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lib/crypto: blake2s: move hmac construction into wireguard

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commit d8d83d8ab0a453e17e68b3a3bed1f940c34b8646 upstream.

Basically nobody should use blake2s in an HMAC construction; it already
has a keyed variant. But unfortunately for historical reasons, Noise,
used by WireGuard, uses HKDF quite strictly, which means we have to use
this. Because this really shouldn't be used by others, this commit moves
it into wireguard's noise.c locally, so that kernels that aren't using
WireGuard don't get this superfluous code baked in. On m68k systems,
this shaves off ~314 bytes.

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason A. Donenfeld
2022-01-11 14:37:41 +01:00
committed by Greg Kroah-Hartman
parent 62531d446a
commit 5fb6a3ba3a
4 changed files with 39 additions and 77 deletions
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3
include/crypto/blake2s.h
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@@ -101,7 +101,4 @@ static inline void blake2s(u8 *out, const u8 *in, const u8 *key,
blake2s_final(&state, out);
}
void blake2s256_hmac(u8 *out, const u8 *in, const u8 *key, const size_t inlen,
const size_t keylen);
#endif /* _CRYPTO_BLAKE2S_H */