linux-kernel - [PATCH 1/2] crypto: stm32/hash: Fix hmac issue more than 256 bytes

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Date:   Fri, 28 Jun 2019 13:26:54 +0200
From:   Lionel Debieve <lionel.debieve@...com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "Alexandre Torgue" <alexandre.torgue@...com>,
        <linux-crypto@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     Benjamin Gaignard <benjamin.gaignard@...com>,
        Fabien Dessenne <fabien.dessenne@...com>,
        Ludovic Barre <ludovic.barre@...com>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: [PATCH 1/2] crypto: stm32/hash: Fix hmac issue more than 256 bytes

Correct condition for the second hmac loop. Key must be only
set in the first loop. Initial condition was wrong,
HMAC_KEY flag was not properly checked.

Signed-off-by: Lionel Debieve <lionel.debieve@...com>
---
 drivers/crypto/stm32/stm32-hash.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/stm32/stm32-hash.c b/drivers/crypto/stm32/stm32-hash.c
index 29519d1c403f..c37d1a336f98 100644
--- a/drivers/crypto/stm32/stm32-hash.c
+++ b/drivers/crypto/stm32/stm32-hash.c
@@ -349,7 +349,7 @@ static int stm32_hash_xmit_cpu(struct stm32_hash_dev *hdev,
 		return -ETIMEDOUT;
 
 	if ((hdev->flags & HASH_FLAGS_HMAC) &&
-	    (hdev->flags & ~HASH_FLAGS_HMAC_KEY)) {
+	    (!(hdev->flags & HASH_FLAGS_HMAC_KEY))) {
 		hdev->flags |= HASH_FLAGS_HMAC_KEY;
 		stm32_hash_write_key(hdev);
 		if (stm32_hash_wait_busy(hdev))
-- 
2.17.1