diff --git a/.travis.yml b/.travis.yml
index 8e247b5..f8ff652 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,7 @@ python:
 env:
   - LUA="luajit"
 
-install:
+before_install:
   - sudo pip install autobahntestsuite
   - sudo apt-get install libev-dev
   - sudo apt-get install luajit
@@ -12,7 +12,17 @@ install:
   - sudo luarocks install luacov-coveralls
   - sudo luarocks install busted 1.11.1-1
 
-script: "sudo luarocks make rockspecs/lua-websockets-scm-1.rockspec && ./test.sh"
+install:
+  - sudo luarocks make rockspecs/lua-websockets-core-scm-1.rockspec
+  - sudo luarocks make rockspecs/lua-websockets-sync-scm-1.rockspec
+  - sudo luarocks make rockspecs/lua-websockets-copas-scm-1.rockspec
+  - sudo luarocks make rockspecs/lua-websockets-ev-scm-1.rockspec
+  - sudo luarocks make rockspecs/lua-websockets-scm-1.rockspec
+
+script:
+  - ./test.sh
 
 after_success:
   - luacov-coveralls
+
+
diff --git a/rockspecs/lua-websockets-copas-scm-1.rockspec b/rockspecs/lua-websockets-copas-scm-1.rockspec
new file mode 100644
index 0000000..361850a
--- /dev/null
+++ b/rockspecs/lua-websockets-copas-scm-1.rockspec
@@ -0,0 +1,31 @@
+package = "lua-websockets-copas"
+version = "scm-1"
+
+source = {
+  url = "git://github.com/lipp/lua-websockets.git",
+}
+
+description = {
+  summary = "copas backend for websockets for Lua",
+  homepage = "http://github.com/lipp/lua-websockets",
+  license = "MIT/X11",
+  detailed = "Provides async client and server for copas."
+}
+
+dependencies = {
+  "lua >= 5.1",
+  "lua-websockets-core",
+  "luasocket",
+  "copas"
+}
+
+build = {
+  type = 'none',
+  install = {
+    lua = {
+      ['websocket.client_copas'] = 'src/websocket/client_copas.lua',
+      ['websocket.server_copas'] = 'src/websocket/server_copas.lua',
+    }
+  }
+}
+
diff --git a/rockspecs/lua-websockets-core-scm-1.rockspec b/rockspecs/lua-websockets-core-scm-1.rockspec
new file mode 100644
index 0000000..9bcec15
--- /dev/null
+++ b/rockspecs/lua-websockets-core-scm-1.rockspec
@@ -0,0 +1,37 @@
+package = "lua-websockets-core"
+version = "scm-1"
+
+source = {
+  url = "git://github.com/lipp/lua-websockets.git",
+}
+
+description = {
+  summary = "Websockets for Lua",
+  homepage = "http://github.com/lipp/lua-websockets",
+  license = "MIT/X11",
+  detailed = "Provides base functionality to implement websocket protocol."
+}
+
+dependencies = {
+  "lua >= 5.1",
+  "struct",
+  "bit32",
+  "basexx",
+}
+
+build = {
+  type = 'none',
+  install = {
+    lua = {
+      ['websocket']           = 'src/websocket.lua',
+      ['websocket.sync']      = 'src/websocket/sync.lua',
+      ['websocket.client']    = 'src/websocket/client.lua',
+      ['websocket.server']    = 'src/websocket/server.lua',
+      ['websocket.handshake'] = 'src/websocket/handshake.lua',
+      ['websocket.tools']     = 'src/websocket/tools.lua',
+      ['websocket.frame']     = 'src/websocket/frame.lua',
+      ['websocket.bit']       = 'src/websocket/bit.lua',
+    }
+  }
+}
+
diff --git a/rockspecs/lua-websockets-ev-scm-1.rockspec b/rockspecs/lua-websockets-ev-scm-1.rockspec
new file mode 100644
index 0000000..2ca95e1
--- /dev/null
+++ b/rockspecs/lua-websockets-ev-scm-1.rockspec
@@ -0,0 +1,32 @@
+package = "lua-websockets-ev"
+version = "scm-1"
+
+source = {
+  url = "git://github.com/lipp/lua-websockets.git",
+}
+
+description = {
+  summary = "libev backend for websockets for Lua",
+  homepage = "http://github.com/lipp/lua-websockets",
+  license = "MIT/X11",
+  detailed = "Provides async client and server for lua-ev."
+}
+
+dependencies = {
+  "lua >= 5.1",
+  "lua-websockets-core",
+  "luasocket",
+  "lua-ev",
+}
+
+build = {
+  type = 'none',
+  install = {
+    lua = {
+      ['websocket.client_ev'] = 'src/websocket/client_ev.lua',
+      ['websocket.ev_common'] = 'src/websocket/ev_common.lua',
+      ['websocket.server_ev'] = 'src/websocket/server_ev.lua',
+    }
+  }
+}
+
diff --git a/rockspecs/lua-websockets-scm-1.rockspec b/rockspecs/lua-websockets-scm-1.rockspec
index f72b44b..85a6077 100644
--- a/rockspecs/lua-websockets-scm-1.rockspec
+++ b/rockspecs/lua-websockets-scm-1.rockspec
@@ -13,33 +13,10 @@ description = {
 }
 
