I think this is a form of symmetric encryption where the passphrase (e.g. "ICE")
is repeated (e.g. "ICEICEICEICEI...") until it matches the length of the
cleartext string; after that, the two byte-strings are XOR'd against one another
and then encoded as hexadecimal creating the ciphertext.
Change-Id: Ib148f06d6c42a41377d1df1f0738d77da935a9f6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4789
Tested-by: BuildkiteCI
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
