/// <summary>
/// indexer
/// </summary>
/// <param name="i"></param>
/// <returns></returns>
public byte[] this[uint i]
{
get
{
byte[] wrapped_keys = File.ReadAllBytes(PATH);
byte[] iter_bytes = new byte[4];
byte[] salt = new byte[32];
Array.Copy(wrapped_keys, 0, iter_bytes, 0, 4);
Array.Copy(wrapped_keys, 4, salt, 0, 32);
int iter = BitConverter.ToInt32(iter_bytes, 0);
byte[] outter_key = DeriveKeyFunction.PBKDF2(PASSWORD, salt, iter, 32);
byte[] enc_keys = new byte[wrapped_keys.Length - (4 + 32)];
Array.Copy(wrapped_keys, (4 + 32), enc_keys, 0, enc_keys.Length);
Cryptography <AesCryptoServiceProvider> aes = new Cryptography <AesCryptoServiceProvider>(outter_key);
byte[] denc_all_keys = aes.Decrypt(enc_keys);
byte[] key = new byte[32];
uint idx = i * 32;
Array.Copy(denc_all_keys, idx, key, 0, 32);
return(key);
}
}
/// <summary>
/// CreateStore
/// </summary>
/// <param name="path">path to store</param>
/// <param name="passowrd">password</param>
/// <param name="key">keys</param>
public static void CreateStore(string path, string passowrd, params byte[][] key)
{
byte[] key_data = new byte[key.Length * key_size];
// pack all keys in an byte[]
for (int i = 0; i < key.Length; ++i)
{
Array.Copy(key[i], 0, key_data, i * 32, (int)key_size);
}
// enc with aes
byte[] dk = DeriveKeyFunction.DeriveKey(passowrd);
byte[] iter_bytes = new byte[4];
byte[] salt = new byte[32];
byte[] kek = new byte[32];
// copy values
Array.Copy(dk, 0, iter_bytes, 0, 4);
Array.Copy(dk, 4, salt, 0, 32);
Array.Copy(dk, 4 + 32, kek, 0, 32);
int iters = BitConverter.ToInt32(iter_bytes, 0);
Cryptography <AesCryptoServiceProvider> aes = new Cryptography <AesCryptoServiceProvider>(kek);
//Cryptography<Aes> aes = new Cryptography<Aes>(kek);
byte[] enc_all_keys = aes.Encrypt(key_data);
byte[] iters_salt_enc_all_keys = new byte[enc_all_keys.Length + 4 + 32];
// write salt and iters to enc_all_keys
Array.Copy(iter_bytes, 0, iters_salt_enc_all_keys, 0, 4);
Array.Copy(salt, 0, iters_salt_enc_all_keys, 4, 32);
Array.Copy(enc_all_keys, 0, iters_salt_enc_all_keys, 4 + 32, enc_all_keys.Length);
if (File.Exists(path))
{
File.Delete(path);
}
// save
File.WriteAllBytes(path, iters_salt_enc_all_keys);
}
