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use ed25519_dalek::Signer; use hmac::Hmac; use sha2::{Digest, Sha256}; pub const VERSION: u64 = 0; #[derive(Debug, Error)] pub enum KeyError { #[error("Base 58 decoding error")] Encoding(#[from] bs58::decode::Error), #[error(transparent)] Dalek(#[from] ed25519_dalek::ed25519::Error), #[error("No password supplied")] NoPassword, #[error("The key expired")] Expired, } #[derive(Serialize, Deserialize)] pub struct SecretKey { pub version: u64, pub algorithm: Algorithm, #[serde(default, skip_serializing_if = "Option::is_none")] pub expires: Option<chrono::DateTime<chrono::Utc>>, #[serde(default, skip_serializing_if = "Option::is_none")] pub encryption: Option<Encryption>, pub key: String, } pub enum SKey { Ed25519 { key: ed25519_dalek::Keypair, expires: Option<chrono::DateTime<chrono::Utc>>, }, } #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)] pub struct PublicKey { pub version: u64, pub algorithm: Algorithm, #[serde(default, skip_serializing_if = "Option::is_none")] pub expires: Option<chrono::DateTime<chrono::Utc>>, pub signature: String, pub key: String, } #[derive(Debug)] pub enum PKey { Ed25519 { expires: Option<chrono::DateTime<chrono::Utc>>, signature: String, key: ed25519_dalek::PublicKey, }, } #[test] fn sign_public_key() { use chrono::Datelike; let expires = chrono::Utc::now(); let expires = expires.with_year(expires.year() + 1).unwrap(); let sk = SKey::generate(Some(expires)); let pk = sk.public_key(); println!("{:?}", pk); let pk = pk.load().unwrap(); println!("{:?}", pk); } #[derive(Debug, Serialize, Deserialize)] pub struct Signature { pub version: u64, pub key: PublicKey, pub signature: String, pub date: chrono::DateTime<chrono::Utc>, } impl SKey { pub fn sign(&self, h: &[u8]) -> Result<Signature, KeyError> { Ok(Signature { version: VERSION, signature: self.sign_raw(h)?, key: self.public_key(), date: chrono::Utc::now(), }) } pub fn sign_raw(&self, h: &[u8]) -> Result<String, KeyError> { match self { SKey::Ed25519 { key, expires } => { if let Some(expires) = expires { if expires <= &chrono::Utc::now() { return Err(KeyError::Expired); } } let sig = key.sign(&h); Ok(bs58::encode(&sig.to_bytes()).into_string()) } } } pub fn generate(expires: Option<chrono::DateTime<chrono::Utc>>) -> Self { use rand::RngCore; let mut key = [0; 32]; rand::thread_rng().fill_bytes(&mut key); let secret = ed25519_dalek::SecretKey::from_bytes(&key).unwrap(); SKey::Ed25519 { key: ed25519_dalek::Keypair { public: (&secret).into(), secret, }, expires, } } pub fn save(&self, password: Option<&str>) -> SecretKey { match self { SKey::Ed25519 { key, expires } => { let mut key = key.to_bytes(); let encryption = if let Some(password) = password { use rand::Rng; let salt = rand::thread_rng() .sample_iter(&rand::distributions::Alphanumeric) .take(32) .collect(); let enc = Encryption::Aes128(Kdf::Pbkdf2 { salt }); enc.encrypt(password.as_bytes(), &mut key); Some(enc) } else { None }; SecretKey { version: VERSION, algorithm: Algorithm::Ed25519, expires: expires.clone(), encryption, key: bs58::encode(&key).into_string(), } } } } pub fn public_key(&self) -> PublicKey { match self { SKey::Ed25519 { key, expires } => { let to_sign = bincode::serialize(&(Algorithm::Ed25519, expires.clone(), key.public)).unwrap(); debug!("to_sign {:?}", to_sign); let sig = key.sign(&to_sign); PublicKey { version: VERSION, algorithm: Algorithm::Ed25519, expires: expires.clone(), key: bs58::encode(&key.public.clone().to_bytes()).into_string(), signature: bs58::encode(&sig.to_bytes()).into_string(), } } } } pub fn pkey(&self) -> PKey { match self { SKey::Ed25519 { key, expires } => { let to_sign = bincode::serialize(&(Algorithm::Ed25519, expires.clone(), key.public)).unwrap(); debug!("to_sign {:?