unitfixes (#3)

- fix regex match padding
- fix key copying
- add more unit tests

cipher.cc

@@ -56,11 +56,8 @@ void cipher::init(const string& phrase) {
   dig.initDigest();
   dig.putDigest( (unsigned char *)phrase.c_str(), phrase.length() );
   __key = dig.stringDigest(); // this is a 32 byte long string, as Rijndael:: expects
-  
-  /* convert the key to unsigned char[] */
-  for(int i=0; i<32; i++) {
-    key[i] = __key[i];
-  }
+
+  memcpy(key, __key, 32);
 }