obfs4 0.1.0-alpha.1

Pure rust implementation of the obfs4 pluggable transport
Documentation 
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pub(crate) struct FakePRNG<'a> {
    bytes: &'a [u8],
}
impl<'a> FakePRNG<'a> {
    pub(crate) fn new(bytes: &'a [u8]) -> Self {
        Self { bytes }
    }
}
impl<'a> rand_core::RngCore for FakePRNG<'a> {
    fn next_u32(&mut self) -> u32 {
        rand_core::impls::next_u32_via_fill(self)
    }
    fn next_u64(&mut self) -> u64 {
        rand_core::impls::next_u64_via_fill(self)
    }
    fn try_fill_bytes(&mut self, dest: &mut [u8]) -> std::result::Result<(), rand_core::Error> {
        self.fill_bytes(dest);
        Ok(())
    }
    fn fill_bytes(&mut self, dest: &mut [u8]) {
        // assert!(dest.len() <= self.bytes.len(), "dst:{} > have:{}", dest.len(), self.bytes.len());
        if dest.len() > self.bytes.len() {
            let mut rng = rand::thread_rng();
            rng.fill_bytes(dest);
        } else {
            dest.copy_from_slice(&self.bytes[0..dest.len()]);
            self.bytes = &self.bytes[dest.len()..];
        }
    }
}
impl rand_core::CryptoRng for FakePRNG<'_> {}