public static String CSMMAC(String key, String data)
{
if (key.Length != 32)
{
new Exception("key's length must be 16!");
return(null);
}
StringBuilder sb = new StringBuilder(data);
int mod = data.Length % 32;
if (mod != 0)
{
for (int i = 0; i < 32 - mod; i++)
{
sb.Append("0");
}
}
String oper = sb.ToString();
int count = oper.Length / 32;
String[] blocks = new String[count];
for (int i = 0; i < count; i++)
{
blocks[i] = oper.Substring(i * 32, 32);
}
String vector = blocks[0];
//循环进行异或
for (int i = 1; i < count; i++)
{
vector = xOrString(vector, blocks[i]);
}
Console.WriteLine("vector:" + vector);
//DES加密
String left = ByteUtil.getHexStr(Encoding.Default.GetBytes(vector.Substring(0, 16)));
Console.WriteLine("left:" + left);
String right = ByteUtil.getHexStr(Encoding.Default.GetBytes(vector.Substring(16)));
Console.WriteLine("right:" + right);
left = BCDUtil.byteArrToString(CSm4.EncriptB(BCDUtil.HexStrToByteArray(key), BCDUtil.HexStrToByteArray(left)));
Console.WriteLine("加密left:" + left);
right = xOrString(left, right);
Console.WriteLine("加密后异或:" + right);
right = BCDUtil.byteArrToString(CSm4.EncriptB(BCDUtil.HexStrToByteArray(key), BCDUtil.HexStrToByteArray(right)));
Console.WriteLine("异或后加密:" + right);
return(right);
}
/// <summary>
/// 验证数据是否通过验证
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
static string validateKey(string data, string key)
{
string validata = data.Substring(data.Length - 8, 8).ToUpper();
byte[] sources = BCDUtil.HexStrToByteArray(data.Substring(0, 32));
byte[] desKeys = BCDUtil.HexStrToByteArray(key);
byte[] encSource = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
byte[] encKeys = CSm4.DecriptB(desKeys, sources);
if (PosProtocol.bytesToHexString(CSm4.EncriptB(encKeys, encSource)).Substring(0, 8).Equals(validata))
{
Console.WriteLine("密钥验证通过返回灌输密钥！！！！");
return(PosProtocol.bytesToHexString(encKeys));
}
return("");
}
