0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,	0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,	0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,	0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,	0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,	0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,	0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,	0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,	0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,	0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,	0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,	0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,	0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,	0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,	0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,	0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,	0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,	0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,	0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,	0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,	0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,	0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,	0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,	0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,	0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,	0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,	0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,	0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,	0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,	0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,	0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,	0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,	0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,	0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,	0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,	0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,	0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,	0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,	0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,	0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,	0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,	0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,	0x2d02ef8dL};static intwep_encrypt(struct ieee80211_key *key, struct sk_buff *skb0, int hdrlen){#define S_SWAP(a,b) do { uint8_t t = S[a]; S[a] = S[b]; S[b] = t; } while(0)	struct wep_ctx *ctx = key->wk_private;	struct ieee80211vap *vap = ctx->wc_vap;	struct sk_buff *skb = skb0;	u_int8_t rc4key[IEEE80211_WEP_IVLEN + IEEE80211_KEYBUF_SIZE];	uint8_t *icv;	uint32_t i, j, k, crc;	size_t buflen, data_len;	uint8_t S[256];	uint8_t *pos;	u_int off, keylen;	vap->iv_stats.is_crypto_wep++;	/* NB: this assumes the header was pulled up */	memcpy(rc4key, skb->data + hdrlen, IEEE80211_WEP_IVLEN);	memcpy(rc4key + IEEE80211_WEP_IVLEN, key->wk_key, key->wk_keylen);	/* Setup RC4 state */	for (i = 0; i < 256; i++)		S[i] = i;	j = 0;	keylen = key->wk_keylen + IEEE80211_WEP_IVLEN;	for (i = 0; i < 256; i++) {		j = (j + S[i] + rc4key[i % keylen]) & 0xff;		S_SWAP(i, j);	}	off = hdrlen + wep.ic_header;	data_len = skb->len - off;	/* Compute CRC32 over unencrypted data and apply RC4 to data */	crc = ~0;	i = j = 0;	pos = skb->data + off;	buflen = skb->len - off;	for (;;) {		if (buflen > data_len)			buflen = data_len;		data_len -= buflen;		for (k = 0; k < buflen; k++) {			crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8);			i = (i + 1) & 0xff;			j = (j + S[i]) & 0xff;			S_SWAP(i, j);			*pos++ ^= S[(S[i] + S[j]) & 0xff];		}		if (skb->next == NULL) {			if (data_len != 0) {		/* out of data */#ifdef IEEE80211_DEBUG				const struct ieee80211_frame *wh =				    (const struct ieee80211_frame *) skb0->data;#endif				IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,					wh->i_addr2,					"out of data for WEP (data_len %lu)",					(unsigned long) data_len);				return 0;			}			break;		}		skb = skb->next;		pos = skb->data;		buflen = skb->len;	}	crc = ~crc;	if (skb_tailroom(skb) < wep.ic_trailer) {#ifdef IEEE80211_DEBUG		const struct ieee80211_frame *wh =			(const struct ieee80211_frame *) skb0->data;#endif		/* NB: should not happen */		IEEE80211_NOTE_MAC(ctx->wc_vap, IEEE80211_MSG_CRYPTO,			wh->i_addr1, "no room for %s ICV, tailroom %u",			wep.ic_name, skb_tailroom(skb));		/* XXX statistic */		return 0;	}	/* Append little-endian CRC32 and encrypt it to produce ICV */	icv = skb_put(skb, IEEE80211_WEP_CRCLEN);	icv[0] = crc;	icv[1] = crc >> 8;	icv[2] = crc >> 16;	icv[3] = crc >> 24;	for (k = 0; k < IEEE80211_WEP_CRCLEN; k++) {		i = (i + 1) & 0xff;		j = (j + S[i]) & 0xff;		S_SWAP(i, j);		icv[k] ^= S[(S[i] + S[j]) & 0xff];	}	return 1;#undef S_SWAP}static intwep_decrypt(struct ieee80211_key *key, struct sk_buff *skb0, int hdrlen){#define S_SWAP(a,b) do { uint8_t t = S[a]; S[a] = S[b]; S[b] = t; } while(0)	struct wep_ctx *ctx = key->wk_private;	struct ieee80211vap *vap = ctx->wc_vap;	struct sk_buff *skb = skb0;	u_int8_t rc4key[IEEE80211_WEP_IVLEN + IEEE80211_KEYBUF_SIZE];	uint8_t icv[IEEE80211_WEP_CRCLEN];	uint32_t i, j, k, crc;	size_t buflen, data_len;	uint8_t S[256];	uint8_t *pos;	u_int off, keylen;	vap->iv_stats.is_crypto_wep++;	/* NB: this assumes the header was pulled up */	memcpy(rc4key, skb->data + hdrlen, IEEE80211_WEP_IVLEN);	memcpy(rc4key + IEEE80211_WEP_IVLEN, key->wk_key, key->wk_keylen);	/* Setup RC4 state */	for (i = 0; i < 256; i++)		S[i] = i;	j = 0;	keylen = key->wk_keylen + IEEE80211_WEP_IVLEN;	for (i = 0; i < 256; i++) {		j = (j + S[i] + rc4key[i % keylen]) & 0xff;		S_SWAP(i, j);	}	off = hdrlen + wep.ic_header;	data_len = skb->len - (off + wep.ic_trailer),	/* Compute CRC32 over unencrypted data and apply RC4 to data */	crc = ~0;	i = j = 0;	pos = skb->data + off;	buflen = skb->len - off;	for (;;) {		if (buflen > data_len)			buflen = data_len;		data_len -= buflen;		for (k = 0; k < buflen; k++) {			i = (i + 1) & 0xff;			j = (j + S[i]) & 0xff;			S_SWAP(i, j);			*pos ^= S[(S[i] + S[j]) & 0xff];			crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8);			pos++;		}		skb = skb->next;		if (skb == NULL) {			if (data_len != 0) {		/* out of data */#ifdef IEEE80211_DEBUG				const struct ieee80211_frame *wh =					(const struct ieee80211_frame *) skb0->data;#endif				IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,					wh->i_addr2,					"out of data for WEP (data_len %lu)",					(unsigned long) data_len);				return 0;			}			break;		}		pos = skb->data;		buflen = skb->len;	}	crc = ~crc;	/* Encrypt little-endian CRC32 and verify that it matches with	 * received ICV */	icv[0] = crc;	icv[1] = crc >> 8;	icv[2] = crc >> 16;	icv[3] = crc >> 24;	for (k = 0; k < IEEE80211_WEP_CRCLEN; k++) {		i = (i + 1) & 0xff;		j = (j + S[i]) & 0xff;		S_SWAP(i, j);		/* XXX assumes ICV is contiguous in sk_buf */		if ((icv[k] ^ S[(S[i] + S[j]) & 0xff]) != *pos++) {			/* ICV mismatch - drop frame */			return 0;		}	}	return 1;#undef S_SWAP}/* * Module glue. */MODULE_AUTHOR("Errno Consulting, Sam Leffler");MODULE_DESCRIPTION("802.11 wireless support: WEP cipher");#ifdef MODULE_LICENSEMODULE_LICENSE("Dual BSD/GPL");#endifstatic int __initinit_crypto_wep(void){	ieee80211_crypto_register(&wep);	return 0;}module_init(init_crypto_wep);static void __exitexit_crypto_wep(void){	ieee80211_crypto_unregister(&wep);}module_exit(exit_crypto_wep);