Twofishによる暗号化/復号化

Question

TWOFISHを使用して暗号化と復号化を試みています。 は、私はエラーを受け取っ：スレッド "メイン" java.security.NoSuchAlgorithmExceptionで例外：twofishですのKeyGeneratorは利用できません

マイコード：

public class TWOFISH { 

    public static byte[] encrypt(String toEncrypt, String key) throws Exception { 
     // create a binary key from the argument key (seed) 
     SecureRandom sr = new SecureRandom(key.getBytes()); 
     KeyGenerator kg = KeyGenerator.getInstance("twofish"); 
     kg.init(sr); 
     SecretKey sk = kg.generateKey(); 

     // create an instance of cipher 
     Cipher cipher = Cipher.getInstance("twofish"); 

     // initialize the cipher with the key 
     cipher.init(Cipher.ENCRYPT_MODE, sk); 

     // enctypt! 
     byte[] encrypted = cipher.doFinal(toEncrypt.getBytes()); 

     return encrypted; 
    } 

    public static String decrypt(byte[] toDecrypt, String key) throws Exception { 
     // create a binary key from the argument key (seed) 
     SecureRandom sr = new SecureRandom(key.getBytes()); 
     KeyGenerator kg = KeyGenerator.getInstance("twofish"); 
     kg.init(sr); 
     SecretKey sk = kg.generateKey(); 

     // do the decryption with that key 
     Cipher cipher = Cipher.getInstance("twofish"); 
     cipher.init(Cipher.DECRYPT_MODE, sk); 
     byte[] decrypted = cipher.doFinal(toDecrypt); 

     return new String(decrypted); 
    } 
} 

Answer 1

KeyGenerator kg = KeyGenerator.getInstance(String algorithm); 

を

https://docs.oracle.com/javase/8/docs/technotes/guides/security/StandardNames.html#KeyGenerator

によると、

が受け入れられましたStringパラの値メーターalgorithmには"twofish"が含まれていません。