Java MD5 和 AES 加密

MD5

import java.math.BigInteger;
import java.security.MessageDigest;

import org.springframework.util.DigestUtils;

public class MD5Util {

    public static String encrypt(String str) {
        return DigestUtils.md5DigestAsHex(str.getBytes());
    }

    public static String encryptByMessageDigest(String str) {
        byte[] secretBytes;
        try {
            secretBytes = MessageDigest.getInstance("md5").digest(str.getBytes());
            StringBuilder md5code = new StringBuilder(new BigInteger(1, secretBytes).toString(16));
            for (int i = 0; i < 32 - md5code.length(); i++) {
                md5code.insert(0, "0");
            }
            return md5code.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

}

AES

import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import org.springframework.util.Base64Utils;

public class AESUtil {

    private static final String KEY = "Hancock";

    public static String encrypt(String content) {
        try {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            byte[] byteContent = content.getBytes(StandardCharsets.UTF_8);
            cipher.init(Cipher.ENCRYPT_MODE, getSecretKey());
            byte[] result = cipher.doFinal(byteContent);
            return new String(Base64Utils.encode(result));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static String decrypt(String content) {
        try {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, getSecretKey());
            byte[] result = cipher.doFinal(Base64Utils.decode(content.getBytes()));
            return new String(result, StandardCharsets.UTF_8);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    private static SecretKeySpec getSecretKey() {
        KeyGenerator kg;
        try {
            kg = KeyGenerator.getInstance("AES");
            kg.init(128, new SecureRandom(KEY.getBytes()));
            SecretKey secretKey = kg.generateKey();
            return new SecretKeySpec(secretKey.getEncoded(), "AES");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }

}