000008, 0x00020208, 0x00020200, 0x08000008,
+	0x08020000, 0x08000208, 0x00000208, 0x08020000,
+	0x00020208, 0x00000008, 0x08020008, 0x00020200
+};
+
+static uint32_t SB4[64] = {
+	0x00802001, 0x00002081, 0x00002081, 0x00000080,
+	0x00802080, 0x00800081, 0x00800001, 0x00002001,
+	0x00000000, 0x00802000, 0x00802000, 0x00802081,
+	0x00000081, 0x00000000, 0x00800080, 0x00800001,
+	0x00000001, 0x00002000, 0x00800000, 0x00802001,
+	0x00000080, 0x00800000, 0x00002001, 0x00002080,
+	0x00800081, 0x00000001, 0x00002080, 0x00800080,
+	0x00002000, 0x00802080, 0x00802081, 0x00000081,
+	0x00800080, 0x00800001, 0x00802000, 0x00802081,
+	0x00000081, 0x00000000, 0x00000000, 0x00802000,
+	0x00002080, 0x00800080, 0x00800081, 0x00000001,
+	0x00802001, 0x00002081, 0x00002081, 0x00000080,
+	0x00802081, 0x00000081, 0x00000001, 0x00002000,
+	0x00800001, 0x00002001, 0x00802080, 0x00800081,
+	0x00002001, 0x00002080, 0x00800000, 0x00802001,
+	0x00000080, 0x00800000, 0x00002000, 0x00802080
+};
+
+static uint32_t SB5[64] = {
+	0x00000100, 0x02080100, 0x02080000, 0x42000100,
+	0x00080000, 0x00000100, 0x40000000, 0x02080000,
+	0x40080100, 0x00080000, 0x02000100, 0x40080100,
+	0x42000100, 0x42080000, 0x00080100, 0x40000000,
+	0x02000000, 0x40080000, 0x40080000, 0x00000000,
+	0x40000100, 0x42080100, 0x42080100, 0x02000100,
+	0x42080000, 0x40000100, 0x00000000, 0x42000000,
+	0x02080100, 0x02000000, 0x42000000, 0x00080100,
+	0x00080000, 0x42000100, 0x00000100, 0x02000000,
+	0x40000000, 0x02080000, 0x42000100, 0x40080100,
+	0x02000100, 0x40000000, 0x42080000, 0x02080100,
+	0x40080100, 0x00000100, 0x02000000, 0x42080000,
+	0x42080100, 0x00080100, 0x42000000, 0x42080100,
+	0x02080000, 0x00000000, 0x40080000, 0x42000000,
+	0x00080100, 0x02000100, 0x40000100, 0x00080000,
+	0x00000000, 0x40080000, 0x02080100, 0x40000100
+};
+
+static uint32_t SB6[64] = {
+	0x20000010, 0x20400000, 0x00004000, 0x20404010,
+	0x20400000, 0x00000010, 0x20404010, 0x00400000,
+	0x20004000, 0x00404010, 0x00400000, 0x20000010,
+	0x00400010, 0x20004000, 0x20000000, 0x00004010,
+	0x00000000, 0x00400010, 0x20004010, 0x00004000,
+	0x00404000, 0x20004010, 0x00000010, 0x20400010,
+	0x20400010, 0x00000000, 0x00404010, 0x20404000,
+	0x00004010, 0x00404000, 0x20404000, 0x20000000,
+	0x20004000, 0x00000010, 0x20400010, 0x00404000,
+	0x20404010, 0x00400000, 0x00004010, 0x20000010,
+	0x00400000, 0x20004000, 0x20000000, 0x00004010,
+	0x20000010, 0x20404010, 0x00404000, 0x20400000,
+	0x00404010, 0x20404000, 0x00000000, 0x20400010,
+	0x00000010, 0x00004000, 0x20400000, 0x00404010,
+	0x00004000, 0x00400010, 0x20004010, 0x00000000,
+	0x20404000, 0x20000000, 0x00400010, 0x20004010
+};
+
+static uint32_t SB7[64] = {
+	0x00200000, 0x04200002, 0x04000802, 0x00000000,
+	0x00000800, 0x04000802, 0x00200802, 0x04200800,
+	0x04200802, 0x00200000, 0x00000000, 0x04000002,
