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rtl8188eu/core/rtw_security.c
Larry Finger 77d786b6e8 rtl8188eu: Copy the code from the kernel into a new branch 
This version takes advantage of all the cleanups to the code. It has
been modified to build on older kernels.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
2022-06-08 18:46:35 -05:00

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// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2007 - 2011 Realtek Corporation. */
#define _RTW_SECURITY_C_
#include "../include/osdep_service.h"
#include "../include/drv_types.h"
#include "../include/wifi.h"
#include "../include/osdep_intf.h"
/* WEP related ===== */
/*
Need to consider the fragment situation
*/
void rtw_wep_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
{ /* exclude ICV */
union {
__le32 f0;
u8 f1[4];
} crc;
int curfragnum, length;
u32 keylength;
u8 *pframe, *payload, *iv; /* wepkey */
u8 wepkey[16];
u8 hw_hdr_offset = 0;
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;
hw_hdr_offset = TXDESC_SIZE + pxmitframe->pkt_offset * PACKET_OFFSET_SZ;
pframe = pxmitframe->buf_addr + hw_hdr_offset;
/* start to encrypt each fragment */
if ((pattrib->encrypt == _WEP40_) || (pattrib->encrypt == _WEP104_)) {
keylength = psecuritypriv->dot11DefKeylen[psecuritypriv->dot11PrivacyKeyIndex];
for (curfragnum = 0; curfragnum < pattrib->nr_frags; curfragnum++) {
iv = pframe + pattrib->hdrlen;
memcpy(&wepkey[0], iv, 3);
memcpy(&wepkey[3], &psecuritypriv->dot11DefKey[psecuritypriv->dot11PrivacyKeyIndex].skey[0], keylength);
payload = pframe + pattrib->iv_len + pattrib->hdrlen;
if ((curfragnum + 1) == pattrib->nr_frags) { /* the last fragment */
length = pattrib->last_txcmdsz - pattrib->hdrlen - pattrib->iv_len - pattrib->icv_len;
crc.f0 = cpu_to_le32(~crc32_le(~0, payload, length));
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));
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));
}
}
}
}
void rtw_wep_decrypt(struct adapter *padapter, struct recv_frame *precvframe)
{
/* exclude ICV */
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;
/* start to decrypt recvframe */
if ((prxattrib->encrypt == _WEP40_) || (prxattrib->encrypt == _WEP104_)) {
iv = pframe + prxattrib->hdrlen;
keyindex = prxattrib->key_index;
keylength = psecuritypriv->dot11DefKeylen[keyindex];
memcpy(&wepkey[0], iv, 3);
memcpy(&wepkey[3], &psecuritypriv->dot11DefKey[keyindex].skey[0], keylength);
length = precvframe->len - prxattrib->hdrlen - prxattrib->iv_len;
payload = pframe + prxattrib->iv_len + prxattrib->hdrlen;
/* decrypt payload include icv */
arc4_setkey(ctx, wepkey, 3 + keylength);
arc4_crypt(ctx, payload, payload, length);
}
}
/* 3 ===== TKIP related ===== */
static u32 secmicgetuint32(u8 *p)
/* Convert from Byte[] to Us3232 in a portable way */
{
s32 i;
u32 res = 0;
for (i = 0; i < 4; i++)
res |= ((u32)(*p++)) << (8 * i);
return res;
}
static void secmicputuint32(u8 *p, u32 val)
/* Convert from Us3232 to Byte[] in a portable way */
{
long i;
for (i = 0; i < 4; i++) {
*p++ = (u8)(val & 0xff);
val >>= 8;
}
}
static void secmicclear(struct mic_data *pmicdata)
{
/* Reset the state to the empty message. */
pmicdata->L = pmicdata->K0;
pmicdata->R = pmicdata->K1;
pmicdata->nBytesInM = 0;
pmicdata->M = 0;
}
void rtw_secmicsetkey(struct mic_data *pmicdata, u8 *key)
{
/* Set the key */
pmicdata->K0 = secmicgetuint32(key);
pmicdata->K1 = secmicgetuint32(key + 4);
/* and reset the message */
secmicclear(pmicdata);
}
void rtw_secmicappendbyte(struct mic_data *pmicdata, u8 b)
{
/* Append the byte to our word-sized buffer */
pmicdata->M |= ((unsigned long)b) << (8 * pmicdata->nBytesInM);
pmicdata->nBytesInM++;
/* Process the word if it is full. */
if (pmicdata->nBytesInM >= 4) {
pmicdata->L ^= pmicdata->M;
pmicdata->R ^= ROL32(pmicdata->L, 17);
pmicdata->L += pmicdata->R;
pmicdata->R ^= ((pmicdata->L & 0xff00ff00) >> 8) | ((pmicdata->L & 0x00ff00ff) << 8);
pmicdata->L += pmicdata->R;
pmicdata->R ^= ROL32(pmicdata->L, 3);
pmicdata->L += pmicdata->R;
pmicdata->R ^= ROR32(pmicdata->L, 2);
pmicdata->L += pmicdata->R;
/* Clear the buffer */
pmicdata->M = 0;
pmicdata->nBytesInM = 0;
}
}
void rtw_secmicappend(struct mic_data *pmicdata, u8 *src, u32 nbytes)
{
/* This is simple */
while (nbytes > 0) {
rtw_secmicappendbyte(pmicdata, *src++);
nbytes--;
}
}
void rtw_secgetmic(struct mic_data *pmicdata, u8 *dst)
{
/* Append the minimum padding */
rtw_secmicappendbyte(pmicdata, 0x5a);
rtw_secmicappendbyte(pmicdata, 0);
rtw_secmicappendbyte(pmicdata, 0);
rtw_secmicappendbyte(pmicdata, 0);
rtw_secmicappendbyte(pmicdata, 0);
/* and then zeroes until the length is a multiple of 4 */
while (pmicdata->nBytesInM != 0)
rtw_secmicappendbyte(pmicdata, 0);
/* The appendByte function has already computed the result. */
secmicputuint32(dst, pmicdata->L);
secmicputuint32(dst + 4, pmicdata->R);
/* Reset to the empty message. */
secmicclear(pmicdata);
}
void rtw_seccalctkipmic(u8 *key, u8 *header, u8 *data, u32 data_len, u8 *mic_code, u8 pri)
{
struct mic_data micdata;
u8 priority[4] = {0x0, 0x0, 0x0, 0x0};
rtw_secmicsetkey(&micdata, key);
priority[0] = pri;
/* Michael MIC pseudo header: DA, SA, 3 x 0, Priority */
if (header[1] & 1) { /* ToDS == 1 */
rtw_secmicappend(&micdata, &header[16], 6); /* DA */
if (header[1] & 2) /* From Ds == 1 */
rtw_secmicappend(&micdata, &header[24], 6);
else
rtw_secmicappend(&micdata, &header[10], 6);
} else { /* ToDS == 0 */
rtw_secmicappend(&micdata, &header[4], 6); /* DA */
if (header[1] & 2) /* From Ds == 1 */
rtw_secmicappend(&micdata, &header[16], 6);
else
rtw_secmicappend(&micdata, &header[10], 6);
