private static string Decrypt(byte[] bytes, int len, Expression exp)
{
byte[] ret = new byte[(len + 7) & ~7];
using (BinaryReader rdr = new BinaryReader(new MemoryStream(bytes)))
{
for (int i = 0; i < ret.Length; i++)
{
int r = Read7BitEncodedInt(rdr);
ret[i] = (byte)LongExpressionEvaluator.Evaluate(exp, r);
}
}
return(Encoding.Unicode.GetString(ret, 0, len));
}
private static byte[] Encrypt(byte[] bytes, Expression exp, out int len)
{
byte[] tmp = new byte[(bytes.Length + 7) & ~7];
Buffer.BlockCopy(bytes, 0, tmp, 0, bytes.Length);
len = bytes.Length;
MemoryStream ret = new MemoryStream();
using (BinaryWriter wtr = new BinaryWriter(ret))
{
for (int i = 0; i < tmp.Length; i++)
{
int en = (int)LongExpressionEvaluator.Evaluate(exp, tmp[i]);
Write7BitEncodedInt(wtr, en);
}
}
return(ret.ToArray());
}