JavaでBouncy Castle暗号を初期化しようとすると鍵長が128/192/256ではない

Question

Bouncy Castle 1.58（org.bouncycastle：bcprov-jdk15on：1.58）を使用してパスワードからペイロードを暗号化しようとしています：

import org.bouncycastle.jce.provider.BouncyCastleProvider; 

import javax.crypto.Cipher; 
import javax.crypto.SecretKey; 
import javax.crypto.SecretKeyFactory; 
import javax.crypto.spec.PBEKeySpec; 
import javax.crypto.spec.PBEParameterSpec; 
import java.security.SecureRandom; 
import java.security.Security; 

public class Scratch { 
    public static void main(String[] args) throws Exception { 
     int keyLength = 128; 

     Security.addProvider(new BouncyCastleProvider()); 

     String password = "password"; 

     SecureRandom randomGenerator = new SecureRandom(); 
     byte[] salt = randomGenerator.generateSeed(128/8); 
     PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, 872791, keyLength); 
     SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA512"); 
     SecretKey passwordKey = secretKeyFactory.generateSecret(keySpec); 
     System.out.println("passwordKey: " + passwordKey); 
     System.out.println("passwordKey.getEncoded(): " + Arrays.toString(passwordKey.getEncoded())); 
     System.out.println("passwordKey.getEncoded().length: " + passwordKey.getEncoded().length); 
     System.out.println("passwordKey.getFormat():" + passwordKey.getFormat()); 
     System.out.println("passwordKey.getAlgorithm(): " + passwordKey.getAlgorithm()); 

     Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding", "BC"); 
     PBEParameterSpec parSpec = new PBEParameterSpec(salt, 872791); 
     cipher.init(Cipher.ENCRYPT_MODE, passwordKey, parSpec); 
    } 
} 

、これは私が取得エラーです：

Exception in thread "main" org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher$InvalidKeyOrParametersException: Key length not 128/192/256 bits. 
    at org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher.engineInit(Unknown Source) 
    at javax.crypto.Cipher.init(Cipher.java:1394) 
    at javax.crypto.Cipher.init(Cipher.java:1327) 
    at tech.dashman.dashman.Scratch.main(Scratch.java:30) 
Caused by: java.lang.IllegalArgumentException: Key length not 128/192/256 bits. 
    at org.bouncycastle.crypto.engines.AESEngine.generateWorkingKey(Unknown Source) 
    at org.bouncycastle.crypto.engines.AESEngine.init(Unknown Source) 
    at org.bouncycastle.crypto.modes.GCMBlockCipher.init(Unknown Source) 
    at org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher$AEADGenericBlockCipher.init(Unknown Source) 
    ... 4 more 

およびデバッグ出力は次のようになります。

passwordKey: com.sun.crypto.provider.PBKDF2KeyImpl@f00a68fe 
passwordKey.getEncoded(): [122, -75, -99, 114, -123, 71, 6, 50, 45, 64, -97, 10, -66, 7, 110, 17] 
passwordKey.getEncoded().length: 16 
passwordKey.getFormat():RAW 
passwordKey.getAlgorithm(): PBKDF2WithHmacSHA512 

何A私は行方不明ですか？

Answer 1

問題が見つかりました。私は秘密鍵の工場を取得するときにプロバイダを指定していませんでした。交換：この例の作品を作った

SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA512", "BC"); 

ため

SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA512"); 

を。 AESについては

Answer 2

あなたはPBE秘密鍵に基づいていますAES秘密鍵を、必要とする：

SecretKeyFactory secKeyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA512"); 
KeySpec spec = new PBEKeySpec(password, salt, iterations, 128); 
SecretKey pbeSecretKey = secKeyFactory.generateSecret(spec); 
SecretKey aesSecret = new SecretKeySpec(pbeSecretKey.getEncoded(), "AES"); 

Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding","BC");