linux-kernel - [PATCH 22/26] nfc: s3fwrn5: Use SHA-1 library instead of crypto

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Message-ID: <20250712232329.818226-23-ebiggers@kernel.org>
Date: Sat, 12 Jul 2025 16:23:13 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: linux-crypto@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Ard Biesheuvel <ardb@...nel.org>,
	"Jason A . Donenfeld" <Jason@...c4.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mips@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org,
	sparclinux@...r.kernel.org,
	x86@...nel.org,
	Eric Biggers <ebiggers@...nel.org>
Subject: [PATCH 22/26] nfc: s3fwrn5: Use SHA-1 library instead of crypto_shash

Use the SHA-1 library instead of crypto_shash.  This is simpler and
faster.

Signed-off-by: Eric Biggers <ebiggers@...nel.org>
---
 drivers/nfc/s3fwrn5/Kconfig    |  3 +--
 drivers/nfc/s3fwrn5/firmware.c | 17 +----------------
 2 files changed, 2 insertions(+), 18 deletions(-)

diff --git a/drivers/nfc/s3fwrn5/Kconfig b/drivers/nfc/s3fwrn5/Kconfig
index 8a6b1a79de253..96386b73fa2b6 100644
--- a/drivers/nfc/s3fwrn5/Kconfig
+++ b/drivers/nfc/s3fwrn5/Kconfig
@@ -1,10 +1,9 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config NFC_S3FWRN5
 	tristate
-	select CRYPTO
-	select CRYPTO_HASH
+	select CRYPTO_LIB_SHA1
 	help
 	  Core driver for Samsung S3FWRN5 NFC chip. Contains core utilities
 	  of chip. It's intended to be used by PHYs to avoid duplicating lots
 	  of common code.
 
diff --git a/drivers/nfc/s3fwrn5/firmware.c b/drivers/nfc/s3fwrn5/firmware.c
index 781cdbcac104c..64d61b2a715ae 100644
--- a/drivers/nfc/s3fwrn5/firmware.c
+++ b/drivers/nfc/s3fwrn5/firmware.c
@@ -6,11 +6,10 @@
  * Robert Baldyga <r.baldyga@...sung.com>
  */
 
 #include <linux/completion.h>
 #include <linux/firmware.h>
-#include <crypto/hash.h>
 #include <crypto/sha1.h>
 
 #include "s3fwrn5.h"
 #include "firmware.h"
 
@@ -409,31 +408,17 @@ bool s3fwrn5_fw_check_version(const struct s3fwrn5_fw_info *fw_info, u32 version
 int s3fwrn5_fw_download(struct s3fwrn5_fw_info *fw_info)
 {
 	struct device *dev = &fw_info->ndev->nfc_dev->dev;
 	struct s3fwrn5_fw_image *fw = &fw_info->fw;
 	u8 hash_data[SHA1_DIGEST_SIZE];
-	struct crypto_shash *tfm;
 	u32 image_size, off;
 	int ret;
 
 	image_size = fw_info->sector_size * fw->image_sectors;
 
 	/* Compute SHA of firmware data */
-
-	tfm = crypto_alloc_shash("sha1", 0, 0);
-	if (IS_ERR(tfm)) {
-		dev_err(dev, "Cannot allocate shash (code=%pe)\n", tfm);
-		return PTR_ERR(tfm);
-	}
-
-	ret = crypto_shash_tfm_digest(tfm, fw->image, image_size, hash_data);
-
-	crypto_free_shash(tfm);
-	if (ret) {
-		dev_err(dev, "Cannot compute hash (code=%d)\n", ret);
-		return ret;
-	}
+	sha1(fw->image, image_size, hash_data);
 
 	/* Firmware update process */
 
 	dev_info(dev, "Firmware update: %s\n", fw_info->fw_name);
 
-- 
2.50.1