KAFKA-18374 Remove EncryptingPasswordEncoder, CipherParamsEncoder, Gc…

…mParamsEncoder, IvParamsEncoder, and the unused static variables in PasswordEncoder (#18355)

Reviewers: TengYao Chi <kitingiao@gmail.com>, TaiJuWu <tjwu1217@gmail.com>, Christo Lolov <lolovc@amazon.com>, PoAn Yang <payang@apache.org>, Chia-Ping Tsai <chia7712@gmail.com>

server-common/src/main/java/org/apache/kafka/security/PasswordEncoder.java

@@ -19,19 +19,8 @@
 import org.apache.kafka.common.config.types.Password;
 
 import java.security.GeneralSecurityException;
-import java.util.Base64;
 
 public interface PasswordEncoder {
-
-    String KEY_FACTORY_ALGORITHM = "keyFactoryAlgorithm";
-    String CIPHER_ALGORITHM = "cipherAlgorithm";
-    String INITIALIZATION_VECTOR = "initializationVector";
-    String KEY_LENGTH = "keyLength";
-    String SALT = "salt";
-    String ITERATIONS = "iterations";
-    String ENCRYPTED_PASSWORD = "encryptedPassword";
-    String PASSWORD_LENGTH = "passwordLength";
-
     /**
      * A password encoder that does not modify the given password. This is used in KRaft mode only.
      */
@@ -48,22 +37,6 @@ public Password decode(String encodedPassword) {
         }
     };
 
-    static byte[] base64Decode(String encoded) {
-        return Base64.getDecoder().decode(encoded);
-    }
-
-    static String base64Encode(byte[] bytes) {
-        return Base64.getEncoder().encodeToString(bytes);
-    }
-
-    static EncryptingPasswordEncoder encrypting(Password secret,
-                   String keyFactoryAlgorithm,
-                   String cipherAlgorithm,
-                   int keyLength,
-                   int iterations) {
-        return new EncryptingPasswordEncoder(secret, keyFactoryAlgorithm, cipherAlgorithm, keyLength, iterations);
-    }
-
     String encode(Password password) throws GeneralSecurityException;
     Password decode(String encodedPassword) throws GeneralSecurityException;
 }