/// <summary>
/// Adds a file to the file list
/// </summary>
/// <param name="userFile">file to add</param>
internal void Add(UserFile userFile)
{
if (Crypto.VerifySignature(userFile.HashObject(), publicKey, userFile.Signature))
{
files.Add(userFile);
}
}
/// <summary>
/// Creates a UserFile from a normal file
/// </summary>
/// <param name="input">the file to add to the User's files</param>
/// <param name="fileName">the file's name</param>
/// <returns></returns>
internal UserFile AddFile(Stream input, string fileName)
{
var data = new byte[input.Length];
var chunkList = new List<KademliaId>();
byte[] fileKey = Crypto.GenerateAesKey();
byte[] fileIV = Crypto.GenerateIV();
byte[] nameIV = Crypto.GenerateIV();
input.Read(data, 0, (int) input.Length);
data = Crypto.EncryptAes(data, fileKey, fileIV);
int finalChunkSize = data.Length % LocalObjectStorage.MaxObjectSize;
int chunks = data.Length / LocalObjectStorage.MaxObjectSize;
var chunkData = new byte[LocalObjectStorage.MaxObjectSize];
for (int i = 0; i < chunks; i++)
{
Array.Copy(data, i * LocalObjectStorage.MaxObjectSize, chunkData, 0, LocalObjectStorage.MaxObjectSize);
AddChunk(chunkList, chunkData);
}
if (finalChunkSize != 0)
{
Array.Copy(data, chunks * LocalObjectStorage.MaxObjectSize, chunkData, 0, finalChunkSize);
AddChunk(chunkList, chunkData.Take(finalChunkSize).ToArray());
}
var userFile = new UserFile {
FileId = Random.UInt64(),
ChunkList = chunkList.Select(c => c.Bytes).ToList(),
EncryptedFileName = Crypto.EncryptAes(Encoding.UTF8.GetBytes(fileName), fileKey, nameIV),
EncryptedKey = Crypto.EncryptRsa(fileKey, rsaKeyPair.Public),
FileIV = fileIV,
NameIV = nameIV,
Hash = Crypto.Hash(data)
};
userFile.Signature = Crypto.Sign(userFile.HashObject(), rsaKeyPair);
User.Add(userFile);
LocalObjectStorage.StoreObject(User, true);
return userFile;
}