CC2540 Broadcast模式下AES加密

求教CC2540 Broadcast模式下AES加密，在Broadcast使用LL_Encrypt进行加密，在Observer使用LL_EXT_Decrypt进行解密，解密数据不正确，仍然为变化的数据。是不是加密过程iv是配对绑定后确定的，而广播模式无法得到iv造成？有没有什么有效的解决方式？谢谢

这个有例子程序,请看下例子程序是否OK?

http://processors.wiki.ti.com/index.php/BLE_Encrypt_Adv_Data

This example show how to encrypt and de-crypt advertisement data using the TI CC254X AES calls. 

Download Source Files

File:BleEncryptBroadcastData.zip 

Based on RTM 1.4

SimpleBleBroadcaster.c
SimpleBleCentral.c

profiles/roles/Broadcaster.c
Updated Broadcaster profile to allow constant updates to adv data without stopping.This is being fixed for next release.

static uint8 dataCount=0;

uint8 key[16] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16};
uint8 plainText[16] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16};
uint8 encryptedData[16];

dataCount++;
plainText[0] = dataCount;

LL_Encrypt( key, plainText, encryptedData );

// GAP - Advertisement data (max size = 31 bytes, though this is
// best kept short to conserve power while advertisting)
uint8 advertData2[] =
{
// Flags; this sets the device to use limited discoverable
// mode (advertises for 30 seconds at a time) instead of general
// discoverable mode (advertises indefinitely)
0x02, // length of this data
GAP_ADTYPE_FLAGS,
GAP_ADTYPE_FLAGS_BREDR_NOT_SUPPORTED,

// three-byte broadcast of the data "1 2 3"
0x011, // length of this data including the data type byte
GAP_ADTYPE_MANUFACTURER_SPECIFIC, // manufacturer specific advertisement data type
encryptedData[0],
encryptedData[1],
encryptedData[2],
encryptedData[3],
encryptedData[4],
encryptedData[5],
encryptedData[6],
encryptedData[7],
encryptedData[8],
encryptedData[9],
encryptedData[10],
encryptedData[11],
encryptedData[12],
encryptedData[13],
encryptedData[14],
encryptedData[15]
};

//update broadcast info
GAPRole_SetParameter( GAPROLE_ADVERT_DATA, sizeof( advertData2 ), advertData2 );

case GAP_DEVICE_INFO_EVENT:
{
// add some way to know address we are looking for to decrypt
if(pEvent->deviceInfo.dataLen==0x15)
{
static uint8 key[16] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16};
static uint8 encryptedData[16];
static uint8 plaintextData[16];

osal_memcpy(encryptedData,&(pEvent->deviceInfo.pEvtData[5]),16);

LL_EXT_Decrypt( key, encryptedData, plaintextData );

LCD_WRITE_STRING( bdAddr2Str( plaintextData ), HAL_LCD_LINE_2 );
}
}