/// <summary>
/// 该方法先判断输入的nas信令是否加密，如果没有加密，则直接调用明文解析方法plain()进行解析；
/// 否则先进行解密，再进行明文解析
/// </summary>
/// <param name="nas_pdu">nas信令编码</param>
/// <param name="direction">该nas信令所在的s1ap信令的方向</param>
/// <param name="Kasme_1">从diameter信令中获得的Kasme list</param>
public void decrypt(byte[] nas_pdu, byte direction, List <byte[]> Kasme_1)
{
// 清空数据
cause_str = "";
byte proDiscriminator = 0, EBI = 0;
byte headType = 0;
byte sqn = 0;
byte header = 0;
bool ciper_or = false;
byte down_sqn = 0, up_sqn = 0;
uint count = 0;
List <byte[]> Kasme1 = new List <byte[]>();
byte[] Kasme = new byte[32];
byte[] Knas1 = new byte[32];
byte[] Knas = new byte[16];
proDiscriminator = (byte)(nas_pdu[0] & 0x0f); //指示nas信令类型是ESM or EMM
if (proDiscriminator == 0x07) //EMM 消息
{
headType = (byte)((nas_pdu[0] & 0xf0) >> 4);
}
else if (proDiscriminator == 0x02) //ESM消息
{
EBI = (byte)((nas_pdu[0] & 0xf0) >> 4); //EPS bear identity
}
//用于判断security header Type=2,4时，加密开关是否关闭，若关闭，则不需要进行解密。
if ((headType == 1) || (headType == 2) || (headType == 3) || (headType == 4)) //当headerType=1，2，3，4时才有nasPlain,sqn,header,ciper_or.
{
byte[] nasPlain = new byte[nas_pdu.Length - 6]; //nasPlain表示加密的nas部分，但是这只适宜于headertype=1,2,3,4的情况，不适于type=0.
sqn = nas_pdu[5]; //获得每条信令的序列号(对于service request有特殊情况，该表达式不是其序列号，故需要单独处理)
Array.Copy(nas_pdu, 6, nasPlain, 0, nasPlain.Length); //当nas不是plain message时（或者完整性保护，或者加密），去掉nas_pdu安全头部
//把剩余部分放在nasPlain中。
header = nasPlain[0]; //特征字节，指示nas信令是否属于nas esm 消息
ciper_or = field(header); //用于判断是否打开加密开关，如果是true，则加密开关关闭，不加密
if (headType == 1) //只进行完整性保护，不加密
{
#region
//用于计算加密所使用的参数COUNT
if (direction == 0)//方向下行（MME->eNB）
{
down_sqn = sqn;
if (System.Math.Abs(down_sqn - re_down_sqn) >= 128)
{
down_overflow++;
}
re_down_sqn = down_sqn;
count = (uint)(down_overflow << 8 | down_sqn); //把溢出值与序列号拼接
}
if (direction == 1) //方向上行（eNB->MME）
{
up_sqn = sqn;
if (System.Math.Abs(up_sqn - re_up_sqn) >= 128)
{
down_overflow++;
}
re_up_sqn = up_sqn;
count = (uint)(up_overflow << 8 | up_sqn);
}
cause_str = cause1.NasCause(nasPlain);//解析nas信令中的 cause
IndexCause = cause1.Index;
LengthCause = cause1.Length;
plain(nasPlain);
#endregion
}
else if (headType == 2)//完整性保护并加密(是否真的加密还需要判断加密开关是否打开)
{
#region
if (direction == 0)
{
down_sqn = sqn;
if (System.Math.Abs(down_sqn - re_down_sqn) >= 128)
{
down_overflow++;
}
re_down_sqn = down_sqn;
count = (uint)(down_overflow << 8 | down_sqn);//把溢出值与序列号拼接
}
if (direction == 1)
{
up_sqn = sqn;
if (System.Math.Abs(up_sqn - re_up_sqn) >= 128)
{
down_overflow++;
}
re_up_sqn = up_sqn;
count = (uint)(up_overflow << 8 | up_sqn);
}
if ((header == 0x07) || (ciper_or == true))//虽然安全头类型为2，但是加密开关关闭故不加密
{
plain(nasPlain);
IndexCause = cause1.Index;
LengthCause = cause1.Length;
}
else
{
if (Kasme_1.Count > 0) //diameter信令分配有根密钥
{
Kasme = Kasme_1[Kasme_i]; //在此处获得Kasme数组中合适的Kasme
//解密模块，注意三种算法的IK是不同的
if (algorithm == 1) //加密算法选择EEA1，即snow 3G，下面的解密方法具体见EEA1和KDF算法的介绍
{
#region
