MD 5の暗号化、暗号化後の暗号化および復号化
2116 ワード
public class test {
public static String MD5(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();
}
//
public static String KL(String inStr) {
// String s = new 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;
}
//
public static String JM(String inStr) {
char [] a = inStr.toCharArray();
for ( int i = 0 ; i < a.length; i++) {
a[i] = (char ) (a[i] ^ 't' );
}
String k = new String(a);
return k;
}
//
public static void main(String args[]) {
String s = new String( "china" );
System.out.println(" :" + s);
System.out.println("MD5 :" + MD5(s));
System.out.println("MD5 :" + KL(MD5(s)));
System.out.println(" MD5 :" + JM(KL(MD5(s))));
}
}