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cmm_aes.c
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cmm_aes.c
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/*
*************************************************************************
* Ralink Tech Inc.
* 5F., No.36, Taiyuan St., Jhubei City,
* Hsinchu County 302,
* Taiwan, R.O.C.
*
* (c) Copyright 2002-2010, Ralink Technology, Inc.
*
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* 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., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
* *
*************************************************************************/
#include "rt_config.h"
/*****************************/
/******** SBOX Table *********/
/*****************************/
UCHAR SboxTable[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
};
VOID xor_32(
IN PUCHAR a,
IN PUCHAR b,
OUT PUCHAR out)
{
INT i;
for (i=0;i<4; i++)
{
out[i] = a[i] ^ b[i];
}
}
VOID xor_128(
IN PUCHAR a,
IN PUCHAR b,
OUT PUCHAR out)
{
INT i;
for (i=0;i<16; i++)
{
out[i] = a[i] ^ b[i];
}
}
UCHAR RTMPCkipSbox(
IN UCHAR a)
{
return SboxTable[(int)a];
}
VOID next_key(
IN PUCHAR key,
IN INT round)
{
UCHAR rcon;
UCHAR sbox_key[4];
UCHAR rcon_table[12] =
{
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80,
0x1b, 0x36, 0x36, 0x36
};
sbox_key[0] = RTMPCkipSbox(key[13]);
sbox_key[1] = RTMPCkipSbox(key[14]);
sbox_key[2] = RTMPCkipSbox(key[15]);
sbox_key[3] = RTMPCkipSbox(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]);
}
VOID byte_sub(
IN PUCHAR in,
OUT PUCHAR out)
{
INT i;
for (i=0; i< 16; i++)
{
out[i] = RTMPCkipSbox(in[i]);
}
}
/************************************/
/* bitwise_xor() */
/* A 128 bit, bitwise exclusive or */
/************************************/
void bitwise_xor(unsigned char *ina, unsigned char *inb, unsigned char *out)
{
int i;
for (i=0; i<16; i++)
{
out[i] = ina[i] ^ inb[i];
}
}
VOID shift_row(
IN PUCHAR in,
OUT PUCHAR 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];
}
VOID mix_column(
IN PUCHAR in,
OUT PUCHAR out)
{
INT i;
UCHAR add1b[4];
UCHAR add1bf7[4];
UCHAR rotl[4];
UCHAR swap_halfs[4];
UCHAR andf7[4];
UCHAR rotr[4];
UCHAR temp[4];
UCHAR 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 halfs */
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);
}
/************************************************/
/* construct_mic_header1() */
/* Builds the first MIC header block from */
/* header fields. */
/************************************************/
void construct_mic_header1(
unsigned char *mic_header1,
int header_length,
unsigned char *mpdu)
{
mic_header1[0] = (unsigned char)((header_length - 2) / 256);
mic_header1[1] = (unsigned char)((header_length - 2) % 256);
mic_header1[2] = mpdu[0] & 0xcf; /* Mute CF poll & CF ack bits */
mic_header1[3] = mpdu[1] & 0xc7; /* Mute retry, more data and pwr mgt bits */
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. */
/************************************************/
void construct_mic_header2(
unsigned char *mic_header2,
unsigned char *mpdu,
int a4_exists,
int qc_exists)
{
int 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];
// In Sequence Control field, mute sequence numer bits (12-bit)
mic_header2[6] = mpdu[22] & 0x0f; /* SC */
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_iv() */
/* Builds the MIC IV from header fields and PN */
/************************************************/
void construct_mic_iv(
unsigned char *mic_iv,
int qc_exists,
int a4_exists,
unsigned char *mpdu,
unsigned int payload_length,
unsigned char *pn_vector)
{
int 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]; /* mic_iv[2:7] = A2[0:5] = mpdu[10:15] */
#ifdef CONSISTENT_PN_ORDER
for (i = 8; i < 14; i++)
mic_iv[i] = pn_vector[i - 8]; /* mic_iv[8:13] = PN[0:5] */
#else
for (i = 8; i < 14; i++)
