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author | Eric Biggers <ebiggers@google.com> | 2018-11-17 02:26:21 +0100 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-11-20 07:26:55 +0100 |
commit | 1ca1b917940c24ca3d1f490118c5474168622953 (patch) | |
tree | 26cde5a85d0792a8dd709a6f5316f76af8801a35 /Documentation/scsi | |
parent | crypto: chacha20-generic - add XChaCha20 support (diff) | |
download | linux-1ca1b917940c24ca3d1f490118c5474168622953.tar.xz linux-1ca1b917940c24ca3d1f490118c5474168622953.zip |
crypto: chacha20-generic - refactor to allow varying number of rounds
In preparation for adding XChaCha12 support, rename/refactor
chacha20-generic to support different numbers of rounds. The
justification for needing XChaCha12 support is explained in more detail
in the patch "crypto: chacha - add XChaCha12 support".
The only difference between ChaCha{8,12,20} are the number of rounds
itself; all other parts of the algorithm are the same. Therefore,
remove the "20" from all definitions, structures, functions, files, etc.
that will be shared by all ChaCha versions.
Also make ->setkey() store the round count in the chacha_ctx (previously
chacha20_ctx). The generic code then passes the round count through to
chacha_block(). There will be a ->setkey() function for each explicitly
allowed round count; the encrypt/decrypt functions will be the same. I
decided not to do it the opposite way (same ->setkey() function for all
round counts, with different encrypt/decrypt functions) because that
would have required more boilerplate code in architecture-specific
implementations of ChaCha and XChaCha.
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'Documentation/scsi')
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