From: Eric Biggers ebiggers@google.com
stable inclusion from stable-v5.10.119 commit d45ae768b71b96869643fcea7c2d629120d01ba2 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6BB
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 42ad8cf821f0d8564c393e9ad7d00a1a271d18ae upstream.
If no key was provided, then don't waste time initializing the block buffer, as its initial contents won't be used.
Also, make crypto_blake2s_init() and blake2s() call a single internal function __blake2s_init() which treats the key as optional, rather than conditionally calling blake2s_init() or blake2s_init_key(). This reduces the compiled code size, as previously both blake2s_init() and blake2s_init_key() were being inlined into these two callers, except when the key size passed to blake2s() was a compile-time constant.
These optimizations aren't that significant for BLAKE2s. However, the equivalent optimizations will be more significant for BLAKE2b, as everything is twice as big in BLAKE2b. And it's good to keep things consistent rather than making optimizations for BLAKE2b but not BLAKE2s.
Signed-off-by: Eric Biggers ebiggers@google.com Acked-by: Ard Biesheuvel ardb@kernel.org Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Jason A. Donenfeld Jason@zx2c4.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Acked-by: Xie XiuQi xiexiuqi@huawei.com --- include/crypto/blake2s.h | 53 ++++++++++++++++--------------- include/crypto/internal/blake2s.h | 5 +-- 2 files changed, 28 insertions(+), 30 deletions(-)
diff --git a/include/crypto/blake2s.h b/include/crypto/blake2s.h index b471deac28ff..734ed22b7a6a 100644 --- a/include/crypto/blake2s.h +++ b/include/crypto/blake2s.h @@ -43,29 +43,34 @@ enum blake2s_iv { BLAKE2S_IV7 = 0x5BE0CD19UL, };
-void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen); -void blake2s_final(struct blake2s_state *state, u8 *out); - -static inline void blake2s_init_param(struct blake2s_state *state, - const u32 param) +static inline void __blake2s_init(struct blake2s_state *state, size_t outlen, + const void *key, size_t keylen) { - *state = (struct blake2s_state){{ - BLAKE2S_IV0 ^ param, - BLAKE2S_IV1, - BLAKE2S_IV2, - BLAKE2S_IV3, - BLAKE2S_IV4, - BLAKE2S_IV5, - BLAKE2S_IV6, - BLAKE2S_IV7, - }}; + state->h[0] = BLAKE2S_IV0 ^ (0x01010000 | keylen << 8 | outlen); + state->h[1] = BLAKE2S_IV1; + state->h[2] = BLAKE2S_IV2; + state->h[3] = BLAKE2S_IV3; + state->h[4] = BLAKE2S_IV4; + state->h[5] = BLAKE2S_IV5; + state->h[6] = BLAKE2S_IV6; + state->h[7] = BLAKE2S_IV7; + state->t[0] = 0; + state->t[1] = 0; + state->f[0] = 0; + state->f[1] = 0; + state->buflen = 0; + state->outlen = outlen; + if (keylen) { + memcpy(state->buf, key, keylen); + memset(&state->buf[keylen], 0, BLAKE2S_BLOCK_SIZE - keylen); + state->buflen = BLAKE2S_BLOCK_SIZE; + } }
static inline void blake2s_init(struct blake2s_state *state, const size_t outlen) { - blake2s_init_param(state, 0x01010000 | outlen); - state->outlen = outlen; + __blake2s_init(state, outlen, NULL, 0); }
static inline void blake2s_init_key(struct blake2s_state *state, @@ -75,12 +80,12 @@ static inline void blake2s_init_key(struct blake2s_state *state, WARN_ON(IS_ENABLED(DEBUG) && (!outlen || outlen > BLAKE2S_HASH_SIZE || !key || !keylen || keylen > BLAKE2S_KEY_SIZE));
- blake2s_init_param(state, 0x01010000 | keylen << 8 | outlen); - memcpy(state->buf, key, keylen); - state->buflen = BLAKE2S_BLOCK_SIZE; - state->outlen = outlen; + __blake2s_init(state, outlen, key, keylen); }
+void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen); +void blake2s_final(struct blake2s_state *state, u8 *out); + static inline void blake2s(u8 *out, const u8 *in, const u8 *key, const size_t outlen, const size_t inlen, const size_t keylen) @@ -91,11 +96,7 @@ static inline void blake2s(u8 *out, const u8 *in, const u8 *key, outlen > BLAKE2S_HASH_SIZE || keylen > BLAKE2S_KEY_SIZE || (!key && keylen)));
- if (keylen) - blake2s_init_key(&state, outlen, key, keylen); - else - blake2s_init(&state, outlen); - + __blake2s_init(&state, outlen, key, keylen); blake2s_update(&state, in, inlen); blake2s_final(&state, out); } diff --git a/include/crypto/internal/blake2s.h b/include/crypto/internal/blake2s.h index 2ea0a8f5e7f4..867ef3753f5c 100644 --- a/include/crypto/internal/blake2s.h +++ b/include/crypto/internal/blake2s.h @@ -93,10 +93,7 @@ static inline int crypto_blake2s_init(struct shash_desc *desc) struct blake2s_state *state = shash_desc_ctx(desc); unsigned int outlen = crypto_shash_digestsize(desc->tfm);
- if (tctx->keylen) - blake2s_init_key(state, outlen, tctx->key, tctx->keylen); - else - blake2s_init(state, outlen); + __blake2s_init(state, outlen, tctx->key, tctx->keylen); return 0; }