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// Copyright 2021 Denis Kasak, Damir Jelić
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
mod curve25519;
mod ed25519;
pub(crate) use curve25519::{Curve25519Keypair, Curve25519KeypairPickle};
pub use curve25519::{Curve25519PublicKey, Curve25519SecretKey};
pub use ed25519::{
Ed25519Keypair, Ed25519KeypairPickle, Ed25519PublicKey, Ed25519SecretKey, Ed25519Signature,
SignatureError,
};
use serde::{Deserialize, Serialize};
use thiserror::Error;
pub use x25519_dalek::SharedSecret;
/// A unique identifier for a one-time [`Curve25519PublicKey`].
///
/// This identifier uses an internal counter to track the order in which
/// one-time keys are generated.
#[derive(Clone, Copy, Debug, Hash, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
pub struct KeyId(pub(super) u64);
impl From<KeyId> for String {
fn from(value: KeyId) -> String {
value.to_base64()
}
}
impl KeyId {
/// Encodes the [`KeyId`] in Base64.
///
/// The internal counter is represented in big-endian format and then
/// encoded using Base64.
pub fn to_base64(self) -> String {
crate::utilities::base64_encode(self.0.to_be_bytes())
}
}
/// Error type for failures that may occur when decoding or using a
/// cryptographic key.
#[derive(Error, Debug)]
pub enum KeyError {
/// Failed to correctly decode a public key that was encoded in Base64.
#[error("Failed to decode a public key from Base64: {0}")]
Base64Error(#[from] base64::DecodeError),
/// Failed to correctly decode a private key that was encoded in Base64.
#[error("Failed to decode a private key from Base64: {0}")]
Base64PrivateKey(#[from] base64ct::Error),
/// The Base64 encoded key does not contain the expected number of bytes.
#[error(
"Failed to decode {key_type} key from Base64: \
Invalid number of bytes for {key_type}, expected {expected_length}, got {length}."
)]
InvalidKeyLength {
/// The type of key being decoded.
key_type: &'static str,
/// The expected length of the key.
expected_length: usize,
/// The actual length of the key.
length: usize,
},
/// Unable to decompress the curve point `r` from an [`Ed25519PublicKey`].
///
/// For more details, see [RFC 8032, Section 5.1.3](https://www.rfc-editor.org/rfc/rfc8032.html#section-5.1.3).
#[error(transparent)]
Signature(#[from] SignatureError),
/// One or more keys lacked contributory behavior in the Diffie-Hellman
/// operation, resulting in an insecure shared secret.
///
/// For more details on contributory behavior please refer to the
/// [`x25519_dalek::SharedSecret::was_contributory()`] method.
#[error(
"One or more keys lacked contributory behavior in the Diffie-Hellman operation, \
resulting in an insecure shared secret"
)]
NonContributoryKey,
}
#[cfg(test)]
mod test {
use crate::KeyId;
#[test]
fn key_id_to_base64() {
assert_eq!(KeyId(0).to_base64(), "AAAAAAAAAAA");
assert_eq!(KeyId(7).to_base64(), "AAAAAAAAAAc");
}
#[test]
fn key_id_to_string() {
assert_eq!(String::from(KeyId(0)), "AAAAAAAAAAA");
assert_eq!(String::from(KeyId(7)), "AAAAAAAAAAc");
}
}