diff options
Diffstat (limited to 'drivers/staging/rtl8712/rtl871x_security.c')
| -rw-r--r-- | drivers/staging/rtl8712/rtl871x_security.c | 1389 |
1 files changed, 1389 insertions, 0 deletions
diff --git a/drivers/staging/rtl8712/rtl871x_security.c b/drivers/staging/rtl8712/rtl871x_security.c new file mode 100644 index 0000000..65321be --- /dev/null +++ b/drivers/staging/rtl8712/rtl871x_security.c @@ -0,0 +1,1389 @@ +/****************************************************************************** + * rtl871x_security.c + * + * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved. + * Linux device driver for RTL8192SU + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA + * + * Modifications for inclusion into the Linux staging tree are + * Copyright(c) 2010 Larry Finger. All rights reserved. + * + * Contact information: + * WLAN FAE <wlanfae@realtek.com> + * Larry Finger <Larry.Finger@lwfinger.net> + * + ******************************************************************************/ + +#define _RTL871X_SECURITY_C_ + +#include "osdep_service.h" +#include "drv_types.h" +#include "wifi.h" +#include "osdep_intf.h" + +/* =====WEP related===== */ + +#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 sint bcrc32initialized; +static u32 crc32_table[256]; + +static u8 crc32_reverseBit(u8 data) +{ + return ((u8)(data << 7) & 0x80) | ((data << 5) & 0x40) | ((data << 3) + & 0x20) | ((data << 1) & 0x10) | ((data >> 1) & 0x08) | + ((data >> 3) & 0x04) | ((data >> 5) & 0x02) | ((data >> 7) & + 0x01); +} + +static void crc32_init(void) +{ + if (bcrc32initialized == 1) + return; + else { + sint i, j; + u32 c; + u8 *p = (u8 *)&c, *p1; + u8 k; + + c = 0x12340000; + for (i = 0; i < 256; ++i) { + k = crc32_reverseBit((u8)i); + for (c = ((u32)k) << 24, j = 8; j > 0; --j) + c = c & 0x80000000 ? (c << 1) ^ CRC32_POLY : + (c << 1); + p1 = (u8 *)&crc32_table[i]; + p1[0] = crc32_reverseBit(p[3]); + p1[1] = crc32_reverseBit(p[2]); + p1[2] = crc32_reverseBit(p[1]); + p1[3] = crc32_reverseBit(p[0]); + } + bcrc32initialized = 1; + } +} + +static u32 getcrc32(u8 *buf, u32 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 ~crc; /* transmit complement, per CRC-32 spec */ +} + +/* + Need to consider the fragment situation +*/ +void r8712_wep_encrypt(struct _adapter *padapter, u8 *pxmitframe) +{ /* exclude ICV */ + unsigned char crc[4]; + struct arc4context mycontext; + u32 curfragnum, length, keylength; + u8 *pframe, *payload, *iv; /*,*wepkey*/ + u8 wepkey[16]; + struct pkt_attrib *pattrib = &((struct xmit_frame *) + pxmitframe)->attrib; + struct security_priv *psecuritypriv = &padapter->securitypriv; + struct xmit_priv *pxmitpriv = &padapter->xmitpriv; + + if (((struct xmit_frame *)pxmitframe)->buf_addr == NULL) + return; + pframe = ((struct xmit_frame *)pxmitframe)->buf_addr+TXDESC_OFFSET; + /*start to encrypt each fragment*/ + if ((pattrib->encrypt == _WEP40_) || (pattrib->encrypt == _WEP104_)) { + keylength = psecuritypriv->DefKeylen[psecuritypriv-> + PrivacyKeyIndex]; + for (curfragnum = 0; curfragnum < pattrib->nr_frags; + curfragnum++) { + iv = pframe+pattrib->hdrlen; + memcpy(&wepkey[0], iv, 3); + memcpy(&wepkey[3], &psecuritypriv->DefKey[ + psecuritypriv->PrivacyKeyIndex].skey[0], + keylength); + payload = pframe+pattrib->iv_len+pattrib->hdrlen; + if ((curfragnum + 1) == pattrib->nr_frags) { + length = pattrib->last_txcmdsz-pattrib-> + hdrlen-pattrib->iv_len - + pattrib->icv_len; + *((u32 *)crc) = cpu_to_le32(getcrc32( + payload, length)); + arcfour_init(&mycontext, wepkey, 3 + keylength); + 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; + *((u32 *)crc) = cpu_to_le32(getcrc32( + payload, length)); + arcfour_init(&mycontext, wepkey, 3 + keylength); + arcfour_encrypt(&mycontext, payload, payload, + length); + arcfour_encrypt(&mycontext, payload+length, + crc, 4); + pframe += pxmitpriv->frag_len; + pframe = (u8 *)RND4((addr_t)(pframe)); + } + } + } +} + +void r8712_wep_decrypt(struct _adapter *padapter, u8 *precvframe) +{ + /* exclude ICV */ + u8 crc[4]; + struct arc4context mycontext; + u32 length, keylength; + u8 *pframe, *payload, *iv, wepkey[16]; + u8 keyindex; + struct rx_pkt_attrib *prxattrib = &(((union recv_frame *) + precvframe)->u.hdr.attrib); + struct security_priv *psecuritypriv = &padapter->securitypriv; + + pframe = (unsigned char *)((union recv_frame *)precvframe)-> + u.hdr.rx_data; + /* start to decrypt recvframe */ + if ((prxattrib->encrypt == _WEP40_) || (prxattrib->encrypt == + _WEP104_)) { + iv = pframe + prxattrib->hdrlen; + keyindex = (iv[3] & 0x3); + keylength = psecuritypriv->DefKeylen[keyindex]; + memcpy(&wepkey[0], iv, 3); + memcpy(&wepkey[3], &psecuritypriv->DefKey[ + psecuritypriv->PrivacyKeyIndex].skey[0], + keylength); + length = ((union recv_frame *)precvframe)-> + u.hdr.len-prxattrib->hdrlen-prxattrib->iv_len; + payload = pframe+prxattrib->iv_len+prxattrib->hdrlen; + /* decrypt payload include icv */ + arcfour_init(&mycontext, wepkey, 3 + keylength); + arcfour_encrypt(&mycontext, payload, payload, length); + /* calculate icv and compare the icv */ + *((u32 *)crc) = cpu_to_le32(getcrc32(payload, length - 4)); + } + return; +} + +/* 3 =====TKIP related===== */ + +static u32 secmicgetuint32(u8 *p) +/* Convert from Byte[] to Us4Byte32 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 Us4Byte32 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 r8712_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); +} + +static void secmicappendbyte(struct mic_data *pmicdata, u8 b) +{ + /* Append the byte to our word-sized buffer */ + pmicdata->M |= ((u32)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 r8712_secmicappend(struct mic_data *pmicdata, u8 * src, u32 nbytes) +{ + /* This is simple */ + while (nbytes > 0) { + secmicappendbyte(pmicdata, *src++); + nbytes--; + } +} + +void r8712_secgetmic(struct mic_data *pmicdata, u8 *dst) +{ + /* Append the minimum padding */ + secmicappendbyte(pmicdata, 0x5a); + secmicappendbyte(pmicdata, 0); + secmicappendbyte(pmicdata, 0); + secmicappendbyte(pmicdata, 0); + secmicappendbyte(pmicdata, 0); + /* and then zeroes until the length is a multiple of 4 */ + while (pmicdata->nBytesInM != 0) + 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 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}; + + r8712_secmicsetkey(&micdata, key); + priority[0] = pri; + /* Michael MIC pseudo header: DA, SA, 3 x 0, Priority */ + if (header[1] & 1) { /* ToDS==1 */ + r8712_secmicappend(&micdata, &header[16], 6); /* DA */ + if (header[1] & 2) /* From Ds==1 */ + r8712_secmicappend(&micdata, &header[24], 6); + else + r8712_secmicappend(&micdata, &header[10], 6); + } else { /* ToDS==0 */ + r8712_secmicappend(&micdata, &header[4], 6); /* DA */ + if (header[1] & 2) /* From Ds==1 */ + r8712_secmicappend(&micdata, &header[16], 6); + else + r8712_secmicappend(&micdata, &header[10], 6); + } + r8712_secmicappend(&micdata, &priority[0], 4); + r8712_secmicappend(&micdata, data, data_len); + r8712_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 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) +{ + sint 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 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) +{ + sint 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 r8712_tkip_encrypt(struct _adapter *padapter, u8 *pxmitframe) +{ /* exclude ICV */ + u16 pnl; + u32 pnh; + u8 rc4key[16]; + u8 ttkey[16]; + u8 crc[4]; + struct arc4context mycontext; + u32 curfragnum, length, prwskeylen; + + u8 *pframe, *payload, *iv, *prwskey; + union pn48 txpn; + struct sta_info *stainfo; + struct pkt_attrib *pattrib = &((struct xmit_frame *)pxmitframe)->attrib; + struct xmit_priv *pxmitpriv = &padapter->xmitpriv; + u32 res = _SUCCESS; + + if (((struct xmit_frame *)pxmitframe)->buf_addr == NULL) + return _FAIL; + + pframe = ((struct xmit_frame *)pxmitframe)->buf_addr+TXDESC_OFFSET; + /* 4 start to encrypt each fragment */ + if (pattrib->encrypt == _TKIP_) { + if (pattrib->psta) + stainfo = pattrib->psta; + else + stainfo = r8712_get_stainfo(&padapter->stapriv, + &pattrib->ra[0]); + if (stainfo != NULL) { + prwskey = &stainfo->x_UncstKey.skey[0]; + prwskeylen = 16; + for (curfragnum = 0; curfragnum < pattrib->nr_frags; + curfragnum++) { + iv = pframe + pattrib->hdrlen; + payload = pframe+pattrib->iv_len + + pattrib->hdrlen; + GET_TKIP_PN(iv, txpn); + pnl = (u16)(txpn.val); + pnh = (u32)(txpn.