}
rtw_secmicappend(&micdata, &priority[0], 4);
rtw_secmicappend(&micdata, data, data_len);
rtw_secgetmic(&micdata, mic_code);
}
/* macros for extraction/creation of unsigned char/unsigned short values */
#define RotR1(v16) ((((v16) >> 1) & 0x7FFF) ^ (((v16) & 1) << 15))
#define Lo8(v16) ((u8)((v16) & 0x00FF))
#define Hi8(v16) ((u8)(((v16) >> 8) & 0x00FF))
#define Lo16(v32) ((u16)((v32) & 0xFFFF))
#define Hi16(v32) ((u16)(((v32) >> 16) & 0xFFFF))
#define Mk16(hi, lo) ((lo) ^ (((u16)(hi)) << 8))
/* select the Nth 16-bit word of the temporal key unsigned char array TK[] */
#define TK16(N) Mk16(tk[2 * (N) + 1], tk[2 * (N)])
/* S-box lookup: 16 bits --> 16 bits */
#define _S_(v16) (Sbox1[0][Lo8(v16)] ^ Sbox1[1][Hi8(v16)])
/* fixed algorithm "parameters" */
#define PHASE1_LOOP_CNT 8 /* this needs to be "big enough" */
#define TA_SIZE 6 /* 48-bit transmitter address */
#define TK_SIZE 16 /* 128-bit temporal key */
#define P1K_SIZE 10 /* 80-bit Phase1 key */
#define RC4_KEY_SIZE 16 /* 128-bit RC4KEY (104 bits unknown) */
/* 2-unsigned char by 2-unsigned char subset of the full AES S-box table */
static const unsigned short Sbox1[2][256] = { /* Sbox for hash (can be in ROM) */
{
0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154,
0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A,
0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B,
0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B,
0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F,
0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F,
0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5,
0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F,
0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB,
0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397,
0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED,
0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A,
0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194,
0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3,
0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104,
0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D,
0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39,
0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695,
0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83,
0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76,
0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4,
0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B,
0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0,
0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018,
0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751,
0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85,
0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12,
0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9,
0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7,
0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A,
0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8,
0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A,
},
{ /* second half of table is unsigned char-reversed version of first! */
0xA5C6, 0x84F8, 0x99EE, 0x8DF6, 0x0DFF, 0xBDD6, 0xB1DE, 0x5491,
0x5060, 0x0302, 0xA9CE, 0x7D56, 0x19E7, 0x62B5, 0xE64D, 0x9AEC,
0x458F, 0x9D1F, 0x4089, 0x87FA, 0x15EF, 0xEBB2, 0xC98E, 0x0BFB,
0xEC41, 0x67B3, 0xFD5F, 0xEA45, 0xBF23, 0xF753, 0x96E4, 0x5B9B,
0xC275, 0x1CE1, 0xAE3D, 0x6A4C, 0x5A6C, 0x417E, 0x02F5, 0x4F83,
0x5C68, 0xF451, 0x34D1, 0x08F9, 0x93E2, 0x73AB, 0x5362, 0x3F2A,
0x0C08, 0x5295, 0x6546, 0x5E9D, 0x2830, 0xA137, 0x0F0A, 0xB52F,
0x090E, 0x3624, 0x9B1B, 0x3DDF, 0x26CD, 0x694E, 0xCD7F, 0x9FEA,
0x1B12, 0x9E1D, 0x7458, 0x2E34, 0x2D36, 0xB2DC, 0xEEB4, 0xFB5B,
0xF6A4, 0x4D76, 0x61B7, 0xCE7D, 0x7B52, 0x3EDD, 0x715E, 0x9713,
0xF5A6, 0x68B9, 0x0000, 0x2CC1, 0x6040, 0x1FE3, 0xC879, 0xEDB6,
0xBED4, 0x468D, 0xD967, 0x4B72, 0xDE94, 0xD498, 0xE8B0, 0x4A85,
0x6BBB, 0x2AC5, 0xE54F, 0x16ED, 0xC586, 0xD79A, 0x5566, 0x9411,
0xCF8A, 0x10E9, 0x0604, 0x81FE, 0xF0A0, 0x4478, 0xBA25, 0xE34B,
0xF3A2, 0xFE5D, 0xC080, 0x8A05, 0xAD3F, 0xBC21, 0x4870, 0x04F1,
0xDF63, 0xC177, 0x75AF, 0x6342, 0x3020, 0x1AE5, 0x0EFD, 0x6DBF,
0x4C81, 0x1418, 0x3526, 0x2FC3, 0xE1BE, 0xA235, 0xCC88, 0x392E,
0x5793, 0xF255, 0x82FC, 0x477A, 0xACC8, 0xE7BA, 0x2B32, 0x95E6,
0xA0C0, 0x9819, 0xD19E, 0x7FA3, 0x6644, 0x7E54, 0xAB3B, 0x830B,
0xCA8C, 0x29C7, 0xD36B, 0x3C28, 0x79A7, 0xE2BC, 0x1D16, 0x76AD,
0x3BDB, 0x5664, 0x4E74, 0x1E14, 0xDB92, 0x0A0C, 0x6C48, 0xE4B8,
0x5D9F, 0x6EBD, 0xEF43, 0xA6C4, 0xA839, 0xA431, 0x37D3, 0x8BF2,
0x32D5, 0x438B, 0x596E, 0xB7DA, 0x8C01, 0x64B1, 0xD29C, 0xE049,
0xB4D8, 0xFAAC, 0x07F3, 0x25CF, 0xAFCA, 0x8EF4, 0xE947, 0x1810,
0xD56F, 0x88F0, 0x6F4A, 0x725C, 0x2438, 0xF157, 0xC773, 0x5197,
0x23CB, 0x7CA1, 0x9CE8, 0x213E, 0xDD96, 0xDC61, 0x860D, 0x850F,
0x90E0, 0x427C, 0xC471, 0xAACC, 0xD890, 0x0506, 0x01F7, 0x121C,
0xA3C2, 0x5F6A, 0xF9AE, 0xD069, 0x9117, 0x5899, 0x273A, 0xB927,
0x38D9, 0x13EB, 0xB32B, 0x3322, 0xBBD2, 0x70A9, 0x8907, 0xA733,
0xB62D, 0x223C, 0x9215, 0x20C9, 0x4987, 0xFFAA, 0x7850, 0x7AA5,
0x8F03, 0xF859, 0x8009, 0x171A, 0xDA65, 0x31D7, 0xC684, 0xB8D0,
0xC382, 0xB029, 0x775A, 0x111E, 0xCB7B, 0xFCA8, 0xD66D, 0x3A2C,
}
};
/*
**********************************************************************
* Routine: Phase 1 -- generate P1K, given TA, TK, IV32
*
* Inputs:
* tk[] = temporal key [128 bits]
* ta[] = transmitter's MAC address [ 48 bits]
* iv32 = upper 32 bits of IV [ 32 bits]
* Output:
* p1k[] = Phase 1 key [ 80 bits]
*
* Note:
* This function only needs to be called every 2**16 packets,
* although in theory it could be called every packet.
