1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58

use super::{ed25519_dalek as ed25519, EnrKey, EnrPublicKey, SigningError};
use rlp::DecoderError;
use std::collections::BTreeMap;

/// The ENR key that stores the public key in the ENR record.
pub const ENR_KEY: &str = "ed25519";

impl EnrKey for ed25519::Keypair {
    type PublicKey = ed25519::PublicKey;

    /// Performs ENR-specific signing.
    ///
    /// Using `ed25519` keys do not currently follow the `v4` identity scheme, which dictates
    /// `secp256k1` keys should be used.
    fn sign_v4(&self, msg: &[u8]) -> Result<Vec<u8>, SigningError> {
        Ok(self.sign(msg).to_bytes().to_vec())
    }

    /// Returns the public key associated with the private key.
    fn public(&self) -> Self::PublicKey {
        self.public
    }

    /// Decodes the raw bytes of an ENR's content into a public key if possible.
    fn enr_to_public(content: &BTreeMap<String, Vec<u8>>) -> Result<Self::PublicKey, DecoderError> {
        if let Some(pubkey_bytes) = content.get(ENR_KEY) {
            ed25519::PublicKey::from_bytes(pubkey_bytes)
                .map_err(|_| DecoderError::Custom("Invalid ed25519 Signature"))
        } else {
            Err(DecoderError::Custom("Unknown signature"))
        }
    }
}

impl EnrPublicKey for ed25519::PublicKey {
    /// Verify a raw message, given a public key for the v4 identity scheme.
    fn verify_v4(&self, msg: &[u8], sig: &[u8]) -> bool {
        ed25519::Signature::from_bytes(sig)
            .and_then(|s| self.verify(msg, &s))
            .is_ok()
    }

    /// Encodes the public key into compressed form, if possible.
    fn encode(&self) -> Vec<u8> {
        self.to_bytes().to_vec()
    }

    /// Encodes the public key in uncompressed form. This is the same as the compressed form for
    /// ed25519 keys
    fn encode_uncompressed(&self) -> Vec<u8> {
        self.encode()
    }

    /// Generates the ENR public key string associated with the ed25519 key type.
    fn enr_key(&self) -> String {
        ENR_KEY.into()
    }
}