Method fill_bytes

oblivious_transfer/src/aes_prng.rs:185–205

Fills in an array of bytes with randomness

(&mut self, dest: &mut [u8])

    /// Fills in an array of bytes with randomness
    fn fill_bytes(&mut self, dest: &mut [u8]) {
        let mut read_len = STATE_SIZE - self.state.used_bytes;
        let mut dest_start = 0;

        while read_len < dest.len() {
            let src_start = self.state.used_bytes;
            dest[dest_start..read_len]
                .copy_from_slice(&self.state.as_mut_bytes()[src_start..STATE_SIZE]);
            self.next();
            dest_start = read_len;
            read_len += STATE_SIZE;
        }

        let src_start = self.state.used_bytes;
        let remainder = dest.len() - dest_start;
        let dest_len = dest.len();

        dest[dest_start..dest_len]
            .copy_from_slice(&self.state.as_mut_bytes()[src_start..src_start + remainder]);
        self.state.used_bytes += remainder;
    }

    fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
        self.fill_bytes(dest);