UInt32[] IK1 = new UInt32[4];//存放解密所需的IK值（count，方向，identity组成）
if (direction == 0)
{
IK1[0] = 0;
IK1[1] = count;
IK1[2] = 0;
IK1[3] = count;
}
if (direction == 1)
{
IK1[0] = 0x04000000;
IK1[1] = count;
IK1[2] = 0x04000000;
IK1[3] = count;
}
byte[] str = new byte[7] {
0x15, 0x01, 0x00, 0x01, 0x01, 0x00, 0x01
};
Knas1 = kdf.kdf_decode(Kasme, str);
Array.Copy(Knas1, 16, Knas, 0, 16); //获得Knas
nasPlain = eea1.snow(nasPlain, Knas, IK1); //解析出明文
#endregion
}
else if (algorithm == 2)//加密算法选择EEA2，即AES，下面的解密方法具体见EEA2和KDF算法的介绍
{
#region
byte[] count1 = new byte[4];
count1 = uintToBytes(count);
byte[] diret = new byte[4];//用于表示direction部分
byte[] IK = new byte[16];
//EEA2的IK与EEA1不同
if (direction == 0)
{
diret[0] = 0;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
if (direction == 1)
{
diret[0] = 0x04;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
Array.Copy(count1, 0, IK, 0, 4);
Array.Copy(diret, 0, IK, 4, 4);
byte[] str = new byte[7] {
0x15, 0x01, 0x00, 0x01, 0x02, 0x00, 0x01
};
Knas1 = kdf.kdf_decode(Kasme, str);
Array.Copy(Knas1, 16, Knas, 0, 16); //获得Knas
nasPlain = eea2.aes(nasPlain, Knas, IK); //解析明文
#endregion
}
else if (algorithm == 3)//加密算法选择EEA2，即ZUC，下面的解密方法具体见EEA3和KDF算法的介绍
{
#region
byte[] count1 = new byte[4];
count1 = uintToBytes(count);
byte[] diret = new byte[4];//用于表示direction部分
byte[] IK = new byte[32];
if (direction == 0)
{
diret[0] = 0;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
if (direction == 1)
{
diret[0] = 0x04;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
//注意三种算法的IK计算方法不同（程序中的算法有待实际验证）
Array.Copy(diret, 0, IK, 0, 4);
Array.Copy(count1, 0, IK, 4, 4);
Array.Copy(diret, 0, IK, 8, 4);
Array.Copy(count1, 0, IK, 12, 4);
byte[] str = new byte[7] {
0x15, 0x01, 0x00, 0x01, 0x03, 0x00, 0x01
};
Knas1 = kdf.kdf_decode(Kasme, str);
Array.Copy(Knas1, 16, Knas, 0, 16);//获得Knas
nasPlain = eea3.zuc(nasPlain, Knas, IK);
#endregion
}
plain(nasPlain);
IndexCause = cause1.Index;
LengthCause = cause1.Length;
cause_str = cause1.NasCause(nasPlain);
}
else//没有从S6a口获得密钥
{
identity = "";
cause_str = "";
ue_ip = "";
EsmMessage = "ciperd message";
}
}
#endregion
}
else if (headType == 3)//只进行保证性保护
{
#region
down_sqn = 0;
down_overflow = 0;
count = (uint)(down_overflow << 8 | down_sqn);
cause_str = cause1.NasCause(nasPlain);
plain(nasPlain);
IndexCause = cause1.Index;
LengthCause = cause1.Length;
#endregion
}
else if (headType == 4)//使用新的安全上下文中的KASME加密，故在这里需要更新加密密钥
{
#region
up_sqn = 0;
up_overflow = 0;
count = (uint)(up_overflow << 8 | up_sqn);
if ((header == 0x07) || (ciper_or == true))//虽然安全头类型为4，但是不加密
{
plain(nasPlain);
cause_str = cause1.NasCause(nasPlain);
IndexCause = cause1.Index;
LengthCause = cause1.Length;
}
else
//解密模块，注意三种算法的IK是不同的
{
//只有需要解密时，才能更改或获得Kasme，因为即使headType==2,4也不一定会加密，也与加密开关有关系
Kasme_i++;//当headertype==4时，要更新Kasme
if (Kasme_1.Count > 0)
{
Kasme = Kasme_1[Kasme_i];//在此处获得Kasme数组中合适的Kasme
#region
if (algorithm == 1)
{
#region
