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/*

 * Copyright 2002-2004, Instant802 Networks, Inc.

 * Copyright 2005, Devicescape Software, Inc.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#include <linux/kernel.h>

#include <linux/types.h>

#include <linux/netdevice.h>

#include <net/mac80211.h>

#include "ieee80211_key.h"

#include "tkip.h"

#include "wep.h"

/* TKIP key mixing functions */

#define PHASE1_LOOP_COUNT 8

/* 2-byte by 2-byte subset of the full AES S-box table; second part of this

 * table is identical to first part but byte-swapped */

static const u16 tkip_sbox[256] =

{

        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,

};

static inline u16 Mk16(u8 x, u8 y)

{

        return ((u16) x << 8) | (u16) y;

}

static inline u8 Hi8(u16 v)

{

        return v >> 8;

}

static inline u8 Lo8(u16 v)

{

        return v & 0xff;

}

static inline u16 Hi16(u32 v)

{

        return v >> 16;

}

static inline u16 Lo16(u32 v)

{

        return v & 0xffff;

}

static inline u16 RotR1(u16 v)

{

        return (v >> 1) | ((v & 0x0001) << 15);

}

static inline u16 tkip_S(u16 val)

{

        u16 a = tkip_sbox[Hi8(val)];

        return tkip_sbox[Lo8(val)] ^ Hi8(a) ^ (Lo8(a) << 8);

}

/* P1K := Phase1(TA, TK, TSC)

 * TA = transmitter address (48 bits)

 * TK = dot11DefaultKeyValue or dot11KeyMappingValue (128 bits)

 * TSC = TKIP sequence counter (48 bits, only 32 msb bits used)

 * P1K: 80 bits

 */

static void tkip_mixing_phase1(const u8 *ta, const u8 *tk, u32 tsc_IV32,

                               u16 *p1k)

{

        int i, j;

        p1k[0] = Lo16(tsc_IV32);

        p1k[1] = Hi16(tsc_IV32);

        p1k[2] = Mk16(ta[1], ta[0]);

        p1k[3] = Mk16(ta[3], ta[2]);

        p1k[4] = Mk16(ta[5], ta[4]);

        for (i = 0; i < PHASE1_LOOP_COUNT; i++) {

                j = 2 * (i & 1);

                p1k[0] += tkip_S(p1k[4] ^ Mk16(tk[ 1 + j], tk[ 0 + j]));

                p1k[1] += tkip_S(p1k[0] ^ Mk16(tk[ 5 + j], tk[ 4 + j]));

                p1k[2] += tkip_S(p1k[1] ^ Mk16(tk[ 9 + j], tk[ 8 + j]));

                p1k[3] += tkip_S(p1k[2] ^ Mk16(tk[13 + j], tk[12 + j]));

                p1k[4] += tkip_S(p1k[3] ^ Mk16(tk[ 1 + j], tk[ 0 + j])) + i;

        }

}

static void tkip_mixing_phase2(const u16 *p1k, const u8 *tk, u16 tsc_IV16,

                               u8 *rc4key)

{

        u16 ppk[6];

        int i;

        ppk[0] = p1k[0];

        ppk[1] = p1k[1];

        ppk[2] = p1k[2];

        ppk[3] = p1k[3];

        ppk[4] = p1k[4];

        ppk[5] = p1k[4] + tsc_IV16;

        ppk[0] += tkip_S(ppk[5] ^ Mk16(tk[ 1], tk[ 0]));

        ppk[1] += tkip_S(ppk[0] ^ Mk16(tk[ 3], tk[ 2]));

        ppk[2] += tkip_S(ppk[1] ^ Mk16(tk[ 5], tk[ 4]));

        ppk[3] += tkip_S(ppk[2] ^ Mk16(tk[ 7], tk[ 6]));

        ppk[4] += tkip_S(ppk[3] ^ Mk16(tk[ 9], tk[ 8]));

        ppk[5] += tkip_S(ppk[4] ^ Mk16(tk[11], tk[10]));

        ppk[0] +=  RotR1(ppk[5] ^ Mk16(tk[13], tk[12]));