+	0x00000002, 0x04000000, 0x04200002, 0x00000802,
+	0x04000800, 0x00200802, 0x00200002, 0x04000800,
+	0x04000002, 0x04200000, 0x04200800, 0x00200002,
+	0x04200000, 0x00000800, 0x00000802, 0x04200802,
+	0x00200800, 0x00000002, 0x04000000, 0x00200800,
+	0x04000000, 0x00200800, 0x00200000, 0x04000802,
+	0x04000802, 0x04200002, 0x04200002, 0x00000002,
+	0x00200002, 0x04000000, 0x04000800, 0x00200000,
+	0x04200800, 0x00000802, 0x00200802, 0x04200800,
+	0x00000802, 0x04000002, 0x04200802, 0x04200000,
+	0x00200800, 0x00000000, 0x00000002, 0x04200802,
+	0x00000000, 0x00200802, 0x04200000, 0x00000800,
+	0x04000002, 0x04000800, 0x00000800, 0x00200002
+};
+
+static uint32_t SB8[64] = {
+	0x10001040, 0x00001000, 0x00040000, 0x10041040,
+	0x10000000, 0x10001040, 0x00000040, 0x10000000,
+	0x00040040, 0x10040000, 0x10041040, 0x00041000,
+	0x10041000, 0x00041040, 0x00001000, 0x00000040,
+	0x10040000, 0x10000040, 0x10001000, 0x00001040,
+	0x00041000, 0x00040040, 0x10040040, 0x10041000,
+	0x00001040, 0x00000000, 0x00000000, 0x10040040,
+	0x10000040, 0x10001000, 0x00041040, 0x00040000,
+	0x00041040, 0x00040000, 0x10041000, 0x00001000,
+	0x00000040, 0x10040040, 0x00001000, 0x00041040,
+	0x10001000, 0x00000040, 0x10000040, 0x10040000,
+	0x10040040, 0x10000000, 0x00040000, 0x10001040,
+	0x00000000, 0x10041040, 0x00040040, 0x10000040,
+	0x10040000, 0x10001000, 0x10001040, 0x00000000,
+	0x10041040, 0x00041000, 0x00041000, 0x00001040,
+	0x00001040, 0x00040040, 0x10000000, 0x10041000
+};
+
+/* PC1: left and right halves bit-swap */
+
+static uint32_t LHs[16] = {
+	0x00000000, 0x00000001, 0x00000100, 0x00000101,
+	0x00010000, 0x00010001, 0x00010100, 0x00010101,
+	0x01000000, 0x01000001, 0x01000100, 0x01000101,
+	0x01010000, 0x01010001, 0x01010100, 0x01010101
+};
+
+static uint32_t RHs[16] = {
+	0x00000000, 0x01000000, 0x00010000, 0x01010000,
+	0x00000100, 0x01000100, 0x00010100, 0x01010100,
+	0x00000001, 0x01000001, 0x00010001, 0x01010001,
+	0x00000101, 0x01000101, 0x00010101, 0x01010101,
+};
+
+/* platform-independant 32-bit integer manipulation macros */
+
+#define GET_UINT32(n,b,i)					   \
+{											   \
+	(n) = ( (uint32_t) (b)[(i)	] << 24 )	   \
+		| ( (uint32_t) (b)[(i) + 1] << 16 )	   \
+		| ( (uint32_t) (b)[(i) + 2] <<  8 )	   \
+		| ( (uint32_t) (b)[(i) + 3]	   );	  \
+}
+
+#define PUT_UINT32(n,b,i)					   \
+{											   \
+	(b)[(i)	] = (uint8_t) ( (n) >> 24 );	   \
+	(b)[(i) + 1] = (uint8_t) ( (n) >> 16 );	   \
+	(b)[(i) + 2] = (uint8_t) ( (n) >>  8 );	   \
+	(b)[(i) + 3] = (uint8_t) ( (n)	   );	   \
+}
+
+/* Initial Permutation macro */
+
+#define DES_IP(X,Y)											 \
+{															   \
+	T = ((X >>  4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T <<  4);   \
+	T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16);   \
+	T = ((Y >>  2) ^ X) & 0x33333333; X ^= T; Y ^= (T <<  2);   \
