INNER CODE UNIT · Rust

gen_word

RustCrypto/stream-ciphers · hc-256/src/lib.rs:163

    fn gen_word(&mut self) -> u32 {
        let i = self.idx as usize;
        let j = self.idx as usize & TABLE_MASK;

        self.idx = (self.idx + 1) & (2048 - 1);

        if i < 1024 {
            self.ptable[j] = self.ptable[j]
                .wrapping_add(self.ptable[j.wrapping_sub(10) & TABLE_MASK])
                .wrapping_add(self.g1(
                    self.ptable[j.wrapping_sub(3) & TABLE_MASK],
                    self.ptable[j.wrapping_sub(1023) & TABLE_MASK],
                ));

            self.h1(self.ptable[j.wrapping_sub(12) & TABLE_MASK]) ^ self.ptable[j]
        } else {
            self.qtable[j] = self.qtable[j]
                .wrapping_add(self.qtable[j.wrapping_sub(10) & TABLE_MASK])

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