}", to_sign); let sig = key.sign(&to_sign); PKey::Ed25519 { expires: expires.clone(), key: key.public.clone(), signature: bs58::encode(&sig.to_bytes()).into_string(), } } } } } impl SecretKey { pub fn load(&self, pw: Option<&str>) -> Result<SKey, KeyError> { if let Some(expires) = self.expires { if expires <= chrono::Utc::now() { return Err(KeyError::Expired); } } match self.algorithm { Algorithm::Ed25519 => { let mut key_enc = [0; 64]; bs58::decode(self.key.as_bytes()).into(&mut key_enc)?; if let Some(ref enc) = self.encryption { let password = if let Some(ref pw) = pw { pw } else { return Err(KeyError::NoPassword); }; enc.decrypt(password.as_bytes(), &mut key_enc); } Ok(SKey::Ed25519 { key: ed25519_dalek::Keypair::from_bytes(&key_enc)?, expires: self.expires, }) } } } } impl PublicKey { pub fn fingerprint(&self) -> String { match self.algorithm { Algorithm::Ed25519 => { let signed = bincode::serialize(&(Algorithm::Ed25519, self.expires.clone(), &self.key)) .unwrap(); let mut hash = ed25519_dalek::Sha512::new(); hash.update(&signed); bs58::encode(&hash.finalize()).into_string() } } } pub fn load(&self) -> Result<PKey, KeyError> { match self.algorithm { Algorithm::Ed25519 => { let mut key = [0; 32]; bs58::decode(self.key.as_bytes()).into(&mut key)?; let key = ed25519_dalek::PublicKey::from_bytes(&key)?; let mut signature = [0; 64]; bs58::decode(self.signature.as_bytes()).into(&mut signature)?; let signature = ed25519_dalek::Signature::new(signature); let msg = bincode::serialize(&(Algorithm::Ed25519, self.expires.clone(), &key)).unwrap(); key.verify_strict(&msg, &signature)?; Ok(PKey::Ed25519 { signature: self.signature.clone(), expires: self.expires.clone(), key, }) } } } } impl PKey { pub fn save(&self) -> PublicKey { match self { PKey::Ed25519 { key, expires, signature, } => PublicKey { version: VERSION, algorithm: Algorithm::Ed25519, expires: expires.clone(), signature: signature.clone(), key: bs58::encode(key.as_bytes()).into_string(), }, } } pub fn verify( &self, h: &[u8], signature: &str, date: &chrono::DateTime<chrono::Utc>, ) -> Result<(), KeyError> { match self { PKey::Ed25519 { key, expires, .. } => { if let Some(expires) = expires { if expires <= date { return Err(KeyError::Expired); } } let mut sig = [0; 64]; bs58::decode(signature.as_bytes()).into(&mut sig)?; let sig = ed25519_dalek::Signature::new(sig); key.verify_strict(&h, &sig)?; Ok(()) } } } } #[test] fn verify_test() { use chrono::Datelike; let expires = chrono::Utc::now(); let expires = expires.with_year(expires.year() + 1).unwrap(); let sk = SKey::generate(Some(expires)); let m = b"blabla"; let signature = sk.sign(m).unwrap(); signature.verify(m).unwrap(); } impl Signature { pub fn verify(&self, h: &[u8]) -> Result<(), KeyError> { self.key.load()?.verify(h, &self.signature, &self.date) } } #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)] #[repr(u8)] pub enum Algorithm { Ed25519, } impl From<u8> for Algorithm { fn from(u: u8) -> Self { assert_eq!(u, 0); Algorithm::Ed25519 } } impl From<Algorithm> for u8 { fn from(u: Algorithm) -> Self { match u { Algorithm::Ed25519 => 0, } } } #[derive(Serialize, Deserialize)] pub enum Encryption { Aes128(Kdf), } #[derive(Serialize, Deserialize)] pub enum Kdf { Pbkdf2 { salt: String }, } impl Encryption { pub fn encrypt<'a>(&self, password: &[u8], bytes: &'a mut [u8]) { match self { Encryption::Aes128(Kdf::Pbkdf2 { ref salt }) => { let mut kdf = [0; 32]; pbkdf2::pbkdf2::<Hmac<Sha256>>(password, salt.as_ref(), 10_000, &mut kdf); use aes::{ cipher::FromBlockCipher, cipher::StreamCipher, Aes128, Aes128Ctr, NewBlockCipher, }; let (a, b) = kdf.split_at(16); let cipher = Aes128::new(generic_array::GenericArray::from_slice(&a)); let mut cipher = Aes128Ctr::from_block_cipher( cipher, generic_array::GenericArray::from_slice(b), ); cipher.apply_keystream(bytes); } } } pub fn decrypt<'a>(&self, password: &[u8], bytes: &'a mut [u8]) { self.encrypt(password, bytes) } } #[test] fn encrypt_decrypt() { let enc = Encryption::Aes128(Kdf::Pbkdf2 { salt: "blabla".to_string(), }); let b0 = b"very confidential secret".to_vec(); let mut b = b0.clone(); enc.encrypt(b"password", &mut b[..]); println!("{:?}", b); enc.decrypt(b"password", &mut b[..]); println!("{:?}", b); assert_eq!(b, b0); } #[derive(Clone, Copy)] pub struct SerializedKey { pub(crate) t: u8, k: K, } impl From<ed25519_dalek::PublicKey> for SerializedKey { fn from(k: ed25519_dalek::PublicKey) -> Self { SerializedKey { t: 0, k: K { ed25519: k.as_bytes().clone(), }, } } } impl From<SerializedKey> for ed25519_dalek::PublicKey { fn from(k: SerializedKey) -> Self { assert_eq!(k.t, 0); unsafe { ed25519_dalek::PublicKey::from_bytes(&k.k.ed25519).unwrap() } } } #[derive(Clone, Copy)] pub(crate) union K { ed25519: [u8; 32], }