双向加密 对称加密 AES算法 – 工具类

import com.open.ms.ecapaasstudystatus.constant.Constant;
import org.springframework.stereotype.Component;

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


/**
 * 双向加密 对称加密 AES算法
 */
@Component
public class AESUtils {

    /**
     * AES加密
     * @param data 要加密的字符串
     * @param key  加密key
     * @param iv   密码加密算法中的IV
     * @return 加密后的字符串
     */
        public static String encrypt(String data, String key, String iv) {
        try {

            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
            int blockSize = cipher.getBlockSize();
            byte[] dataBytes = data.getBytes();
            int plaintextLength = dataBytes.length;
            if (plaintextLength % blockSize != 0) {
                plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
            }
            byte[] plaintext = new byte[plaintextLength];
            System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), Constant.STRING_AES);
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes(Constant.STRING_UTF_8));
            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
            byte[] encrypted = cipher.doFinal(plaintext);
            String encrypt = Base64.getEncoder().encodeToString(encrypted); //BASE64加密
            encrypt = encrypt.replaceAll(new String(Constant.STRING_CARRIAGE_RETURN), Constant.STRING_BLANK);
            encrypt = encrypt.replaceAll(new String(Constant.STRING_LINE_FEED), Constant.STRING_BLANK);
            return encrypt;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


    /**
     * AES解密
     *
     * @param data 加密后的字符串
     * @param key  加密key
     * @param iv   密码加密算法中的IV
     * @return 解密后的字符串
     */
    public static String decrypt(String data, String key, String iv) {
        try {

            byte[] encrypted1 = Base64.getDecoder().decode(data); //BASE64解密
            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), Constant.STRING_AES);
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes(Constant.STRING_UTF_8));
            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original);
            return originalString;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

}