        ppk[1] +=  RotR1(ppk[0] ^ Mk16(tk[15], tk[14]));

        ppk[2] +=  RotR1(ppk[1]);

        ppk[3] +=  RotR1(ppk[2]);

        ppk[4] +=  RotR1(ppk[3]);

        ppk[5] +=  RotR1(ppk[4]);

        rc4key[0] = Hi8(tsc_IV16);

        rc4key[1] = (Hi8(tsc_IV16) | 0x20) & 0x7f;

        rc4key[2] = Lo8(tsc_IV16);

        rc4key[3] = Lo8((ppk[5] ^ Mk16(tk[1], tk[0])) >> 1);

        for (i = 0; i < 6; i++) {

                rc4key[4 + 2 * i] = Lo8(ppk[i]);

                rc4key[5 + 2 * i] = Hi8(ppk[i]);

        }

}

/* Add TKIP IV and Ext. IV at @pos. @iv0, @iv1, and @iv2 are the first octets

 * of the IV. Returns pointer to the octet following IVs (i.e., beginning of

 * the packet payload). */

u8 * ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key *key,

                           u8 iv0, u8 iv1, u8 iv2)

{

        *pos++ = iv0;

        *pos++ = iv1;

        *pos++ = iv2;

        *pos++ = (key->conf.keyidx << 6) | (1 << 5) /* Ext IV */;

        *pos++ = key->u.tkip.iv32 & 0xff;

        *pos++ = (key->u.tkip.iv32 >> 8) & 0xff;

        *pos++ = (key->u.tkip.iv32 >> 16) & 0xff;

        *pos++ = (key->u.tkip.iv32 >> 24) & 0xff;

        return pos;

}

void ieee80211_tkip_gen_phase1key(struct ieee80211_key *key, u8 *ta,

                                  u16 *phase1key)

{

        tkip_mixing_phase1(ta, &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],

                           key->u.tkip.iv32, phase1key);

}

void ieee80211_tkip_gen_rc4key(struct ieee80211_key *key, u8 *ta,

                               u8 *rc4key)

{

        /* Calculate per-packet key */

        if (key->u.tkip.iv16 == 0 || !key->u.tkip.tx_initialized) {

                /* IV16 wrapped around - perform TKIP phase 1 */

                tkip_mixing_phase1(ta, &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],

                                   key->u.tkip.iv32, key->u.tkip.p1k);

                key->u.tkip.tx_initialized = 1;

        }

        tkip_mixing_phase2(key->u.tkip.p1k,

                           &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],

                           key->u.tkip.iv16, rc4key);

}

/* Encrypt packet payload with TKIP using @key. @pos is a pointer to the

 * beginning of the buffer containing payload. This payload must include

 * headroom of eight octets for IV and Ext. IV and taildroom of four octets

 * for ICV. @payload_len is the length of payload (_not_ including extra

 * headroom and tailroom). @ta is the transmitter addresses. */

void ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,

                                 struct ieee80211_key *key,

                                 u8 *pos, size_t payload_len, u8 *ta)

{

        u8 rc4key[16];

        ieee80211_tkip_gen_rc4key(key, ta, rc4key);

        pos = ieee80211_tkip_add_iv(pos, key, rc4key[0], rc4key[1], rc4key[2]);

        ieee80211_wep_encrypt_data(tfm, rc4key, 16, pos, payload_len);

}

/* Decrypt packet payload with TKIP using @key. @pos is a pointer to the

 * beginning of the buffer containing IEEE 802.11 header payload, i.e.,

 * including IV, Ext. IV, real data, Michael MIC, ICV. @payload_len is the

 * length of payload, including IV, Ext. IV, MIC, ICV.  */

int ieee80211_tkip_decrypt_data(struct crypto_blkcipher *tfm,

                                struct ieee80211_key *key,

                                u8 *payload, size_t payload_len, u8 *ta,

                                int only_iv, int queue,

                                u32 *out_iv32, u16 *out_iv16)

