java怎么實現AES的五種加密模式

在Java中，可以使用Java Cryptography Architecture (JCA)來實現AES的五種加密模式。以下是一些示例代碼：

電子密碼本模式 (Electronic Codebook Mode, ECB)

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;

public class AESExample {
    public static void main(String[] args) throws Exception {
        String plaintext = "Hello, World!";
        String key = "0123456789abcdef"; // 16字節的AES密鑰

        SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);

        byte[] encryptedBytes = cipher.doFinal(plaintext.getBytes());
        String encryptedText = Base64.getEncoder().encodeToString(encryptedBytes);

        System.out.println("Encrypted Text: " + encryptedText);
    }
}

密碼分組鏈接模式 (Cipher Block Chaining Mode, CBC)

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;

public class AESExample {
    public static void main(String[] args) throws Exception {
        String plaintext = "Hello, World!";
        String key = "0123456789abcdef"; // 16字節的AES密鑰
        String iv = "fedcba9876543210"; // 16字節的初始化向量

        SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "AES");
        IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivSpec);

        byte[] encryptedBytes = cipher.doFinal(plaintext.getBytes());
        String encryptedText = Base64.getEncoder().encodeToString(encryptedBytes);

        System.out.println("Encrypted Text: " + encryptedText);
    }
}

密文反饋模式 (Cipher Feedback Mode, CFB)

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;

public class AESExample {
    public static void main(String[] args) throws Exception {
        String plaintext = "Hello, World!";
        String key = "0123456789abcdef"; // 16字節的AES密鑰
        String iv = "fedcba9876543210"; // 16字節的初始化向量

        SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "AES");
        IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());
        Cipher cipher = Cipher.getInstance("AES/CFB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivSpec);

        byte[] encryptedBytes = cipher.doFinal(plaintext.getBytes());
        String encryptedText = Base64.getEncoder().encodeToString(encryptedBytes);

        System.out.println("Encrypted Text: " + encryptedText);
    }
}

輸出反饋模式 (Output Feedback Mode, OFB)

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;

public class AESExample {
    public static void main(String[] args) throws Exception {
        String plaintext = "Hello, World!";
        String key = "0123456789abcdef"; // 16字節的AES密鑰
        String iv = "fedcba9876543210"; // 16字節的初始化向量

        SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "AES");
        IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());
        Cipher cipher = Cipher.getInstance("AES/OFB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivSpec);

        byte[] encryptedBytes = cipher.doFinal(plaintext.getBytes());
        String encryptedText = Base64.getEncoder().encodeToString(encryptedBytes);

        System.out.println("Encrypted Text: " + encryptedText);
    }
}

計數器模式 (Counter Mode, CTR)

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;

public class AESExample {
    public static void main(String[] args) throws Exception {
        String plaintext = "Hello, World!";
        String key = "0123456789abcdef"; // 16字節的AES密鑰
        String iv = "fedcba9876543210"; // 16字節的初始化向量

        SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "

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