Removed redundant code, fixed some warnings, other minor fixes

src/main/java/fr/xephi/authme/security/pbkdf2/PBKDF2.java

@@ -41,7 +41,7 @@ public interface PBKDF2 {
      *
      * @return internal byte array
      */
-    public abstract byte[] deriveKey(String inputPassword);
+    byte[] deriveKey(String inputPassword);
 
     /**
      * Convert String-based input to internal byte array, then invoke PBKDF2.
@@ -51,7 +51,7 @@ public interface PBKDF2 {
      *
      * @return internal byte array
      */
-    public abstract byte[] deriveKey(String inputPassword, int dkLen);
+    byte[] deriveKey(String inputPassword, int dkLen);
 
     /**
      * Convert String-based input to internal byte arrays, then invoke PBKDF2
@@ -63,28 +63,28 @@ public interface PBKDF2 {
      * @return <code>true</code> password match; <code>false</code> incorrect
      * password
      */
-    public abstract boolean verifyKey(String inputPassword);
+    boolean verifyKey(String inputPassword);
 
     /**
      * Allow reading of configured parameters.
      *
      * @return Currently set parameters.
      */
-    public abstract PBKDF2Parameters getParameters();
+    PBKDF2Parameters getParameters();
 
     /**
      * Allow setting of configured parameters.
      *
      * @param parameters
      */
-    public abstract void setParameters(PBKDF2Parameters parameters);
+    void setParameters(PBKDF2Parameters parameters);
 
     /**
      * Get currently set Pseudo Random Function.
      *
      * @return Currently set Pseudo Random Function
      */
-    public abstract PRF getPseudoRandomFunction();
+    PRF getPseudoRandomFunction();
 
     /**
      * Set the Pseudo Random Function to use. Note that deriveKeys/getPRF does
@@ -93,5 +93,5 @@ public interface PBKDF2 {
      *
      * @param prf Pseudo Random Function to set.
      */
-    public abstract void setPseudoRandomFunction(PRF prf);
+    void setPseudoRandomFunction(PRF prf);
 }

src/main/java/fr/xephi/authme/security/pbkdf2/PBKDF2Formatter.java

@@ -40,7 +40,7 @@ public interface PBKDF2Formatter {
      *
      * @return String representation
      */
-    public abstract String toString(PBKDF2Parameters p);
+    String toString(PBKDF2Parameters p);
 
     /**
      * Convert String to parameters. Depending on actual implementation, it may
@@ -52,5 +52,5 @@ public interface PBKDF2Formatter {
      * @return <code>false</code> syntax OK, <code>true</code> some syntax
      * issue.
      */
-    public abstract boolean fromString(PBKDF2Parameters p, String s);
+    boolean fromString(PBKDF2Parameters p, String s);
 }

src/main/java/fr/xephi/authme/security/pbkdf2/PBKDF2HexFormatter.java

@@ -47,7 +47,7 @@ public class PBKDF2HexFormatter implements PBKDF2Formatter {
         }
 
         String[] p123 = s.split(":");
-        if (p123 == null || p123.length != 3) {
+        if (p123.length != 3) {
             return true;
         }
 

src/main/java/fr/xephi/authme/security/pbkdf2/PRF.java

@@ -39,7 +39,7 @@ public interface PRF {
      * @param P The password supplied as array of bytes. It is the caller's
      *          task to convert String passwords to bytes as appropriate.
      */
-    public void init(byte[] P);
+    void init(byte[] P);
 
     /**
      * Pseudo Random Function
@@ -49,12 +49,12 @@ public interface PRF {
      *
      * @return Random bytes of hLen length.
      */
-    public byte[] doFinal(byte[] M);
+    byte[] doFinal(byte[] M);
 
     /**
      * Query block size of underlying algorithm/mechanism.
      *
      * @return block size
      */
-    public int getHLen();
+    int getHLen();
 }