internal DFunction(byte[] ask, bool encryption = true)
{
ArgumentThrow.IfLengthNot(ask, 16, "Only 16-bytes ASKs are valid.", nameof(ask));
this.ASK = ask;
this.encryption = encryption;
}
public static byte[] ScrambledParcel(this EncryptedCKParcel parcel, byte[] key)
{
ArgumentThrow.IfNull(parcel, $"Invalid {typeof(EncryptedCKParcel).Name} to scramble. Parcel can not be null.", nameof(parcel));
ArgumentThrow.IfLengthNot(key, 16, "Invalid key to scramble. Key buffer should be 16 bytes.", nameof(key));
using (var aes = Aes.Create())
{
// aes.IV = null;
aes.Key = key;
aes.Mode = CipherMode.ECB;
aes.Padding = PaddingMode.None;
using (var encryptor = aes.CreateEncryptor())
using (var memoryStream = new MemoryStream())
using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(parcel.Binary);
return(memoryStream.ToArray());
}
}
}
public static byte[] UnscrambledParcel(this SKR1Payload payload, byte[] key)
{
ArgumentThrow.IfNull(payload, $"Invalid {typeof(SKR1Payload).Name} to unscramble. Payload can not be null.", nameof(payload));
ArgumentThrow.IfLengthNot(key, 16, "Invalid key to unscramble. Key buffer should be 16 bytes.", nameof(key));
using (var aes = Aes.Create())
{
aes.IV = payload.IV;
aes.Key = key;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.None;
using (var decryptor = aes.CreateDecryptor())
using (var memoryStream = new MemoryStream())
using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(payload.Parcel);
return(memoryStream.ToArray());
}
}
}
public static byte[] ScrambledPayload(byte[] payload, byte[] iv, byte[] key)
{
ArgumentThrow.IfLengthNotMultiple(payload, 16, "Invalid payload to scramble. The buffer length should be multiple of 16.", nameof(payload));
ArgumentThrow.IfLengthNot(iv, 16, "Invalid key to scramble. Key buffer should be 16 bytes.", nameof(iv));
ArgumentThrow.IfLengthNot(key, 16, "Invalid key to scramble. Key buffer should be 16 bytes.", nameof(key));
using (var aes = Aes.Create())
{
aes.IV = iv;
aes.Key = key;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.None;
using (var encryptor = aes.CreateEncryptor())
using (var memoryStream = new MemoryStream())
using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(payload);
return(memoryStream.ToArray());
}
}
}