mic_iv[i] = pn_vector[13 - i]; /* mic_iv[8:13] = PN[5:0] */
#endif
i = (payload_length / 256);
i = (payload_length % 256);
mic_iv[14] = (unsigned char) (payload_length / 256);
mic_iv[15] = (unsigned char) (payload_length % 256);
}
/****************************************/
/* aes128k128d() */
/* Performs a 128 bit AES encrypt with */
/* 128 bit data. */
/****************************************/
void aes128k128d(unsigned char *key, unsigned char *data, unsigned char *ciphertext)
{
int round;
int i;
unsigned char intermediatea[16];
unsigned char intermediateb[16];
unsigned char 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);
}
}
}
void construct_ctr_preload(
unsigned char *ctr_preload,
int a4_exists,
int qc_exists,
unsigned char *mpdu,
unsigned char *pn_vector,
int c)
{
int i = 0;
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; /* QoC_Control */
if (qc_exists && !a4_exists) ctr_preload[1] = mpdu[24] & 0x0f;
for (i = 2; i < 8; i++)
ctr_preload[i] = mpdu[i + 8]; /* ctr_preload[2:7] = A2[0:5] = mpdu[10:15] */
#ifdef CONSISTENT_PN_ORDER
for (i = 8; i < 14; i++)
ctr_preload[i] = pn_vector[i - 8]; /* ctr_preload[8:13] = PN[0:5] */
#else
for (i = 8; i < 14; i++)
ctr_preload[i] = pn_vector[13 - i]; /* ctr_preload[8:13] = PN[5:0] */
#endif
ctr_preload[14] = (unsigned char) (c / 256); // Ctr
ctr_preload[15] = (unsigned char) (c % 256);
}
BOOLEAN RTMPSoftDecryptAES(
IN PRTMP_ADAPTER pAd,
IN PUCHAR pData,
IN ULONG DataByteCnt,
IN PCIPHER_KEY pWpaKey)
{
UINT HeaderLen;
UCHAR PN[6];
UINT payload_len;
UINT num_blocks;
UINT payload_remainder;
USHORT fc;
UCHAR fc0;
UCHAR fc1;
UINT frame_type;
UINT frame_subtype;
UINT from_ds;
UINT to_ds;
INT a4_exists;
INT qc_exists;
UCHAR aes_out[16];
int payload_index;
UINT i;
UCHAR ctr_preload[16];
UCHAR chain_buffer[16];
UCHAR padded_buffer[16];
UCHAR mic_iv[16];
UCHAR mic_header1[16];
UCHAR mic_header2[16];
UCHAR MIC[8];
UCHAR TrailMIC[8];
#ifdef RT_BIG_ENDIAN
RTMPFrameEndianChange(pAd, (PUCHAR)pData, DIR_READ, FALSE);
#endif
fc0 = *pData;
fc1 = *(pData + 1);
fc = *((PUSHORT)pData);
frame_type = ((fc0 >> 2) & 0x03);
frame_subtype = ((fc0 >> 4) & 0x0f);
from_ds = (fc1 & 0x2) >> 1;
to_ds = (fc1 & 0x1);
a4_exists = (from_ds & to_ds);
qc_exists = ((frame_subtype == 0x08) || /* Assumed QoS subtypes */
(frame_subtype == 0x09) || /* Likely to change. */
(frame_subtype == 0x0a) ||
(frame_subtype == 0x0b)
);
HeaderLen = 24;
if (a4_exists)
HeaderLen += 6;
if (qc_exists)
HeaderLen += 2;
if (pWpaKey->KeyLen == 0)
{
DBGPRINT(RT_DEBUG_TRACE, ("RTMPSoftDecryptAES failed!(the Length can not be 0)\n"));
return FALSE;
}
PN[0] = *(pData+ HeaderLen);
PN[1] = *(pData+ HeaderLen + 1);
PN[2] = *(pData+ HeaderLen + 4);
PN[3] = *(pData+ HeaderLen + 5);
PN[4] = *(pData+ HeaderLen + 6);
PN[5] = *(pData+ HeaderLen + 7);
payload_len = DataByteCnt - HeaderLen - 8 - 8; // 8 bytes for CCMP header , 8 bytes for MIC
payload_remainder = (payload_len) % 16;
num_blocks = (payload_len) / 16;
// Find start of payload
payload_index = HeaderLen + 8; //IV+EIV
for (i=0; i< num_blocks; i++)
{
construct_ctr_preload(ctr_preload,
a4_exists,
qc_exists,
pData,
PN,
i+1 );
aes128k128d(pWpaKey->Key, ctr_preload, aes_out);
bitwise_xor(aes_out, pData + payload_index, chain_buffer);
NdisMoveMemory(pData + payload_index - 8, chain_buffer, 16);
payload_index += 16;
}
//
// If there is a short final block, then pad it
// encrypt it and copy the unpadded part back
//
if (payload_remainder > 0)
{
construct_ctr_preload(ctr_preload,
a4_exists,
qc_exists,
pData,
PN,
num_blocks + 1);
NdisZeroMemory(padded_buffer, 16);
NdisMoveMemory(padded_buffer, pData + payload_index, payload_remainder);
aes128k128d(pWpaKey->Key, ctr_preload, aes_out);
bitwise_xor(aes_out, padded_buffer, chain_buffer);
NdisMoveMemory(pData + payload_index - 8, chain_buffer, payload_remainder);
payload_index += payload_remainder;
