FROMGIT: crypto: chacha20-generic - add HChaCha20 library function
Refactor the unkeyed permutation part of chacha20_block() into its own function, then add hchacha20_block() which is the ChaCha equivalent of HSalsa20 and is an intermediate step towards XChaCha20 (see https://cr.yp.to/snuffle/xsalsa-20081128.pdf ). HChaCha20 skips the final addition of the initial state, and outputs only certain words of the state. It should not be used for streaming directly. 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> (cherry picked from commit dd333449d0fb667c5250c42488a7e90470e16c77 https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master) Bug: 112008522 Test: As series, see Ic61c13b53facfd2173065be715a7ee5f3af8760b Change-Id: I5b7e92b39ada49343cbdf21e4c6d7c1aa1adf183 Signed-off-by:
Eric Biggers <ebiggers@google.com>
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