sp_block_producer_metadata/
lib.rs

1#![cfg_attr(not(feature = "std"), no_std)]
2
3use parity_scale_codec::{Decode, Encode};
4use sidechain_domain::*;
5use sp_api;
6extern crate alloc;
7
8#[derive(Debug, Clone, Encode)]
9pub struct MetadataSignedMessage<Metadata> {
10	pub cross_chain_pub_key: CrossChainPublicKey,
11	pub metadata: Metadata,
12	pub genesis_utxo: UtxoId,
13}
14
15impl<M: Encode> MetadataSignedMessage<M> {
16	#[cfg(feature = "std")]
17	pub fn sign_with_key(&self, skey: &k256::SecretKey) -> CrossChainSignature {
18		use k256::Secp256k1;
19		use k256::ecdsa::hazmat::DigestPrimitive;
20		use k256::ecdsa::*;
21		use k256::sha2::Digest;
22		let data = self.encode();
23		let digest = <Secp256k1 as DigestPrimitive>::Digest::new_with_prefix(data);
24
25		let (sig, _recid) = SigningKey::from(skey).sign_digest_recoverable(digest.clone()).unwrap();
26		CrossChainSignature(sig.to_vec())
27	}
28
29	pub fn verify_signature(
30		&self,
31		vkey: &CrossChainPublicKey,
32		signature: CrossChainSignature,
33	) -> Result<(), k256::ecdsa::signature::Error> {
34		signature.verify(vkey, &self.encode())
35	}
36}
37
38#[cfg(test)]
39mod tests {
40	use super::*;
41	use hex_literal::hex;
42
43	#[test]
44	fn round_trip() {
45		let message = MetadataSignedMessage {
46			cross_chain_pub_key: CrossChainPublicKey(vec![1; 32]),
47			metadata: "metadata".to_string(),
48			genesis_utxo: UtxoId::new([2; 32], 0),
49		};
50
51		// Alice cross-chain key
52		let skey = k256::SecretKey::from_slice(&hex!(
53			"cb6df9de1efca7a3998a8ead4e02159d5fa99c3e0d4fd6432667390bb4726854"
54		))
55		.unwrap();
56		let vkey = skey.public_key();
57
58		let signature = message.sign_with_key(&skey);
59
60		assert!(message.verify_signature(&vkey.into(), signature).is_ok());
61	}
62}
63
64sp_api::decl_runtime_apis! {
65	pub trait BlockProducerMetadataApi<Metadata>
66	where Metadata:Decode
67	{
68		/// Retrieves the metadata for a given SPO public key if it exists.
69		fn get_metadata_for(
70			cross_chain_pub_key: &CrossChainPublicKey,
71		) -> Option<Metadata>;
72	}
73}
sp_block_producer_metadata/lib.rs

sp_block_producer_metadata/
lib.rs
