#358 Create encryption method supertypes, add new methods

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

@@ -0,0 +1,35 @@
+package fr.xephi.authme.security.crypts;
+
+/**
+ * Common supertype for encryption methods which store their salt separately from the hash.
+ */
+public abstract class SeparateSaltMethod implements NewEncrMethod {
+
+    @Override
+    public abstract String computeHash(String password, String salt, String name);
+
+    @Override
+    public abstract String generateSalt();
+
+    @Override
+    public HashResult computeHash(String password, String name) {
+        String salt = generateSalt();
+        return new HashResult(computeHash(password, salt, name), salt);
+    }
+
+    @Override
+    public boolean comparePassword(String hash, String password, String salt, String name) {
+        return hash.equals(computeHash(password, salt, null));
+    }
+
+    @Override
+    public boolean hasSeparateSalt() {
+        return true;
+    }
+
+    @Override
+    @Deprecated
+    public boolean comparePassword(String hash, String password, String playerName) {
+        return false;
+    }
+}