*
**********************************************************************
*/
static void phase1(u16 *p1k, const u8 *tk, const u8 *ta, u32 iv32)
{
int i;
/* Initialize the 80 bits of P1K[] from IV32 and TA[0..5] */
p1k[0] = Lo16(iv32);
p1k[1] = Hi16(iv32);
p1k[2] = Mk16(ta[1], ta[0]); /* use TA[] as little-endian */
p1k[3] = Mk16(ta[3], ta[2]);
p1k[4] = Mk16(ta[5], ta[4]);
/* Now compute an unbalanced Feistel cipher with 80-bit block */
/* size on the 80-bit block P1K[], using the 128-bit key TK[] */
for (i = 0; i < PHASE1_LOOP_CNT; i++) { /* Each add operation here is mod 2**16 */
p1k[0] += _S_(p1k[4] ^ TK16((i & 1) + 0));
p1k[1] += _S_(p1k[0] ^ TK16((i & 1) + 2));
p1k[2] += _S_(p1k[1] ^ TK16((i & 1) + 4));
p1k[3] += _S_(p1k[2] ^ TK16((i & 1) + 6));
p1k[4] += _S_(p1k[3] ^ TK16((i & 1) + 0));
p1k[4] += (unsigned short)i; /* avoid "slide attacks" */
}
}
/*
**********************************************************************
* Routine: Phase 2 -- generate RC4KEY, given TK, P1K, IV16
*
* Inputs:
* tk[] = Temporal key [128 bits]
* p1k[] = Phase 1 output key [ 80 bits]
* iv16 = low 16 bits of IV counter [ 16 bits]
* Output:
* rc4key[] = the key used to encrypt the packet [128 bits]
*
* Note:
* The value {TA, IV32, IV16} for Phase1/Phase2 must be unique
* across all packets using the same key TK value. Then, for a
* given value of TK[], this TKIP48 construction guarantees that
* the final RC4KEY value is unique across all packets.
*
* Suggested implementation optimization: if PPK[] is "overlaid"
* appropriately on RC4KEY[], there is no need for the final
* for loop below that copies the PPK[] result into RC4KEY[].
*
**********************************************************************
*/
static void phase2(u8 *rc4key, const u8 *tk, const u16 *p1k, u16 iv16)
{
int i;
u16 PPK[6]; /* temporary key for mixing */
/* Note: all adds in the PPK[] equations below are mod 2**16 */
for (i = 0; i < 5; i++)
PPK[i] = p1k[i]; /* first, copy P1K to PPK */
PPK[5] = p1k[4] + iv16; /* next, add in IV16 */
/* Bijective non-linear mixing of the 96 bits of PPK[0..5] */
PPK[0] += _S_(PPK[5] ^ TK16(0)); /* Mix key in each "round" */
PPK[1] += _S_(PPK[0] ^ TK16(1));
PPK[2] += _S_(PPK[1] ^ TK16(2));
PPK[3] += _S_(PPK[2] ^ TK16(3));
PPK[4] += _S_(PPK[3] ^ TK16(4));
PPK[5] += _S_(PPK[4] ^ TK16(5)); /* Total # S-box lookups == 6 */
/* Final sweep: bijective, "linear". Rotates kill LSB correlations */
PPK[0] += RotR1(PPK[5] ^ TK16(6));
PPK[1] += RotR1(PPK[0] ^ TK16(7)); /* Use all of TK[] in Phase2 */
PPK[2] += RotR1(PPK[1]);
PPK[3] += RotR1(PPK[2]);
PPK[4] += RotR1(PPK[3]);
PPK[5] += RotR1(PPK[4]);
/* Note: At this point, for a given key TK[0..15], the 96-bit output */
/* value PPK[0..5] is guaranteed to be unique, as a function */
/* of the 96-bit "input" value {TA, IV32, IV16}. That is, P1K */
/* is now a keyed permutation of {TA, IV32, IV16}. */
/* Set RC4KEY[0..3], which includes "cleartext" portion of RC4 key */
rc4key[0] = Hi8(iv16); /* RC4KEY[0..2] is the WEP IV */
rc4key[1] = (Hi8(iv16) | 0x20) & 0x7F; /* Help avoid weak (FMS) keys */
rc4key[2] = Lo8(iv16);
rc4key[3] = Lo8((PPK[5] ^ TK16(0)) >> 1);
/* Copy 96 bits of PPK[0..5] to RC4KEY[4..15] (little-endian) */
for (i = 0; i < 6; i++) {
rc4key[4 + 2 * i] = Lo8(PPK[i]);
rc4key[5 + 2 * i] = Hi8(PPK[i]);
}
}
/* The hlen isn't include the IV */
u32 rtw_tkip_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
{ /* exclude ICV */
u16 pnl;
u32 pnh;
u8 rc4key[16];
u8 ttkey[16];
union {
__le32 f0;
u8 f1[4];
} crc;
u8 hw_hdr_offset = 0;
int curfragnum, length;
u8 *pframe, *payload, *iv, *prwskey;
union pn48 dot11txpn;
struct sta_info *stainfo;
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)
return _FAIL;
hw_hdr_offset = TXDESC_SIZE + pxmitframe->pkt_offset * PACKET_OFFSET_SZ;
pframe = pxmitframe->buf_addr + hw_hdr_offset;
/* 4 start to encrypt each fragment */
if (pattrib->encrypt == _TKIP_) {
if (pattrib->psta)
stainfo = pattrib->psta;
else
stainfo = rtw_get_stainfo(&padapter->stapriv, &pattrib->ra[0]);
if (stainfo) {
if (is_multicast_ether_addr(pattrib->ra))
prwskey = psecuritypriv->dot118021XGrpKey[psecuritypriv->dot118021XGrpKeyid].skey;
else
prwskey = &stainfo->dot118021x_UncstKey.skey[0];
for (curfragnum = 0; curfragnum < pattrib->nr_frags; curfragnum++) {
iv = pframe + pattrib->hdrlen;
payload = pframe + pattrib->iv_len + pattrib->hdrlen;
GET_TKIP_PN(iv, dot11txpn);
pnl = (u16)(dot11txpn.val);
pnh = (u32)(dot11txpn.val >> 16);
phase1((u16 *)&ttkey[0], prwskey, &pattrib->ta[0], pnh);
