pub fn g(input: &[u8]) -> ([u8; 32], [u8; 32])Expand description
G(c) — SHA3-512 hash returning two 32-byte values.
Computes SHA3-512(c) and splits the 64-byte output into two halves.
Used in FIPS 203 to derive both the shared secret and the encryption
randomness: (K, r) = G(m || H(ek)).