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extern crate libc;
use libc::{c_int, c_ulonglong};
use std::marker::PhantomData;
#[link(name="sodium")]
extern "C" {
fn sodium_init() -> c_int;
fn crypto_sign_keypair(pk: *mut u8, sk: *mut u8) -> c_int;
fn crypto_sign_detached(sig: *mut u8, siglen: *mut c_ulonglong, m: *const u8, mlen: c_ulonglong, sk: *const u8) -> c_int;
fn crypto_sign_verify_detached(sig: *const u8, m: *const u8, mlen: c_ulonglong, pk: *const u8) -> c_int;
fn crypto_scalarmult_curve25519_base(q: *mut u8, n: *const u8) -> c_int;
fn crypto_scalarmult_curve25519(q: *mut u8, n: *const u8, p: *const u8) -> c_int;
fn crypto_stream_chacha20_xor(c: *mut u8, m: *const u8, mlen: c_ulonglong, n: *const u8, k: *const u8) -> c_int;
fn crypto_stream_chacha20_xor_ic(c: *mut u8, m: *const u8, mlen: c_ulonglong, n: *const u8, ic: u64, k: *const u8) -> c_int;
fn crypto_onetimeauth(out: *mut u8, in_: *const u8, inlen: c_ulonglong, k: *const u8) -> c_int;
fn crypto_onetimeauth_verify(h: *const u8, in_: *const u8, inlen: c_ulonglong, k: *const u8) -> c_int;
}
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub struct Sodium(PhantomData<()>);
unsafe impl Send for Sodium{}
unsafe impl Sync for Sodium{}
impl Sodium {
pub fn new() -> Self {
unsafe { sodium_init(); }
Sodium(PhantomData)
}
}
pub mod chacha20 {
use super::*;
pub const NONCE_BYTES: usize = 8;
pub const KEY_BYTES: usize = 32;
pub struct Nonce(pub [u8; NONCE_BYTES]);
pub struct Key(pub [u8; KEY_BYTES]);
impl Sodium {
pub fn chacha20_xor(&self, c: &mut [u8], n: &Nonce, k: &Key) {
unsafe {
crypto_stream_chacha20_xor(c.as_mut_ptr(), c.as_ptr(), c.len() as c_ulonglong, n.0.as_ptr(), k.0.as_ptr());
}
}
pub fn chacha20_xor_ic(&self, c: &mut [u8], n: &Nonce, ic: u64, k: &Key) {
unsafe {
crypto_stream_chacha20_xor_ic(c.as_mut_ptr(), c.as_ptr(), c.len() as c_ulonglong, n.0.as_ptr(), ic, k.0.as_ptr());
}
}
}
}
pub mod poly1305 {
use super::*;
pub const KEY_BYTES: usize = 32;
pub const TAG_BYTES: usize = 16;
pub struct Key(pub [u8; KEY_BYTES]);
pub struct Tag(pub [u8; TAG_BYTES]);
impl Sodium {
pub fn poly1305_auth(&self, m: &[u8], key: &Key) -> Tag {
let mut tag = Tag([0; TAG_BYTES]);
unsafe {
crypto_onetimeauth(tag.0.as_mut_ptr(), m.as_ptr(), m.len() as c_ulonglong, key.0.as_ptr());
}
tag
}
pub fn poly1305_verify(&self, tag: &[u8], m: &[u8], key: &Key) -> bool {
if tag.len() != TAG_BYTES {
false
} else {
unsafe {
crypto_onetimeauth_verify(tag.as_ptr(), m.as_ptr(), m.len() as c_ulonglong, key.0.as_ptr()) == 0
}
}
}
}
}
pub mod ed25519 {
use super::*;
pub const PUBLICKEY_BYTES: usize = 32;
pub const SECRETKEY_BYTES: usize = 64;
pub const SIGNATURE_BYTES: usize = 64;
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct PublicKey {
pub key: [u8; PUBLICKEY_BYTES],
pub sodium: Sodium,
}
impl PublicKey {
pub fn new_zeroed() -> Self {
PublicKey { key: [0; PUBLICKEY_BYTES], sodium: Sodium::new() }
}
}
pub struct SecretKey {
pub key: [u8; SECRETKEY_BYTES],
pub sodium: Sodium,
}
impl SecretKey {
pub fn new_zeroed() -> Self {
SecretKey { key: [0; SECRETKEY_BYTES], sodium: Sodium::new() }
}
}
pub struct Signature(pub [u8; SIGNATURE_BYTES]);
pub fn keypair() -> (PublicKey, SecretKey) {
unsafe {
let sodium = Sodium::new();
let mut pk = PublicKey { key: [0; PUBLICKEY_BYTES], sodium };
let mut sk = SecretKey { key: [0; SECRETKEY_BYTES], sodium };
crypto_sign_keypair(pk.key.as_mut_ptr(), sk.key.as_mut_ptr());
(pk, sk)
}
}
pub fn verify_detached(sig: &[u8], m: &[u8], pk: &PublicKey) -> bool {
if sig.len() == SIGNATURE_BYTES {
unsafe {
crypto_sign_verify_detached(sig.as_ptr(), m.as_ptr(), m.len() as c_ulonglong, pk.key.as_ptr()) == 0
}
} else {
false
}
}
pub fn sign_detached(m: &[u8], sk: &SecretKey) -> Signature {
let mut sig = Signature([0; SIGNATURE_BYTES]);
let mut sig_len = 0;
unsafe {
crypto_sign_detached(
sig.0.as_mut_ptr(), &mut sig_len,
m.as_ptr(), m.len() as c_ulonglong,
sk.key.as_ptr()
);
}
sig
}
}
pub mod scalarmult {
use super::*;
pub const BYTES: usize = 32;
#[derive(Debug)]
pub struct Scalar(pub [u8; BYTES]);
#[derive(Debug)]
pub struct GroupElement(pub [u8; BYTES]);
impl Sodium {
pub fn scalarmult_base(&self, n: &Scalar) -> GroupElement{
let mut q = GroupElement([0; BYTES]);
unsafe {
crypto_scalarmult_curve25519_base(q.0.as_mut_ptr(), n.0.as_ptr());
}
q
}
pub fn scalarmult(&self, n: &Scalar, p: &GroupElement) -> GroupElement {
let mut q = GroupElement([0; BYTES]);
unsafe {
crypto_scalarmult_curve25519(q.0.as_mut_ptr(), n.0.as_ptr(), p.0.as_ptr());
}
q
}
}
}