I am using google authenticator for TOTP generation and it uses a base32 encoded string to do so.
The secret that I have is Hex encoded and I need to convert it to Base32 before I can use it.
The following site does it perfectly, but I need it in JAVA. : http://tomeko.net/online_tools/hex_to_base32.php?lang=en
I am very new to encoding and decoding. Any thoughts on how to go about it?
Okay, It was fairly simple. All I had to do was decode the Hex to a byte[] array and then encode it to Base32 using Apache Commons Codec Java library This is the code
String hexToConvert = "446a1837e14bfec34a9q0141a55ec020f73e15f4";
byte[] hexData = hexStringToByteArray(hexToConvert);
Base32 base32 = new Base32();
String encodeBase32 = base32.encodeAsString(hexData);
System.out.println("Base 32 String: " + encodeBase32);
Helper Function: this is from Convert a string representation of a hex dump to a byte array using Java?
public static byte[] hexStringToByteArray(String s) {
int len = s.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
+ Character.digit(s.charAt(i+1), 16));
}
return data;
}