phase2(&rc4key[0], prwskey, (u16 *)&ttkey[0], pnl);
if ((curfragnum + 1) == pattrib->nr_frags) { /* 4 the last fragment */
length = pattrib->last_txcmdsz - pattrib->hdrlen - pattrib->iv_len - pattrib->icv_len;
crc.f0 = cpu_to_le32(~crc32_le(~0, payload, length));
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));
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));
}
}
} else {
res = _FAIL;
}
}
return res;
}
/* The hlen isn't include the IV */
u32 rtw_tkip_decrypt(struct adapter *padapter, struct recv_frame *precvframe)
{ /* exclude ICV */
u16 pnl;
u32 pnh;
u8 rc4key[16];
u8 ttkey[16];
union {
__le32 f0;
u8 f1[4];
} crc;
int length;
u8 *pframe, *payload, *iv, *prwskey;
union pn48 dot11txpn;
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;
/* 4 start to decrypt recvframe */
if (prxattrib->encrypt == _TKIP_) {
stainfo = rtw_get_stainfo(&padapter->stapriv, &prxattrib->ta[0]);
if (stainfo) {
if (is_multicast_ether_addr(prxattrib->ra)) {
if (!psecuritypriv->binstallGrpkey) {
res = _FAIL;
goto exit;
}
prwskey = psecuritypriv->dot118021XGrpKey[prxattrib->key_index].skey;
} else {
prwskey = &stainfo->dot118021x_UncstKey.skey[0];
}
iv = pframe + prxattrib->hdrlen;
payload = pframe + prxattrib->iv_len + prxattrib->hdrlen;
length = precvframe->len - prxattrib->hdrlen - prxattrib->iv_len;
GET_TKIP_PN(iv, dot11txpn);
pnl = (u16)(dot11txpn.val);
pnh = (u32)(dot11txpn.val >> 16);
phase1((u16 *)&ttkey[0], prwskey, &prxattrib->ta[0], pnh);
phase2(&rc4key[0], prwskey, (unsigned short *)&ttkey[0], pnl);
/* 4 decrypt payload include icv */
arc4_setkey(ctx, rc4key, 16);
arc4_crypt(ctx, payload, payload, length);
crc.f0 = cpu_to_le32(~crc32_le(~0, payload, length));
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])
res = _FAIL;
} else {
res = _FAIL;
}
}
exit:
return res;
}
/* 3 ===== AES related ===== */
#define MAX_MSG_SIZE 2048
/*****************************/
/******** SBOX Table *********/
/*****************************/
static u8 sbox_table[256] = {
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc,
0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a,
0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b,
0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17,
0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9,
0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6,
0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94,
0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68,
0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
};
/*****************************/
/**** Function Prototypes ****/
/*****************************/
static void bitwise_xor(u8 *ina, u8 *inb, u8 *out);
static void construct_mic_iv(u8 *mic_header1, int qc_exists, int a4_exists, u8 *mpdu, uint payload_length, u8 *pn_vector);
static void construct_mic_header1(u8 *mic_header1, int header_length, u8 *mpdu);
static void construct_mic_header2(u8 *mic_header2, u8 *mpdu, int a4_exists, int qc_exists);
static void construct_ctr_preload(u8 *ctr_preload, int a4_exists, int qc_exists, u8 *mpdu, u8 *pn_vector, int c);
static void xor_128(u8 *a, u8 *b, u8 *out);
static void xor_32(u8 *a, u8 *b, u8 *out);
static u8 sbox(u8 a);
static void next_key(u8 *key, int round);
static void byte_sub(u8 *in, u8 *out);
static void shift_row(u8 *in, u8 *out);
static void mix_column(u8 *in, u8 *out);
static void aes128k128d(u8 *key, u8 *data, u8 *ciphertext);
/****************************************/
/* aes128k128d() */
/* Performs a 128 bit AES encrypt with */
/* 128 bit data. */
/****************************************/
static void xor_128(u8 *a, u8 *b, u8 *out)
{
int i;
for (i = 0; i < 16; i++)
out[i] = a[i] ^ b[i];
}
static void xor_32(u8 *a, u8 *b, u8 *out)
{
int i;
for (i = 0; i < 4; i++)
out[i] = a[i] ^ b[i];
}
static u8 sbox(u8 a)
{
return sbox_table[(int)a];
}
static void next_key(u8 *key, int round)
{
u8 rcon;
u8 sbox_key[4];
u8 rcon_table[12] = {
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80,
0x1b, 0x36, 0x36, 0x36
};
sbox_key[0] = sbox(key[13]);
sbox_key[1] = sbox(key[14]);
sbox_key[2] = sbox(key[15]);
sbox_key[3] = sbox(key[12]);
rcon = rcon_table[round];
xor_32(&key[0], sbox_key, &key[0]);
key[0] = key[0] ^ rcon;
xor_32(&key[4], &key[0], &key[4]);
xor_32(&key[8], &key[4], &key[8]);
xor_32(&key[12], &key[8], &key[12]);
}
static void byte_sub(u8 *in, u8 *out)
{
int i;
for (i = 0; i < 16; i++)
out[i] = sbox(in[i]);
}
static void shift_row(u8 *in, u8 *out)
{
out[0] = in[0];
out[1] = in[5];
