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|
//! Cryptographic primitives.
//!
//! This module contains cryptographic primitives as defined and used
//! by OpenPGP. It abstracts over the cryptographic library chosen at
//! compile time. Most of the time, it will not be necessary to
//! explicitly use types from this module directly, but they are used
//! in the API (e.g. [`Password`]). Advanced users may use these
//! primitives to provide custom extensions to OpenPGP.
//!
//!
//! # Common Operations
//!
//! - *Converting a string to a [`Password`]*: Use [`Password::from`].
//! - *Create a session key*: Use [`SessionKey::new`].
//! - *Use secret keys*: See the [`KeyPair` example].
//!
//! [`Password::from`]: std::convert::From
//! [`SessionKey::new`]: SessionKey::new()
//! [`KeyPair` example]: KeyPair#examples
use std::cmp::Ordering;
use std::ops::{Deref, DerefMut};
use std::fmt;
use std::borrow::Cow;
use crate::{
Error,
Result,
};
pub(crate) mod aead;
mod asymmetric;
pub use self::asymmetric::{Signer, Decryptor, KeyPair};
pub(crate) mod backend;
pub mod ecdh;
pub mod hash;
pub mod mem;
pub mod mpi;
mod s2k;
pub use s2k::S2K;
pub(crate) mod symmetric;
#[cfg(test)]
mod tests;
/// Returns a short, human-readable description of the backend.
///
/// This starts with the name of the backend, possibly a version, and
/// any optional features that are available. This is meant for
/// inclusion in version strings to improve bug reports.
pub fn backend() -> String {
use backend::interface::Backend;
backend::Backend::backend()
}
/// Fills the given buffer with random data.
///
/// Fills the given buffer with random data produced by a
/// cryptographically secure pseudorandom number generator (CSPRNG).
/// The output may be used as session keys or to derive long-term
/// cryptographic keys from. However, to create session keys,
/// consider using [`SessionKey::new`].
///
/// [`SessionKey::new`]: crate::crypto::SessionKey::new()
pub fn random<B: AsMut<[u8]>>(mut buf: B) {
use backend::interface::Backend;
backend::Backend::random(buf.as_mut()).unwrap();
}
/// Holds a session key.
///
/// The session key is cleared when dropped. Sequoia uses this type
/// to ensure that session keys are not left in memory returned to the
/// allocator.
///
/// Session keys can be generated using [`SessionKey::new`], or
/// converted from various types using [`From`].
///
/// [`SessionKey::new`]: SessionKey::new()
/// [`From`]: std::convert::From
#[derive(Clone, PartialEq, Eq)]
pub struct SessionKey(mem::Protected);
assert_send_and_sync!(SessionKey);
impl SessionKey {
/// Creates a new session key.
///
/// Creates a new session key `size` bytes in length initialized
/// using a strong cryptographic number generator.
///
/// # Examples
///
/// This creates a session key and encrypts it for a given
/// recipient key producing a [`PKESK`] packet.
///
/// [`PKESK`]: crate::packet::PKESK
///
/// ```
/// # fn main() -> sequoia_openpgp::Result<()> {
/// use sequoia_openpgp as openpgp;
/// use openpgp::types::{Curve, SymmetricAlgorithm};
/// use openpgp::crypto::SessionKey;
/// use openpgp::packet::prelude::*;
///
/// let cipher = SymmetricAlgorithm::AES256;
/// let sk = SessionKey::new(cipher.key_size().unwrap());
///
/// let key: Key<key::SecretParts, key::UnspecifiedRole> =
/// Key4::generate_ecc(false, Curve::Cv25519)?.into();
///
/// let pkesk: PKESK =
/// PKESK3::for_recipient(cipher, &sk, &key)?.into();
/// # Ok(()) }
/// ```
pub fn new(size: usize) -> Self {
let mut sk: mem::Protected = vec![0; size].into();
random(&mut sk);
Self(sk)
}
}
impl Deref for SessionKey {
type Target = [u8];
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl AsRef<[u8]> for SessionKey {
fn as_ref(&self) -> &[u8] {
&self.0
}
}
impl DerefMut for SessionKey {
fn deref_mut(&mut self) -> &mut [u8] {
&mut self.0
}
}
impl AsMut<[u8]> for SessionKey {
fn as_mut(&mut self) -> &mut [u8] {
&mut self.0
}
}
impl From<mem::Protected> for SessionKey {
fn from(v: mem::Protected) -> Self {
SessionKey(v)
}
}
impl From<Vec<u8>> for SessionKey {
fn from(v: Vec<u8>) -> Self {
SessionKey(v.into())
}
}
impl From<Box<[u8]>> for SessionKey {
fn from(v: Box<[u8]>) -> Self {
SessionKey(v.into())
}
}
impl From<&[u8]> for SessionKey {
fn from(v: &[u8]) -> Self {
Vec::from(v).into()
}
}
impl fmt::Debug for SessionKey {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "SessionKey ({:?})", self.0)
}
}
/// Holds a password.
///
/// `Password`s can be converted from various types using [`From`].
/// The password is encrypted in memory and only decrypted on demand.
/// See [`mem::Encrypted`] for details.
///
/// [`From`]: std::convert::From
///
/// # Examples
///
/// ```
/// use sequoia_openpgp as openpgp;
/// use openpgp::crypto::Password;
///
/// // Convert from a &str.
/// let p: Password = "hunter2".into();
///
/// // Convert from a &[u8].
/// let p: Password = b"hunter2"[..].into();
///
/// // Convert from a String.
/// let p: Password = String::from("hunter2").into();
///
/// // ...
/// ```
#[derive(Clone, PartialEq, Eq)]
pub struct Password(mem::Encrypted);
assert_send_and_sync!(Password);
impl From<Vec<u8>> for Password {
fn from(v: Vec<u8>) -> Self {
Password(mem::Encrypted::new(v.into()))
}
}
impl From<Box<[u8]>> for Password {
fn from(v: Box<[u8]>) -> Self {
Password(mem::Encrypted::new(v.into()))
}
}
impl From<String> for Password {
fn from(v: String) -> Self {
v.into_bytes().into()
}
}
impl<'a> From<&'a str> for Password {
fn from(v: &'a str) -> Self {
v.to_owned().into()
}
}
impl From<&[u8]> for Password {
fn from(v: &[u8]) -> Self {
Vec::from(v).into()
}
}
impl fmt::Debug for Password {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if cfg!(debug_assertions) {
self.map(|p| write!(f, "Password({:?})", p))
} else {
f.write_str("Password(<Encrypted>)")
}
}
}
impl Password {
/// Maps the given function over the password.
///
/// The password is stored encrypted in memory. This function
/// temporarily decrypts it for the given function to use.
///
/// # Examples
///
/// ```
/// use sequoia_openpgp as openpgp;
/// use openpgp::crypto::Password;
///
/// let p: Password = "hunter2".into();
/// p.map(|p| assert_eq!(p.as_ref(), &b"hunter2"[..]));
/// ```
pub fn map<F, T>(&self, fun: F) -> T
where F: FnMut(&mem::Protected) -> T
{
self.0.map(fun)
}
}
/// Returns the value zero-padded to the given length.
///
/// Some encodings strip leading zero-bytes. This function adds them
/// back, if necessary. If the size exceeds `to`, an error is
/// returned.
pub(crate) fn
|