chacha20poly1305: Add ChaCha8/ChaCha12 reduced round variants #69
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Adds `ChaCha8Poly1305` and `ChaCha12Poly1305` AEADs, gated under the (off-by-default) `reduced-round` cargo feature. See the writeup I've already done for the `rand_chacha` crate for the rationale of including these by default: rust-random/rand#932 tl;dr: the "Too Much Crypto" paper goes into why ChaCha20 is overkill, ChaCha12 is probably what should've been standardized per the eSTREAM analysis of Salsa20 (but wasn't for cargo cult reasons), and ChaCha8 is still probably safe: https://eprint.iacr.org/2019/1492
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Adds
ChaCha8Poly1305andChaCha12Poly1305AEADs, gated under the (off-by-default)reduced-roundcargo feature.See the writeup I've already done for the
rand_chachacrate for the rationale of including these by default:rust-random/rand#932
tl;dr: the "Too Much Crypto" paper goes into why ChaCha20 is overkill, ChaCha12 is probably what should've been standardized per the eSTREAM analysis of Salsa20 (but wasn't for cargo cult reasons), and ChaCha8 is still probably safe:
https://eprint.iacr.org/2019/1492