All of lore.kernel.org
 help / color / mirror / Atom feed
From: "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Larry Finger <Larry.Finger@lwfinger.net>,
	linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org
Cc: "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
Subject: [PATCH 1/2] staging: r8188eu: Replace a custom function with crc32_le()
Date: Fri, 30 Jul 2021 12:37:15 +0200	[thread overview]
Message-ID: <20210730103716.27210-2-fmdefrancesco@gmail.com> (raw)
In-Reply-To: <20210730103716.27210-1-fmdefrancesco@gmail.com>

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

Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
---
 drivers/staging/r8188eu/core/rtw_security.c | 74 ++++++++++-----------
 1 file changed, 35 insertions(+), 39 deletions(-)

diff --git a/drivers/staging/r8188eu/core/rtw_security.c b/drivers/staging/r8188eu/core/rtw_security.c
index 5df970994e23..9625beea4b3c 100644
--- a/drivers/staging/r8188eu/core/rtw_security.c
+++ b/drivers/staging/r8188eu/core/rtw_security.c
@@ -111,29 +111,15 @@ static void crc32_init(void)
 	}
 }
 
-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, u8 *pxmitframe)
 {	/*  exclude ICV */
-
-	unsigned char	crc[4];
+	union {
+		__le32 f0;
+		u8 f1[4];
+	} crc;
 	struct arc4context	 mycontext;
 
 	int	curfragnum, length;
@@ -167,17 +153,17 @@ void rtw_wep_encrypt(struct adapter *padapter, u8 *pxmitframe)
 			if ((curfragnum+1) == pattrib->nr_frags) {	/* the last fragment */
 				length = pattrib->last_txcmdsz-pattrib->hdrlen-pattrib->iv_len-pattrib->icv_len;
 
-				*((__le32 *)crc) = getcrc32(payload, length);
+				crc.f0 = cpu_to_le32(~crc32_le(~0, payload, length));
 
 				arcfour_init(&mycontext, wepkey, 3+keylength);
 				arcfour_encrypt(&mycontext, payload, payload, length);
-				arcfour_encrypt(&mycontext, payload+length, crc, 4);
+				arcfour_encrypt(&mycontext, payload+length, crc.f1, 4);
 			} else {
 				length = pxmitpriv->frag_len-pattrib->hdrlen-pattrib->iv_len-pattrib->icv_len;
-				*((__le32 *)crc) = getcrc32(payload, length);
+				crc.f0 = cpu_to_le32(~crc32_le(~0, payload, length));
 				arcfour_init(&mycontext, wepkey, 3+keylength);
 				arcfour_encrypt(&mycontext, payload, payload, length);
-				arcfour_encrypt(&mycontext, payload+length, crc, 4);
+				arcfour_encrypt(&mycontext, payload+length, crc.f1, 4);
 
 				pframe += pxmitpriv->frag_len;
 				pframe = (u8 *)RND4((size_t)(pframe));
@@ -190,7 +176,10 @@ void rtw_wep_encrypt(struct adapter *padapter, u8 *pxmitframe)
 void rtw_wep_decrypt(struct adapter  *padapter, u8 *precvframe)
 {
 	/*  exclude ICV */
-	u8	crc[4];
+	union {
+		__le32 f0;
+		u8 f1[4];
+	} crc;
 	struct arc4context	 mycontext;
 	int	length;
 	u32	keylength;
@@ -217,12 +206,12 @@ void rtw_wep_decrypt(struct adapter  *padapter, u8 *precvframe)
 		arcfour_encrypt(&mycontext, payload, payload,  length);
 
 		/* calculate icv and compare the icv */
-		*((__le32 *)crc) = getcrc32(payload, length - 4);
+		crc.f0 = cpu_to_le32(~crc32_le(~0, payload, length));
 
