Eric Biggers 2f944c66ae fscrypt: write CBC-CTS instead of CTS-CBC
Calling CBC with ciphertext stealing "CBC-CTS" seems to be more common
than calling it "CTS-CBC".  E.g., CBC-CTS is used by OpenSSL, Crypto++,
RFC3962, and RFC6803.  The NIST SP800-38A addendum uses CBC-CS1,
CBC-CS2, and CBC-CS3, distinguishing between different CTS conventions
but similarly putting the CBC part first.  In the interest of avoiding
any idiosyncratic terminology, update the fscrypt documentation and the
fscrypt_mode "friendly names" to align with the more common convention.

Changing the "friendly names" only affects some log messages.  The
actual mode constants in the API are unchanged; those call it simply
"CTS".  Add a note to the documentation that clarifies that "CBC" and
"CTS" in the API really mean CBC-ESSIV and CBC-CTS, respectively.

Link: https://lore.kernel.org/r/20240224053550.44659-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
2024-02-23 21:38:59 -08:00
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