AndroidMD5加密算法(可逆)

//MD5加密，32位

public static String MD5(String str){

MessageDigest md5 = null;

try{

md5 = MessageDigest.getInstance("MD5");

}catch(Exception e){

e.printStackTrace();

return "";

}

char[] charArray = str.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();

}

// 可逆的加密算法

public static String encryptmd5(String str) {

char[] a = str.toCharArray();

for (int i = 0; i < a.length; i++)

{

a[i] = (char) (a[i] ^ 'l');

}

String s = new String(a);

return s;

}

}