pub fn sha1rnds4(abcd: [u32; 4], msg: [u32; 4], func: u32) -> [u32; 4]Expand description
sha1rnds4(abcd, msg, func) — four rounds of SHA-1. abcd is the working state (A in lane 3 …
D in lane 0), msg the four message dwords with the round’s E already folded into its high dword
(via sha1nexte / the initial add), and func ∈ 0..=3 selects the round function + constant
(0 = Ch/K0, 1 = Parity/K1, 2 = Maj/K2, 3 = Parity/K3). Returns the new state.