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; + *((u32 *)crc) = cpu_to_le32( + getcrc32(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; + *((u32 *)crc) = cpu_to_le32(getcrc32( + payload, length)); + arcfour_init(&mycontext, rc4key, 16); + arcfour_encrypt(&mycontext, payload, + payload, length); + arcfour_encrypt(&mycontext, + payload+length, crc, 4); + pframe += pxmitpriv->frag_len; + pframe = (u8 *)RND4((addr_t)(pframe)); + } + } + } else + res = _FAIL; + } + return res; +} + +/* The hlen doesn't include the IV */ +u32 r8712_tkip_decrypt(struct _adapter *padapter, u8 *precvframe) +{ /* exclude ICV */ + u16 pnl; + u32 pnh; + u8 rc4key[16]; + u8 ttkey[16]; + u8 crc[4]; + struct arc4context mycontext; + u32 length, prwskeylen; + u8 *pframe, *payload, *iv, *prwskey, idx = 0; + union pn48 txpn; + struct sta_info *stainfo; + struct rx_pkt_attrib *prxattrib = &((union recv_frame *) + precvframe)->u.hdr.attrib; + struct security_priv *psecuritypriv = &padapter->securitypriv; + + pframe = (unsigned char *)((union recv_frame *) + precvframe)->u.hdr.rx_data; + /* 4 start to decrypt recvframe */ + if (prxattrib->encrypt == _TKIP_) { + stainfo = r8712_get_stainfo(&padapter->stapriv, + &prxattrib->ta[0]); + if (stainfo != NULL) { + iv = pframe+prxattrib->hdrlen; + payload = pframe+prxattrib->iv_len + prxattrib->hdrlen; + length = ((union recv_frame *)precvframe)-> + u.hdr.len - prxattrib->hdrlen - + prxattrib->iv_len; + if (IS_MCAST(prxattrib->ra)) { + idx = iv[3]; + prwskey = &psecuritypriv->XGrpKey[ + ((idx >> 6) & 0x3) - 1].skey[0]; + if (psecuritypriv->binstallGrpkey == false) + return _FAIL; + } else + prwskey = &stainfo->x_UncstKey.skey[0]; + prwskeylen = 16; + GET_TKIP_PN(iv, txpn); + pnl = (u16)(txpn.val); + pnh = (u32)(txpn.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 */ + arcfour_init(&mycontext, rc4key, 16); + arcfour_encrypt(&mycontext, payload, payload, length); + *((u32 *)crc) = cpu_to_le32(getcrc32(payload, + length - 4)); + if (crc[3] != payload[length - 1] || + crc[2] != payload[length - 2] || + crc[1] != payload[length - 3] || + crc[0] != payload[length - 4]) + return _FAIL; + } else + return _FAIL; + } + return _SUCCESS; +} + +/* 3 =====AES related===== */ + +#define MAX_MSG_SIZE 2048 +/*****************************/ +/******** SBOX Table *********/ +/*****************************/ + +static const 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 +}; + +/****************************************/ +/* aes128k128d() */ +/* Performs a 128 bit AES encrypt with */ +/* 128 bit data. */ +/****************************************/ +static void xor_128(u8 *a, u8 *b, u8 *out) +{ + sint i; + + for (i = 0; i < 16; i++) + out[i] = a[i] ^ b[i]; +} + +static void xor_32(u8 *a, u8 *b, u8 *out) +{ + sint i; + for (i = 0; i < 4; i++) + out[i] = a[i] ^ b[i]; +} + +static u8 sbox(u8 a) +{ + return sbox_table[(sint)a]; +} + +static void next_key(u8 *key, sint 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) +{ + sint 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) +{ + sint 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) +{ + sint round; + sint 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, sint qc_exists, sint a4_exists, + u8 *mpdu, uint payload_length, u8 *pn_vector) +{ + sint 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]; + 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, sint 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 */ + /* Mute retry, more data and pwr mgt bits */ + mic_header1[3] = mpdu[1] & 0xc7; + 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, sint a4_exists, + sint qc_exists) +{ + sint 