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authorEric Biggers <ebiggers@google.com>2020-12-23 00:09:53 -0800
committerHerbert Xu <herbert@gondor.apana.org.au>2021-01-03 08:41:38 +1100
commit057edc9c8bb2d5ff5b058b521792c392428a0714 (patch)
treec9eef3ec1b8c2291af5b0ed0dec286a6efac251c /include
parentdf412e7efda1e2c5b5fcb06701bba77434cbd1e8 (diff)
downloadlinux-057edc9c8bb2d5ff5b058b521792c392428a0714.tar.bz2
crypto: blake2s - move update and final logic to internal/blake2s.h
Move most of blake2s_update() and blake2s_final() into new inline functions __blake2s_update() and __blake2s_final() in include/crypto/internal/blake2s.h so that this logic can be shared by the shash helper functions. This will avoid duplicating this logic between the library and shash implementations. 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>
Diffstat (limited to 'include')
-rw-r--r--include/crypto/internal/blake2s.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/include/crypto/internal/blake2s.h b/include/crypto/internal/blake2s.h
index 6e376ae6b6b5..42deba4b8cee 100644
--- a/include/crypto/internal/blake2s.h
+++ b/include/crypto/internal/blake2s.h
@@ -4,6 +4,7 @@
#define BLAKE2S_INTERNAL_H
#include <crypto/blake2s.h>
+#include <linux/string.h>
struct blake2s_tfm_ctx {
u8 key[BLAKE2S_KEY_SIZE];
@@ -23,4 +24,44 @@ static inline void blake2s_set_lastblock(struct blake2s_state *state)
state->f[0] = -1;
}
+typedef void (*blake2s_compress_t)(struct blake2s_state *state,
+ const u8 *block, size_t nblocks, u32 inc);
+
+static inline void __blake2s_update(struct blake2s_state *state,
+ const u8 *in, size_t inlen,
+ blake2s_compress_t compress)
+{
+ const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
+
+ if (unlikely(!inlen))
+ return;
+ if (inlen > fill) {
+ memcpy(state->buf + state->buflen, in, fill);
+ (*compress)(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
+ state->buflen = 0;
+ in += fill;
+ inlen -= fill;
+ }
+ if (inlen > BLAKE2S_BLOCK_SIZE) {
+ const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
+ /* Hash one less (full) block than strictly possible */
+ (*compress)(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
+ in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
+ inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
+ }
+ memcpy(state->buf + state->buflen, in, inlen);
+ state->buflen += inlen;
+}
+
+static inline void __blake2s_final(struct blake2s_state *state, u8 *out,
+ blake2s_compress_t compress)
+{
+ blake2s_set_lastblock(state);
+ memset(state->buf + state->buflen, 0,
+ BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
+ (*compress)(state, state->buf, 1, state->buflen);
+ cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
+ memcpy(out, state->h, state->outlen);
+}
+
#endif /* BLAKE2S_INTERNAL_H */