Obfuscates text with secret and returns a string of the same length; running it again with the same secret gives the
text back. This hides text from a casual look and is not encryption.
scramble :: (text: string, secret: string) -> stringBoth strings may only contain space, !, the digits, and ASCII letters; any other character fails an assertion, as does a
non-empty text with an empty secret. Each character is XORed with the matching character of secret, which repeats
as needed, within that 64-character alphabet. The result is in temporary storage: it is not freed by the caller and is
invalid after the temporary storage is reset, so copy it to keep it.
Parameters
- text: string
- secret: string
Returns
- string
text := "Az 19!aZ0";
hidden := scramble(text, "A!z");
assert(hidden.count == text.count);
assert(hidden != text);
assert(scramble(hidden, "A!z") == text);