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HexConverter.java
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HexConverter.java
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import java.math.BigInteger;
import java.lang.*;
import javax.xml.bind.DatatypeConverter;
/*
* HexConverter converts other numeric types to hex and vice versa.
* Bytes, base 64, string.
*/
public class HexConverter {
//constructor
public HexConverter(){
}
/**
* Changes hexadecimal to base 64
*
* @param hex the hexadecimal value to convert
* @return the base64 value
*/
public String HexToBase64(String hex){
byte[] byteArray=DatatypeConverter.parseHexBinary(hex);
String base64String=DatatypeConverter.printBase64Binary(byteArray);
return base64String;
}
/**
* Converts strings (in ascii) to hexadecimal
*
* @param message the string to convert
* @return the hexadecimal string
*/
public String StringToHex(String message){
try {
return String.format("%x", new BigInteger(
message.getBytes("US-ASCII")));
}
catch(Exception e) {
System.out.print(e.toString());
return message;
}
}
/**
* Another way to converter string to hexadecimal
*
* @param message the string to convert
* @return the hexadecimal string of the message
*/
public String StringToHex2(String message){
return String.format("%x", new BigInteger(message.getBytes()));
}
/**
* Converts hexadecimal values to a byte array
* Used for bitwise operation
*
* @param hex the hexadecimal value to change
* @return the byte array
*/
public byte[] HexToByteArray(String hex){
byte[] byteArray=DatatypeConverter.parseHexBinary(hex);
return byteArray;
}
/**
* Converts hexadecimal values to string values
*
* @param hexa the hexadecimal value to change
* @return the string
*/
public String hexToString(String hexa){
StringBuilder sb = new StringBuilder();
StringBuilder temp = new StringBuilder();
//49204c6f7665204a617661 split into two characters 49, 20, 4c...
for( int i=0; i<hexa.length()-1; i+=2 ){
//grab the hex in pairs
String output = hexa.substring(i, (i + 2));
//convert hex to decimal
int decimal = Integer.parseInt(output, 16);
//convert the decimal to character
sb.append((char)decimal);
temp.append(decimal);
}
return sb.toString();
}
}