public JT809GlobalConfig()
{
EncryptOptions = new JT809EncryptOptions()
{
IA1 = 20000000,
IC1 = 20000000,
M1 = 30000000
};
}
public byte[] Encrypt(ReadOnlySpan <byte> buffer, JT809EncryptOptions encryptOptions, uint privateKey)
{
byte[] data = new byte[buffer.Length];
if (0 == privateKey)
{
privateKey = 1;
}
uint mkey = encryptOptions.M1;
if (0 == mkey)
{
mkey = 1;
}
for (int idx = 0; idx < buffer.Length; idx++)
{
privateKey = encryptOptions.IA1 * (privateKey % mkey) + encryptOptions.IC1;
byte tmp = buffer[idx];
tmp ^= (byte)((privateKey >> 20) & 0xFF);
data[idx] = tmp;
}
return(data);
}
/// <summary>
/// 设置加密算法选项值
/// 不同的上下级平台之间，加密的算法是一致的，但是针对 M1, IA1, IC1 的不同。
/// 数据先经过加密而后解密。
/// </summary>
/// <param name="jT809Encrypt"></param>
/// <returns></returns>
public JT809GlobalConfig SetEncryptOptions(JT809EncryptOptions jT809EncryptOptions)
{
instance.Value.Encrypt = new JT809EncryptImpl(jT809EncryptOptions);
instance.Value.EncryptOptions = jT809EncryptOptions;
return(instance.Value);
}
public byte[] Decrypt(ReadOnlySpan <byte> buffer, JT809EncryptOptions encryptOptions, uint privateKey)
{
return(Encrypt(buffer, encryptOptions, privateKey));
}
public JT809EncryptImpl(JT809EncryptOptions jT809EncryptOptions)
{
this.jT809EncryptOptions = jT809EncryptOptions;
}