UInt32[] IK1 = new UInt32[4];//存放解密所需的IK值（count，方向，identity组成）
if (direction == 0)
{
IK1[0] = 0;
IK1[1] = count;
IK1[2] = 0;
IK1[3] = count;
}
if (direction == 1)
{
IK1[0] = 0x04000000;
IK1[1] = count;
IK1[2] = 0x04000000;
IK1[3] = count;
}
byte[] str = new byte[7] {
0x15, 0x01, 0x00, 0x01, 0x01, 0x00, 0x01
};
Knas1 = kdf.kdf_decode(Kasme, str);
Array.Copy(Knas1, 16, Knas, 0, 16); //获得Knas
nasPlain = eea1.snow(nasPlain, Knas, IK1); //解析出明文
#endregion
}
else if (algorithm == 2)
{
#region
byte[] count1 = new byte[4];
count1 = uintToBytes(count);
byte[] diret = new byte[4];//用于表示direction部分
byte[] IK = new byte[16];
//EEA2的IK与EEA1不同
if (direction == 0)
{
diret[0] = 0;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
if (direction == 1)
{
diret[0] = 0x04;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
Array.Copy(count1, 0, IK, 0, 4);
Array.Copy(diret, 0, IK, 4, 4);
byte[] str = new byte[7] {
0x15, 0x01, 0x00, 0x01, 0x02, 0x00, 0x01
};
Knas1 = kdf.kdf_decode(Kasme, str);
Array.Copy(Knas1, 16, Knas, 0, 16); //获得Knas
nasPlain = eea2.aes(nasPlain, Knas, IK); //解析明文
#endregion
}
else if (algorithm == 3)
{
#region
byte[] count1 = new byte[4];
count1 = uintToBytes(count);
byte[] diret = new byte[4];//用于表示direction部分
byte[] IK = new byte[32];
if (direction == 0)
{
diret[0] = 0;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
if (direction == 1)
{
diret[0] = 0x04;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
//注意三种算法的IK计算方法不同（程序中的算法有待实际验证）
Array.Copy(diret, 0, IK, 0, 4);
Array.Copy(count1, 0, IK, 4, 4);
Array.Copy(diret, 0, IK, 8, 4);
Array.Copy(count1, 0, IK, 12, 4);
byte[] str = new byte[7] {
0x15, 0x01, 0x00, 0x01, 0x03, 0x00, 0x01
};
Knas1 = kdf.kdf_decode(Kasme, str);
Array.Copy(Knas1, 16, Knas, 0, 16);//获得Knas
nasPlain = eea3.zuc(nasPlain, Knas, IK);
#endregion
}
//decrypt2();//解密函数（密钥更新）
#endregion
plain(nasPlain);
cause_str = cause1.NasCause(nasPlain);
IndexCause = cause1.Index;
LengthCause = cause1.Length;
}
else //没有从S6a口获得密钥
{
identity = "";
cause_str = "";
ue_ip = "";
EsmMessage = "ciperd message";
}
}
#endregion
}
//因为此处还要包括安全头部的6字节
IndexEsm = IndexEsm + 6;
IndexEmm = IndexEmm + 6;
IndexCause = IndexCause + 6;
IndexIP = IndexIP + 6;
IndexIdentity = IndexIdentity + 6;
}
else if (headType == 0)//不加密，也不进行完整性保护
{
plain(nas_pdu);
cause_str = cause1.NasCause(nas_pdu);
}
else //此处表示其余的情况全部视为service request
{
#region
sqn = (byte)(nas_pdu[1] & 0x1f);//service request 的序列号获取
if (direction == 0)
{
down_sqn = sqn;
if (System.Math.Abs(down_sqn - re_down_sqn) >= 128)
{
down_overflow++;
}
re_down_sqn = down_sqn;
count = (uint)(down_overflow << 8 | down_sqn);//把溢出值与序列号拼接
}
if (direction == 1)
{
up_sqn = sqn;
if (System.Math.Abs(up_sqn - re_up_sqn) >= 128)
{
down_overflow++;
}
re_up_sqn = up_sqn;
count = (uint)(up_overflow << 8 | up_sqn);
}
IndexEsm = 0;
LengthEmm = 1;
EsmMessage = "service request";
esmType = 255;//由于service request既不是EMM消息也不是ESM消息，故没有其编号，暂定为255.
