fedimint_core/encoding/
secp256k1.rs

1use std::io::{Error, Read, Write};
2
3use crate::encoding::{Decodable, DecodeError, Encodable};
4use crate::module::registry::ModuleDecoderRegistry;
5
6impl Encodable for secp256k1::ecdsa::Signature {
7    fn consensus_encode<W: std::io::Write>(&self, writer: &mut W) -> Result<usize, std::io::Error> {
8        let bytes = self.serialize_compact();
9        writer.write_all(&bytes)?;
10        Ok(bytes.len())
11    }
12}
13
14impl Decodable for secp256k1::ecdsa::Signature {
15    fn consensus_decode<D: std::io::Read>(
16        d: &mut D,
17        modules: &ModuleDecoderRegistry,
18    ) -> Result<Self, DecodeError> {
19        Self::from_compact(&<[u8; 64]>::consensus_decode(d, modules)?)
20            .map_err(DecodeError::from_err)
21    }
22}
23
24impl Encodable for secp256k1::PublicKey {
25    fn consensus_encode<W: std::io::Write>(&self, writer: &mut W) -> Result<usize, std::io::Error> {
26        self.serialize().consensus_encode(writer)
27    }
28}
29
30impl Decodable for secp256k1::PublicKey {
31    fn consensus_decode<D: std::io::Read>(
32        d: &mut D,
33        modules: &ModuleDecoderRegistry,
34    ) -> Result<Self, DecodeError> {
35        Self::from_slice(&<[u8; 33]>::consensus_decode(d, modules)?).map_err(DecodeError::from_err)
36    }
37}
38
39impl Encodable for secp256k1::SecretKey {
40    fn consensus_encode<W: std::io::Write>(&self, writer: &mut W) -> Result<usize, std::io::Error> {
41        self.secret_bytes().consensus_encode(writer)
42    }
43}
44
45impl Decodable for secp256k1::SecretKey {
46    fn consensus_decode<D: std::io::Read>(
47        d: &mut D,
48        modules: &ModuleDecoderRegistry,
49    ) -> Result<Self, DecodeError> {
50        Self::from_slice(&<[u8; 32]>::consensus_decode(d, modules)?).map_err(DecodeError::from_err)
51    }
52}
53
54impl Encodable for secp256k1::schnorr::Signature {
55    fn consensus_encode<W: std::io::Write>(&self, writer: &mut W) -> Result<usize, std::io::Error> {
56        let bytes = &self[..];
57        assert_eq!(bytes.len(), secp256k1::constants::SCHNORR_SIGNATURE_SIZE);
58        writer.write_all(bytes)?;
59        Ok(secp256k1::constants::SCHNORR_SIGNATURE_SIZE)
60    }
61}
62
63impl Decodable for secp256k1::schnorr::Signature {
64    fn consensus_decode<D: std::io::Read>(
65        d: &mut D,
66        modules: &ModuleDecoderRegistry,
67    ) -> Result<Self, DecodeError> {
68        let bytes =
69            <[u8; secp256k1::constants::SCHNORR_SIGNATURE_SIZE]>::consensus_decode(d, modules)?;
70        Self::from_slice(&bytes).map_err(DecodeError::from_err)
71    }
72}
73
74impl Encodable for bitcoin::key::Keypair {
75    fn consensus_encode<W: Write>(&self, writer: &mut W) -> Result<usize, Error> {
76        self.secret_bytes().consensus_encode(writer)
77    }
78}
79
80impl Decodable for bitcoin::key::Keypair {
81    fn consensus_decode<D: Read>(
82        d: &mut D,
83        modules: &ModuleDecoderRegistry,
84    ) -> Result<Self, DecodeError> {
85        let sec_bytes = <[u8; 32]>::consensus_decode(d, modules)?;
86        Self::from_seckey_slice(bitcoin::secp256k1::global::SECP256K1, &sec_bytes) // FIXME: evaluate security risk of global ctx
87            .map_err(DecodeError::from_err)
88    }
89}
90
91#[cfg(test)]
92mod tests {
93    use secp256k1::hashes::Hash as BitcoinHash;
94    use secp256k1::Message;
95
96    use super::super::tests::test_roundtrip;
97
98    #[test_log::test]
99    fn test_ecdsa_sig() {
100        let ctx = secp256k1::Secp256k1::new();
101        let (sk, _pk) = ctx.generate_keypair(&mut rand::thread_rng());
102        let sig = ctx.sign_ecdsa(
103            &Message::from_digest(*secp256k1::hashes::sha256::Hash::hash(b"Hello World!").as_ref()),
104            &sk,
105        );
106
107        test_roundtrip(&sig);
108    }
109
110    #[test_log::test]
111    fn test_schnorr_pub_key() {
112        let ctx = secp256k1::global::SECP256K1;
113        let mut rng = rand::rngs::OsRng;
114        let sec_key = bitcoin::key::Keypair::new(ctx, &mut rng);
115        let pub_key = sec_key.public_key();
116        test_roundtrip(&pub_key);
117
118        let sig = ctx.sign_schnorr(
119            &Message::from_digest(*secp256k1::hashes::sha256::Hash::hash(b"Hello World!").as_ref()),
120            &sec_key,
121        );
122
123        test_roundtrip(&sig);
124    }
125}
fedimint_core/encoding/secp256k1.rs

fedimint_core/encoding/
secp256k1.rs