}
//
// Descrypt the MIC
//
construct_ctr_preload(ctr_preload,
a4_exists,
qc_exists,
pData,
PN,
0);
NdisZeroMemory(padded_buffer, 16);
NdisMoveMemory(padded_buffer, pData + payload_index, 8);
aes128k128d(pWpaKey->Key, ctr_preload, aes_out);
bitwise_xor(aes_out, padded_buffer, chain_buffer);
NdisMoveMemory(TrailMIC, chain_buffer, 8);
//
// Calculate MIC
//
//Force the protected frame bit on
*(pData + 1) = *(pData + 1) | 0x40;
// Find start of payload
// Because the CCMP header has been removed
payload_index = HeaderLen;
construct_mic_iv(
mic_iv,
qc_exists,
a4_exists,
pData,
payload_len,
PN);
construct_mic_header1(
mic_header1,
HeaderLen,
pData);
construct_mic_header2(
mic_header2,
pData,
a4_exists,
qc_exists);
aes128k128d(pWpaKey->Key, mic_iv, aes_out);
bitwise_xor(aes_out, mic_header1, chain_buffer);
aes128k128d(pWpaKey->Key, chain_buffer, aes_out);
bitwise_xor(aes_out, mic_header2, chain_buffer);
aes128k128d(pWpaKey->Key, chain_buffer, aes_out);
// iterate through each 16 byte payload block
for (i = 0; i < num_blocks; i++)
{
bitwise_xor(aes_out, pData + payload_index, chain_buffer);
payload_index += 16;
aes128k128d(pWpaKey->Key, chain_buffer, aes_out);
}
// Add on the final payload block if it needs padding
if (payload_remainder > 0)
{
NdisZeroMemory(padded_buffer, 16);
NdisMoveMemory(padded_buffer, pData + payload_index, payload_remainder);
bitwise_xor(aes_out, padded_buffer, chain_buffer);
aes128k128d(pWpaKey->Key, chain_buffer, aes_out);
}
// aes_out contains padded mic, discard most significant
// 8 bytes to generate 64 bit MIC
for (i = 0 ; i < 8; i++) MIC[i] = aes_out[i];
if (!NdisEqualMemory(MIC, TrailMIC, 8))
{
DBGPRINT(RT_DEBUG_ERROR, ("RTMPSoftDecryptAES, MIC Error !\n")); //MIC error.
return FALSE;
}
#ifdef RT_BIG_ENDIAN
RTMPFrameEndianChange(pAd, (PUCHAR)pData, DIR_READ, FALSE);
#endif
return TRUE;
}
/*
========================================================================
Routine Description:
Construct AAD of CCMP.
Arguments:
Return Value:
Note:
It's described in IEEE Std 802.11-2007.
The AAD is constructed from the MPDU header.
========================================================================
*/
VOID RTMPConstructCCMPAAD(
IN PUCHAR pHdr,
IN BOOLEAN isDataFrame,
IN UINT8 a4_exists,
IN UINT8 qc_exists,
OUT UCHAR *aad_hdr,
OUT UINT *aad_len)
{
UINT len = 0;
/* Frame control -
Subtype bits (bits 4 5 6) in a Data MPDU masked to 0
Retry bit (bit 11) masked to 0
PwrMgt bit (bit 12) masked to 0
MoreData bit (bit 13) masked to 0
Protected Frame bit (bit 14) always set to 1 */
if (isDataFrame)
aad_hdr[0] = (*pHdr) & 0x8f;
else
aad_hdr[0] = (*pHdr);
aad_hdr[1] = (*(pHdr + 1)) & 0xc7;
aad_hdr[1] = aad_hdr[1] | 0x40;
len = 2;
/* Append Addr 1, 2 & 3 */
NdisMoveMemory(&aad_hdr[len], pHdr + 4, 3 * MAC_ADDR_LEN);
len += (3 * MAC_ADDR_LEN);
/* SC -
MPDU Sequence Control field, with the Sequence Number
subfield (bits 4-15 of the Sequence Control field)
masked to 0. The Fragment Number subfield is not modified. */
aad_hdr[len] = (*(pHdr + 22)) & 0x0f;
aad_hdr[len + 1] = 0x00;
len += 2;
/* Append the Addr4 field if present. */
if (a4_exists)
{
NdisMoveMemory(&aad_hdr[len], pHdr + 24, MAC_ADDR_LEN);
len += MAC_ADDR_LEN;
}
/* QC -
QoS Control field, if present, a 2-octet field that includes
the MSDU priority. The QC TID field is used in the
construction of the AAD and the remaining QC fields are
set to 0 for the AAD calculation (bits 4 to 15 are set to 0). */
if (qc_exists & a4_exists)
{
aad_hdr[len] = (*(pHdr + 30)) & 0x0f; // Qos_TC
aad_hdr[len + 1] = 0x00;
len += 2;
}
else if (qc_exists & !a4_exists)
{
aad_hdr[len] = (*(pHdr + 24)) & 0x0f; // Qos_TC
aad_hdr[len + 1] = 0x00;
len += 2;
}
*aad_len = len;
}
/*
========================================================================
Routine Description:
Construct NONCE header of CCMP.
