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Message-Id: <7e16c40d5baa007dca81a12b967a597ed00d8dd7.1618055514.git.christophe.jaillet@wanadoo.fr>
Date: Sat, 10 Apr 2021 13:55:43 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: gregkh@...uxfoundation.org
Cc: linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
kernel-janitors@...r.kernel.org,
Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH 1/3] staging: rtl8188eu: Use existing arc4 implementation
Use functions provided by <crypto/arc4.h> instead of hand writing them.
The implementations are slightly different, but are equivalent. It has
been checked with a test program which compares the output of the 2 sets of
functions.
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
drivers/staging/rtl8188eu/core/rtw_security.c | 80 +++----------------
1 file changed, 11 insertions(+), 69 deletions(-)
diff --git a/drivers/staging/rtl8188eu/core/rtw_security.c b/drivers/staging/rtl8188eu/core/rtw_security.c
index 617f89842c81..61e3eb0a4791 100644
--- a/drivers/staging/rtl8188eu/core/rtw_security.c
+++ b/drivers/staging/rtl8188eu/core/rtw_security.c
@@ -6,6 +6,7 @@
******************************************************************************/
#define _RTW_SECURITY_C_
+#include <crypto/arc4.h>
#include <osdep_service.h>
#include <drv_types.h>
#include <wifi.h>
@@ -16,65 +17,6 @@
#define CRC32_POLY 0x04c11db7
-struct arc4context {
- u32 x;
- u32 y;
- u8 state[256];
-};
-
-static void arcfour_init(struct arc4context *parc4ctx, u8 *key, u32 key_len)
-{
- u32 t, u;
- u32 keyindex;
- u32 stateindex;
- u8 *state;
- u32 counter;
-
- state = parc4ctx->state;
- parc4ctx->x = 0;
- parc4ctx->y = 0;
- for (counter = 0; counter < 256; counter++)
- state[counter] = (u8)counter;
- keyindex = 0;
- stateindex = 0;
- for (counter = 0; counter < 256; counter++) {
- t = state[counter];
- stateindex = (stateindex + key[keyindex] + t) & 0xff;
- u = state[stateindex];
- state[stateindex] = (u8)t;
- state[counter] = (u8)u;
- if (++keyindex >= key_len)
- keyindex = 0;
- }
-}
-
-static u32 arcfour_byte(struct arc4context *parc4ctx)
-{
- u32 x;
- u32 y;
- u32 sx, sy;
- u8 *state;
-
- state = parc4ctx->state;
- x = (parc4ctx->x + 1) & 0xff;
- sx = state[x];
- y = (sx + parc4ctx->y) & 0xff;
- sy = state[y];
- parc4ctx->x = x;
- parc4ctx->y = y;
- state[y] = (u8)sx;
- state[x] = (u8)sy;
- return state[(sx + sy) & 0xff];
-}
-
-static void arcfour_encrypt(struct arc4context *parc4ctx, u8 *dest, u8 *src, u32 len)
-{
- u32 i;
-
- for (i = 0; i < len; i++)
- dest[i] = src[i] ^ (unsigned char)arcfour_byte(parc4ctx);
-}
-
static int bcrc32initialized;
static u32 crc32_table[256];
@@ -564,7 +506,7 @@ u32 rtw_tkip_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
u8 ttkey[16];
u8 crc[4];
u8 hw_hdr_offset = 0;
- struct arc4context mycontext;
+ struct arc4_ctx mycontext;
int curfragnum, length;
u8 *pframe, *payload, *iv, *prwskey;
@@ -614,15 +556,15 @@ u32 rtw_tkip_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
pattrib->iv_len, pattrib->icv_len));
*((__le32 *)crc) = getcrc32(payload, length);/* modified by Amy*/
- arcfour_init(&mycontext, rc4key, 16);
- arcfour_encrypt(&mycontext, payload, payload, length);
- arcfour_encrypt(&mycontext, payload + length, crc, 4);
+ arc4_setkey(&mycontext, rc4key, 16);
+ arc4_crypt(&mycontext, payload, payload, length);
+ arc4_crypt(&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*/
- arcfour_init(&mycontext, rc4key, 16);
- arcfour_encrypt(&mycontext, payload, payload, length);
- arcfour_encrypt(&mycontext, payload + length, crc, 4);
+ arc4_setkey(&mycontext, rc4key, 16);
+ arc4_crypt(&mycontext, payload, payload, length);
+ arc4_crypt(&mycontext, payload + length, crc, 4);
pframe += pxmitpriv->frag_len;
pframe = (u8 *)round_up((size_t)(pframe), 4);
@@ -644,7 +586,7 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, struct recv_frame *precvframe)
u8 rc4key[16];
u8 ttkey[16];
u8 crc[4];
- struct arc4context mycontext;
+ struct arc4_ctx mycontext;
int length;
u8 *pframe, *payload, *iv, *prwskey;
union pn48 dot11txpn;
@@ -685,8 +627,8 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, struct recv_frame *precvframe)
/* 4 decrypt payload include icv */
- arcfour_init(&mycontext, rc4key, 16);
- arcfour_encrypt(&mycontext, payload, payload, length);
+ arc4_setkey(&mycontext, rc4key, 16);
+ arc4_crypt(&mycontext, payload, payload, length);
*((__le32 *)crc) = getcrc32(payload, length - 4);
--
2.27.0
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