+	T = ((Y >>  8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T <<  8);   \
+	Y = ((Y << 1) | (Y >> 31)) & 0xFFFFFFFF;					\
+	T = (X ^ Y) & 0xAAAAAAAA; Y ^= T; X ^= T;				   \
+	X = ((X << 1) | (X >> 31)) & 0xFFFFFFFF;					\
+}
+
+/* Final Permutation macro */
+
+#define DES_FP(X,Y)											 \
+{															   \
+	X = ((X << 31) | (X >> 1)) & 0xFFFFFFFF;					\
+	T = (X ^ Y) & 0xAAAAAAAA; X ^= T; Y ^= T;				   \
+	Y = ((Y << 31) | (Y >> 1)) & 0xFFFFFFFF;					\
+	T = ((Y >>  8) ^ X) & 0x00FF00FF; X ^= T; Y ^= (T <<  8);   \
+	T = ((Y >>  2) ^ X) & 0x33333333; X ^= T; Y ^= (T <<  2);   \
+	T = ((X >> 16) ^ Y) & 0x0000FFFF; Y ^= T; X ^= (T << 16);   \
+	T = ((X >>  4) ^ Y) & 0x0F0F0F0F; Y ^= T; X ^= (T <<  4);   \
+}
+
+/* DES round macro */
+
+#define DES_ROUND(X,Y)						  \
+{											   \
+	T = *SK++ ^ X;							  \
+	Y ^= SB8[ (T	  ) & 0x3F ] ^			  \
+		 SB6[ (T >>  8) & 0x3F ] ^			  \
+		 SB4[ (T >> 16) & 0x3F ] ^			  \
+		 SB2[ (T >> 24) & 0x3F ];			   \
+												\
+	T = *SK++ ^ ((X << 28) | (X >> 4));		 \
+	Y ^= SB7[ (T	  ) & 0x3F ] ^			  \
+		 SB5[ (T >>  8) & 0x3F ] ^			  \
+		 SB3[ (T >> 16) & 0x3F ] ^			  \
+		 SB1[ (T >> 24) & 0x3F ];			   \
+}
+
+/* DES key schedule */
+
+static void 
+des_main_ks( uint32_t SK[32], const uint8_t key[8] ) {
+	int i;
+	uint32_t X, Y, T;
+
+	GET_UINT32( X, key, 0 );
+	GET_UINT32( Y, key, 4 );
+
+	/* Permuted Choice 1 */
+
+	T =  ((Y >>  4) ^ X) & 0x0F0F0F0F;  X ^= T; Y ^= (T <<  4);
+	T =  ((Y	  ) ^ X) & 0x10101010;  X ^= T; Y ^= (T	  );
+
+	X =   (LHs[ (X	  ) & 0xF] << 3) | (LHs[ (X >>  8) & 0xF ] << 2)
+		| (LHs[ (X >> 16) & 0xF] << 1) | (LHs[ (X >> 24) & 0xF ]	 )
+		| (LHs[ (X >>  5) & 0xF] << 7) | (LHs[ (X >> 13) & 0xF ] << 6)
+		| (LHs[ (X >> 21) & 0xF] << 5) | (LHs[ (X >> 29) & 0xF ] << 4);
+
+	Y =   (RHs[ (Y >>  1) & 0xF] << 3) | (RHs[ (Y >>  9) & 0xF ] << 2)
+		| (RHs[ (Y >> 17) & 0xF] << 1) | (RHs[ (Y >> 25) & 0xF ]	 )
+		| (RHs[ (Y >>  4) & 0xF] << 7) | (RHs[ (Y >> 12) & 0xF ] << 6)
+		| (RHs[ (Y >> 20) & 0xF] << 5) | (RHs[ (Y >> 28) & 0xF ] << 4);
+
+	X &= 0x0FFFFFFF;
+	Y &= 0x0FFFFFFF;
+
+	/* calculate subkeys */
+
+	for( i = 0; i < 16; i++ )
+	{
+		if( i < 2 || i == 8 || i == 15 )
+		{
+			X = ((X <<  1) | (X >> 27)) & 0x0FFFFFFF;
+			Y = ((Y <<  1) | (Y >> 27)) & 0x0FFFFFFF;
+		}
+		else
+		{
+			X = ((X <<  2) | (X >> 26)) & 0x0FFFFFFF;
+			Y = ((Y <<  2) | (Y >> 26)) & 0x0FFFFFFF;
+		}
+
+		*SK++ =   ((X <<  4) & 0x24000000) | ((X << 28) & 0x10000000)
+				| ((X << 14) & 0x08000000) | ((X << 18) & 0x02080000)
+				| ((X <<  6) & 0x01000000) | ((X <<  9) & 0x00200000)
+				| ((X >>  1) & 0x00100000) | ((X << 10) & 0x00040000)
+				| ((X <<  2) & 0x00020000) | ((X >> 10) & 0x00010000)
+				| ((Y >> 13) & 0x00002000) | ((Y >>  4) & 0x00001000)
+				| ((Y <<  6) & 0x00000800) | ((Y >>  1) & 0x00000400)
