static int
checkRsnKeyMic(v_U32_t cryptHandle,
tAniPacket *eapolFrame,
tAniEapolRsnKeyDesc *rsnDesc,
v_U8_t *micKey,
v_U32_t micKeyLen)
{
int retVal = ANI_ERROR;
int len;
v_U8_t *ptr = NULL;
v_U8_t *micPos = NULL;
v_U8_t result[VOS_DIGEST_SHA1_SIZE]; // Larger of the two
v_U8_t incomingMic[ANI_EAPOL_KEY_RSN_MIC_SIZE];
if (!rsnDesc->info.micFlag)
{
VOS_ASSERT( 0 );
return ANI_E_ILLEGAL_ARG;
}
len = aniAsfPacketGetBytes(eapolFrame, &ptr);
if( ANI_IS_STATUS_SUCCESS( len ) )
{
micPos = ptr + ANI_SSM_RSN_KEY_MIC_OFFSET;
// Skip to the EAPOL version field for MIC computation
ptr += EAPOL_VERSION_POS;
len -= EAPOL_VERSION_POS;
// Copy existing MIC to temporary location and zero it out
vos_mem_copy( incomingMic, micPos, ANI_EAPOL_KEY_RSN_MIC_SIZE );
vos_mem_zero( micPos, ANI_EAPOL_KEY_RSN_MIC_SIZE );
if (rsnDesc->info.keyDescVers == ANI_EAPOL_KEY_DESC_VERS_AES)
{
if( VOS_IS_STATUS_SUCCESS( vos_sha1_hmac_str(cryptHandle, ptr, len, micKey, micKeyLen, result) ) )
{
retVal = ANI_OK;
}
}
else {
VOS_ASSERT( 0 );
retVal = ANI_E_ILLEGAL_ARG;
}
if (retVal == ANI_OK)
{
if ( !vos_mem_compare(incomingMic, result, ANI_EAPOL_KEY_RSN_MIC_SIZE))
{
retVal = ANI_E_MIC_FAILED;
}
}
}
return retVal;
}
int
aagPrf(v_U32_t cryptHandle,
v_U8_t result[AAG_PRF_MAX_OUTPUT_SIZE],
v_U8_t *key, v_U8_t keyLen,
v_U8_t *a, v_U8_t aLen,
v_U8_t *b, v_U8_t bLen,
v_U32_t prfLen)
{
static v_U8_t y;
v_U8_t *hmacText = NULL;
v_U8_t *resultOffset = result;
int numLoops;
int loopCtrPos;
int i, retVal=0;
hmacText = vos_mem_malloc( aLen + bLen + 2 );
if( NULL == hmacText )
{
return ANI_E_NULL_VALUE;
}
vos_mem_copy(hmacText + 0, a, aLen);
hmacText[aLen] = y;
vos_mem_copy(hmacText + aLen + 1, b, bLen);
loopCtrPos = aLen + 1 + bLen;
numLoops = prfLen + AAG_PTK_PRF_ADD_PARAM;
numLoops /= AAG_PTK_PRF_DIV_PARAM;
for (i = 0; i < numLoops; i++)
{
VOS_ASSERT((resultOffset - result + VOS_DIGEST_SHA1_SIZE)
<= AAG_PRF_MAX_OUTPUT_SIZE);
hmacText[loopCtrPos] = i;
if( VOS_IS_STATUS_SUCCESS( vos_sha1_hmac_str(cryptHandle, hmacText, loopCtrPos + 1, key, keyLen, resultOffset) ) )
{
resultOffset += VOS_DIGEST_SHA1_SIZE;
retVal = ANI_OK;
}
else
{
retVal = ANI_ERROR;
}
}
vos_mem_free(hmacText);
return retVal;
}
static int
writeRsnKeyMic(v_U32_t cryptHandle,
tAniPacket *eapolFrame,
tAniEapolRsnKeyDesc *rsnDesc,
v_U8_t *micKey,
v_U32_t micKeyLen)
{
int retVal = ANI_OK;
int len;
v_U8_t *ptr = NULL;
v_U8_t *micPos = NULL;
v_U8_t result[VOS_DIGEST_SHA1_SIZE]; // Larger of the two
// Sanity check the arguments and return if no MIC generation is
// needed
if (micKey != NULL)
{
if (micKeyLen == 0 || !rsnDesc->info.micFlag)
{
VOS_TRACE( VOS_MODULE_ID_BAP, VOS_TRACE_LEVEL_ERROR,
