path: root/crypto/aegis128-neon.c
diff options
authorArd Biesheuvel <>2020-11-17 14:32:13 +0100
committerHerbert Xu <>2020-11-27 17:13:40 +1100
commit97b70180b7f97224762b63f211305a8052d07960 (patch)
treeaebcfef38a6a111998052fe206bbf288202c8b8b /crypto/aegis128-neon.c
parentad00d41b47e6c86f4da61b9812b81cd4cd74be64 (diff)
crypto: aegis128/neon - move final tag check to SIMD domain
Instead of calculating the tag and returning it to the caller on decryption, use a SIMD compare and min across vector to perform the comparison. This is slightly more efficient, and removes the need on the caller's part to wipe the tag from memory if the decryption failed. While at it, switch to unsigned int when passing cryptlen and assoclen - we don't support input sizes where it matters anyway. Signed-off-by: Ard Biesheuvel <> Reviewed-by: Ondrej Mosnacek <> Signed-off-by: Herbert Xu <>
Diffstat (limited to 'crypto/aegis128-neon.c')
1 files changed, 15 insertions, 6 deletions
diff --git a/crypto/aegis128-neon.c b/crypto/aegis128-neon.c
index 8271b1fa0fbc..94d591a002a4 100644
--- a/crypto/aegis128-neon.c
+++ b/crypto/aegis128-neon.c
@@ -14,8 +14,10 @@ void crypto_aegis128_encrypt_chunk_neon(void *state, void *dst, const void *src,
unsigned int size);
void crypto_aegis128_decrypt_chunk_neon(void *state, void *dst, const void *src,
unsigned int size);
-void crypto_aegis128_final_neon(void *state, void *tag_xor, uint64_t assoclen,
- uint64_t cryptlen);
+int crypto_aegis128_final_neon(void *state, void *tag_xor,
+ unsigned int assoclen,
+ unsigned int cryptlen,
+ unsigned int authsize);
int aegis128_have_aes_insn __ro_after_init;
@@ -60,11 +62,18 @@ void crypto_aegis128_decrypt_chunk_simd(union aegis_block *state, u8 *dst,
-void crypto_aegis128_final_simd(union aegis_block *state,
- union aegis_block *tag_xor,
- u64 assoclen, u64 cryptlen)
+int crypto_aegis128_final_simd(union aegis_block *state,
+ union aegis_block *tag_xor,
+ unsigned int assoclen,
+ unsigned int cryptlen,
+ unsigned int authsize)
+ int ret;
- crypto_aegis128_final_neon(state, tag_xor, assoclen, cryptlen);
+ ret = crypto_aegis128_final_neon(state, tag_xor, assoclen, cryptlen,
+ authsize);
+ return ret;