out[2] = in[10];
out[3] = in[15];
out[4] = in[4];
out[5] = in[9];
out[6] = in[14];
out[7] = in[3];
out[8] = in[8];
out[9] = in[13];
out[10] = in[2];
out[11] = in[7];
out[12] = in[12];
out[13] = in[1];
out[14] = in[6];
out[15] = in[11];
}
static void mix_column(u8 *in, u8 *out)
{
int i;
u8 add1b[4];
u8 add1bf7[4];
u8 rotl[4];
u8 swap_halfs[4];
u8 andf7[4];
u8 rotr[4];
u8 temp[4];
u8 tempb[4];
for (i = 0 ; i < 4; i++) {
if ((in[i] & 0x80) == 0x80)
add1b[i] = 0x1b;
else
add1b[i] = 0x00;
}
swap_halfs[0] = in[2]; /* Swap halves */
swap_halfs[1] = in[3];
swap_halfs[2] = in[0];
swap_halfs[3] = in[1];
rotl[0] = in[3]; /* Rotate left 8 bits */
rotl[1] = in[0];
rotl[2] = in[1];
rotl[3] = in[2];
andf7[0] = in[0] & 0x7f;
andf7[1] = in[1] & 0x7f;
andf7[2] = in[2] & 0x7f;
andf7[3] = in[3] & 0x7f;
for (i = 3; i > 0; i--) { /* logical shift left 1 bit */
andf7[i] = andf7[i] << 1;
if ((andf7[i - 1] & 0x80) == 0x80)
andf7[i] = (andf7[i] | 0x01);
}
andf7[0] = andf7[0] << 1;
andf7[0] = andf7[0] & 0xfe;
xor_32(add1b, andf7, add1bf7);
xor_32(in, add1bf7, rotr);
temp[0] = rotr[0]; /* Rotate right 8 bits */
rotr[0] = rotr[1];
rotr[1] = rotr[2];
rotr[2] = rotr[3];
rotr[3] = temp[0];
xor_32(add1bf7, rotr, temp);
xor_32(swap_halfs, rotl, tempb);
xor_32(temp, tempb, out);
}
static void aes128k128d(u8 *key, u8 *data, u8 *ciphertext)
{
int round;
int i;
u8 intermediatea[16];
u8 intermediateb[16];
u8 round_key[16];
for (i = 0; i < 16; i++)
round_key[i] = key[i];
for (round = 0; round < 11; round++) {
if (round == 0) {
xor_128(round_key, data, ciphertext);
next_key(round_key, round);
} else if (round == 10) {
byte_sub(ciphertext, intermediatea);
shift_row(intermediatea, intermediateb);
xor_128(intermediateb, round_key, ciphertext);
} else { /* 1 - 9 */
byte_sub(ciphertext, intermediatea);
shift_row(intermediatea, intermediateb);
mix_column(&intermediateb[0], &intermediatea[0]);
mix_column(&intermediateb[4], &intermediatea[4]);
mix_column(&intermediateb[8], &intermediatea[8]);
mix_column(&intermediateb[12], &intermediatea[12]);
xor_128(intermediatea, round_key, ciphertext);
next_key(round_key, round);
}
}
}
/************************************************/
/* construct_mic_iv() */
/* Builds the MIC IV from header fields and PN */
/************************************************/
static void construct_mic_iv(u8 *mic_iv, int qc_exists, int a4_exists, u8 *mpdu,
uint payload_length, u8 *pn_vector)
{
int i;
mic_iv[0] = 0x59;
if (qc_exists && a4_exists)
mic_iv[1] = mpdu[30] & 0x0f; /* QoS_TC */
if (qc_exists && !a4_exists)
mic_iv[1] = mpdu[24] & 0x0f; /* mute bits 7-4 */
if (!qc_exists)
mic_iv[1] = 0x00;
for (i = 2; i < 8; i++)
mic_iv[i] = mpdu[i + 8]; /* mic_iv[2:7] = A2[0:5] = mpdu[10:15] */
for (i = 8; i < 14; i++)
mic_iv[i] = pn_vector[13 - i]; /* mic_iv[8:13] = PN[5:0] */
mic_iv[14] = (unsigned char)(payload_length / 256);
mic_iv[15] = (unsigned char)(payload_length % 256);
}
/************************************************/
/* construct_mic_header1() */
/* Builds the first MIC header block from */
/* header fields. */
/************************************************/
static void construct_mic_header1(u8 *mic_header1, int header_length, u8 *mpdu)
{
mic_header1[0] = (u8)((header_length - 2) / 256);
mic_header1[1] = (u8)((header_length - 2) % 256);
mic_header1[2] = mpdu[0] & 0xcf; /* Mute CF poll & CF ack bits */
mic_header1[3] = mpdu[1] & 0xc7; /* Mute retry, more data and pwr mgt bits */
mic_header1[4] = mpdu[4]; /* A1 */
mic_header1[5] = mpdu[5];
mic_header1[6] = mpdu[6];
mic_header1[7] = mpdu[7];
mic_header1[8] = mpdu[8];
mic_header1[9] = mpdu[9];
mic_header1[10] = mpdu[10]; /* A2 */
mic_header1[11] = mpdu[11];
mic_header1[12] = mpdu[12];
mic_header1[13] = mpdu[13];
mic_header1[14] = mpdu[14];
mic_header1[15] = mpdu[15];
}
/************************************************/
/* construct_mic_header2() */
/* Builds the last MIC header block from */
/* header fields. */
/************************************************/
static void construct_mic_header2(u8 *mic_header2, u8 *mpdu, int a4_exists, int qc_exists)
{
int i;
for (i = 0; i < 16; i++)
mic_header2[i] = 0x00;
mic_header2[0] = mpdu[16]; /* A3 */
mic_header2[1] = mpdu[17];
mic_header2[2] = mpdu[18];
mic_header2[3] = mpdu[19];
mic_header2[4] = mpdu[20];
mic_header2[5] = mpdu[21];
mic_header2[6] = 0x00;
mic_header2[7] = 0x00; /* mpdu[23]; */
if (!qc_exists && a4_exists) {
for (i = 0; i < 6; i++)
mic_header2[8 + i] = mpdu[24 + i]; /* A4 */
}
if (qc_exists && !a4_exists) {
