#1627 Replace BCryptService with Maven dependency (#1629)

* #1627 Replace BCryptService with Maven dependency
- Remove BCryptService in favor of a better BCrypt implementation (Maven dependency)
- Introduce BCryptHasher wrapping the dependency with more suitable methods
- Fix inaccurate details about salt length in docu annotation: for BCrypt it's always 22 chars
- Change phpBB hash to produce 2y hashes instead of 2a

* #1627 Use UTF-8 encoding when (dis)assembling Strings

* #1627 Small test additions

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

@@ -0,0 +1,48 @@
+package fr.xephi.authme.security.crypts;
+
+import fr.xephi.authme.security.crypts.description.HasSalt;
+import fr.xephi.authme.security.crypts.description.Recommendation;
+import fr.xephi.authme.security.crypts.description.SaltType;
+import fr.xephi.authme.security.crypts.description.Usage;
+
+import static fr.xephi.authme.security.crypts.BCryptHasher.SALT_LENGTH_ENCODED;
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+/**
+ * Abstract parent for BCrypt-based hash algorithms.
+ */
+@Recommendation(Usage.RECOMMENDED)
+@HasSalt(value = SaltType.TEXT, length = SALT_LENGTH_ENCODED)
+public abstract class BCryptBasedHash implements EncryptionMethod {
+
+    private final BCryptHasher bCryptHasher;
+
+    public BCryptBasedHash(BCryptHasher bCryptHasher) {
+        this.bCryptHasher = bCryptHasher;
+    }
+
+    @Override
+    public HashedPassword computeHash(String password, String name) {
+        return bCryptHasher.hash(password);
+    }
+
+    @Override
+    public String computeHash(String password, String salt, String name) {
+        return bCryptHasher.hashWithRawSalt(password, salt.getBytes(UTF_8));
+    }
+
+    @Override
+    public boolean comparePassword(String password, HashedPassword hashedPassword, String name) {
+        return BCryptHasher.comparePassword(password, hashedPassword.getHash());
+    }
+
+    @Override
+    public String generateSalt() {
+        return BCryptHasher.generateSalt();
+    }
+
+    @Override
+    public boolean hasSeparateSalt() {
+        return false;
+    }
+}