Add ADR-36 signatures support

Cargo.toml

@@ -2,6 +2,7 @@
 resolver = "3"
 members = [
     "admin-utils",
+    "adr36",
     "auth-call",
     "bitmap",
     "borsh-utils",
@@ -45,6 +46,7 @@ rust-version = "1.86.0"
 
 [workspace.dependencies]
 defuse-admin-utils.path = "admin-utils"
+defuse-adr36.path = "adr36"
 defuse-auth-call.path = "auth-call"
 defuse-bitmap.path = "bitmap"
 defuse-borsh-utils.path = "borsh-utils"

adr36/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "defuse-adr36"
+edition.workspace = true
+version.workspace = true
+rust-version.workspace = true
+repository.workspace = true
+
+[dependencies]
+defuse-crypto = { workspace = true, features = ["serde"] }
+near-sdk.workspace = true
+
+[dev-dependencies]
+near-sdk = { workspace = true, features = ["unit-testing"] }
+hex-literal.workspace = true
+
+[lints]
+workspace = true

adr36/src/lib.rs

@@ -0,0 +1,153 @@
+use defuse_crypto::serde::AsCurve;
+use defuse_crypto::{Curve, Payload, Secp256k1, SignedPayload};
+use near_sdk::base64::engine::{Engine, general_purpose::STANDARD};
+use near_sdk::serde_json::json;
+use near_sdk::{CryptoHash, env, near};
+
+/// [ADR-36 Standard reference](https://github.com/cosmos/cosmos-sdk/blob/main/docs/architecture/adr-036-arbitrary-signature.md)
+/// [Usage docs](https://docs.keplr.app/api/guide/sign-arbitrary#adr-36-signing-with-signamino)
+#[near(serializers = [json])]
+#[serde(rename_all = "snake_case")]
+#[derive(Debug, Clone)]
+pub struct Adr36Payload {
+    pub message: String,
+    /// The Bech32 address of the account that will sign the message.
+    /// Example: `cosmos1skjwj5whet0lpe65qaq4rpq03hjxlwd5c9m9s6`, where:
+    ///     * `cosmos`: network prefix
+    ///     * `1`: separator
+    ///     * remainder: data + checksum
+    pub signer: String,
+}
+
+impl Adr36Payload {
+    #[inline]
+    pub const fn new(message: String, signer: String) -> Self {
+        Self { message, signer }
+    }
+
+    /// [Implementation reference](https://github.com/chainapsis/keplr-wallet/blob/59b2e18122dc2ec3b12d3005fec709e4bcc885f8/packages/cosmos/src/adr-36/amino.ts#L88)
+    #[inline]
+    pub fn prehash(&self) -> Vec<u8> {
+        let json = json!({
+            "account_number": "0",
+            "chain_id": "",
+            "fee": {
+              "amount": [],
+              "gas": "0",
+            },
+            "memo": "",
+            "msgs": [
+              {
+                "type": "sign/MsgSignData",
+                "value": {
+                  "data": STANDARD.encode(self.message.as_bytes()),
+                  "signer": self.signer,
+                },
+              },
+            ],
+            "sequence": "0",
+        });
+        json.to_string().into_bytes()
+    }
+}
+
+impl Payload for Adr36Payload {
+    #[inline]
+    fn hash(&self) -> CryptoHash {
+        env::sha256_array(self.prehash())
+    }
+}
+
+#[near(serializers = [json])]
+#[derive(Debug, Clone)]
+pub struct SignedAdr36Payload {
+    pub payload: Adr36Payload,
+
+    #[serde_as(as = "AsCurve<Secp256k1>")]
+    pub signature: <Secp256k1 as Curve>::Signature,
+}
+
+impl Payload for SignedAdr36Payload {
+    #[inline]
+    fn hash(&self) -> CryptoHash {
+        self.payload.hash()