Arguments:
Return Value:
Note:
========================================================================
*/
VOID RTMPConstructCCMPNonce(
IN PUCHAR pHdr,
IN UINT8 a4_exists,
IN UINT8 qc_exists,
IN BOOLEAN isMgmtFrame,
IN UCHAR *pn,
OUT UCHAR *nonce_hdr,
OUT UINT *nonce_hdr_len)
{
UINT n_offset = 0;
INT i;
/* Decide the Priority Octet
The Priority sub-field of the Nonce Flags field shall
be set to the fixed value 0 when there is no QC field
present in the MPDU header. When the QC field is present,
bits 0 to 3 of the Priority field shall be set to the
value of the QC TID (bits 0 to 3 of the QC field).*/
if (qc_exists && a4_exists)
nonce_hdr[0] = (*(pHdr + 30)) & 0x0f;
if (qc_exists && !a4_exists)
nonce_hdr[0] = (*(pHdr + 24)) & 0x0f;
n_offset += 1;
/* Fill in MPDU Address A2 field */
NdisMoveMemory(&nonce_hdr[n_offset], pHdr + 10, MAC_ADDR_LEN);
n_offset += MAC_ADDR_LEN;
/* Fill in the PN. The PN field occupies octets 7¡V12.
The octets of PN shall be ordered so that PN0 is at octet index 12
and PN5 is at octet index 7. */
for (i = 0; i < 6; i++)
nonce_hdr[n_offset + i] = pn[5 - i];
n_offset += LEN_PN;
*nonce_hdr_len = n_offset;
}
/*
========================================================================
Routine Description:
Construct CCMP header.
Arguments:
Return Value:
Note:
It's a 8-octets header.
========================================================================
*/
VOID RTMPConstructCCMPHdr(
IN UINT8 key_idx,
IN UCHAR *pn,
OUT UCHAR *ccmp_hdr)
{
NdisZeroMemory(ccmp_hdr, LEN_CCMP_HDR);
ccmp_hdr[0] = pn[0];
ccmp_hdr[1] = pn[1];
ccmp_hdr[3] = (key_idx <<6) | 0x20;
ccmp_hdr[4] = pn[2];
ccmp_hdr[5] = pn[3];
ccmp_hdr[6] = pn[4];
ccmp_hdr[7] = pn[5];
}
/*
========================================================================
Routine Description:
Arguments:
Return Value:
Note:
========================================================================
*/
BOOLEAN RTMPSoftEncryptCCMP(
IN PRTMP_ADAPTER pAd,
IN PUCHAR pHdr,
IN PUCHAR pIV,
IN PUCHAR pKey,
INOUT PUCHAR pData,
IN UINT32 DataLen)
{
UINT8 frame_type, frame_subtype;
UINT8 from_ds, to_ds;
UINT8 a4_exists, qc_exists;
UINT8 aad_hdr[30];
UINT aad_len = 0;
UINT8 nonce_hdr[13];
UINT32 nonce_hdr_len = 0;
UINT32 out_len = DataLen + 8;
#ifdef RT_BIG_ENDIAN
RTMPFrameEndianChange(pAd, (PUCHAR)pHdr, DIR_READ, FALSE);
#endif
/* Initial variable */
NdisZeroMemory(aad_hdr, 30);
NdisZeroMemory(nonce_hdr, 13);
/* Indicate type and subtype of Frame Control field */
frame_type = (((*pHdr) >> 2) & 0x03);
frame_subtype = (((*pHdr) >> 4) & 0x0f);
/* Indicate the fromDS and ToDS */
from_ds = ((*(pHdr + 1)) & 0x2) >> 1;
to_ds = ((*(pHdr + 1)) & 0x1);
/* decide if the Address 4 exist or QoS exist */
a4_exists = (from_ds & to_ds);
qc_exists = ((frame_subtype == SUBTYPE_QDATA) ||
(frame_subtype == SUBTYPE_QDATA_CFACK) ||
(frame_subtype == SUBTYPE_QDATA_CFPOLL) ||
(frame_subtype == SUBTYPE_QDATA_CFACK_CFPOLL));
/* Construct AAD header */
RTMPConstructCCMPAAD(pHdr,
(frame_type == BTYPE_DATA),
a4_exists,
qc_exists,
aad_hdr,
&aad_len);
/* Construct NONCE header */
RTMPConstructCCMPNonce(pHdr,
a4_exists,
qc_exists,
(frame_type == BTYPE_MGMT),
pIV,
nonce_hdr,
&nonce_hdr_len);
/* CCM originator processing -
Use the temporal key, AAD, nonce, and MPDU data to
form the cipher text and MIC. */
if (AES_CCM_Encrypt(pData, DataLen,
pKey, 16,
nonce_hdr, nonce_hdr_len,
aad_hdr, aad_len, LEN_CCMP_MIC,
pData, &out_len))
return FALSE;
#ifdef RT_BIG_ENDIAN
RTMPFrameEndianChange(pAd, (PUCHAR)pHdr, DIR_READ, FALSE);
#endif
return TRUE;
}
/*
========================================================================
Routine Description:
Decrypt data with CCMP.