+				| ((Y >> 14) & 0x00000200) | ((Y	  ) & 0x00000100)
+				| ((Y >>  5) & 0x00000020) | ((Y >> 10) & 0x00000010)
+				| ((Y >>  3) & 0x00000008) | ((Y >> 18) & 0x00000004)
+				| ((Y >> 26) & 0x00000002) | ((Y >> 24) & 0x00000001);
+
+		*SK++ =   ((X << 15) & 0x20000000) | ((X << 17) & 0x10000000)
+				| ((X << 10) & 0x08000000) | ((X << 22) & 0x04000000)
+				| ((X >>  2) & 0x02000000) | ((X <<  1) & 0x01000000)
+				| ((X << 16) & 0x00200000) | ((X << 11) & 0x00100000)
+				| ((X <<  3) & 0x00080000) | ((X >>  6) & 0x00040000)
+				| ((X << 15) & 0x00020000) | ((X >>  4) & 0x00010000)
+				| ((Y >>  2) & 0x00002000) | ((Y <<  8) & 0x00001000)
+				| ((Y >> 14) & 0x00000808) | ((Y >>  9) & 0x00000400)
+				| ((Y	  ) & 0x00000200) | ((Y <<  7) & 0x00000100)
+				| ((Y >>  7) & 0x00000020) | ((Y >>  3) & 0x00000011)
+				| ((Y <<  2) & 0x00000004) | ((Y >> 21) & 0x00000002);
+	}
+}
+
+/* DES 64-bit block encryption/decryption */
+
+static void 
+des_crypt( const uint32_t SK[32], const uint8_t input[8], uint8_t output[8] ) {
+	uint32_t X, Y, T;
+
+	GET_UINT32( X, input, 0 );
+	GET_UINT32( Y, input, 4 );
+
+	DES_IP( X, Y );
+
+	DES_ROUND( Y, X );  DES_ROUND( X, Y );
+	DES_ROUND( Y, X );  DES_ROUND( X, Y );
+	DES_ROUND( Y, X );  DES_ROUND( X, Y );
+	DES_ROUND( Y, X );  DES_ROUND( X, Y );
+	DES_ROUND( Y, X );  DES_ROUND( X, Y );
+	DES_ROUND( Y, X );  DES_ROUND( X, Y );
+	DES_ROUND( Y, X );  DES_ROUND( X, Y );
+	DES_ROUND( Y, X );  DES_ROUND( X, Y );
+
+	DES_FP( Y, X );
+
+	PUT_UINT32( Y, output, 0 );
+	PUT_UINT32( X, output, 4 );
+}
+
+static int
+lrandomkey(lua_State *L) {
+	char tmp[8];
+	int i;
+	for (i=0;i<8;i++) {
+		tmp[i] = random() & 0xff;
+	}
+	lua_pushlstring(L, tmp, 8);
+	return 1;
+}
+
+static void
+des_key(lua_State *L, uint32_t SK[32]) {
+	size_t keysz = 0;
+	const void * key = luaL_checklstring(L, 1, &keysz);
+	if (keysz != 8) {
+		luaL_error(L, "Invalid key size %d, need 8 bytes", (int)keysz);
+	}
+	des_main_ks(SK, key);
+}
+
+static int
+ldesencode(lua_State *L) {
+	uint32_t SK[32];
+	des_key(L, SK);
+
+	size_t textsz = 0;
+	const uint8_t * text = (const uint8_t *)luaL_checklstring(L, 2, &textsz);
+	size_t chunksz = (textsz + 8) & ~7;
+	uint8_t tmp[SMALL_CHUNK];
+	uint8_t *buffer = tmp;
+	if (chunksz > SMALL_CHUNK) {
+		buffer = lua_newuserdata(L, chunksz);
+	}
+	int i;
+	for (i=0;i<(int)textsz-7;i+=8) {
+		des_crypt(SK, text+i, buffer+i);
+	}
+	int bytes = textsz - i;
+	uint8_t tail[8];
+	int j;
+	for (j=0;j<8;j++) {
+		if (j < bytes) {
+			tail[j] = text[i+j];
+		} else if (j==bytes) {
+			tail[j] = 0x80;
+		} else {
+			tail[j] = 0;
+		}
+	}
+	des_crypt(SK, tail, buffer+i);
+	lua_pushlstring(L, (const char *)buffer, chunksz);
+
+	return 1;
+}
+
+static int
+ldesdecode(lua_State *L) {
+	uint32_t ESK[32];
+	des_key(L, ESK);
+	uint32_t SK[32];
+	int i;
+	for( i = 0; i < 32; i += 2 ) {