+    }
+}
+
+impl SignedPayload for SignedAdr36Payload {
+    type PublicKey = <Secp256k1 as Curve>::PublicKey;
+
+    #[inline]
+    fn verify(&self) -> Option<Self::PublicKey> {
+        Secp256k1::verify(&self.signature, &self.payload.hash(), &())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{Adr36Payload, SignedAdr36Payload};
+    use defuse_crypto::{Payload, SignedPayload};
+    use hex_literal::hex;
+    use near_sdk::CryptoHash;
+
+    const fn fix_v_in_signature(mut sig: [u8; 65]) -> [u8; 65] {
+        if *sig.last().unwrap() >= 27 {
+            // Ethereum only uses uncompressed keys, with corresponding value v=27/28
+            // https://bitcoin.stackexchange.com/a/38909/58790
+            *sig.last_mut().unwrap() -= 27;
+        }
+        sig
+    }
+
+    /// golang cosmos-sdk [repro](https://gist.github.com/kuksag/eeb8ef3a77e6751d53db006b206925ab)
+    const REFERENCE_MESSAGE: &str = "Hello, ADR-036!";
+    const REFERENCE_SECP256K1_SIGNER: &str = "cosmos1mnyn7x24xj6vraxeeq56dfkxa009tvhgknhm04";
+    const REFERENCE_SHA256_HASH_MESSAGE_HEX: CryptoHash =
+        hex!("5ac8daed449a016684fd64bade7510b75ccd7c6eefa31b60a10eb577b37575e3");
+    const REFERENCE_SIGNATURE: [u8; 65] = hex!(
+        "043485aac9cd7de64da9548b72635c061e07b20063488c0d3affc3c843b33c0458f799ac6592b6260c5ce326be4996d95ee8cfbea4ae76b820f2a7a01ad3a5cc1b"
+    );
+    const WRONG_REFERENCE_SIGNATURE: [u8; 65] = hex!(
+        "c6ada709bab5a03bdbeb7e53e54ff77afbfec9e4f7b3d1b588e24f09d6f5dc305fa7cdb36c78d9f0c31859879eb930d28c890bcf9e27944e7e8808b1a53c09661c"
+    );
+    const REFERENCE_PUBKEY: [u8; 64] = hex!(
+        "4646ae5047316b4230d0086c8acec687f00b1cd9d1dc634f6cb358ac0a9a8ffffe77b4dd0a4bfb95851f3b7355c781dd60f8418fc8a65d14907aff47c903a559"
+    );
+
+    #[test]
+    fn test_expected_sha256_hash() {
+        let payload = Adr36Payload::new(
+            REFERENCE_MESSAGE.to_string(),
+            REFERENCE_SECP256K1_SIGNER.to_string(),
+        );
+        assert_eq!(payload.hash(), REFERENCE_SHA256_HASH_MESSAGE_HEX);
+    }
+
+    #[test]
+    fn test_reference_signature_verification_works() {
+        let payload = Adr36Payload::new(
+            REFERENCE_MESSAGE.to_string(),
+            REFERENCE_SECP256K1_SIGNER.to_string(),
+        );
+        let signature = fix_v_in_signature(REFERENCE_SIGNATURE);
+
+        assert_eq!(
+            SignedAdr36Payload { payload, signature }.verify(),
+            Some(REFERENCE_PUBKEY)
+        );
+    }
+
+    #[test]
+    fn test_reference_signature_verification_fails() {
+        let payload = Adr36Payload::new(
+            REFERENCE_MESSAGE.to_string(),
+            REFERENCE_SECP256K1_SIGNER.to_string(),
+        );
+        let signature = fix_v_in_signature(WRONG_REFERENCE_SIGNATURE);
+
+        assert_ne!(
+            SignedAdr36Payload { payload, signature }.verify(),
+            Some(REFERENCE_PUBKEY)
+        );
+    }
+}

core/Cargo.toml

@@ -7,6 +7,7 @@ repository.workspace = true
 
 [dependencies]
 defuse-auth-call.workspace = true
+defuse-adr36.workspace = true
 defuse-bitmap.workspace = true
 defuse-crypto = { workspace = true, features = ["serde"] }
 defuse-deadline.workspace = true

