Improved various code bits

src/main/java/fr/xephi/authme/security/crypts/BCRYPT.java

@@ -98,7 +98,7 @@ public class BCRYPT implements EncryptionMethod {
     private static String encode_base64(byte d[], int len)
         throws IllegalArgumentException {
         int off = 0;
-        StringBuffer rs = new StringBuffer();
+        StringBuilder rs = new StringBuilder();
         int c1, c2;
 
         if (len <= 0 || len > d.length)
@@ -154,7 +154,7 @@ public class BCRYPT implements EncryptionMethod {
      */
     private static byte[] decode_base64(String s, int maxolen)
         throws IllegalArgumentException {
-        StringBuffer rs = new StringBuffer();
+        StringBuilder rs = new StringBuilder();
         int off = 0, slen = s.length(), olen = 0;
         byte ret[];
         byte c1, c2, c3, c4, o;
@@ -230,7 +230,7 @@ public class BCRYPT implements EncryptionMethod {
         byte passwordb[], saltb[], hashed[];
         char minor = (char) 0;
         int rounds, off = 0;
-        StringBuffer rs = new StringBuffer();
+        StringBuilder rs = new StringBuilder();
 
         if (salt.charAt(0) != '$' || salt.charAt(1) != '2')
             throw new IllegalArgumentException("Invalid salt version");
@@ -283,7 +283,7 @@ public class BCRYPT implements EncryptionMethod {
      * @return an encoded salt value
      */
     public static String gensalt(int log_rounds, SecureRandom random) {
-        StringBuffer rs = new StringBuffer();
+        StringBuilder rs = new StringBuilder();
         byte rnd[] = new byte[BCRYPT_SALT_LEN];
 
         random.nextBytes(rnd);

src/main/java/fr/xephi/authme/security/crypts/PHPFUSION.java

@@ -50,9 +50,9 @@ public class PHPFUSION implements EncryptionMethod {
             Mac mac = Mac.getInstance(algo);
             mac.init(key);
             byte[] bytes = mac.doFinal(password.getBytes("ASCII"));
-            StringBuffer hash = new StringBuffer();
-            for (int i = 0; i < bytes.length; i++) {
-                String hex = Integer.toHexString(0xFF & bytes[i]);
+            StringBuilder hash = new StringBuilder();
+            for (byte aByte : bytes) {
+                String hex = Integer.toHexString(0xFF & aByte);
                 if (hex.length() == 1) {
                     hash.append('0');
                 }

src/main/java/fr/xephi/authme/security/crypts/XF.java

@@ -55,11 +55,11 @@ public class XF implements EncryptionMethod {
         MessageDigest md = MessageDigest.getInstance("SHA-256");
         md.update(password.getBytes());
         byte byteData[] = md.digest();
-        StringBuffer sb = new StringBuffer();
+        StringBuilder sb = new StringBuilder();
         for (byte element : byteData) {
             sb.append(Integer.toString((element & 0xff) + 0x100, 16).substring(1));
         }
-        StringBuffer hexString = new StringBuffer();
+        StringBuilder hexString = new StringBuilder();
         for (byte element : byteData) {
             String hex = Integer.toHexString(0xff & element);
             if (hex.length() == 1) {