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>
parent
3d234b33
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