The ICV is transmitted on the network as a 4 byte little endian
quantity. WEP encryption needs to swap the bytes before transmission
and decryption needs to swap bytes before ICV verification.
Index: wireless-dev/net/d80211/wep.c
===================================================================
--- wireless-dev.orig/net/d80211/wep.c 2006-09-10 14:50:52.073583400 +0000
+++ wireless-dev/net/d80211/wep.c 2006-09-10 14:51:10.146835848 +0000
@@ -121,9 +121,11 @@
{
struct scatterlist sg;
u32 *icv;
+ u32 crc;
icv = (u32 *)(data + data_len);
- *icv = ~crc32_le(~0, data, data_len);
+ crc = ~crc32_le(~0, data, data_len);
+ *icv = cpu_to_le32(crc);
crypto_cipher_setkey(tfm, rc4key, klen);
sg.page = virt_to_page(data);
@@ -196,6 +198,7 @@
crypto_cipher_decrypt(tfm, &sg, &sg, sg.length);
crc = ~crc32_le(~0, data, data_len);
+ crc = cpu_to_le32(crc);
if (memcmp(&crc, data + data_len, WEP_ICV_LEN) != 0)
/* ICV mismatch */
return -1;
--
-
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