Question

我尝试使用Bouncy Castle 1.58（org.bouncycastle：bcprov-jdk15on：1.58）从密码开始加密有效负载：

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 {

        Security.addProvider(new BouncyCastleProvider());

        String password = "password";

        SecureRandom randomGenerator = new SecureRandom();
        byte[] salt = randomGenerator.generateSeed(256);
        PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, 65536, 32);
        SecretKeyFactory f = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
        SecretKey passwordKey = f.generateSecret(keySpec);

        Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding", "BC");
        PBEParameterSpec parSpec = new PBEParameterSpec(salt, 65536);
        cipher.init(Cipher.ENCRYPT_MODE, passwordKey, parSpec);
    }
}

这是我得到的错误：

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

如果我将对PBKeySpec的调用中的密钥长度更改为256，如下所示：

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 {

        Security.addProvider(new BouncyCastleProvider());

        String password = "password";

        SecureRandom randomGenerator = new SecureRandom();
        byte[] salt = randomGenerator.generateSeed(256);
        PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, 65536, 256);
        SecretKeyFactory f = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
        SecretKey passwordKey = f.generateSecret(keySpec);

        Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding", "BC");
        PBEParameterSpec parSpec = new PBEParameterSpec(salt, 65536);
        cipher.init(Cipher.ENCRYPT_MODE, passwordKey, parSpec);
    }
}

然后我收到了这个错误：

Exception in thread "main" java.security.InvalidKeyException: Illegal key size
    at javax.crypto.Cipher.checkCryptoPerm(Cipher.java:1039)
    at javax.crypto.Cipher.init(Cipher.java:1393)
    at javax.crypto.Cipher.init(Cipher.java:1327)
    at tech.dashman.dashman.Scratch.main(Scratch.java:29)

我在这里缺少什么？什么尺寸应该是关键？

Answer 1

如果您想使用密钥大小为＆gt的AES，则需要安装无限加密扩展程序。 128位。例外实际上是在告诉你：

Exception in thread "main" java.security.InvalidKeyException: Illegal key size
    at javax.crypto.Cipher.checkCryptoPerm(Cipher.java:1039)
    at javax.crypto.Cipher.init(Cipher.java:1393)
    at javax.crypto.Cipher.init(Cipher.java:1327)
    at tech.dashman.dashman.Scratch.main(Scratch.java:29)

它没有检查Cipher.java第1039行的加密权限

尝试将密钥长度设置为128位或安装无限密钥强度政策，您可以下载here

密钥长度不是128/192/256位，或尝试在Java中初始化Bouncy Castle密码时的非法密钥大小

1 个答案: