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staging: r8188eu: use in-kernel arc4 encryption

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Replace custom arc4 implementation with in-kernel one.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210903190444.15585-3-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Straube
2021-09-03 21:04:43 +02:00
committed by Greg Kroah-Hartman
parent c96bb23d71
commit 24e11a227d
2 changed files with 25 additions and 82 deletions
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102
drivers/staging/r8188eu/core/rtw_security.c
View File

@@ -10,68 +10,6 @@
/* WEP related ===== */
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);
}
/*
Need to consider the fragment situation
*/
@@ -81,7 +19,6 @@ void rtw_wep_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
__le32 f0;
u8 f1[4];
} crc;
struct arc4context mycontext;
int curfragnum, length;
u32 keylength;
@@ -92,6 +29,7 @@ void rtw_wep_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
struct pkt_attrib *pattrib = &pxmitframe->attrib;
struct security_priv *psecuritypriv = &padapter->securitypriv;
struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
struct arc4_ctx *ctx = &psecuritypriv->xmit_arc4_ctx;
if (!pxmitframe->buf_addr)
return;
@@ -114,15 +52,15 @@ void rtw_wep_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
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.f1, 4);
arc4_setkey(ctx, wepkey, 3 + keylength);
arc4_crypt(ctx, payload, payload, length);
arc4_crypt(ctx, payload + length, crc.f1, 4);
} else {
length = pxmitpriv->frag_len - pattrib->hdrlen - pattrib->iv_len - pattrib->icv_len;
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.f1, 4);
arc4_setkey(ctx, wepkey, 3 + keylength);
arc4_crypt(ctx, payload, payload, length);
arc4_crypt(ctx, payload + length, crc.f1, 4);
pframe += pxmitpriv->frag_len;
pframe = (u8 *)RND4((size_t)(pframe));
@@ -135,13 +73,13 @@ void rtw_wep_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
void rtw_wep_decrypt(struct adapter *padapter, struct recv_frame *precvframe)
{
/* exclude ICV */
struct arc4context mycontext;
int length;
u32 keylength;
u8 *pframe, *payload, *iv, wepkey[16];
u8 keyindex;
struct rx_pkt_attrib *prxattrib = &precvframe->attrib;
struct security_priv *psecuritypriv = &padapter->securitypriv;
struct arc4_ctx *ctx = &psecuritypriv->recv_arc4_ctx;
pframe = precvframe->rx_data;
@@ -157,8 +95,8 @@ void rtw_wep_decrypt(struct adapter *padapter, struct recv_frame *precvframe)
payload = pframe + prxattrib->iv_len + prxattrib->hdrlen;
/* decrypt payload include icv */
arcfour_init(&mycontext, wepkey, 3 + keylength);
arcfour_encrypt(&mycontext, payload, payload, length);
arc4_setkey(ctx, wepkey, 3 + keylength);
arc4_crypt(ctx, payload, payload, length);
}
}
@@ -509,7 +447,6 @@ u32 rtw_tkip_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
u8 f1[4];
} crc;
u8 hw_hdr_offset = 0;
struct arc4context mycontext;
int curfragnum, length;
u8 *pframe, *payload, *iv, *prwskey;
@@ -518,6 +455,7 @@ u32 rtw_tkip_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
struct pkt_attrib *pattrib = &pxmitframe->attrib;
struct security_priv *psecuritypriv = &padapter->securitypriv;
struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
struct arc4_ctx *ctx = &psecuritypriv->xmit_arc4_ctx;
u32 res = _SUCCESS;
if (!pxmitframe->buf_addr)
@@ -554,16 +492,16 @@ u32 rtw_tkip_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
length = pattrib->last_txcmdsz - pattrib->hdrlen - pattrib->iv_len - pattrib->icv_len;
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.f1, 4);
arc4_setkey(ctx, rc4key, 16);
arc4_crypt(ctx, payload, payload, length);
arc4_crypt(ctx, payload + length, crc.f1, 4);
} else {
length = pxmitpriv->frag_len - pattrib->hdrlen - pattrib->iv_len - pattrib->icv_len;
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.f1, 4);
arc4_setkey(ctx, rc4key, 16);
arc4_crypt(ctx, payload, payload, length);
arc4_crypt(ctx, payload + length, crc.f1, 4);
pframe += pxmitpriv->frag_len;
pframe = (u8 *)RND4((size_t)(pframe));
@@ -588,7 +526,6 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, struct recv_frame *precvframe)
__le32 f0;
u8 f1[4];
} crc;
struct arc4context mycontext;
int length;
u8 *pframe, *payload, *iv, *prwskey;
@@ -596,6 +533,7 @@ u32 rtw_tkip_decrypt(struct adapter *padapter, struct recv_frame *precvframe)
struct sta_info *stainfo;
struct rx_pkt_attrib *prxattrib = &precvframe->attrib;
struct security_priv *psecuritypriv = &padapter->securitypriv;
struct arc4_ctx *ctx = &psecuritypriv->recv_arc4_ctx;
u32 res = _SUCCESS;
pframe = precvframe->rx_data;
@@ -629,8 +567,8 @@ 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(ctx, rc4key, 16);
arc4_crypt(ctx, payload, payload, length);
crc.f0 = cpu_to_le32(~crc32_le(~0, payload, length));

5
drivers/staging/r8188eu/include/rtw_security.h
View File

@@ -6,6 +6,7 @@
#include "osdep_service.h"
#include "drv_types.h"
#include <crypto/arc4.h>
#define _NO_PRIVACY_ 0x0
#define _WEP40_ 0x1
@@ -106,6 +107,10 @@ struct security_priv {
union Keytype dot118021XGrprxmickey[4];
union pn48 dot11Grptxpn; /* PN48 used for Grp Key xmit.*/
union pn48 dot11Grprxpn; /* PN48 used for Grp Key recv.*/
struct arc4_ctx xmit_arc4_ctx;
struct arc4_ctx recv_arc4_ctx;
#ifdef CONFIG_88EU_AP_MODE
/* extend security capabilities for AP_MODE */
unsigned int dot8021xalg;/* 0:disable, 1:psk, 2:802.1x */