+		SK[i] = ESK[30 - i];
+		SK[i + 1] = ESK[31 - i];
+	}
+	size_t textsz = 0;
+	const uint8_t *text = (const uint8_t *)luaL_checklstring(L, 2, &textsz);
+	if ((textsz & 7) || textsz == 0) {
+		return luaL_error(L, "Invalid des crypt text length %d", (int)textsz);
+	}
+	uint8_t tmp[SMALL_CHUNK];
+	uint8_t *buffer = tmp;
+	if (textsz > SMALL_CHUNK) {
+		buffer = lua_newuserdata(L, textsz);
+	}
+	for (i=0;i<textsz;i+=8) {
+		des_crypt(SK, text+i, buffer+i);
+	}
+	int padding = 1;
+	for (i=textsz-1;i>=textsz-8;i--) {
+		if (buffer[i] == 0) {
+			padding++;
+		} else if (buffer[i] == 0x80) {
+			break;
+		} else {
+			return luaL_error(L, "Invalid des crypt text");
+		}
+	}
+	if (padding > 8) {
+		return luaL_error(L, "Invalid des crypt text");
+	}
+	lua_pushlstring(L, (const char *)buffer, textsz - padding);
+	return 1;
+}
+
+
+static void
+Hash(const char * str, int sz, uint8_t key[8]) {
+	uint32_t djb_hash = 5381L;
+	uint32_t js_hash = 1315423911L;
+
+	int i;
+	for (i=0;i<sz;i++) {
+		uint8_t c = (uint8_t)str[i];
+		djb_hash += (djb_hash << 5) + c;
+		js_hash ^= ((js_hash << 5) + c + (js_hash >> 2));
+	}
+
+	key[0] = djb_hash & 0xff;
+	key[1] = (djb_hash >> 8) & 0xff;
+	key[2] = (djb_hash >> 16) & 0xff;
+	key[3] = (djb_hash >> 24) & 0xff;
+
+	key[4] = js_hash & 0xff;
+	key[5] = (js_hash >> 8) & 0xff;
+	key[6] = (js_hash >> 16) & 0xff;
+	key[7] = (js_hash >> 24) & 0xff;
+}
+
+static int
+lhashkey(lua_State *L) {
+	size_t sz = 0;
+	const char * key = luaL_checklstring(L, 1, &sz);
+	uint8_t realkey[8];
+	Hash(key,(int)sz,realkey);
+	lua_pushlstring(L, (const char *)realkey, 8);
+	return 1;
+}
+
+static int
+ltohex(lua_State *L) {
+	static char hex[] = "0123456789abcdef";
+	size_t sz = 0;
+	const uint8_t * text = (const uint8_t *)luaL_checklstring(L, 1, &sz);
+	char tmp[SMALL_CHUNK];
+	char *buffer = tmp;
+	if (sz > SMALL_CHUNK/2) {
+		buffer = lua_newuserdata(L, sz * 2);
+	}
+	int i;
+	for (i=0;i<sz;i++) {
+		buffer[i*2] = hex[text[i] >> 4];
+		buffer[i*2+1] = hex[text[i] & 0xf];
+	}
+	lua_pushlstring(L, buffer, sz * 2);
+	return 1;
+}
+
+#define HEX(v,c) { char tmp = (char) c; if (tmp >= '0' && tmp <= '9') { v = tmp-'0'; } else { v = tmp - 'a' + 10; } }
+
+static int
+lfromhex(lua_State *L) {
+	size_t sz = 0;
+	const char * text = luaL_checklstring(L, 1, &sz);
+	if (sz & 2) {
+		return luaL_error(L, "Invalid hex text size %d", (int)sz);
+	}
+	char tmp[SMALL_CHUNK];
+	char *buffer = tmp;
+	if (sz > SMALL_CHUNK*2) {
+		buffer = lua_newuserdata(L, sz / 2);
+	}
+	int i;
+	for (i=0;i<sz;i+=2) {
+		uint8_t hi,low;
+		HEX(hi, text[i]);
+		HEX(low, text[i+1]);
+		if (hi > 16 || low > 16) {
+			return luaL_error(L, "Invalid hex text", text);
+		}
+		buffer[i/2] = hi<<4 | low;
+	}
+	lua_pushlstring(L, buffer, i/2);
+	return 1;
+}
+
+// Constants are the integer part of the sines of integers (in radians) * 2^32.