#endregion
}
}
public void decrypt(byte[] nas_pdu, int direction, List <byte[]> kasme)//数组nas_pdu 是nas数据流
{
cause_str = "";
byte proDiscriminator = 0, EBI = 0;
byte headType1 = 0, headType = 0;
byte sqn = 0;
byte header = 0;
bool ciper_or = false;
byte down_sqn = 0, up_sqn = 0;
uint count = 0;
List <byte[]> Kasme1 = new List <byte[]>();
byte[] Kasme = new byte[32];
byte[] Knas1 = new byte[32];
byte[] Knas = new byte[16];
proDiscriminator = (byte)(nas_pdu[0] & 0x0f);
if (proDiscriminator == 0x07)
{
headType1 = (byte)((nas_pdu[0] & 0xf0) >> 4);
}
else if (proDiscriminator == 0x02)
{
EBI = (byte)((nas_pdu[0] & 0xf0) >> 4);
}
//用于判断security header Type=2,4时，加密开关是否关闭，若关闭，则不需要进行解密。
if ((headType1 == 1) || (headType1 == 2) || (headType1 == 3) || (headType1 == 4)) //当headerType=1，2，3，4时才有nasPlain,sqn,header,ciper_or.
{
byte[] nasPlain = new byte[nas_pdu.Length - 6]; //nasPlain表示加密的nas部分，但是这只适宜于headertype=1,2,3,4的情况，不适于type=0.
sqn = nas_pdu[5]; //获得每条信令的序列号(对于service request有特殊情况，该表达式不是其序列号，故需要单独处理)
Array.Copy(nas_pdu, 6, nasPlain, 0, nasPlain.Length);
header = nasPlain[0];
ciper_or = field(header);
if (headType1 == 1)
{
#region
if (direction == 0)
{
down_sqn = sqn;
if (System.Math.Abs(down_sqn - re_down_sqn) >= 128)
{
down_overflow++;
}
re_down_sqn = down_sqn;
count = (uint)(down_overflow << 8 | down_sqn);//把溢出值与序列号拼接
}
if (direction == 1)
{
up_sqn = sqn;
if (System.Math.Abs(up_sqn - re_up_sqn) >= 128)
{
down_overflow++;
}
re_up_sqn = up_sqn;
count = (uint)(up_overflow << 8 | up_sqn);
}
cause_str = cause1.NasCause(nasPlain);
plain(nasPlain);
#endregion
}
else if (headType1 == 2)
{
#region
if (direction == 0)
{
down_sqn = sqn;
if (System.Math.Abs(down_sqn - re_down_sqn) >= 128)
{
down_overflow++;
}
re_down_sqn = down_sqn;
count = (uint)(down_overflow << 8 | down_sqn);//把溢出值与序列号拼接
}
if (direction == 1)
{
up_sqn = sqn;
if (System.Math.Abs(up_sqn - re_up_sqn) >= 128)
{
down_overflow++;
}
re_up_sqn = up_sqn;
count = (uint)(up_overflow << 8 | up_sqn);
}
if ((header == 0x07) || (ciper_or == true))//虽然安全头类型为2，但是不加密
{
plain(nasPlain);
}
else
{
if (kasme.Count > 0)
{
//Kasme1 = convert(Kasme_1);//将string的Kasme转为byte数组
Kasme = kasme[MainForm.kasmeCount];//在此处获得Kasme数组中合适的Kasme
//解密模块，注意三种算法的IK是不同的
if (algorithm == 1)
{
#region
UInt32[] IK1 = new UInt32[4];//存放解密所需的IK值（count，方向，identity组成）
if (direction == 0)
{
IK1[0] = 0;
IK1[1] = count;
IK1[2] = 0;
IK1[3] = count;
}
if (direction == 1)
{
IK1[0] = 0x04000000;
IK1[1] = count;
IK1[2] = 0x04000000;
IK1[3] = count;
}
byte[] str = new byte[7] {
