| public Init ( bool forEncryption, ICipherParameters parameters ) : void | ||
| forEncryption | bool | |
| parameters | ICipherParameters | |
| return | void | |
private void Initialize()
{
rijndael = new RijndaelEngine();
aesInitializationVector = new byte[CRYPTO_BLOCK_SIZE];
int rawLength = 2 * password.Length;
byte[] rawPassword = new byte[rawLength + 8];
byte[] passwordBytes = Encoding.UTF8.GetBytes(password);
for (int i = 0; i < password.Length; i++)
{
rawPassword[i * 2] = passwordBytes[i];
rawPassword[i * 2 + 1] = 0;
}
for (int i = 0; i < salt.Length; i++)
{
rawPassword[i + rawLength] = salt[i];
}
const int noOfRounds = (1 << 18);
IList<byte> bytes = new List<byte>();
byte[] digest;
//TODO slow code below, find ways to optimize
for (int i = 0; i < noOfRounds; i++)
{
bytes.AddRange(rawPassword);
bytes.AddRange(new[] { (byte)i, (byte)(i >> 8), (byte)(i >> CRYPTO_BLOCK_SIZE) });
if (i % (noOfRounds / CRYPTO_BLOCK_SIZE) == 0)
{
digest = ComputeHash(bytes.ToArray());
aesInitializationVector[i / (noOfRounds / CRYPTO_BLOCK_SIZE)] = digest[19];
}
}
digest = ComputeHash(bytes.ToArray());
//slow code ends
byte[] aesKey = new byte[CRYPTO_BLOCK_SIZE];
for (int i = 0; i < 4; i++)
for (int j = 0; j < 4; j++)
aesKey[i * 4 + j] = (byte)
(((digest[i * 4] * 0x1000000) & 0xff000000 |
(uint)((digest[i * 4 + 1] * 0x10000) & 0xff0000) |
(uint)((digest[i * 4 + 2] * 0x100) & 0xff00) |
(uint)(digest[i * 4 + 3] & 0xff)) >> (j * 8));
rijndael.Init(false, new KeyParameter(aesKey));
}
