android 加密解密一

来源：互联网发布：淘宝经营地址怎么填写编辑：程序博客网时间：2024/06/04 18:03
 MessageDigest.getInstance("MD5");//支持类型 MD5/SHApublic class MD5Util {    /***     * MD5加码 生成32位md5码     */    public static String string2MD5(String inStr){        MessageDigest md5 = null;        try{            md5 = MessageDigest.getInstance("MD5");        }catch (Exception e){            System.out.println(e.toString());            e.printStackTrace();            return "";        }        char[] charArray = inStr.toCharArray();        byte[] byteArray = new byte[charArray.length];        for (int i = 0; i < charArray.length; i++)            byteArray[i] = (byte) charArray[i];        byte[] md5Bytes = md5.digest(byteArray);        StringBuffer hexValue = new StringBuffer();        for (int i = 0; i < md5Bytes.length; i++){            int val = ((int) md5Bytes[i]) & 0xff;            if (val < 16)                hexValue.append("0");            hexValue.append(Integer.toHexString(val));        }        return hexValue.toString();    }    /**     * 加密解密算法 执行一次加密，两次解密     */    public static String convertMD5(String inStr){        char[] a = inStr.toCharArray();        for (int i = 0; i < a.length; i++){            a[i] = (char) (a[i] ^ 't');        }        String s = new String(a);        return s;    }    // 测试主函数    public static void main(String args[]) {        String s = new String("tangfuqiang");        System.out.println("原始：" + s);        System.out.println("MD5后：" + string2MD5(s));        System.out.println("加密的：" + convertMD5(s));        System.out.println("解密的：" + convertMD5(convertMD5(s)));    }}
Base64 
public class Base64Utils  {    public String base64Encode(String value){        if (value==null||value.length()<2){            return  null;        }      String  encode = Base64.encodeToString(value.getBytes(), Base64.DEFAULT);     //   String decodedString =new String(Base64.decode(encode,Base64.DEFAULT));        return  encode;    }}
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