mic_header2[8] = mpdu[24] & 0x0f; /* mute bits 15 - 4 */
mic_header2[9] = mpdu[25] & 0x00;
}
if (qc_exists && a4_exists) {
for (i = 0; i < 6; i++)
mic_header2[8 + i] = mpdu[24 + i]; /* A4 */
mic_header2[14] = mpdu[30] & 0x0f;
mic_header2[15] = mpdu[31] & 0x00;
}
}
/************************************************/
/* construct_mic_header2() */
/* Builds the last MIC header block from */
/* header fields. */
/************************************************/
static void construct_ctr_preload(u8 *ctr_preload, int a4_exists, int qc_exists, u8 *mpdu, u8 *pn_vector, int c)
{
int i;
for (i = 0; i < 16; i++)
ctr_preload[i] = 0x00;
i = 0;
ctr_preload[0] = 0x01; /* flag */
if (qc_exists && a4_exists)
ctr_preload[1] = mpdu[30] & 0x0f; /* QoC_Control */
if (qc_exists && !a4_exists)
ctr_preload[1] = mpdu[24] & 0x0f;
for (i = 2; i < 8; i++)
ctr_preload[i] = mpdu[i + 8]; /* ctr_preload[2:7] = A2[0:5] = mpdu[10:15] */
for (i = 8; i < 14; i++)
ctr_preload[i] = pn_vector[13 - i]; /* ctr_preload[8:13] = PN[5:0] */
ctr_preload[14] = (unsigned char)(c / 256); /* Ctr */
ctr_preload[15] = (unsigned char)(c % 256);
}
/************************************/
/* bitwise_xor() */
/* A 128 bit, bitwise exclusive or */
/************************************/
static void bitwise_xor(u8 *ina, u8 *inb, u8 *out)
{
int i;
for (i = 0; i < 16; i++)
out[i] = ina[i] ^ inb[i];
}
static int aes_cipher(u8 *key, uint hdrlen, u8 *pframe, uint plen)
{
uint qc_exists, a4_exists, i, j, payload_remainder,
num_blocks, payload_index;
u8 pn_vector[6];
u8 mic_iv[16];
u8 mic_header1[16];
u8 mic_header2[16];
u8 ctr_preload[16];
/* Intermediate Buffers */
u8 chain_buffer[16];
u8 aes_out[16];
u8 padded_buffer[16];
u8 mic[8];
uint frtype = GetFrameType(pframe);
uint frsubtype = GetFrameSubType(pframe);
frsubtype = frsubtype >> 4;
memset((void *)mic_iv, 0, 16);
memset((void *)mic_header1, 0, 16);
memset((void *)mic_header2, 0, 16);
memset((void *)ctr_preload, 0, 16);
memset((void *)chain_buffer, 0, 16);
memset((void *)aes_out, 0, 16);
memset((void *)padded_buffer, 0, 16);
if ((hdrlen == WLAN_HDR_A3_LEN) || (hdrlen == WLAN_HDR_A3_QOS_LEN))
a4_exists = 0;
else
a4_exists = 1;
if ((frtype == WIFI_DATA_CFACK) || (frtype == WIFI_DATA_CFPOLL) || (frtype == WIFI_DATA_CFACKPOLL)) {
qc_exists = 1;
if (hdrlen != WLAN_HDR_A3_QOS_LEN)
hdrlen += 2;
} else if ((frsubtype == 0x08) || (frsubtype == 0x09) || (frsubtype == 0x0a) || (frsubtype == 0x0b)) {
if (hdrlen != WLAN_HDR_A3_QOS_LEN)
hdrlen += 2;
qc_exists = 1;
} else {
qc_exists = 0;
}
pn_vector[0] = pframe[hdrlen];
pn_vector[1] = pframe[hdrlen + 1];
pn_vector[2] = pframe[hdrlen + 4];
pn_vector[3] = pframe[hdrlen + 5];
pn_vector[4] = pframe[hdrlen + 6];
pn_vector[5] = pframe[hdrlen + 7];
construct_mic_iv(mic_iv, qc_exists, a4_exists, pframe, plen, pn_vector);
construct_mic_header1(mic_header1, hdrlen, pframe);
construct_mic_header2(mic_header2, pframe, a4_exists, qc_exists);
payload_remainder = plen % 16;
num_blocks = plen / 16;
/* Find start of payload */
payload_index = (hdrlen + 8);
/* Calculate MIC */
aes128k128d(key, mic_iv, aes_out);
bitwise_xor(aes_out, mic_header1, chain_buffer);
aes128k128d(key, chain_buffer, aes_out);
bitwise_xor(aes_out, mic_header2, chain_buffer);
aes128k128d(key, chain_buffer, aes_out);
for (i = 0; i < num_blocks; i++) {
bitwise_xor(aes_out, &pframe[payload_index], chain_buffer);/* bitwise_xor(aes_out, &message[payload_index], chain_buffer); */
payload_index += 16;
aes128k128d(key, chain_buffer, aes_out);
}
/* Add on the final payload block if it needs padding */
if (payload_remainder > 0) {
for (j = 0; j < 16; j++)
padded_buffer[j] = 0x00;
for (j = 0; j < payload_remainder; j++)
padded_buffer[j] = pframe[payload_index++];/* padded_buffer[j] = message[payload_index++]; */
bitwise_xor(aes_out, padded_buffer, chain_buffer);
aes128k128d(key, chain_buffer, aes_out);
}
for (j = 0; j < 8; j++)
mic[j] = aes_out[j];
/* Insert MIC into payload */
for (j = 0; j < 8; j++)
pframe[payload_index + j] = mic[j]; /* message[payload_index+j] = mic[j]; */
payload_index = hdrlen + 8;
for (i = 0; i < num_blocks; i++) {
construct_ctr_preload(ctr_preload, a4_exists, qc_exists, pframe, pn_vector, i + 1);
aes128k128d(key, ctr_preload, aes_out);
bitwise_xor(aes_out, &pframe[payload_index], chain_buffer);
for (j = 0; j < 16; j++)
pframe[payload_index++] = chain_buffer[j];
}
if (payload_remainder > 0) { /* If there is a short final block, then pad it,*/
/* encrypt it and copy the unpadded part back */
