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wlantest: Implement tkip_encrypt()

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Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-09-08 14:03:10 +03:00
parent 4425645113
commit 729f02e149
1 changed files with 49 additions and 2 deletions
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51
wlantest/tkip.c
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@ -376,6 +376,53 @@ void tkip_get_pn(u8 *pn, const u8 *data)
u8 * tkip_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen, u8 *qos, u8 * tkip_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen, u8 *qos,
u8 *pn, int keyid, size_t *encrypted_len) u8 *pn, int keyid, size_t *encrypted_len)
{ {
/* TODO */ u8 michael_hdr[16];
return NULL; u8 mic[8];
struct ieee80211_hdr *hdr;
u16 fc;
const u8 *mic_key;
u8 *crypt, *pos;
u16 iv16;
u32 iv32;
u16 ttak[5];
u8 rc4key[16];
if (len < sizeof(*hdr) || len < hdrlen)
return NULL;
hdr = (struct ieee80211_hdr *) frame;
fc = le_to_host16(hdr->frame_control);
michael_mic_hdr(hdr, michael_hdr);
mic_key = tk + ((fc & WLAN_FC_FROMDS) ? 16 : 24);
michael_mic(mic_key, michael_hdr, frame + hdrlen, len - hdrlen, mic);
wpa_hexdump(MSG_EXCESSIVE, "TKIP: MIC", mic, sizeof(mic));
iv32 = WPA_GET_BE32(pn);
iv16 = WPA_GET_BE16(pn + 4);
tkip_mixing_phase1(ttak, tk, hdr->addr2, iv32);
wpa_hexdump(MSG_EXCESSIVE, "TKIP TTAK", (u8 *) ttak, sizeof(ttak));
tkip_mixing_phase2(rc4key, tk, ttak, iv16);
wpa_hexdump(MSG_EXCESSIVE, "TKIP RC4KEY", rc4key, sizeof(rc4key));
crypt = os_malloc(len + 8 + sizeof(mic) + 4);
if (crypt == NULL)
return NULL;
os_memcpy(crypt, frame, hdrlen);
pos = crypt + hdrlen;
os_memcpy(pos, rc4key, 3);
pos += 3;
*pos++ = keyid << 6 | BIT(5);
*pos++ = pn[3];
*pos++ = pn[2];
*pos++ = pn[1];
*pos++ = pn[0];
os_memcpy(pos, frame + hdrlen, len - hdrlen);
os_memcpy(pos + len - hdrlen, mic, sizeof(mic));
WPA_PUT_LE32(pos + len - hdrlen + sizeof(mic),
crc32(pos, len - hdrlen + sizeof(mic)));
wep_crypt(rc4key, pos, len - hdrlen + sizeof(mic) + 4);
*encrypted_len = len + 8 + sizeof(mic) + 4;
return crypt;
} }