defuse_tip191/
lib.rs

1use defuse_crypto::{CryptoHash, Curve, Payload, Secp256k1, SignedPayload, serde::AsCurve};
2use impl_tools::autoimpl;
3use near_sdk::{env, near, serde_with::serde_as};
4
5/// See [TIP-191](https://github.com/tronprotocol/tips/blob/master/tip-191.md)
6#[near(serializers = [json])]
7#[derive(Debug, Clone)]
8pub struct Tip191Payload(pub String);
9
10impl Tip191Payload {
11    #[inline]
12    pub fn prehash(&self) -> Vec<u8> {
13        let data = self.0.as_bytes();
14        [
15            // Prefix not specified in the standard. But from: https://tronweb.network/docu/docs/Sign%20and%20Verify%20Message/
16            format!("\x19TRON Signed Message:\n{}", data.len()).as_bytes(),
17            data,
18        ]
19        .concat()
20    }
21}
22
23impl Payload for Tip191Payload {
24    #[inline]
25    fn hash(&self) -> CryptoHash {
26        env::keccak256_array(self.prehash())
27    }
28}
29
30#[near(serializers = [json])]
31#[autoimpl(Deref using self.payload)]
32#[derive(Debug, Clone)]
33pub struct SignedTip191Payload {
34    pub payload: Tip191Payload,
35
36    /// There is no public key member because the public key can be recovered
37    /// via `ecrecover()` knowing the data and the signature
38    #[serde_as(as = "AsCurve<Secp256k1>")]
39    pub signature: <Secp256k1 as Curve>::Signature,
40}
41
42impl Payload for SignedTip191Payload {
43    #[inline]
44    fn hash(&self) -> CryptoHash {
45        self.payload.hash()
46    }
47}
48
49impl SignedPayload for SignedTip191Payload {
50    type PublicKey = <Secp256k1 as Curve>::PublicKey;
51
52    #[inline]
53    fn verify(&self) -> Option<Self::PublicKey> {
54        Secp256k1::verify(&self.signature, &self.payload.hash(), &())
55    }
56}
57
58#[cfg(test)]
59mod tests {
60    use super::*;
61    use hex_literal::hex;
62
63    const fn fix_v_in_signature(mut sig: [u8; 65]) -> [u8; 65] {
64        if *sig.last().unwrap() >= 27 {
65            // Ethereum only uses uncompressed keys, with corresponding value v=27/28
66            // https://bitcoin.stackexchange.com/a/38909/58790
67            *sig.last_mut().unwrap() -= 27;
68        }
69        sig
70    }
71
72    // NOTE: Public key can be derived using `ethers_signers` crate:
73    // let wallet = LocalWallet::from_str(
74    //     "a4b319a82adfc43584e4537fec97a80516e16673db382cd91eba97abbab8ca56",
75    // )?;
76    // let signing_key = wallet.signer();
77    // let verifying_key = signing_key.verifying_key();
78    // let public_key = verifying_key.to_encoded_point(false);
79    // // Notice that we skip the first byte, 0x04
80    // println!("Public key: 0x{}", hex::encode(public_key.as_bytes()[1..]));
81
82    const REFERENCE_MESSAGE: &str = "Hello, TRON!";
83    const INVALID_REFERENCE_MESSAGE: &str = "this is not TRON reference input message";
84    const REFERENCE_SIGNATURE: [u8; 65] = hex!(
85        "eea1651a60600ec4d9c45e8ae81da1a78377f789f0ac2019de66ad943459913015ef9256809ee0e6bb76e303a0b4802e475c1d26ade5d585292b80c9fe9cb10c1c"
86    );
87    const INVALID_REFERENCE_SIGNATURE: [u8; 65] = hex!(
88        "0000000011111111000000001110111110000000011111111e66ad943459913015ef9256809ee0e6bb76e303a0b4802e475c1d26ade5d585292b80c9fe9cb10c1c"
89    );
90    const REFERENCE_PUBKEY: [u8; 64] = hex!(
91        "85a66984273f338ce4ef7b85e5430b008307e8591bb7c1b980852cf6423770b801f41e9438155eb53a5e20f748640093bb42ae3aeca035f7b7fd7a1a21f22f68"
92    );
93
94    #[test]
95    fn test_reference_signature_verification_works() {
96        assert_eq!(
97            SignedTip191Payload {
98                payload: Tip191Payload(REFERENCE_MESSAGE.to_string()),
99                signature: fix_v_in_signature(REFERENCE_SIGNATURE),
100            }
101            .verify(),
102            Some(REFERENCE_PUBKEY)
103        );
104    }
105
106    #[test]
107    fn test_invalid_reference_message_verification_fails() {
108        assert_ne!(
109            SignedTip191Payload {
110                payload: Tip191Payload(INVALID_REFERENCE_MESSAGE.to_string()),
111                signature: fix_v_in_signature(REFERENCE_SIGNATURE),
112            }
113            .verify(),
114            Some(REFERENCE_PUBKEY)
115        );
116    }
117
118    #[test]
119    fn test_invalid_reference_signature_verification_fails() {
120        assert_ne!(
121            SignedTip191Payload {
122                payload: Tip191Payload(REFERENCE_MESSAGE.to_string()),
123                signature: fix_v_in_signature(INVALID_REFERENCE_SIGNATURE),
124            }
125            .verify(),
126            Some(REFERENCE_PUBKEY)
127        );
128    }
129}
defuse_tip191/lib.rs

defuse_tip191/
lib.rs
