From fe603e6ba49f1d0ca4f27ac5039806c4f7b53779 Mon Sep 17 00:00:00 2001
From: Hanno Becker <beckphan@amazon.co.uk>
Date: Thu, 12 Dec 2024 13:08:59 +0000
Subject: [PATCH] FIPS202: Remove redundant zeroization in
 shake128_absorb_once()

`shake128_absorb_once()` calls `keccak_absorb_once()`, which already
includes zeroization of the state. The zeroization can therefore be
dropped from `shake128_absorb_once()`.

Signed-off-by: Hanno Becker <beckphan@amazon.co.uk>
---
 fips202/fips202.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/fips202/fips202.c b/fips202/fips202.c
index 0080d236a..39832829d 100644
--- a/fips202/fips202.c
+++ b/fips202/fips202.c
@@ -133,11 +133,6 @@ static void keccak_squeeze_once(uint8_t *h, size_t outlen, uint64_t *s,
 void shake128_absorb_once(shake128ctx *state, const uint8_t *input,
                           size_t inlen)
 {
-  int i;
-  for (i = 0; i < 25; i++)
-  {
-    state->ctx[i] = 0;
-  }
   keccak_absorb_once(state->ctx, SHAKE128_RATE, input, inlen, 0x1F);
 }