0x15, 0x01, 0x00, 0x01, 0x01, 0x00, 0x01
};
Knas1 = kdf.kdf_decode(Kasme, str);
Array.Copy(Knas1, 16, Knas, 0, 16); //获得Knas
nasPlain = eea1.snow(nasPlain, Knas, IK1); //解析出明文
#endregion
}
else if (algorithm == 2)
{
#region
byte[] count1 = new byte[4];
count1 = uintToBytes(count);
byte[] diret = new byte[4];//用于表示direction部分
byte[] IK = new byte[16];
//EEA2的IK与EEA1不同
if (direction == 0)
{
diret[0] = 0;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
if (direction == 1)
{
diret[0] = 0x04;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
Array.Copy(count1, 0, IK, 0, 4);
Array.Copy(diret, 0, IK, 4, 4);
byte[] str = new byte[7] {
0x15, 0x01, 0x00, 0x01, 0x02, 0x00, 0x01
};
Knas1 = kdf.kdf_decode(Kasme, str);
Array.Copy(Knas1, 16, Knas, 0, 16); //获得Knas
nasPlain = eea2.aes(nasPlain, Knas, IK); //解析明文
#endregion
}
else if (algorithm == 3)
{
#region
byte[] count1 = new byte[4];
count1 = uintToBytes(count);
byte[] diret = new byte[4];//用于表示direction部分
byte[] IK = new byte[32];
if (direction == 0)
{
diret[0] = 0;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
if (direction == 1)
{
diret[0] = 0x04;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
//注意三种算法的IK计算方法不同（程序中的算法有待实际验证）
Array.Copy(diret, 0, IK, 0, 4);
Array.Copy(count1, 0, IK, 4, 4);
Array.Copy(diret, 0, IK, 8, 4);
Array.Copy(count1, 0, IK, 12, 4);
byte[] str = new byte[7] {
0x15, 0x01, 0x00, 0x01, 0x03, 0x00, 0x01
};
Knas1 = kdf.kdf_decode(Kasme, str);
Array.Copy(Knas1, 16, Knas, 0, 16);//获得Knas
nasPlain = eea3.zuc(nasPlain, Knas, IK);
#endregion
}
plain(nasPlain);
cause_str = cause1.NasCause(nasPlain);
}
else//没有获得密钥
{
identity = "";
cause_str = "";
ue_ip = "";
str2 = "ciperd message";
}
}
#endregion
}
else if (headType1 == 3)
{
#region
down_sqn = 0;
down_overflow = 0;
count = (uint)(down_overflow << 8 | down_sqn);
cause_str = cause1.NasCause(nasPlain);
plain(nasPlain);
#endregion
}
else if (headType1 == 4)
{
#region
up_sqn = 0;
up_overflow = 0;
count = (uint)(up_overflow << 8 | up_sqn);
if ((header == 0x07) || (ciper_or == true))//虽然安全头类型为4，但是不加密
{
plain(nasPlain);
}
else
//解密模块，注意三种算法的IK是不同的
{
//只有需要解密时，才能更改或获得Kasme，因为即使headType==2,4也不一定会加密，也与加密开关有关系
MainForm.kasmeCount++;//当headertype==4时，要更新Kasme
if (kasme.Count > 0)
{
//Kasme1 = convert(Kasme_1);//将string的Kasme转为byte数组
Kasme = kasme[MainForm.kasmeCount];//在此处获得Kasme数组中合适的Kasme
#region
if (algorithm == 1)
{
#region
UInt32[] IK1 = new UInt32[4];//存放解密所需的IK值（count，方向，identity组成）
if (direction == 0)
{
IK1[0] = 0;
IK1[1] = count;
IK1[2] = 0;
IK1[3] = count;
}
if (direction == 1)
{
