AES 對稱加解密 Java代碼實作

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
/**
 * AES 對稱加解密
 * @since 2019/9/9
 * @author Lee
 */
public class AESCBCUtil {
    private static final Logger LOGGER = LoggerFactory.getLogger(AESCBCUtil.class);
    private static final String ENCODING = "GBK";

    private static final String KEY_ALGORITHM = "AES";
    /**
     * 加解密算法/工作模式/填充方式
     */
    private static final String DEFAULT_CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding";
    /**
     * 填充向量
     */
    private static final String FILL_VECTOR = "1234560405060708";

    /**
     * 加密字元串
     *
     * @param content  字元串
     * @param password 密鑰KEY
     * @return
     * @throws Exception
     */
    public static String encrypt(String content, String password) {
        if (StringUtils.isAnyEmpty(content, password)) {
            LOGGER.error("AES encryption params is null");
            return null;
        }

        byte[] raw = password.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, KEY_ALGORITHM);
        Cipher cipher = null;
        try {
            cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
            IvParameterSpec iv = new IvParameterSpec(FILL_VECTOR.getBytes());
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
            byte[] anslBytes = content.getBytes(ENCODING);
            byte[] encrypted = cipher.doFinal(anslBytes);
            return byte2hex(encrypted).toUpperCase();
        } catch (Exception e) {
            LOGGER.error("AES encryption operation has exception,content:{},password:{}", content, password, e);
            return null;
        }
    }

    /**
     * 解密
     *
     * @param content  解密前的字元串
     * @param password 解密KEY
     * @return
     * @throws Exception
     */
    public static String decrypt(String content, String password) {
        if (StringUtils.isAnyEmpty(content, password)) {
            LOGGER.error("AES decryption params is null");
            return null;
        }
        try {
            byte[] raw = password.getBytes();
            SecretKeySpec skeySpec = new SecretKeySpec(raw, KEY_ALGORITHM);
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
            IvParameterSpec iv = new IvParameterSpec(FILL_VECTOR.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] encrypted1 = hex2byte(content);
            byte[] original = cipher.doFinal(encrypted1);
            return new String(original, ENCODING);
        }
        catch (Exception e) {
            LOGGER.warn("AES decryption operation has exception,content:{},password:{}", content, password);
            return null;
        }
    }

    public static byte[] hex2byte(String strhex) {
        if (strhex == null) {
            return null;
        }
        int l = strhex.length();
        if (l % 2 == 1) {
            return null;
        }
        byte[] b = new byte[l / 2];
        for (int i = 0; i != l / 2; i++) {
            b[i] = (byte) Integer.parseInt(strhex.substring(i * 2, i * 2 + 2), 16);
        }
        return b;
    }

    public static String byte2hex(byte[] b) {
        String hs = "";
        String stmp = "";
        for (int n = 0; n < b.length; n++) {
            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
            if (stmp.length() == 1) {
                hs = hs + "0" + stmp;
            } else {
                hs = hs + stmp;
            }
        }
        return hs.toUpperCase();
    }

    public static void main(String[] args) throws Exception {
        //805320845A8DE00A5A2E0CADF318B51B
        String str = "阿斯頓發了的";
        //必須為16位
        String key = "bde1e4583b5d4e61";
//        System.out.println(AESCBCUtil.byte2hex());
        String keyss = "bde1e4583b5d4e61";
        //生成加密密鑰
//        String key2 = byte2hex(key.getBytes());
//        System.out.println(key2);
        //String key23 = byte2hex(keyss.getBytes());
        //System.out.println(key);
        String encryptStr = encrypt(str, key);
//        System.out.println(encryptStr);
        System.out.println(decrypt(encryptStr, keyss));
    }
}