JAVA——AES加密解密

import javax.crypto.*;
import java.nio.charset.Charset;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

public class AESUtil {
    static final String ALGORITHM = "AES";
    static final Charset charset = Charset.forName("UTF-8");

    /**
     * 生成密钥
     *
     * @return 密钥
     */
    public static SecretKey generateKey() throws NoSuchAlgorithmException {
        KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM);
        SecureRandom secureRandom = new SecureRandom();
        keyGenerator.init(secureRandom);
        SecretKey secretKey = keyGenerator.generateKey();
        return secretKey;
    }

    /**
     * 加密
     *
     * @param 待加密内容
     * @param 密钥
     * @return 加密后比特数组
     */
    public static byte[] encrypt(String content, SecretKey secretKey) throws IllegalBlockSizeException, InvalidKeyException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException {
        return aes(content.getBytes(charset), Cipher.ENCRYPT_MODE, secretKey);
    }

    /**
     * 解密
     *
     * @param 加密内容
     * @param 密钥
     * @return 解密后字符串
     */
    public static String decrypt(byte[] contentArray, SecretKey secretKey) throws IllegalBlockSizeException, InvalidKeyException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException {
        byte[] result = aes(contentArray, Cipher.DECRYPT_MODE, secretKey);
        return new String(result, charset);
    }

    private static byte[] aes(byte[] content, int mode, SecretKey secretKey) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(mode, secretKey);
        byte[] result = cipher.doFinal(content);
        return result;
    }
}