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//! Common types for [encryption] related tasks.
//!
//! [encryption]: https://spec.matrix.org/latest/client-server-api/#end-to-end-encryption
use std::collections::BTreeMap;
use serde::{Deserialize, Serialize};
use crate::{
CrossSigningOrDeviceSignatures, DeviceSignatures, EventEncryptionAlgorithm,
OwnedCrossSigningKeyId, OwnedDeviceId, OwnedDeviceKeyId, OwnedUserId, PrivOwnedStr,
serde::{Base64, StringEnum},
};
/// Identity keys for a device.
#[derive(Clone, Debug, Deserialize, Serialize)]
#[cfg_attr(not(ruma_unstable_exhaustive_types), non_exhaustive)]
pub struct DeviceKeys {
/// The ID of the user the device belongs to.
///
/// Must match the user ID used when logging in.
pub user_id: OwnedUserId,
/// The ID of the device these keys belong to.
///
/// Must match the device ID used when logging in.
pub device_id: OwnedDeviceId,
/// The encryption algorithms supported by this device.
pub algorithms: Vec<EventEncryptionAlgorithm>,
/// Public identity keys.
pub keys: BTreeMap<OwnedDeviceKeyId, String>,
/// Signatures for the device key object.
pub signatures: CrossSigningOrDeviceSignatures,
/// Additional data added to the device key information by intermediate servers, and
/// not covered by the signatures.
#[serde(default, skip_serializing_if = "UnsignedDeviceInfo::is_empty")]
pub unsigned: UnsignedDeviceInfo,
}
impl DeviceKeys {
/// Creates a new `DeviceKeys` from the given user id, device id, algorithms, keys and
/// signatures.
pub fn new(
user_id: OwnedUserId,
device_id: OwnedDeviceId,
algorithms: Vec<EventEncryptionAlgorithm>,
keys: BTreeMap<OwnedDeviceKeyId, String>,
signatures: CrossSigningOrDeviceSignatures,
) -> Self {
Self { user_id, device_id, algorithms, keys, signatures, unsigned: Default::default() }
}
}
/// Additional data added to device key information by intermediate servers.
#[derive(Clone, Debug, Default, Deserialize, Serialize)]
#[cfg_attr(not(ruma_unstable_exhaustive_types), non_exhaustive)]
pub struct UnsignedDeviceInfo {
/// The display name which the user set on the device.
#[serde(skip_serializing_if = "Option::is_none")]
pub device_display_name: Option<String>,
}
impl UnsignedDeviceInfo {
/// Creates an empty `UnsignedDeviceInfo`.
pub fn new() -> Self {
Default::default()
}
/// Checks whether all fields are empty / `None`.
pub fn is_empty(&self) -> bool {
self.device_display_name.is_none()
}
}
/// A key for the SignedCurve25519 algorithm
#[derive(Debug, Clone, Serialize, Deserialize)]
#[cfg_attr(not(ruma_unstable_exhaustive_types), non_exhaustive)]
pub struct SignedKey {
/// Base64-encoded 32-byte Curve25519 public key.
pub key: Base64,
/// Signatures for the key object.
pub signatures: DeviceSignatures,
/// Is this key considered to be a fallback key, defaults to false.
#[serde(default, skip_serializing_if = "crate::serde::is_default")]
pub fallback: bool,
}
impl SignedKey {
/// Creates a new `SignedKey` with the given key and signatures.
pub fn new(key: Base64, signatures: DeviceSignatures) -> Self {
Self { key, signatures, fallback: false }
}
/// Creates a new fallback `SignedKey` with the given key and signatures.
pub fn new_fallback(key: Base64, signatures: DeviceSignatures) -> Self {
Self { key, signatures, fallback: true }
}
}
/// A one-time public key for "pre-key" messages.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[cfg_attr(not(ruma_unstable_exhaustive_types), non_exhaustive)]
#[serde(untagged)]
pub enum OneTimeKey {
/// A key containing signatures, for the SignedCurve25519 algorithm.
SignedKey(SignedKey),
/// A string-valued key, for the Ed25519 and Curve25519 algorithms.
Key(String),
}
/// A [cross-signing] key.
///
/// [cross-signing]: https://spec.matrix.org/latest/client-server-api/#cross-signing
#[derive(Clone, Debug, Deserialize, Serialize)]
#[cfg_attr(not(ruma_unstable_exhaustive_types), non_exhaustive)]
pub struct CrossSigningKey {
/// The ID of the user the key belongs to.
pub user_id: OwnedUserId,
/// What the key is used for.
pub usage: Vec<KeyUsage>,
/// The public key.
///
/// The object must have exactly one property.
pub keys: BTreeMap<OwnedCrossSigningKeyId, String>,
/// Signatures of the key.
///
/// The master key should be signed by the device key and can be signed by other users'
/// user-signing key. The user-signing and self-signing keys must be signed by the master
/// key.
///
/// Only optional for the master key.
#[serde(default, skip_serializing_if = "BTreeMap::is_empty")]
pub signatures: CrossSigningOrDeviceSignatures,
}
impl CrossSigningKey {
/// Creates a new `CrossSigningKey` with the given user ID, usage, keys and signatures.
pub fn new(
user_id: OwnedUserId,
usage: Vec<KeyUsage>,
keys: BTreeMap<OwnedCrossSigningKeyId, String>,
signatures: CrossSigningOrDeviceSignatures,
) -> Self {
Self { user_id, usage, keys, signatures }
}
}
/// The usage of a cross signing key.
#[doc = include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/src/doc/string_enum.md"))]
#[derive(Clone, StringEnum)]
#[cfg_attr(not(ruma_unstable_exhaustive_types), non_exhaustive)]
#[ruma_enum(rename_all = "snake_case")]
pub enum KeyUsage {
/// Master key.
Master,
/// Self-signing key.
SelfSigning,
/// User-signing key.
UserSigning,
#[doc(hidden)]
_Custom(PrivOwnedStr),
}