linux-kernel - [PATCH v3 1/2] staging: rtl8188eu: Replace a custom function with crc32

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Message-Id: <20210721110052.26376-2-fmdefrancesco@gmail.com>
Date:   Wed, 21 Jul 2021 13:00:51 +0200
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Cc:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Subject: [PATCH v3 1/2] staging: rtl8188eu: Replace a custom function with crc32_le()

Use crc32_le() in place of the custom getcrc32().

Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
---

v2 --> v3:
Join two related patches in a series because they must be applied in 
order (first 1/2, then 2/2). Rebase to the current Greg K-H's tree and resend.

v1 --> v2:
Use cpu_to_le32() to assign native endian return value of crc32_le to
crc in little endian byte order.

 drivers/staging/rtl8188eu/core/rtw_security.c | 23 ++++---------------
 1 file changed, 5 insertions(+), 18 deletions(-)

diff --git a/drivers/staging/rtl8188eu/core/rtw_security.c b/drivers/staging/rtl8188eu/core/rtw_security.c
index 1b2cb6196463..e9de61afe881 100644
--- a/drivers/staging/rtl8188eu/core/rtw_security.c
+++ b/drivers/staging/rtl8188eu/core/rtw_security.c
@@ -11,6 +11,7 @@
 #include <wifi.h>
 #include <osdep_intf.h>
 #include <net/lib80211.h>
+#include <linux/types.h>
 
 /* WEP related ===== */
 
@@ -111,21 +112,6 @@ static void crc32_init(void)
 	bcrc32initialized = 1;
 }
 
-static __le32 getcrc32(u8 *buf, int len)
-{
-	u8 *p;
-	u32  crc;
-
-	if (bcrc32initialized == 0)
-		crc32_init();
-
-	crc = 0xffffffff;       /* preload shift register, per CRC-32 spec */
-
-	for (p = buf; len > 0; ++p, --len)
-		crc = crc32_table[(crc ^ *p) & 0xff] ^ (crc >> 8);
-	return cpu_to_le32(~crc);    /* transmit complement, per CRC-32 spec */
-}
-
 /* Need to consider the fragment  situation */
 void rtw_wep_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
 {
@@ -609,14 +595,15 @@ u32	rtw_tkip_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
 
 				if ((curfragnum + 1) == pattrib->nr_frags) {	/* 4 the last fragment */
 					length = pattrib->last_txcmdsz - pattrib->hdrlen - pattrib->iv_len - pattrib->icv_len;
-					*((__le32 *)crc) = getcrc32(payload, length);/* modified by Amy*/
+					*((__le32 *)crc) = cpu_to_le32(~crc32_le(~0, payload, length));
 
 					arcfour_init(&mycontext, rc4key, 16);
 					arcfour_encrypt(&mycontext, payload, payload, length);
 					arcfour_encrypt(&mycontext, payload + length, crc, 4);
 				} else {
 					length = pxmitpriv->frag_len - pattrib->hdrlen - pattrib->iv_len - pattrib->icv_len;
-					*((__le32 *)crc) = getcrc32(payload, length);/* modified by Amy*/
+					*((__le32 *)crc) = cpu_to_le32(~crc32_le(~0, payload, length));
+
 					arcfour_init(&mycontext, rc4key, 16);
 					arcfour_encrypt(&mycontext, payload, payload, length);
 					arcfour_encrypt(&mycontext, payload + length, crc, 4);
@@ -682,7 +669,7 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, struct recv_frame *precvframe)
 			arcfour_init(&mycontext, rc4key, 16);
 			arcfour_encrypt(&mycontext, payload, payload, length);
 
-			*((__le32 *)crc) = getcrc32(payload, length - 4);
+			*((__le32 *)crc) = cpu_to_le32(~crc32_le(~0, payload, length - 4));
 
 			if (crc[3] != payload[length - 1] ||
 			    crc[2] != payload[length - 2] ||
-- 
2.32.0