ursa 0.1.0-dev-2

This is the shared crypto library for Hyperledger components.
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pub mod secp256k1;
pub mod ed25519;

use CryptoError;
use keys::{PrivateKey, PublicKey, KeyPairOption};

pub trait SignatureScheme {
    fn new() -> Self;
    fn keypair(&self, options: Option<KeyPairOption>) -> Result<(PublicKey, PrivateKey), CryptoError>;
    fn sign(&self, message: &[u8], sk: &PrivateKey) -> Result<Vec<u8>, CryptoError>;
    fn verify(&self, message: &[u8], signature: &[u8], pk: &PublicKey) -> Result<bool, CryptoError>;
    fn signature_size() -> usize;
    fn private_key_size() -> usize;
    fn public_key_size() -> usize;
}

pub struct Signer<'a, 'b, T: 'a + SignatureScheme> {
    scheme: &'a T,
    key: &'b PrivateKey
}

impl<'a, 'b, T: 'a + SignatureScheme> Signer<'a, 'b, T> {
    /// Constructs a new Signer
    ///
    /// # Arguments
    ///
    /// * `scheme` - a cryptographic signature scheme
    /// * `private_key` - private key
    pub fn new(scheme: &'a T, key: &'b PrivateKey) -> Self {
        Signer { scheme, key }
    }

    /// Signs the given message.
    ///
    /// # Arguments
    ///
    /// * `message` - the message bytes
    ///
    /// # Returns
    ///
    /// * `signature` - the signature bytes
    pub fn sign(&self, message: &[u8]) -> Result<Vec<u8>, CryptoError> {
        self.scheme.sign(message, self.key)
    }

    /// Return the public key for this Signer instance.
    ///
    /// # Returns
    ///
    /// * `public_key` - the public key instance
    pub fn get_public_key(&self) -> Result<PublicKey, CryptoError> {
        let (pubk, _) = self.scheme.keypair(Some(KeyPairOption::FromSecretKey(self.key))).unwrap();
        Ok(pubk)
    }
}

pub trait EcdsaPublicKeyHandler {
    /// Returns the compressed bytes
    fn serialize(&self, pk: &PublicKey) -> Vec<u8>;
    /// Returns the uncompressed bytes
    fn serialize_uncompressed(&self, pk: &PublicKey) -> Vec<u8>;
    /// Read raw bytes into key struct. Can be either compressed or uncompressed
    fn parse(&self, data: &[u8]) -> Result<PublicKey, CryptoError>;
    fn public_key_uncompressed_size() -> usize;
}