"Supp MIC key provided but micKeyLen or micFlag is not set!\n");
VOS_ASSERT( 0 );
return ANI_E_ILLEGAL_ARG;
}
}
else {
if (rsnDesc->info.micFlag)
{
VOS_TRACE( VOS_MODULE_ID_BAP, VOS_TRACE_LEVEL_ERROR,
"Supp micFlag is set but MIC key not provided!\n");
VOS_ASSERT( 0 );
return ANI_E_ILLEGAL_ARG;
}
// Normal condition where MIC is not desired by the caller
return ANI_OK;
}
len = aniAsfPacketGetBytes(eapolFrame, &ptr);
if( !ANI_IS_STATUS_SUCCESS( len ) )
{
return len;
}
micPos = ptr + ANI_SSM_RSN_KEY_MIC_OFFSET + SNAP_HEADER_SIZE;
// Clear the MIC field in the packet before the MIC computation
vos_mem_zero( micPos, VOS_DIGEST_MD5_SIZE);
// Skip to the EAPOL version field for MIC computation
ptr += EAPOL_VERSION_POS + SNAP_HEADER_SIZE;
len -= (EAPOL_VERSION_POS + SNAP_HEADER_SIZE);
if (rsnDesc->info.keyDescVers == ANI_EAPOL_KEY_DESC_VERS_AES)
{
if( VOS_IS_STATUS_SUCCESS( vos_sha1_hmac_str(cryptHandle, ptr, len, micKey, micKeyLen, result) ) )
{
retVal = ANI_OK;
}
else
{
retVal = ANI_ERROR;
}
}
else {
VOS_ASSERT( 0 );
retVal = ANI_E_ILLEGAL_ARG;
}
if (retVal == ANI_OK)
{
// Copy only 16B which is the smaller of the two and the same as
// ANI_EAPOL_KEY_RSN_MIC_SIZE
vos_mem_copy(micPos, result, VOS_DIGEST_MD5_SIZE);
}
return retVal;
}
static int
writeRsnKeyMic(v_U32_t cryptHandle,
tAniPacket *eapolFrame,
tAniEapolRsnKeyDesc *rsnDesc,
v_U8_t *micKey,
v_U32_t micKeyLen)
{
int retVal = ANI_OK;
int len;
v_U8_t *ptr = NULL;
v_U8_t *micPos = NULL;
v_U8_t result[VOS_DIGEST_SHA1_SIZE];
if (micKey != NULL)
{
if (micKeyLen == 0 || !rsnDesc->info.micFlag)
{
VOS_TRACE( VOS_MODULE_ID_BAP, VOS_TRACE_LEVEL_ERROR,
"Supp MIC key provided but micKeyLen or micFlag is not set!\n");
VOS_ASSERT( 0 );
return ANI_E_ILLEGAL_ARG;
}
}
else {
if (rsnDesc->info.micFlag)
{
VOS_TRACE( VOS_MODULE_ID_BAP, VOS_TRACE_LEVEL_ERROR,
"Supp micFlag is set but MIC key not provided!\n");
VOS_ASSERT( 0 );
return ANI_E_ILLEGAL_ARG;
}
return ANI_OK;
}
len = aniAsfPacketGetBytes(eapolFrame, &ptr);
if( !ANI_IS_STATUS_SUCCESS( len ) )
{
return len;
}
micPos = ptr + ANI_SSM_RSN_KEY_MIC_OFFSET + SNAP_HEADER_SIZE;
vos_mem_zero( micPos, VOS_DIGEST_MD5_SIZE);
ptr += EAPOL_VERSION_POS + SNAP_HEADER_SIZE;
len -= (EAPOL_VERSION_POS + SNAP_HEADER_SIZE);
if (rsnDesc->info.keyDescVers == ANI_EAPOL_KEY_DESC_VERS_AES)
{
if( VOS_IS_STATUS_SUCCESS( vos_sha1_hmac_str(cryptHandle, ptr, len, micKey, micKeyLen, result) ) )
{
retVal = ANI_OK;
}
else
{
retVal = ANI_ERROR;
}
}
else {
VOS_ASSERT( 0 );
retVal = ANI_E_ILLEGAL_ARG;
}
if (retVal == ANI_OK)
{
vos_mem_copy(micPos, result, VOS_DIGEST_MD5_SIZE);
}
return retVal;
}
