Android AES加密工具类

package com.gyc.ls_myself_project.util;import java.io.UnsupportedEncodingException;import javax.crypto.Cipher;import javax.crypto.spec.SecretKeySpec;/** * Created by ${ls} on 2017/7/31. * AES对称加密解密类 **/public class EncryptUtil {    /*   算法/模式/填充 */    private static final String CipherMode = "AES/ECB/PKCS5Padding";    /*  创建密钥  */    private static SecretKeySpec createKey(String password) {        byte[] data = null;        if (password == null) {            password = "";        }        StringBuffer sb = new StringBuffer(32);        sb.append(password);        while (sb.length() < 32) {            sb.append("0");        }        if (sb.length() > 32) {            sb.setLength(32);        }        try {            data = sb.toString().getBytes("UTF-8");        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }        return new SecretKeySpec(data, "AES");    }    /* 加密字节数据  */    public static byte[] encrypt(byte[] content, String password) {        try {            SecretKeySpec key = createKey(password);            System.out.println(key);            Cipher cipher = Cipher.getInstance(CipherMode);            cipher.init(Cipher.ENCRYPT_MODE, key);            byte[] result = cipher.doFinal(content);            return result;        } catch (Exception e) {            e.printStackTrace();        }        return null;    }    /*加密(结果为16进制字符串)  */    public static String encrypt(String content, String password) {        byte[] data = null;        try {            data = content.getBytes("UTF-8");        } catch (Exception e) {            e.printStackTrace();        }        data = encrypt(data, password);        String result = byte2hex(data);        return result;    }    /*解密字节数组*/    public static byte[] decrypt(byte[] content, String password) {        try {            SecretKeySpec key = createKey(password);            Cipher cipher = Cipher.getInstance(CipherMode);            cipher.init(Cipher.DECRYPT_MODE, key);            byte[] result = cipher.doFinal(content);            return result;        } catch (Exception e) {            e.printStackTrace();        }        return null;    }    /*解密16进制的字符串为字符串  */    public static String decrypt(String content, String password) {        byte[] data = null;        try {            data = hex2byte(content);        } catch (Exception e) {            e.printStackTrace();        }        data = decrypt(data, password);        if (data == null) return null;        String result = null;        try {            result = new String(data, "UTF-8");        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }        return result;    }    /*字节数组转成16进制字符串  */    public static String byte2hex(byte[] b) { // 一个字节的数，        StringBuffer sb = new StringBuffer(b.length * 2);        String tmp = "";        for (int n = 0; n < b.length; n++) {            // 整数转成十六进制表示            tmp = (java.lang.Integer.toHexString(b[n] & 0XFF));            if (tmp.length() == 1) {                sb.append("0");            }            sb.append(tmp);        }        return sb.toString().toUpperCase(); // 转成大写    }    /*将hex字符串转换成字节数组 */    private static byte[] hex2byte(String inputString) {        if (inputString == null || inputString.length() < 2) {            return new byte[0];        }        inputString = inputString.toLowerCase();        int l = inputString.length() / 2;        byte[] result = new byte[l];        for (int i = 0; i < l; ++i) {            String tmp = inputString.substring(2 * i, 2 * i + 2);            result[i] = (byte) (Integer.parseInt(tmp, 16) & 0xFF);        }        return result;    }}