+const uint32_t k[64] = {
+0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee ,
+0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501 ,
+0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be ,
+0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821 ,
+0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa ,
+0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8 ,
+0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed ,
+0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a ,
+0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c ,
+0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70 ,
+0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05 ,
+0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665 ,
+0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039 ,
+0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1 ,
+0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1 ,
+0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 };
+ 
+// r specifies the per-round shift amounts
+const uint32_t r[] = {7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
+					  5,  9, 14, 20, 5,  9, 14, 20, 5,  9, 14, 20, 5,  9, 14, 20,
+					  4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
+					  6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21};
+ 
+// leftrotate function definition
+#define LEFTROTATE(x, c) (((x) << (c)) | ((x) >> (32 - (c))))
+ 
+static void
+hmac(uint32_t x[2], uint32_t y[2], uint32_t result[2]) {
+	uint32_t w[16];
+	uint32_t a, b, c, d, f, g, temp;
+	int i;
+ 
+	a = 0x67452301u;
+	b = 0xefcdab89u;
+	c = 0x98badcfeu;
+	d = 0x10325476u;
+
+	for (i=0;i<16;i+=4) {
+		w[i] = x[1];
+		w[i+1] = x[0];
+		w[i+2] = y[1];
+		w[i+3] = y[0];
+	}
+
+	for(i = 0; i<64; i++) {
+		if (i < 16) {
+			f = (b & c) | ((~b) & d);
+			g = i;
+		} else if (i < 32) {
+			f = (d & b) | ((~d) & c);
+			g = (5*i + 1) % 16;
+		} else if (i < 48) {
+			f = b ^ c ^ d;
+			g = (3*i + 5) % 16; 
+		} else {
+			f = c ^ (b | (~d));
+			g = (7*i) % 16;
+		}
+
+		temp = d;
+		d = c;
+		c = b;
+		b = b + LEFTROTATE((a + f + k[i] + w[g]), r[i]);
+		a = temp;
+
+	}
+
+	result[0] = c^d;
+	result[1] = a^b;
+}
+
+static void
+read64(lua_State *L, uint32_t xx[2], uint32_t yy[2]) {
+	size_t sz = 0;
+	const uint8_t *x = (const uint8_t *)luaL_checklstring(L, 1, &sz);
+	if (sz != 8) {
+		luaL_error(L, "Invalid hmac x");
+	}
+	const uint8_t *y = (const uint8_t *)luaL_checklstring(L, 2, &sz);
+	if (sz != 8) {
+		luaL_error(L, "Invalid hmac y");
+	}
+	xx[0] = x[0] | x[1]<<8 | x[2]<<16 | x[3]<<24;
+	xx[1] = x[4] | x[5]<<8 | x[6]<<16 | x[7]<<24;
+	yy[0] = y[0] | y[1]<<8 | y[2]<<16 | y[3]<<24;
+	yy[1] = y[4] | y[5]<<8 | y[6]<<16 | y[7]<<24;
+}
+
+static int
+lhmac64(lua_State *L) {
+	uint32_t x[2], y[2];
+	read64(L, x, y);
