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|
use anyhow::{anyhow, ensure, Result};
use k256;
use k256::ecdsa::signature::{Signer, Verifier};
use multibase;
use p256;
use std::str::FromStr;
// Need to:
//
// - generate new random keypair
// - generate keypair from seed
// - read/write secret keypair (eg, for PDS config loading)
// - sign bytes (and ipld?) using keypair
// - verify signature bytes (and ipld?) using pubkey
const MULTICODE_P256_BYTES: [u8; 2] = [0x80, 0x24];
const MULTICODE_K256_BYTES: [u8; 2] = [0xe7, 0x01];
pub struct KeyPair {
public: p256::ecdsa::VerifyingKey,
secret: p256::ecdsa::SigningKey,
}
pub enum PubKey {
P256(p256::ecdsa::VerifyingKey),
K256(k256::ecdsa::VerifyingKey),
}
impl KeyPair {
pub fn new_random() -> Self {
let signing = p256::ecdsa::SigningKey::random(&mut p256::elliptic_curve::rand_core::OsRng);
KeyPair {
public: signing.verifying_key(),
secret: signing,
}
}
pub fn from_bytes(bytes: &[u8]) -> Result<KeyPair> {
let signing = p256::ecdsa::SigningKey::from_bytes(bytes)?;
Ok(KeyPair {
public: signing.verifying_key(),
secret: signing,
})
}
pub fn to_bytes(&self) -> Vec<u8> {
self.secret.to_bytes().to_vec()
}
pub fn pubkey(&self) -> PubKey {
PubKey::P256(self.public.clone())
}
pub fn sign_bytes(&self, data: &[u8]) -> String {
println!("BYTES: {:?}", data);
let sig = self.secret.sign(data);
data_encoding::BASE64URL_NOPAD.encode(&sig.to_vec())
}
}
impl PubKey {
pub fn verify_bytes(&self, data: &[u8], sig: &str) -> Result<()> {
println!("BYTES: {:?}", data);
let sig_bytes = data_encoding::BASE64URL_NOPAD.decode(sig.as_bytes())?;
// TODO: better way other than this re-encoding?
let sig_hex = data_encoding::HEXUPPER.encode(&sig_bytes);
match self {
PubKey::P256(key) => {
println!("pre-parse: {}", sig);
let sig = p256::ecdsa::Signature::from_str(&sig_hex)?;
println!("parsed: {}", sig);
Ok(key.verify(data, &sig)?)
}
PubKey::K256(key) => {
let sig = k256::ecdsa::Signature::from_str(&sig_hex)?;
Ok(key.verify(data, &sig)?)
}
}
}
pub fn key_type(&self) -> String {
match self {
PubKey::P256(_) => "EcdsaSecp256r1VerificationKey2019",
PubKey::K256(_) => "EcdsaSecp256k1VerificationKey2019",
}
.to_string()
}
/// This public verification key encoded as base58btc multibase string
pub fn to_multibase(&self) -> String {
let mut bytes: Vec<u8> = vec![];
match self {
PubKey::P256(key) => {
bytes.extend_from_slice(&MULTICODE_P256_BYTES);
bytes.extend_from_slice(&key.to_encoded_point(true).to_bytes());
}
PubKey::K256(key) => {
bytes.extend_from_slice(&MULTICODE_K256_BYTES);
bytes.extend_from_slice(&key.to_bytes());
}
}
format!("{}", multibase::encode(multibase::Base::Base58Btc, &bytes))
}
pub fn to_did_key(&self) -> String {
format!("did:key:{}", self.to_multibase())
}
pub fn from_did_key(did_key: &str) -> Result<Self> {
if !did_key.starts_with("did:key:") || did_key.len() < 20 {
return Err(anyhow!("does not look like a did:key: {}", did_key));
}
let (key_type, bytes) = multibase::decode(&did_key[8..])?;
ensure!(
key_type == multibase::Base::Base58Btc,
"base58btc-encoded key"
);
// prefix bytes
let prefix: [u8; 2] = [bytes[0], bytes[1]];
match prefix {
MULTICODE_K256_BYTES => Ok(PubKey::K256(k256::ecdsa::VerifyingKey::from_sec1_bytes(
&bytes[2..],
)?)),
MULTICODE_P256_BYTES => Ok(PubKey::P256(p256::ecdsa::VerifyingKey::from_sec1_bytes(
&bytes[2..],
)?)),
_ => Err(anyhow!(
"key type (multicodec) not handled when parsing DID key: {}",
did_key
)),
}
}
pub fn to_bytes(&self) -> Vec<u8> {
match self {
PubKey::P256(key) => key.to_encoded_point(true).to_bytes().to_vec(),
PubKey::K256(key) => key.to_bytes().to_vec(),
}
}
}
impl std::fmt::Display for PubKey {
// TODO: what should this actually be, instead of multibase? the did:key representation?