 dependencies = {
-  "lua >= 5.1",
-  "struct",
-  "luasocket",
-  "luabitop",
-  "lua-ev",
-  "copas"
-}
-
-build = {
-  type = 'none',
-  install = {
-    lua = {
-      ['websocket'] = 'src/websocket.lua',
-      ['websocket.sync'] = 'src/websocket/sync.lua',
-      ['websocket.client'] = 'src/websocket/client.lua',
-      ['websocket.client_sync'] = 'src/websocket/client_sync.lua',
-      ['websocket.client_ev'] = 'src/websocket/client_ev.lua',
-      ['websocket.client_copas'] = 'src/websocket/client_copas.lua',
-      ['websocket.ev_common'] = 'src/websocket/ev_common.lua',
-      ['websocket.server'] = 'src/websocket/server.lua',
-      ['websocket.server_ev'] = 'src/websocket/server_ev.lua',
-      ['websocket.server_copas'] = 'src/websocket/server_copas.lua',
-      ['websocket.handshake'] = 'src/websocket/handshake.lua',
-      ['websocket.tools'] = 'src/websocket/tools.lua',
-      ['websocket.frame'] = 'src/websocket/frame.lua',
-      ['websocket.bit'] = 'src/websocket/bit.lua',
-    }
-  }
+  "lua-websockets-core",
+  "lua-websockets-sync",
+  "lua-websockets-copas",
+  "lua-websockets-ev",
 }
 
+build = {type = "builtin", modules = {}}
diff --git a/rockspecs/lua-websockets-sync-scm-1.rockspec b/rockspecs/lua-websockets-sync-scm-1.rockspec
new file mode 100644
index 0000000..e685d1b
--- /dev/null
+++ b/rockspecs/lua-websockets-sync-scm-1.rockspec
@@ -0,0 +1,29 @@
+package = "lua-websockets-sync"
+version = "scm-1"
+
+source = {
+  url = "git://github.com/lipp/lua-websockets.git",
+}
+
+description = {
+  summary = "Sunc backend for websockets for Lua",
+  homepage = "http://github.com/lipp/lua-websockets",
+  license = "MIT/X11",
+  detailed = "Provides sync client"
+}
+
+dependencies = {
+  "lua >= 5.1",
+  "lua-websockets-core",
+  "luasocket",
+}
+
+build = {
+  type = 'none',
+  install = {
+    lua = {
+      ['websocket.client_sync'] = 'src/websocket/client_sync.lua',
+    }
+  }
+}
+
diff --git a/src/websocket/tools.lua b/src/websocket/tools.lua
index 38a76e8..3ee8846 100644
--- a/src/websocket/tools.lua
+++ b/src/websocket/tools.lua
@@ -15,20 +15,43 @@ local tinsert = table.insert
 local tconcat = table.concat
 local mrandom = math.random
 
+local function prequire(m)
+  local ok, err = pcall(require, m)
+  if ok then return err, m end
+  return nil, err
+end
+
+local function orequire(...)
+  for _, name in ipairs{...} do
+    local mod = prequire(name)
+    if mod then return mod, name end
+  end
+end
+
+local function vrequire(...)
+  local m, n = orequire(...)
+  if m then return m, n end
+  error("Can not fine any of this modules: " .. table.concat({...}, "/"), 2)
+end
+
 -- used for generate key random ops
 math.randomseed(os.time())
 
--- SHA1 hashing from luacrypto, if available
-local sha1_crypto
-local done,crypto = pcall(require,'crypto')
-if done then
-  sha1_crypto = function(msg)
-    return crypto.digest('sha1',msg,true)
+-- SHA1 hashing from luacrypto, ldigest if available
+local shalib, name = orequire('crypto', 'sha1', 'digest')
+local sha1_digest if name == 'sha1' then
+  sha1_digest = function(str) return shalib.digest(str, true) end
+elseif name == 'crypto' then
+  sha1_digest = function(str) return shalib.digest('sha1', str, true) end
+elseif name == 'digest' then
+  if _G.sha1 and _G.sha1.digest then
+    shalib = _G.sha1
+    sha1_digest = function(str) return shalib.digest(str, true) end
   end
 end
-
+if not sha1_digest then
 -- from wiki article, not particularly clever impl
-local sha1_wiki = function(msg)
+sha1_digest = function(msg)
   local h0 = 0x67452301
   local h1 = 0xEFCDAB89
   local h2 = 0x98BADCFE
@@ -113,10 +136,19 @@ local sha1_wiki = function(msg)
   
   return struct.pack('>i>i>i>i>i',h0,h1,h2,h3,h4)
 end
+end
+
+local base, name = vrequire("base64", "mime", "basexx")
 
-local base64_encode = function(data)
-  local mime = require'mime'
-  return (mime.b64(data))
+local base64 = {} if name == 'basexx' then
+  base64.encode = function(str) return base.to_base64(str)   end
+  base64.decode = function(str) return base.from_base64(str) end
+elseif name == 'mime' then
+  base64.encode = function(str) return base.b64(str)  end
+  base64.decode = function(str) return base.ub64(str) end
+elseif name == 'base64' then
+  base64.encode = function(str) return base.encode(str)  end
+  base64.decode = function(str) return base.decode(str) end
 end
 
 local parse_url = function(url)
@@ -143,14 +175,12 @@ local generate_key = function()
   local r4 = mrandom(0,0xfffffff)
   local key = struct.pack('IIII',r1,r2,r3,r4)
   assert(#key==16,#key)
-  return base64_encode(key)
+  return base64.encode(key)
 end
 
 return {
-  sha1 = sha1_crypto or sha1_wiki,
-  base64 = {
-    encode = base64_encode
-  },
+  sha1 = sha1_digest,
+  base64 = base64,
   parse_url = parse_url,
   generate_key = generate_key,
 }