diff options
| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2021-12-31 09:26:08 +0100 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2022-01-07 00:25:25 +0100 |
| commit | 96562f286884e2db89c74215b199a1084b5fb7f7 (patch) | |
| tree | 7f083a6e760685b8e5beeda8c00e130891e9f937 /include/crypto | |
| parent | 7b87324112df2e1f9b395217361626362dcfb9fb (diff) | |
| download | linux-96562f286884e2db89c74215b199a1084b5fb7f7.tar.bz2 | |
random: early initialization of ChaCha constants
Previously, the ChaCha constants for the primary pool were only
initialized in crng_initialize_primary(), called by rand_initialize().
However, some randomness is actually extracted from the primary pool
beforehand, e.g. by kmem_cache_create(). Therefore, statically
initialize the ChaCha constants for the primary pool.
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: <linux-crypto@vger.kernel.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Diffstat (limited to 'include/crypto')
| -rw-r--r-- | include/crypto/chacha.h | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/include/crypto/chacha.h b/include/crypto/chacha.h index dabaee698718..b3ea73b81944 100644 --- a/include/crypto/chacha.h +++ b/include/crypto/chacha.h @@ -47,12 +47,19 @@ static inline void hchacha_block(const u32 *state, u32 *out, int nrounds) hchacha_block_generic(state, out, nrounds); } +enum chacha_constants { /* expand 32-byte k */ + CHACHA_CONSTANT_EXPA = 0x61707865U, + CHACHA_CONSTANT_ND_3 = 0x3320646eU, + CHACHA_CONSTANT_2_BY = 0x79622d32U, + CHACHA_CONSTANT_TE_K = 0x6b206574U +}; + static inline void chacha_init_consts(u32 *state) { - state[0] = 0x61707865; /* "expa" */ - state[1] = 0x3320646e; /* "nd 3" */ - state[2] = 0x79622d32; /* "2-by" */ - state[3] = 0x6b206574; /* "te k" */ + state[0] = CHACHA_CONSTANT_EXPA; + state[1] = CHACHA_CONSTANT_ND_3; + state[2] = CHACHA_CONSTANT_2_BY; + state[3] = CHACHA_CONSTANT_TE_K; } void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv); |