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keypair.rs
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keypair.rs
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//! # Public/secret keypair tools
//!
//! Provides an implementation for handling public/private keypairs based on
//! libsodium's crypto_box, which uses X25519.
//!
//! Refer to the [protected] mod for details on usage with protected memory.
#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};
use subtle::ConstantTimeEq;
use zeroize::{Zeroize, ZeroizeOnDrop};
use crate::classic::crypto_box::crypto_box_seed_keypair_inplace;
use crate::constants::{
CRYPTO_BOX_PUBLICKEYBYTES, CRYPTO_BOX_SECRETKEYBYTES, CRYPTO_KX_SESSIONKEYBYTES,
};
use crate::error::Error;
use crate::kx;
use crate::types::*;
/// Stack-allocated public key type alias.
pub type PublicKey = StackByteArray<CRYPTO_BOX_PUBLICKEYBYTES>;
/// Stack-allocated secret key type alias.
pub type SecretKey = StackByteArray<CRYPTO_BOX_SECRETKEYBYTES>;
/// Stack-allocated key pair type alias.
pub type StackKeyPair = KeyPair<PublicKey, SecretKey>;
#[cfg_attr(
feature = "serde",
derive(Zeroize, ZeroizeOnDrop, Serialize, Deserialize, Debug, Clone)
)]
#[cfg_attr(not(feature = "serde"), derive(Zeroize, ZeroizeOnDrop, Debug, Clone))]
/// Public/private keypair for use with [`crate::dryocbox::DryocBox`], aka
/// libsodium box
pub struct KeyPair<
PublicKey: ByteArray<CRYPTO_BOX_PUBLICKEYBYTES> + Zeroize,
SecretKey: ByteArray<CRYPTO_BOX_SECRETKEYBYTES> + Zeroize,
> {
/// Public key
pub public_key: PublicKey,
/// Secret key
pub secret_key: SecretKey,
}
impl<
PublicKey: NewByteArray<CRYPTO_BOX_PUBLICKEYBYTES> + Zeroize,
SecretKey: NewByteArray<CRYPTO_BOX_SECRETKEYBYTES> + Zeroize,
> KeyPair<PublicKey, SecretKey>
{
/// Creates a new, empty keypair.
pub fn new() -> Self {
Self {
public_key: PublicKey::new_byte_array(),
secret_key: SecretKey::new_byte_array(),
}
}
/// Generates a random keypair.
pub fn gen() -> Self {
use crate::classic::crypto_box::crypto_box_keypair_inplace;
let mut public_key = PublicKey::new_byte_array();
let mut secret_key = SecretKey::new_byte_array();
crypto_box_keypair_inplace(public_key.as_mut_array(), secret_key.as_mut_array());
Self {
public_key,
secret_key,
}
}
/// Derives a keypair from `secret_key`, and consumes it, and returns a new
/// keypair.
pub fn from_secret_key(secret_key: SecretKey) -> Self {
use crate::classic::crypto_core::crypto_scalarmult_base;
let mut public_key = PublicKey::new_byte_array();
crypto_scalarmult_base(public_key.as_mut_array(), secret_key.as_array());
Self {
public_key,
secret_key,
}
}
/// Derives a keypair from `seed`, returning
/// a new keypair.
pub fn from_seed<Seed: Bytes>(seed: &Seed) -> Self {
let mut public_key = PublicKey::new_byte_array();
let mut secret_key = SecretKey::new_byte_array();
crypto_box_seed_keypair_inplace(
public_key.as_mut_array(),
secret_key.as_mut_array(),
seed.as_slice(),
);
Self {
public_key,
secret_key,
}
}
}
impl KeyPair<StackByteArray<CRYPTO_BOX_PUBLICKEYBYTES>, StackByteArray<CRYPTO_BOX_SECRETKEYBYTES>> {
/// Randomly generates a new keypair, using default types
/// (stack-allocated byte arrays). Provided for convenience.
pub fn gen_with_defaults() -> Self {
Self::gen()
}
}
impl<
'a,
PublicKey: ByteArray<CRYPTO_BOX_PUBLICKEYBYTES> + std::convert::TryFrom<&'a [u8]> + Zeroize,
SecretKey: ByteArray<CRYPTO_BOX_SECRETKEYBYTES> + std::convert::TryFrom<&'a [u8]> + Zeroize,
> KeyPair<PublicKey, SecretKey>
{
/// Constructs a new keypair from key slices, consuming them. Does not check
/// validity or authenticity of keypair.
pub fn from_slices(public_key: &'a [u8], secret_key: &'a [u8]) -> Result<Self, Error> {
Ok(Self {
public_key: PublicKey::try_from(public_key)
.map_err(|_e| dryoc_error!("invalid public key"))?,
secret_key: SecretKey::try_from(secret_key)
.map_err(|_e| dryoc_error!("invalid secret key"))?,
})
}
}
impl<
PublicKey: ByteArray<CRYPTO_BOX_PUBLICKEYBYTES> + Zeroize,
SecretKey: ByteArray<CRYPTO_BOX_SECRETKEYBYTES> + Zeroize,
> KeyPair<PublicKey, SecretKey>
{
/// Creates new client session keys using this keypair and
/// `server_public_key`, assuming this keypair is for the client.
pub fn kx_new_client_session<SessionKey: NewByteArray<CRYPTO_KX_SESSIONKEYBYTES> + Zeroize>(
&self,
server_public_key: &PublicKey,
) -> Result<kx::Session<SessionKey>, Error> {
kx::Session::new_client(self, server_public_key)
}
/// Creates new server session keys using this keypair and
/// `client_public_key`, assuming this keypair is for the server.
