poly1305: Poly1305 MAC support

This module provides the poly1305 MAC as defined in RFC 8439.

This is a low-level module which implements cryptographic primitives. Direct use of cryptographic primitives is not recommended for non-experts, as incorrect use of these primitives can easily lead to the introduction of security vulnerabilities. Non-experts are advised to use the high-level operations available in the top-level crypto:: module.

Be advised that Hare's cryptography implementations have not been audited.

type key = [32]u8;

// Undocumented types:
type state = struct {
	mac::mac,
	r: [4]u32,
	h: [5]u32,
	c: [16]u8,
	pad: [4]u32,
	cidx: size,
};

def BLOCKSZ: size = 16;
def SZ: size = 16;

fn init(p: *state, key: *key) void;
fn poly1305() state;

type key = [32]u8;

type state = struct {
	mac::mac,
	r: [4]u32,
	h: [5]u32,
	c: [16]u8,
	pad: [4]u32,
	cidx: size,
};

def BLOCKSZ: size = 16;

def SZ: size = 16;

fn init(p: *state, key: *key) void;

fn poly1305() state;