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// Copyright 2023 Google LLC
//
// 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.
use crypto_provider::ed25519::{
InvalidBytes, InvalidSignature, Signature as _, SignatureError, KEY_LENGTH, KEY_PAIR_LENGTH,
SIGNATURE_LENGTH,
};
use openssl::pkey::{Id, PKey, Private};
use openssl::sign::{Signer, Verifier};
pub struct Ed25519;
impl crypto_provider::ed25519::Ed25519Provider for Ed25519 {
type KeyPair = KeyPair;
type PublicKey = PublicKey;
type Signature = Signature;
}
pub struct KeyPair(PKey<Private>);
impl crypto_provider::ed25519::KeyPair for KeyPair {
type PublicKey = PublicKey;
type Signature = Signature;
fn to_bytes(&self) -> [u8; KEY_PAIR_LENGTH] {
let private_key = self.0.raw_private_key().unwrap();
let mut public_key = self.0.raw_public_key().unwrap();
let mut result = private_key;
result.append(&mut public_key);
result.try_into().unwrap()
}
fn from_bytes(bytes: [u8; KEY_PAIR_LENGTH]) -> Result<Self, InvalidBytes> {
PKey::private_key_from_raw_bytes(&bytes[..KEY_LENGTH], Id::ED25519)
.map(Self)
.map_err(|_| InvalidBytes)
}
fn sign(&self, msg: &[u8]) -> Self::Signature {
let mut signer =
Signer::new_without_digest(&self.0).expect("should be able to create a signer");
let sig_bytes: [u8; SIGNATURE_LENGTH] = signer
.sign_oneshot_to_vec(msg)
.expect("singing should succeed")
.try_into()
.expect("signature should be a valid size");
Self::Signature::from_bytes(&sig_bytes).expect("this should never fail")
}
fn generate() -> Self {
let key = PKey::generate_ed25519().expect("key generation should not fail");
Self(key)
}
fn public(&self) -> Self::PublicKey {
PublicKey(
self.0
.raw_public_key()
.expect("should be able to get a pubic key from a keypair"),
)
}
}
pub struct Signature([u8; SIGNATURE_LENGTH]);
impl crypto_provider::ed25519::Signature for Signature {
fn from_bytes(bytes: &[u8]) -> Result<Self, InvalidSignature> {
bytes.try_into().map(Self).map_err(|_| InvalidSignature)
}
fn to_bytes(&self) -> [u8; SIGNATURE_LENGTH] {
self.0
}
}
pub struct PublicKey(Vec<u8>);
impl crypto_provider::ed25519::PublicKey for PublicKey {
type Signature = Signature;
fn to_bytes(&self) -> [u8; KEY_LENGTH] {
//Should be length 32
self.0.as_slice().try_into().unwrap()
}
fn verify_strict(
&self,
message: &[u8],
signature: &Self::Signature,
) -> Result<(), SignatureError> {
let public_key = PKey::public_key_from_raw_bytes(self.0.as_slice(), Id::ED25519)
.expect("should be a valid public key");
let mut verifier = Verifier::new_without_digest(public_key.as_ref())
.expect("should be able to init verifier");
let result = verifier
.verify_oneshot(signature.0.as_slice(), message)
.expect("should be able to call verify");
if result {
Ok(())
} else {
Err(SignatureError)
}
}
}
#[cfg(test)]
mod tests {
use crate::ed25519::Ed25519;
use crypto_provider::ed25519::testing::{run_rfc_test_vectors, run_wycheproof_test_vectors};
#[test]
fn wycheproof_test_ed25519_openssl() {
run_wycheproof_test_vectors::<Ed25519>()
}
#[test]
fn rfc_test_ed25519_openssl() {
run_rfc_test_vectors::<Ed25519>()
}
}
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