pub fn kx_new_server_session<SessionKey: NewByteArray<CRYPTO_KX_SESSIONKEYBYTES> + Zeroize>(
&self,
client_public_key: &PublicKey,
) -> Result<kx::Session<SessionKey>, Error> {
kx::Session::new_server(self, client_public_key)
}
}
impl<
PublicKey: NewByteArray<CRYPTO_BOX_PUBLICKEYBYTES> + Zeroize,
SecretKey: NewByteArray<CRYPTO_BOX_SECRETKEYBYTES> + Zeroize,
> Default for KeyPair<PublicKey, SecretKey>
{
fn default() -> Self {
Self::new()
}
}
#[cfg(any(feature = "nightly", all(doc, not(doctest))))]
#[cfg_attr(all(feature = "nightly", doc), doc(cfg(feature = "nightly")))]
pub mod protected {
//! # Protected memory for [`KeyPair`]
use super::*;
use crate::classic::crypto_box::crypto_box_keypair_inplace;
pub use crate::protected::*;
impl
KeyPair<
Locked<HeapByteArray<CRYPTO_BOX_PUBLICKEYBYTES>>,
Locked<HeapByteArray<CRYPTO_BOX_SECRETKEYBYTES>>,
>
{
/// Returns a new locked keypair.
pub fn new_locked_keypair() -> Result<Self, std::io::Error> {
Ok(Self {
public_key: HeapByteArray::<CRYPTO_BOX_PUBLICKEYBYTES>::new_locked()?,
secret_key: HeapByteArray::<CRYPTO_BOX_SECRETKEYBYTES>::new_locked()?,
})
}
/// Returns a new randomly generated locked keypair.
pub fn gen_locked_keypair() -> Result<Self, std::io::Error> {
let mut res = Self::new_locked_keypair()?;
crypto_box_keypair_inplace(
res.public_key.as_mut_array(),
res.secret_key.as_mut_array(),
);
Ok(res)
}
}
impl
KeyPair<
LockedRO<HeapByteArray<CRYPTO_BOX_PUBLICKEYBYTES>>,
LockedRO<HeapByteArray<CRYPTO_BOX_SECRETKEYBYTES>>,
>
{
/// Returns a new randomly generated locked, read-only keypair.
pub fn gen_readonly_locked_keypair() -> Result<Self, std::io::Error> {
let mut public_key = HeapByteArray::<CRYPTO_BOX_PUBLICKEYBYTES>::new_locked()?;
let mut secret_key = HeapByteArray::<CRYPTO_BOX_SECRETKEYBYTES>::new_locked()?;
crypto_box_keypair_inplace(public_key.as_mut_array(), secret_key.as_mut_array());
let public_key = public_key.mprotect_readonly()?;
let secret_key = secret_key.mprotect_readonly()?;
Ok(Self {
public_key,
secret_key,
})
}
}
}
impl<
PublicKey: ByteArray<CRYPTO_BOX_PUBLICKEYBYTES> + Zeroize,
SecretKey: ByteArray<CRYPTO_BOX_SECRETKEYBYTES> + Zeroize,
> PartialEq<KeyPair<PublicKey, SecretKey>> for KeyPair<PublicKey, SecretKey>
{
fn eq(&self, other: &Self) -> bool {
self.public_key
.as_slice()
.ct_eq(other.public_key.as_slice())
.unwrap_u8()
== 1
&& self
.secret_key
.as_slice()
.ct_eq(other.secret_key.as_slice())
.unwrap_u8()
== 1
}
}
#[cfg(test)]
mod tests {
use super::*;
fn all_eq<T>(t: &[T], v: T) -> bool
where
T: PartialEq,
{
t.iter().all(|x| *x == v)
}
#[test]
fn test_new() {
let keypair = KeyPair::<
StackByteArray<CRYPTO_BOX_PUBLICKEYBYTES>,
StackByteArray<CRYPTO_BOX_SECRETKEYBYTES>,
>::new();
assert!(all_eq(&keypair.public_key, 0));
assert!(all_eq(&keypair.secret_key, 0));
}
#[test]
fn test_default() {
let keypair = KeyPair::<
StackByteArray<CRYPTO_BOX_PUBLICKEYBYTES>,
StackByteArray<CRYPTO_BOX_SECRETKEYBYTES>,
>::default();
assert!(all_eq(&keypair.public_key, 0));
assert!(all_eq(&keypair.secret_key, 0));
}
#[test]
fn test_gen_keypair() {
use sodiumoxide::crypto::scalarmult::curve25519::{scalarmult_base, Scalar};
use crate::classic::crypto_core::crypto_scalarmult_base;
let keypair = KeyPair::<
StackByteArray<CRYPTO_BOX_PUBLICKEYBYTES>,
StackByteArray<CRYPTO_BOX_SECRETKEYBYTES>,
>::gen();
let mut public_key = [0u8; CRYPTO_BOX_PUBLICKEYBYTES];
crypto_scalarmult_base(&mut public_key, keypair.secret_key.as_array());
assert_eq!(keypair.public_key.as_array(), &public_key);
let ge = scalarmult_base(&Scalar::from_slice(&keypair.secret_key).unwrap());
assert_eq!(ge.as_ref(), public_key);
}
#[test]
fn test_from_secret_key() {
let keypair_1 = KeyPair::<
StackByteArray<CRYPTO_BOX_PUBLICKEYBYTES>,
StackByteArray<CRYPTO_BOX_SECRETKEYBYTES>,
>::gen();
let keypair_2 = KeyPair::from_secret_key(keypair_1.secret_key.clone());
assert_eq!(keypair_1.public_key, keypair_2.public_key);
}
}