construct_ctr_preload(ctr_preload, a4_exists, qc_exists, pframe, pn_vector, num_blocks + 1);
for (j = 0; j < 16; j++)
padded_buffer[j] = 0x00;
for (j = 0; j < payload_remainder; j++)
padded_buffer[j] = pframe[payload_index + j];
aes128k128d(key, ctr_preload, aes_out);
bitwise_xor(aes_out, padded_buffer, chain_buffer);
for (j = 0; j < payload_remainder; j++)
pframe[payload_index++] = chain_buffer[j];
}
/* Encrypt the MIC */
construct_ctr_preload(ctr_preload, a4_exists, qc_exists, pframe, pn_vector, 0);
for (j = 0; j < 16; j++)
padded_buffer[j] = 0x00;
for (j = 0; j < 8; j++)
padded_buffer[j] = pframe[j + hdrlen + 8 + plen];
aes128k128d(key, ctr_preload, aes_out);
bitwise_xor(aes_out, padded_buffer, chain_buffer);
for (j = 0; j < 8; j++)
pframe[payload_index++] = chain_buffer[j];
return _SUCCESS;
}
u32 rtw_aes_encrypt(struct adapter *padapter, struct xmit_frame *pxmitframe)
{ /* exclude ICV */
/*static*/
/* unsigned char message[MAX_MSG_SIZE]; */
/* Intermediate Buffers */
int curfragnum, length;
u8 *pframe, *prwskey; /* *payload,*iv */
u8 hw_hdr_offset = 0;
struct sta_info *stainfo;
struct pkt_attrib *pattrib = &pxmitframe->attrib;
struct security_priv *psecuritypriv = &padapter->securitypriv;
struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
/* uint offset = 0; */
u32 res = _SUCCESS;
if (!pxmitframe->buf_addr)
return _FAIL;
hw_hdr_offset = TXDESC_SIZE + pxmitframe->pkt_offset * PACKET_OFFSET_SZ;
pframe = pxmitframe->buf_addr + hw_hdr_offset;
/* 4 start to encrypt each fragment */
if (pattrib->encrypt == _AES_) {
if (pattrib->psta)
stainfo = pattrib->psta;
else
stainfo = rtw_get_stainfo(&padapter->stapriv, &pattrib->ra[0]);
if (stainfo) {
if (is_multicast_ether_addr(pattrib->ra))
prwskey = psecuritypriv->dot118021XGrpKey[psecuritypriv->dot118021XGrpKeyid].skey;
else
prwskey = &stainfo->dot118021x_UncstKey.skey[0];
for (curfragnum = 0; curfragnum < pattrib->nr_frags; curfragnum++) {
if ((curfragnum + 1) == pattrib->nr_frags) { /* 4 the last fragment */
length = pattrib->last_txcmdsz - pattrib->hdrlen - pattrib->iv_len - pattrib->icv_len;
aes_cipher(prwskey, pattrib->hdrlen, pframe, length);
} else {
length = pxmitpriv->frag_len - pattrib->hdrlen - pattrib->iv_len - pattrib->icv_len;
aes_cipher(prwskey, pattrib->hdrlen, pframe, length);
pframe += pxmitpriv->frag_len;
pframe = (u8 *)RND4((size_t)(pframe));
}
}
} else {
res = _FAIL;
}
}
return res;
}
static int aes_decipher(u8 *key, uint hdrlen,
u8 *pframe, uint plen)
{
static u8 message[MAX_MSG_SIZE];
uint qc_exists, a4_exists, i, j, payload_remainder,
num_blocks, payload_index;
int res = _SUCCESS;
u8 pn_vector[6];
u8 mic_iv[16];
u8 mic_header1[16];
u8 mic_header2[16];
u8 ctr_preload[16];
/* Intermediate Buffers */
u8 chain_buffer[16];
u8 aes_out[16];
u8 padded_buffer[16];
u8 mic[8];
/* uint offset = 0; */
uint frtype = GetFrameType(pframe);
uint frsubtype = GetFrameSubType(pframe);
frsubtype = frsubtype >> 4;
memset((void *)mic_iv, 0, 16);
memset((void *)mic_header1, 0, 16);
memset((void *)mic_header2, 0, 16);
memset((void *)ctr_preload, 0, 16);
memset((void *)chain_buffer, 0, 16);
memset((void *)aes_out, 0, 16);
memset((void *)padded_buffer, 0, 16);
/* start to decrypt the payload */
num_blocks = (plen - 8) / 16; /* plen including llc, payload_length and mic) */
payload_remainder = (plen - 8) % 16;
pn_vector[0] = pframe[hdrlen];
pn_vector[1] = pframe[hdrlen + 1];
pn_vector[2] = pframe[hdrlen + 4];
pn_vector[3] = pframe[hdrlen + 5];
pn_vector[4] = pframe[hdrlen + 6];
pn_vector[5] = pframe[hdrlen + 7];
if ((hdrlen == WLAN_HDR_A3_LEN) || (hdrlen == WLAN_HDR_A3_QOS_LEN))
a4_exists = 0;
else
a4_exists = 1;
if ((frtype == WIFI_DATA_CFACK) || (frtype == WIFI_DATA_CFPOLL) ||
(frtype == WIFI_DATA_CFACKPOLL)) {
qc_exists = 1;
if (hdrlen != WLAN_HDR_A3_QOS_LEN)
hdrlen += 2;
} else if ((frsubtype == 0x08) || (frsubtype == 0x09) ||
(frsubtype == 0x0a) || (frsubtype == 0x0b)) {
if (hdrlen != WLAN_HDR_A3_QOS_LEN)
hdrlen += 2;
qc_exists = 1;
} else {
qc_exists = 0;
}
/* now, decrypt pframe with hdrlen offset and plen long */
payload_index = hdrlen + 8; /* 8 is for extiv */
for (i = 0; i < num_blocks; i++) {
construct_ctr_preload(ctr_preload, a4_exists, qc_exists, pframe, pn_vector, i + 1);
aes128k128d(key, ctr_preload, aes_out);
bitwise_xor(aes_out, &pframe[payload_index], chain_buffer);
for (j = 0; j < 16; j++)
pframe[payload_index++] = chain_buffer[j];
}
if (payload_remainder > 0) { /* If there is a short final block, then pad it,*/
/* encrypt it and copy the unpadded part back */