+	uint32_t result[2];
+	hmac(x,y,result);
+	uint8_t tmp[8];
+	tmp[0] = result[0] & 0xff;
+	tmp[1] = (result[0] >> 8 )& 0xff;
+	tmp[2] = (result[0] >> 16 )& 0xff;
+	tmp[3] = (result[0] >> 24 )& 0xff;
+	tmp[4] = result[1] & 0xff;
+	tmp[5] = (result[1] >> 8 )& 0xff;
+	tmp[6] = (result[1] >> 16 )& 0xff;
+	tmp[7] = (result[1] >> 24 )& 0xff;
+
+	lua_pushlstring(L, (const char *)tmp, 8);
+	return 1;
+}
+
+// powmodp64 for DH-key exchange
+
+// The biggest 64bit prime
+#define P 0xffffffffffffffc5ull
+
+static inline uint64_t
+mul_mod_p(uint64_t a, uint64_t b) {
+	uint64_t m = 0;
+	while(b) {
+		if(b&1) {
+			uint64_t t = P-a;
+			if ( m >= t) {
+				m -= t;
+			} else {
+				m += a;
+			}
+		}
+		if (a >= P - a) {
+			a = a * 2 - P;
+		} else {
+			a = a * 2;
+		}
+		b>>=1;
+	}
+	return m;
+}
+
+static inline uint64_t
+pow_mod_p(uint64_t a, uint64_t b) {
+	if (b==1) {
+		return a;
+	}
+	uint64_t t = pow_mod_p(a, b>>1);
+	t = mul_mod_p(t,t);
+	if (b % 2) {
+		t = mul_mod_p(t, a);
+	}
+	return t;
+}
+
+// calc a^b % p
+static uint64_t
+powmodp(uint64_t a, uint64_t b) {
+	if (a > P)
+		a%=P;
+	return pow_mod_p(a,b);
+}
+
+static void
+push64(lua_State *L, uint64_t r) {
+	uint8_t tmp[8];
+	tmp[0] = r & 0xff;
+	tmp[1] = (r >> 8 )& 0xff;
+	tmp[2] = (r >> 16 )& 0xff;
+	tmp[3] = (r >> 24 )& 0xff;
+	tmp[4] = (r >> 32 )& 0xff;
+	tmp[5] = (r >> 40 )& 0xff;
+	tmp[6] = (r >> 48 )& 0xff;
+	tmp[7] = (r >> 56 )& 0xff;
+
+	lua_pushlstring(L, (const char *)tmp, 8);
+}
+
+static int
+ldhsecret(lua_State *L) {
+	uint32_t x[2], y[2];
+	read64(L, x, y);
+	uint64_t r = powmodp((uint64_t)x[0] | (uint64_t)x[1]<<32,
+		(uint64_t)y[0] | (uint64_t)y[1]<<32);
+
+	push64(L, r);
+
+	return 1;
+}
+
+#define G 5
+
+static int
+ldhexchange(lua_State *L) {
+	size_t sz = 0;
+	const uint8_t *x = (const uint8_t *)luaL_checklstring(L, 1, &sz);
+	if (sz != 8) {
+		luaL_error(L, "Invalid hmac x");
+	}
+	uint32_t xx[2];
+	xx[0] = x[0] | x[1]<<8 | x[2]<<16 | x[3]<<24;
+	xx[1] = x[4] | x[5]<<8 | x[6]<<16 | x[7]<<24;
+
+	uint64_t r = powmodp(5,	(uint64_t)xx[0] | (uint64_t)xx[1]<<32);
+	push64(L, r);
+	return 1;
+}
+
+// base64
+
+static int
+lb64encode(lua_State *L) {
+	static const char* encoding = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+	size_t sz = 0;
+	const uint8_t * text = (const uint8_t *)luaL_checklstring(L, 1, &sz);
+	int encode_sz = (sz + 2)/3*4;
+	char tmp[SMALL_CHUNK];
+	char *buffer = tmp;
+	if (encode_sz > SMALL_CHUNK) {
+		buffer = lua_newuserdata(L, encode_sz);
+	}
+	int i,j;
+	j=0;
+	for (i=0;i<sz-2;i+=3) {
+		uint32_t v = text[i] << 16 | text[i+1] << 8 | text[i+2];
+		buffer[j] = encoding[v >> 18];
+		buffer[j+1] = encoding[(v >> 12) & 0x3f];
+		buffer[j+2] = encoding[(v >> 6) & 0x3f];
+		buffer[j+3] = encoding[(v) & 0x3f];
+		j+=4;
+	}
+	int padding = sz-i;