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, sint a4_exists, sint qc_exists, + u8 *mpdu, u8 *pn_vector, sint c) +{ + sint 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; + if (qc_exists && !a4_exists) + ctr_preload[1] = mpdu[24] & 0x0f; + for (i = 2; i < 8; i++) + ctr_preload[i] = mpdu[i + 8]; + for (i = 8; i < 14; i++) + ctr_preload[i] = pn_vector[13 - i]; + 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) +{ + sint i; + + for (i = 0; i < 16; i++) + out[i] = ina[i] ^ inb[i]; +} + +static sint aes_cipher(u8 *key, uint hdrlen, + u8 *pframe, uint plen) +{ + uint qc_exists, a4_exists, i, j, payload_remainder; + uint 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); + 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++]; + 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]; + 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 short final block, then pad it,*/ + /* encrypt and copy 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 r8712_aes_encrypt(struct _adapter *padapter, u8 *pxmitframe) +{ /* exclude ICV */ + /* Intermediate Buffers */ + sint curfragnum, length; + u32 prwskeylen; + u8 *pframe, *prwskey; + struct sta_info *stainfo; + struct pkt_attrib *pattrib = &((struct xmit_frame *) + pxmitframe)->attrib; + struct xmit_priv *pxmitpriv = &padapter->xmitpriv; + u32 res = _SUCCESS; + + if (((struct xmit_frame *)pxmitframe)->buf_addr == NULL) + return _FAIL; + pframe = ((struct xmit_frame *)pxmitframe)->buf_addr + TXDESC_OFFSET; + /* 4 start to encrypt each fragment */ + if ((pattrib->encrypt == _AES_)) { + if (pattrib->psta) + stainfo = pattrib->psta; + else + stainfo = r8712_get_stainfo(&padapter->stapriv, + &pattrib->ra[0]); + if (stainfo != NULL) { + prwskey = &stainfo->x_UncstKey.skey[0]; + prwskeylen = 16; + for (curfragnum = 0; curfragnum < pattrib->nr_frags; + curfragnum++) { + if ((curfragnum + 1) == pattrib->nr_frags) {\ + 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((addr_t)(pframe)); + } + } + } else + res = _FAIL; + } + return res; +} + +static sint 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; + uint 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); + /* start to decrypt the payload */ + /*(plen including llc, payload and mic) */ + num_blocks = (plen - 8) / 16; + 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 short final block, 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 */ + memcpy((void *)message, pframe, (hdrlen + plen + 8)); + 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 short final block, pad it,*/ + /* encrypt and copy 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 + plen]; + 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 */ + return _SUCCESS; +} + +u32 r8712_aes_decrypt(struct _adapter *padapter, u8 *precvframe) +{ /* exclude ICV */ + /* Intermediate Buffers */ + sint length; + u32 prwskeylen; + u8 *pframe, *prwskey, *iv, idx; + struct sta_info *stainfo; + struct rx_pkt_attrib *prxattrib = &((union recv_frame *) + precvframe)->u.hdr.attrib; + struct security_priv *psecuritypriv = &padapter->securitypriv; + + pframe = (unsigned char *)((union recv_frame*)precvframe)-> + u.hdr.rx_data; + /* 4 start to encrypt each fragment */ + if ((prxattrib->encrypt == _AES_)) { + stainfo = r8712_get_stainfo(&padapter->stapriv, + &prxattrib->ta[0]); + if (stainfo != NULL) { + if (IS_MCAST(prxattrib->ra)) { + iv = pframe+prxattrib->hdrlen; + idx = iv[3]; + prwskey = &psecuritypriv->XGrpKey[ + ((idx >> 6) & 0x3) - 1].skey[0]; + if (psecuritypriv->binstallGrpkey == false) + return _FAIL; + + } else + prwskey = &stainfo->x_UncstKey.skey[0]; + prwskeylen = 16; + length = ((union recv_frame *)precvframe)-> + u.hdr.len-prxattrib->hdrlen-prxattrib->iv_len; + aes_decipher(prwskey, prxattrib->hdrlen, pframe, + length); + } else + return _FAIL; + } + return _SUCCESS; +} + +void r8712_use_tkipkey_handler(void *FunctionContext) +{ + struct _adapter *padapter = (struct _adapter *)FunctionContext; + + padapter->securitypriv.busetkipkey = true; +} |