construct_ctr_preload(ctr_preload, a4_exists, qc_exists, pframe, pn_vector, num_blocks + 1);
for (j = 0; j < 16; j++)
padded_buffer[j] = 0x00;
for (j = 0; j < payload_remainder; j++)
padded_buffer[j] = pframe[payload_index + j];
aes128k128d(key, ctr_preload, aes_out);
bitwise_xor(aes_out, padded_buffer, chain_buffer);
for (j = 0; j < payload_remainder; j++)
pframe[payload_index++] = chain_buffer[j];
}
/* start to calculate the mic */
if ((hdrlen + plen + 8) <= MAX_MSG_SIZE)
memcpy(message, pframe, (hdrlen + plen + 8)); /* 8 is for ext iv len */
pn_vector[0] = pframe[hdrlen];
pn_vector[1] = pframe[hdrlen + 1];
pn_vector[2] = pframe[hdrlen + 4];
pn_vector[3] = pframe[hdrlen + 5];
pn_vector[4] = pframe[hdrlen + 6];
pn_vector[5] = pframe[hdrlen + 7];
construct_mic_iv(mic_iv, qc_exists, a4_exists, message, plen - 8, pn_vector);
construct_mic_header1(mic_header1, hdrlen, message);
construct_mic_header2(mic_header2, message, a4_exists, qc_exists);
payload_remainder = (plen - 8) % 16;
num_blocks = (plen - 8) / 16;
/* Find start of payload */
payload_index = (hdrlen + 8);
/* Calculate MIC */
aes128k128d(key, mic_iv, aes_out);
bitwise_xor(aes_out, mic_header1, chain_buffer);
aes128k128d(key, chain_buffer, aes_out);
bitwise_xor(aes_out, mic_header2, chain_buffer);
aes128k128d(key, chain_buffer, aes_out);
for (i = 0; i < num_blocks; i++) {
bitwise_xor(aes_out, &message[payload_index], chain_buffer);
payload_index += 16;
aes128k128d(key, chain_buffer, aes_out);
}
/* Add on the final payload block if it needs padding */
if (payload_remainder > 0) {
for (j = 0; j < 16; j++)
padded_buffer[j] = 0x00;
for (j = 0; j < payload_remainder; j++)
padded_buffer[j] = message[payload_index++];
bitwise_xor(aes_out, padded_buffer, chain_buffer);
aes128k128d(key, chain_buffer, aes_out);
}
for (j = 0 ; j < 8; j++)
mic[j] = aes_out[j];
/* Insert MIC into payload */
for (j = 0; j < 8; j++)
message[payload_index + j] = mic[j];
payload_index = hdrlen + 8;
for (i = 0; i < num_blocks; i++) {
construct_ctr_preload(ctr_preload, a4_exists, qc_exists, message, pn_vector, i + 1);
aes128k128d(key, ctr_preload, aes_out);
bitwise_xor(aes_out, &message[payload_index], chain_buffer);
for (j = 0; j < 16; j++)
message[payload_index++] = chain_buffer[j];
}
if (payload_remainder > 0) { /* If there is a short final block, then pad it,*/
/* encrypt it and copy the unpadded part back */
construct_ctr_preload(ctr_preload, a4_exists, qc_exists, message, pn_vector, num_blocks + 1);
for (j = 0; j < 16; j++)
padded_buffer[j] = 0x00;
for (j = 0; j < payload_remainder; j++)
padded_buffer[j] = message[payload_index + j];
aes128k128d(key, ctr_preload, aes_out);
bitwise_xor(aes_out, padded_buffer, chain_buffer);
for (j = 0; j < payload_remainder; j++)
message[payload_index++] = chain_buffer[j];
}
/* Encrypt the MIC */
construct_ctr_preload(ctr_preload, a4_exists, qc_exists, message, pn_vector, 0);
for (j = 0; j < 16; j++)
padded_buffer[j] = 0x00;
for (j = 0; j < 8; j++)
padded_buffer[j] = message[j + hdrlen + 8 + plen - 8];
aes128k128d(key, ctr_preload, aes_out);
bitwise_xor(aes_out, padded_buffer, chain_buffer);
for (j = 0; j < 8; j++)
message[payload_index++] = chain_buffer[j];
/* compare the mic */
for (i = 0; i < 8; i++) {
if (pframe[hdrlen + 8 + plen - 8 + i] != message[hdrlen + 8 + plen - 8 + i])
res = _FAIL;
}
return res;
}
u32 rtw_aes_decrypt(struct adapter *padapter, struct recv_frame *precvframe)
{ /* exclude ICV */
/* Intermediate Buffers */
int length;
u8 *pframe, *prwskey; /* *payload,*iv */
struct sta_info *stainfo;
struct rx_pkt_attrib *prxattrib = &precvframe->attrib;
struct security_priv *psecuritypriv = &padapter->securitypriv;
u32 res = _SUCCESS;
pframe = precvframe->rx_data;
/* 4 start to encrypt each fragment */
if (prxattrib->encrypt == _AES_) {
stainfo = rtw_get_stainfo(&padapter->stapriv, &prxattrib->ta[0]);
if (stainfo) {
if (is_multicast_ether_addr(prxattrib->ra)) {
/* in concurrent we should use sw descrypt in group key, so we remove this message */
if (!psecuritypriv->binstallGrpkey) {
res = _FAIL;
goto exit;
}
prwskey = psecuritypriv->dot118021XGrpKey[prxattrib->key_index].skey;
if (psecuritypriv->dot118021XGrpKeyid != prxattrib->key_index) {
res = _FAIL;
goto exit;
}
} else {
prwskey = &stainfo->dot118021x_UncstKey.skey[0];
}
length = precvframe->len - prxattrib->hdrlen - prxattrib->iv_len;
res = aes_decipher(prwskey, prxattrib->hdrlen, pframe, length);
} else {
res = _FAIL;
}
}
exit:
return res;
}
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