-		if (crc[3] != payload[length-1] ||
-		    crc[2] != payload[length-2] ||
-		    crc[1] != payload[length-3] ||
-		    crc[0] != payload[length-4]) {
+		if (crc.f1[3] != payload[length-1] ||
+		    crc.f1[2] != payload[length-2] ||
+		    crc.f1[1] != payload[length-3] ||
+		    crc.f1[0] != payload[length-4]) {
 			RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
 				 ("rtw_wep_decrypt:icv error crc (%4ph)!=payload (%4ph)\n",
 				 &crc, &payload[length-4]));
@@ -574,7 +563,10 @@ u32	rtw_tkip_encrypt(struct adapter *padapter, u8 *pxmitframe)
 	u32	pnh;
 	u8	rc4key[16];
 	u8   ttkey[16];
-	u8	crc[4];
+	union {
+		__le32 f0;
+		u8 f1[4];
+	} crc;
 	u8   hw_hdr_offset = 0;
 	struct arc4context mycontext;
 	int			curfragnum, length;
@@ -624,17 +616,18 @@ u32	rtw_tkip_encrypt(struct adapter *padapter, u8 *pxmitframe)
 					RT_TRACE(_module_rtl871x_security_c_, _drv_info_,
 						 ("pattrib->iv_len=%x, pattrib->icv_len=%x\n",
 						 pattrib->iv_len, pattrib->icv_len));
-					*((__le32 *)crc) = getcrc32(payload, length);/* modified by Amy*/
+					crc.f0 = 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);
+					arcfour_encrypt(&mycontext, payload+length, crc.f1, 4);
 				} else {
 					length = pxmitpriv->frag_len-pattrib->hdrlen-pattrib->iv_len-pattrib->icv_len ;
-					*((__le32 *)crc) = getcrc32(payload, length);/* modified by Amy*/
+					crc.f0 = 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);
+					arcfour_encrypt(&mycontext, payload+length, crc.f1, 4);
 
 					pframe += pxmitpriv->frag_len;
 					pframe = (u8 *)RND4((size_t)(pframe));
@@ -656,7 +649,10 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, u8 *precvframe)
 	u32 pnh;
 	u8   rc4key[16];
 	u8   ttkey[16];
-	u8	crc[4];
+	union {
+		__le32 f0;
+		u8 f1[4];
+	} crc;
 	struct arc4context mycontext;
 	int			length;
 
@@ -702,12 +698,12 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, u8 *precvframe)
 			arcfour_init(&mycontext, rc4key, 16);
 			arcfour_encrypt(&mycontext, payload, payload, length);
 
-			*((__le32 *)crc) = getcrc32(payload, length-4);
+			crc.f0 = cpu_to_le32(~crc32_le(~0, payload, length));
 
-			if (crc[3] != payload[length-1] ||
-			    crc[2] != payload[length-2] ||
-			    crc[1] != payload[length-3] ||
-			    crc[0] != payload[length-4]) {
+			if (crc.f1[3] != payload[length-1] ||
+			    crc.f1[2] != payload[length-2] ||
+			    crc.f1[1] != payload[length-3] ||
+			    crc.f1[0] != payload[length-4]) {
 				RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
 					 ("rtw_wep_decrypt:icv error crc (%4ph)!=payload (%4ph)\n",
 					 &crc, &payload[length-4]));
-- 
2.32.0


  reply	other threads:[~2021-07-30 10:37 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30 10:37 [PATCH 0/2] staging: r8188eu: Use in-kernel API and remove no more needed symbols Fabio M. De Francesco
2021-07-30 10:37 ` Fabio M. De Francesco [this message]
2021-07-30 10:37 ` [PATCH 2/2] staging: r8188eu: Remove no more used functions and variables Fabio M. De Francesco
2021-07-30 18:51   ` Larry Finger

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210730103716.27210-2-fmdefrancesco@gmail.com \
    --to=fmdefrancesco@gmail.com \
    --cc=Larry.Finger@lwfinger.net \
    --cc=gregkh@linuxfoundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-staging@lists.linux.dev \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.