Arguments:
Return Value:
Note:
========================================================================
*/
BOOLEAN RTMPSoftDecryptCCMP(
IN PRTMP_ADAPTER pAd,
IN PUCHAR pHdr,
IN PCIPHER_KEY pKey,
INOUT PUCHAR pData,
INOUT UINT16 *DataLen)
{
UINT8 frame_type, frame_subtype;
UINT8 from_ds, to_ds;
UINT8 a4_exists, qc_exists;
UINT8 aad_hdr[30];
UINT aad_len = 0;
UINT8 pn[LEN_PN];
PUCHAR cipherData_ptr;
UINT32 cipherData_len;
UINT8 nonce_hdr[13];
UINT32 nonce_hdr_len = 0;
UINT32 out_len = *DataLen;
#ifdef RT_BIG_ENDIAN
RTMPFrameEndianChange(pAd, (PUCHAR)pHdr, DIR_READ, FALSE);
#endif
/* Check the key is valid */
if (pKey->KeyLen == 0)
{
DBGPRINT(RT_DEBUG_ERROR, ("%s : The key is not available !\n", __FUNCTION__));
return FALSE;
}
/* Initial variable */
NdisZeroMemory(aad_hdr, 30);
NdisZeroMemory(nonce_hdr, 13);
/* Indicate type and subtype of Frame Control field */
frame_type = (((*pHdr) >> 2) & 0x03);
frame_subtype = (((*pHdr) >> 4) & 0x0f);
/* Indicate the fromDS and ToDS */
from_ds = ((*(pHdr + 1)) & 0x2) >> 1;
to_ds = ((*(pHdr + 1)) & 0x1);
/* decide if the Address 4 exist or QoS exist */
a4_exists = (from_ds & to_ds);
qc_exists = ((frame_subtype == SUBTYPE_QDATA) ||
(frame_subtype == SUBTYPE_QDATA_CFACK) ||
(frame_subtype == SUBTYPE_QDATA_CFPOLL) ||
(frame_subtype == SUBTYPE_QDATA_CFACK_CFPOLL));
/* Extract PN and from CCMP header */
pn[0] = pData[0];
pn[1] = pData[1];
pn[2] = pData[4];
pn[3] = pData[5];
pn[4] = pData[6];
pn[5] = pData[7];
/* skip ccmp header */
cipherData_ptr = pData + LEN_CCMP_HDR;
cipherData_len = *DataLen - LEN_CCMP_HDR;
/* Construct AAD header */
RTMPConstructCCMPAAD(pHdr,
(frame_type == BTYPE_DATA),
a4_exists,
qc_exists,
aad_hdr,
&aad_len);
/* Construct NONCE header */
RTMPConstructCCMPNonce(pHdr,
a4_exists,
qc_exists,
(frame_type == BTYPE_MGMT),
pn,
nonce_hdr,
&nonce_hdr_len);
/* CCM recipient processing -
uses the temporal key, AAD, nonce, MIC,
and MPDU cipher text data */
if (AES_CCM_Decrypt(cipherData_ptr, cipherData_len,
pKey->Key, 16,
nonce_hdr, nonce_hdr_len,
aad_hdr, aad_len, LEN_CCMP_MIC,
pData, &out_len))
return FALSE;