public byte[] XOR(byte[] data)
{
byte[] keyBytes = ToBytes();
var keyHash = PromiseUtils.SHA512(keyBytes, 0, keyBytes.Length);
var encrypted = new byte[data.Length];
for (int i = 0; i < encrypted.Length; i++)
{
encrypted[i] = (byte)(data[i] ^ keyHash[i % keyHash.Length]);
}
return(encrypted);
}
public static byte[] XOR(byte[] data1, byte[] data2)
{
/*
* Given how the "key" that XOR generates is not the same as the one
* used in XOR anymore (check step 5), we can't use the "ToBytes()" function since
* it assumes that the "key" in the XOR step has a size less than N (or "KeySize").
* So I can either remove the call to the padding function in "ToBytes()" and use
* the normal XOR function above, or use this independent function and not change
* anything.
*
* If the second choice is better, then this function should move to "Utils" and
* XOR is no longer needed in PromiseClientSession\PromiseServerSession since the
* key can be generated directly using "Utils.GenerateEncryptableInteger()".
*/
var keyHash = PromiseUtils.SHA512(data1, 0, data1.Length);
var encrypted = new byte[data2.Length];
for (int i = 0; i < encrypted.Length; i++)
{
encrypted[i] = (byte)(data2[i] ^ keyHash[i % keyHash.Length]);
}
return(encrypted);
}