core/src/payload/adr36.rs

@@ -0,0 +1,26 @@
+use crate::payload::{DefusePayload, ExtractDefusePayload};
+use defuse_adr36::{Adr36Payload, SignedAdr36Payload};
+use near_sdk::{serde::de::DeserializeOwned, serde_json};
+
+impl<T> ExtractDefusePayload<T> for SignedAdr36Payload
+where
+    T: DeserializeOwned,
+{
+    type Error = serde_json::Error;
+
+    #[inline]
+    fn extract_defuse_payload(self) -> Result<DefusePayload<T>, Self::Error> {
+        self.payload.extract_defuse_payload()
+    }
+}
+
+impl<T> ExtractDefusePayload<T> for Adr36Payload
+where
+    T: DeserializeOwned,
+{
+    type Error = serde_json::Error;
+
+    fn extract_defuse_payload(self) -> Result<DefusePayload<T>, Self::Error> {
+        serde_json::from_str(&self.message)
+    }
+}

core/src/payload/mod.rs

@@ -1,3 +1,4 @@
+pub mod adr36;
 pub mod erc191;
 pub mod multi;
 pub mod nep413;

core/src/payload/multi.rs

@@ -1,3 +1,8 @@
+use super::{
+    DefusePayload, ExtractDefusePayload, raw::SignedRawEd25519Payload,
+    webauthn::SignedWebAuthnPayload,
+};
+use defuse_adr36::SignedAdr36Payload;
 use defuse_crypto::{Payload, PublicKey, SignedPayload};
 use defuse_erc191::SignedErc191Payload;
 use defuse_nep413::SignedNep413Payload;
@@ -7,11 +12,6 @@ use defuse_ton_connect::SignedTonConnectPayload;
 use derive_more::derive::From;
 use near_sdk::{CryptoHash, near, serde::de::DeserializeOwned, serde_json};
 
-use super::{
-    DefusePayload, ExtractDefusePayload, raw::SignedRawEd25519Payload,
-    webauthn::SignedWebAuthnPayload,
-};
-
 #[near(serializers = [json])]
 #[serde(tag = "standard", rename_all = "snake_case")]
 #[derive(Debug, Clone, From)]
@@ -51,6 +51,11 @@ pub enum MultiPayload {
     /// SEP-53: The standard for signing data off-chain for Stellar accounts.
     /// See [SEP-53](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0053.md)
     Sep53(SignedSep53Payload),
+
+    /// ADR-36: The standard for signing data off-chain for accounts on Cosmos SDK.
+    /// Standard reference: https://github.com/cosmos/cosmos-sdk/blob/main/docs/architecture/adr-036-arbitrary-signature.md
+    /// Keplr-Wallet docs (implementation reference): https://docs.keplr.app/api/guide/sign-arbitrary#adr-36-signing-with-signamino
+    Adr36(SignedAdr36Payload),
 }
 
 impl Payload for MultiPayload {
@@ -68,6 +73,7 @@ impl Payload for MultiPayload {
             Self::WebAuthn(payload) => payload.hash(),
             Self::TonConnect(payload) => payload.hash(),
             Self::Sep53(payload) => payload.hash(),
+            Self::Adr36(payload) => payload.hash(),
         }
     }
 }
@@ -85,6 +91,7 @@ impl SignedPayload for MultiPayload {
             Self::WebAuthn(payload) => payload.verify(),
             Self::TonConnect(payload) => payload.verify().map(PublicKey::Ed25519),
             Self::Sep53(payload) => payload.verify().map(PublicKey::Ed25519),
+            Self::Adr36(payload) => payload.verify().map(PublicKey::Secp256k1),
         }
     }
 }
@@ -105,6 +112,7 @@ where
             Self::WebAuthn(payload) => payload.extract_defuse_payload(),
             Self::TonConnect(payload) => payload.extract_defuse_payload(),
             Self::Sep53(payload) => payload.extract_defuse_payload(),
+            Self::Adr36(payload) => payload.extract_defuse_payload(),
         }
     }
 }