JavaでAESの5つの暗号モードを実現する方法は何ですか？

Javaでは、Java Cryptography Architecture (JCA)を使用して、AESの5つの暗号モードを実装することができます。以下はいくつかのサンプルコードです：

1. 電子コードブックモード (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字节的AES密钥

        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);
    }
}

1. 暗号ブロック連鎖モード（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字节的AES密钥
        String iv = "fedcba9876543210"; // 16字节的初始化向量

        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);
    }
}

1. 暗号フィードバックモード (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字节的AES密钥
        String iv = "fedcba9876543210"; // 16字节的初始化向量

        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);
    }
}

1. 出力フィードバックモード（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字节的AES密钥
        String iv = "fedcba9876543210"; // 16字节的初始化向量

        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);
    }
}

1. カウンターモード (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字节的AES密钥
        String iv = "fedcba9876543210"; // 16字节的初始化向量

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