/// <summary>
/// Encrypts bytes with the specified key.
/// </summary>
public static Byte[] Encrypt(Byte[] key, Byte[] bytes)
{
Check(key, bytes);
UInt32[] k = UTILS.Pack(key);
UInt32[] v = UTILS.Pack(bytes);
if (v.Length <= 1)
{
v[1] = 0;
}
Int32 n = v.Length; Int32 q = 6 + 52 / n;
UInt32 z = v[n - 1], m, y = v[0], d = 0x9E3779B9, s = 0, e;
while (q-- > 0)
{
s = unchecked (s + d);
e = s >> 2 & 3;
for (Int32 i = 0; i < n; i++)
{
y = v[(i + 1) % n];
m = unchecked ((z >> 5 ^ y << 2) + (y >> 3 ^ z << 4) ^ (s ^ y) + (k[i & 3 ^ e] ^ z));
z = v[i] = unchecked (v[i] + m);
}
}
return(UTILS.Unpack(v));
}
/// <summary>
/// Decrypts bytes with the specified key.
/// </summary>
public static Byte[] Decrypt(Byte[] key, Byte[] bytes)
{
Check(key, bytes);
UInt32[] k = UTILS.Pack(key);
UInt32[] v = UTILS.Pack(bytes);
Int32 n = v.Length, q = 6 + 52 / n;
UInt32 z = v[n - 1], y = v[0], d = 0x9E3779B9, e;
UInt32 m, s = unchecked ((UInt32)(q * d));
while (s != 0)
{
e = s >> 2 & 3;
for (Int32 i = n - 1; i >= 0; i--)
{
z = v[i > 0 ? i - 1 : n - 1];
m = unchecked ((z >> 5 ^ y << 2) + (y >> 3 ^ z << 4) ^ (s ^ y) + (k[i & 3 ^ e] ^ z));
y = v[i] = unchecked (v[i] - m);
}
s = unchecked (s - d);
}
return(UTILS.Unpack(v));
}
