java aes256

以下是Java中使用AES-256加密解密的示例代码：

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

public class AESUtil {

    private static final String KEY_ALGORITHM = "AES";
    private static final String CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding";
    private static final String CHARSET_NAME = "UTF-8";

    /**
     * AES加密
     *
     * @param content  待加密内容
     * @param password 密钥
     * @param iv       向量
     * @return 加密后的字符串
     */
    public static String encrypt(String content, String password, String iv) {
        try {
            Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
            byte[] raw = password.getBytes(CHARSET_NAME);
            SecretKeySpec skeySpec = new SecretKeySpec(raw, KEY_ALGORITHM);
            IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes(CHARSET_NAME));
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, ivParameterSpec);
            byte[] encrypted = cipher.doFinal(content.getBytes(CHARSET_NAME));
            return Base64.getEncoder().encodeToString(encrypted);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * AES解密
     *
     * @param content  待解密内容
     * @param password 密钥
     * @param iv       向量
     * @return 解密后的字符串
     */
    public static String decrypt(String content, String password, String iv) {
        try {
            Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
            byte[] raw = password.getBytes(CHARSET_NAME);
            SecretKeySpec skeySpec = new SecretKeySpec(raw, KEY_ALGORITHM);
            IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes(CHARSET_NAME));
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, ivParameterSpec);
            byte[] encrypted = Base64.getDecoder().decode(content);
            byte[] original = cipher.doFinal(encrypted);
            return new String(original, CHARSET_NAME);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

使用示例：

public class Test {
    public static void main(String[] args) {
        String content = "Hello, world!";
        String password = "12345678901234567890123456789012";
        String iv = "1234567890123456";
        String encrypted = AESUtil.encrypt(content, password, iv);
        System.out.println("加密后的内容：" + encrypted);
        String decrypted = AESUtil.decrypt(encrypted, password, iv);
        System.out.println("解密后的内容：" + decrypted);
    }
}