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.to_multibase())
}
}
#[test]
fn test_did_secp256k1_p256() {
// did:key secp256k1 test vectors from W3C
// https://github.com/w3c-ccg/did-method-key/blob/main/test-vectors/secp256k1.json
// via atproto repo
let pairs = vec![
(
"9085d2bef69286a6cbb51623c8fa258629945cd55ca705cc4e66700396894e0c",
"did:key:zQ3shokFTS3brHcDQrn82RUDfCZESWL1ZdCEJwekUDPQiYBme",
),
(
"f0f4df55a2b3ff13051ea814a8f24ad00f2e469af73c363ac7e9fb999a9072ed",
"did:key:zQ3shtxV1FrJfhqE1dvxYRcCknWNjHc3c5X1y3ZSoPDi2aur2",
),
(
"6b0b91287ae3348f8c2f2552d766f30e3604867e34adc37ccbb74a8e6b893e02",
"did:key:zQ3shZc2QzApp2oymGvQbzP8eKheVshBHbU4ZYjeXqwSKEn6N",
),
(
"c0a6a7c560d37d7ba81ecee9543721ff48fea3e0fb827d42c1868226540fac15",
"did:key:zQ3shadCps5JLAHcZiuX5YUtWHHL8ysBJqFLWvjZDKAWUBGzy",
),
(
"175a232d440be1e0788f25488a73d9416c04b6f924bea6354bf05dd2f1a75133",
"did:key:zQ3shptjE6JwdkeKN4fcpnYQY3m9Cet3NiHdAfpvSUZBFoKBj",
),
];
// test decode/encode did:key
for (hex, did) in pairs.iter() {
assert_eq!(did, &PubKey::from_did_key(did).unwrap().to_did_key());
}
let p256_dids = vec![
"did:key:zDnaerx9CtbPJ1q36T5Ln5wYt3MQYeGRG5ehnPAmxcf5mDZpv",
"did:key:zDnaerDaTF5BXEavCrfRZEk316dpbLsfPDZ3WJ5hRTPFU2169",
];
for did in p256_dids {
assert_eq!(did, &PubKey::from_did_key(did).unwrap().to_did_key());
}
}
#[test]
fn test_did_plc_examples() {
// https://atproto.com/specs/did-plc
let example_dids = vec![
"did:key:zDnaejYFhgFiVF89LhJ4UipACLKuqo6PteZf8eKDVKeExXUPk",
"did:key:zDnaeSezF2TgCD71b5DiiFyhHQwKAfsBVqTTHRMvP597Z5Ztn",
"did:key:zDnaeh9v2RmcMo13Du2d6pjUf5bZwtauYxj3n9dYjw4EZUAR7",
"did:key:zDnaedvvAsDE6H3BDdBejpx9ve2Tz95cymyCAKF66JbyMh1Lt",
];
for did in example_dids {
assert_eq!(did, &PubKey::from_did_key(did).unwrap().to_did_key());
}
}
#[test]
fn test_signing() {
let msg = b"you have found the secret message";
let keypair = KeyPair::new_random();
let sig_str = keypair.sign_bytes(msg);
keypair.pubkey().verify_bytes(msg, &sig_str).unwrap();
// and with pubkey that has been serialized/deserialized
let did_key = keypair.pubkey().to_did_key();
let pubkey = PubKey::from_did_key(&did_key).unwrap();
pubkey.verify_bytes(msg, &sig_str).unwrap();
}
|