IK1[0] = 0x04000000;
IK1[1] = count;
IK1[2] = 0x04000000;
IK1[3] = count;
}
byte[] str = new byte[7] {
0x15, 0x01, 0x00, 0x01, 0x01, 0x00, 0x01
};
Knas1 = kdf.kdf_decode(Kasme, str);
Array.Copy(Knas1, 16, Knas, 0, 16); //获得Knas
nasPlain = eea1.snow(nasPlain, Knas, IK1); //解析出明文
#endregion
}
else if (algorithm == 2)
{
#region
byte[] count1 = new byte[4];
count1 = uintToBytes(count);
byte[] diret = new byte[4];//用于表示direction部分
byte[] IK = new byte[16];
//EEA2的IK与EEA1不同
if (direction == 0)
{
diret[0] = 0;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
if (direction == 1)
{
diret[0] = 0x04;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
Array.Copy(count1, 0, IK, 0, 4);
Array.Copy(diret, 0, IK, 4, 4);
byte[] str = new byte[7] {
0x15, 0x01, 0x00, 0x01, 0x02, 0x00, 0x01
};
Knas1 = kdf.kdf_decode(Kasme, str);
Array.Copy(Knas1, 16, Knas, 0, 16); //获得Knas
nasPlain = eea2.aes(nasPlain, Knas, IK); //解析明文
#endregion
}
else if (algorithm == 3)
{
#region
byte[] count1 = new byte[4];
count1 = uintToBytes(count);
byte[] diret = new byte[4];//用于表示direction部分
byte[] IK = new byte[32];
if (direction == 0)
{
diret[0] = 0;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
if (direction == 1)
{
diret[0] = 0x04;
diret[1] = 0;
diret[2] = 0;
diret[3] = 0;
}
//注意三种算法的IK计算方法不同（程序中的算法有待实际验证）
Array.Copy(diret, 0, IK, 0, 4);
Array.Copy(count1, 0, IK, 4, 4);
Array.Copy(diret, 0, IK, 8, 4);
Array.Copy(count1, 0, IK, 12, 4);
byte[] str = new byte[7] {
0x15, 0x01, 0x00, 0x01, 0x03, 0x00, 0x01
};
Knas1 = kdf.kdf_decode(Kasme, str);
Array.Copy(Knas1, 16, Knas, 0, 16);//获得Knas
nasPlain = eea3.zuc(nasPlain, Knas, IK);
#endregion
}
//decrypt2();//解密函数（密钥更新）
#endregion
plain(nasPlain);
cause_str = cause1.NasCause(nasPlain);
}
else //没有从S6a口获得密钥
{
identity = "";
cause_str = "";
ue_ip = "";
str2 = "ciperd message";
}
}
#endregion
}
}
else if (headType1 == 0) //不加密
{
plain(nas_pdu); //注意函数中的参数是nas_pdu，与上面的nasPlain不同
cause_str = cause1.NasCause(nas_pdu);
}
else //此处表示其余的情况全部视为service request
{
#region
sqn = (byte)(nas_pdu[1] & 0x1f);//service request 的序列号获取
if (direction == 0)
{
down_sqn = sqn;
if (System.Math.Abs(down_sqn - re_down_sqn) >= 128)
{
down_overflow++;
}
re_down_sqn = down_sqn;
count = (uint)(down_overflow << 8 | down_sqn);//把溢出值与序列号拼接
}
if (direction == 1)
{
up_sqn = sqn;
if (System.Math.Abs(up_sqn - re_up_sqn) >= 128)
{
down_overflow++;
}
re_up_sqn = up_sqn;
count = (uint)(up_overflow << 8 | up_sqn);
}
str2 = "service request";
esmType = 255;//由于service request既不是EMM消息也不是ESM消息，故没有其编号，暂定为255.
#endregion
}
}
