pub fn ct_increment(v: &mut [u8])Expand description
V = (V + 1) mod 2^(8·V.len()), big-endian, in place — the CTR_DRBG
counter increment (SP 800-90A §10.2.1.2, the V = (V + 1) mod 2^blocklen
of the Update, and the generate loop of §10.2.1.5.2).
Constant time in V’s contents: the carry ripples through every byte
regardless of value (no early break once carry == 0), so the timing
does not reveal how many trailing 0xff bytes V had.