+	uint32_t v;
+	switch(padding) {
+	case 1 :
+		v = text[i];
+		buffer[j] = encoding[v >> 2];
+		buffer[j+1] = encoding[(v & 3) << 4];
+		buffer[j+2] = '=';
+		buffer[j+3] = '=';
+		break;
+	case 2 :
+		v = text[i] << 8 | text[i+1];
+		buffer[j] = encoding[v >> 10];
+		buffer[j+1] = encoding[(v >> 4) & 0x3f];
+		buffer[j+2] = encoding[(v & 0xf) << 2];
+		buffer[j+3] = '=';
+		break;
+	}
+	lua_pushlstring(L, buffer, encode_sz);
+	return 1;
+}
+
+static inline int
+b64index(uint8_t c) {
+	static const int decoding[] = {62,-1,-1,-1,63,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-2,-1,-1,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51};
+	int decoding_size = sizeof(decoding)/sizeof(decoding[0]);
+	if (c<43) {
+		return -1;
+	}
+	c -= 43;
+	if (c>=decoding_size)
+		return -1;
+	return decoding[c];
+}
+
+static int
+lb64decode(lua_State *L) {
+	size_t sz = 0;
+	const uint8_t * text = (const uint8_t *)luaL_checklstring(L, 1, &sz);
+	int decode_sz = (sz+3)/4*3;
+	char tmp[SMALL_CHUNK];
+	char *buffer = tmp;
+	if (decode_sz > SMALL_CHUNK) {
+		buffer = lua_newuserdata(L, decode_sz);
+	}
+	int i,j;
+	int output = 0;
+	for (i=0;i<sz;) {
+		int padding = 0;
+		int c[4];
+		for (j=0;j<4;) {
+			if (i>=sz) {
+				return luaL_error(L, "Invalid base64 text");
+			}
+			c[j] = b64index(text[i]);
+			if (c[j] == -1) {
+				++i;
+				continue;
+			}
+			if (c[j] == -2) {
+				++padding;
+			}
+			++i;
+			++j;
+		}
+		uint32_t v;
+		switch (padding) {
+		case 0:
+			v = (unsigned)c[0] << 18 | c[1] << 12 | c[2] << 6 | c[3];
+			buffer[output] = v >> 16;
+			buffer[output+1] = (v >> 8) & 0xff;
+			buffer[output+2] = v & 0xff;
+			output += 3;
+			break;
+		case 1:
+			if (c[3] != -2 || (c[2] & 3)!=0) {
+				return luaL_error(L, "Invalid base64 text");
+			}
+			v = (unsigned)c[0] << 10 | c[1] << 4 | c[2] >> 2 ;
+			buffer[output] = v >> 8;
+			buffer[output+1] = v & 0xff;
+			output += 2;
+			break;
+		case 2:
+			if (c[3] != -2 || c[2] != -2 || (c[1] & 0xf) !=0)  {
+				return luaL_error(L, "Invalid base64 text");
+			}
+			v = (unsigned)c[0] << 2 | c[1] >> 4;
+			buffer[output] = v;
+			++ output;
+			break;
+		default:
+			return luaL_error(L, "Invalid base64 text");
+		}
+	}
+	lua_pushlstring(L, buffer, output);
+	return 1;
+}
+
+int
+luaopen_crypt(lua_State *L) {
+	luaL_checkversion(L);
+	srandom(time(NULL));
+	luaL_Reg l[] = {
+		{ "hashkey", lhashkey },
+		{ "randomkey", lrandomkey },
+		{ "desencode", ldesencode },
+		{ "desdecode", ldesdecode },
+		{ "hexencode", ltohex },
+		{ "hexdecode", lfromhex },
+		{ "hmac64", lhmac64 },
+		{ "dhexchange", ldhexchange },
+		{ "dhsecret", ldhsecret },
+		{ "base64encode", lb64encode },
+		{ "base64decode", lb64decode },
+		{ NULL, NULL },
+	};
+	luaL_newlib(L,l);
+	return 1;
+}