{

        u32 iv32;

        u32 iv16;

        u8 rc4key[16], keyid, *pos = payload;

        int res;

        if (payload_len < 12)

                return -1;

        iv16 = (pos[0] << 8) | pos[2];

        keyid = pos[3];

        iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24);

        pos += 8;

#ifdef CONFIG_TKIP_DEBUG

        {

                int i;

                printk(KERN_DEBUG "TKIP decrypt: data(len=%zd)", payload_len);

                for (i = 0; i < payload_len; i++)

                        printk(" %02x", payload[i]);

                printk("\n");

                printk(KERN_DEBUG "TKIP decrypt: iv16=%04x iv32=%08x\n",

                       iv16, iv32);

        }

#endif /* CONFIG_TKIP_DEBUG */

        if (!(keyid & (1 << 5)))

                return TKIP_DECRYPT_NO_EXT_IV;

        if ((keyid >> 6) != key->conf.keyidx)

                return TKIP_DECRYPT_INVALID_KEYIDX;

        if (key->u.tkip.rx_initialized[queue] &&

            (iv32 < key->u.tkip.iv32_rx[queue] ||

             (iv32 == key->u.tkip.iv32_rx[queue] &&

              iv16 <= key->u.tkip.iv16_rx[queue]))) {

#ifdef CONFIG_TKIP_DEBUG

                DECLARE_MAC_BUF(mac);

                printk(KERN_DEBUG "TKIP replay detected for RX frame from "

                       "%s (RX IV (%04x,%02x) <= prev. IV (%04x,%02x)\n",

                       print_mac(mac, ta),

                       iv32, iv16, key->u.tkip.iv32_rx[queue],

                       key->u.tkip.iv16_rx[queue]);

#endif /* CONFIG_TKIP_DEBUG */

                return TKIP_DECRYPT_REPLAY;

        }

        if (only_iv) {

                res = TKIP_DECRYPT_OK;

                key->u.tkip.rx_initialized[queue] = 1;

                goto done;

        }

        if (!key->u.tkip.rx_initialized[queue] ||

            key->u.tkip.iv32_rx[queue] != iv32) {

                key->u.tkip.rx_initialized[queue] = 1;

                /* IV16 wrapped around - perform TKIP phase 1 */

                tkip_mixing_phase1(ta, &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],

                                   iv32, key->u.tkip.p1k_rx[queue]);

#ifdef CONFIG_TKIP_DEBUG

                {

                        int i;

                        DECLARE_MAC_BUF(mac);

                        printk(KERN_DEBUG "TKIP decrypt: Phase1 TA=%s"

                               " TK=", print_mac(mac, ta));

                        for (i = 0; i < 16; i++)

                                printk("%02x ",

                                       key->conf.key[

                                                ALG_TKIP_TEMP_ENCR_KEY + i]);

                        printk("\n");

                        printk(KERN_DEBUG "TKIP decrypt: P1K=");

                        for (i = 0; i < 5; i++)

                                printk("%04x ", key->u.tkip.p1k_rx[queue][i]);

                        printk("\n");

                }

#endif /* CONFIG_TKIP_DEBUG */

        }

        tkip_mixing_phase2(key->u.tkip.p1k_rx[queue],

                           &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],

                           iv16, rc4key);

#ifdef CONFIG_TKIP_DEBUG

        {

                int i;

                printk(KERN_DEBUG "TKIP decrypt: Phase2 rc4key=");

                for (i = 0; i < 16; i++)

                        printk("%02x ", rc4key[i]);

                printk("\n");

        }

#endif /* CONFIG_TKIP_DEBUG */

        res = ieee80211_wep_decrypt_data(tfm, rc4key, 16, pos, payload_len - 12);

 done:

        if (res == TKIP_DECRYPT_OK) {

                /*

                 * Record previously received IV, will be copied into the

                 * key information after MIC verification. It is possible

                 * that we don't catch replays of fragments but that's ok

                 * because the Michael MIC verication will then fail.

                 */

                *out_iv32 = iv32;

                *out_iv16 = iv16;

        }

        return res;

}