AESUtil.java

package cn.mutils.core.crypto;

import android.annotation.SuppressLint;

import java.security.Key;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import cn.mutils.core.text.StringUtil;

/**
 * AES encrypt and decrypt
 */
@SuppressLint("GetInstance")
@SuppressWarnings("unused")
public class AESUtil {

    public static final String ALGORITHM = "AES";
    public static final String CIPHER_ECB = "AES/ECB/PKCS5Padding";
    public static final String CIPHER_CBC = "AES/CBC/PKCS5Padding";
    public static final String CIPHER_CBC_NO_PADDING = "AES/CBC/NoPadding";

    public static String encrypt(String text, String pwd) {
        try {
            Cipher cipher = Cipher.getInstance(CIPHER_ECB);
            cipher.init(Cipher.ENCRYPT_MODE, generateKey(pwd));
            byte[] encrypt = cipher.doFinal(text.getBytes("UTF-8"));
            return StringUtil.toHex(encrypt);
        } catch (Exception e) {
            return null;
        }
    }

    public static String decrypt(String text, String pwd) {
        try {
            Cipher cipher = Cipher.getInstance(CIPHER_ECB);
            cipher.init(Cipher.DECRYPT_MODE, generateKey(pwd));
            byte[] decrypt = cipher.doFinal(StringUtil.toBytes(text));
            return new String(decrypt, "UTF-8");
        } catch (Exception e) {
            return null;
        }
    }

    protected static Key generateKey(String pwd) throws Exception {
        return new SecretKeySpec(StringUtil.md5(pwd.getBytes("UTF-8")), ALGORITHM);
    }
}