Adds offchain message signing test for 7702

Author: nikhil-gupta-tw

android/app/src/androidTest/java/com/trustwallet/core/app/blockchains/ethereum/TestBiz.kt

@@ -242,4 +242,46 @@ class TestBiz {
         val expected = "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"
         assertEquals(expected, Numeric.toHexString(encoded))
     }
+
+    // Off-chain message signing for Biz isValidSignature()
+    @Test
+    fun testBizOffchainMsgSigning() {
+        val chainIdByteArray = "0x7A69".toHexByteArray() // 31337
+        val wallet = "0x328809Bc894f92807417D2dAD6b7C998c1aFdac6"
+
+        val codeAddress = "0xc7183455a4C133Ae270771860664b6B7ec320bB1"
+        val codeName = "Biz"
+        val codeVersion = "v2.0.0"
+        // keccak256("Biz(bytes32 msgHash)")
+        val typeHash = "0x31322a37c2a66b24e1088197e5b24fcc050625c13d4b84c3eaa6a8be5270321d"
+        val domainSeparatorHash = "0xd87cd6ef79d4e2b95e15ce8abf732db51ec771f1ca2edccf22a46c729ac56472"
+
+        // keccak256(abi.encode(keccak256("test message")))
+        val innerHash = "0x4a57b5e386189fd992a83269e996782dbfb8ad539903019abcff0a5b3c012671"
+
+        val encodedHash = WCBiz.getEncodedHash(
+            chainIdByteArray,
+            codeAddress,
+            codeName,
+            codeVersion,
+            typeHash,
+            domainSeparatorHash,
+            wallet,
+            innerHash
+        )
+        assertEquals(
+            "0xf1b5b1122b48d985c9dccaae7978a607b77bd7e0a851ff9e750acacfd2919c3f",
+            Numeric.toHexString(encodedHash)
+        )
+
+        val privateKey = "0x9c0257114eb9399a2985f8e75dad7600c5d89fe3824ffa99ec1c3eb8bf3b0501"
+        val signedHash = WCBiz.getSignedHash(
+            "0xf1b5b1122b48d985c9dccaae7978a607b77bd7e0a851ff9e750acacfd2919c3f",
+            privateKey
+        )
+        assertEquals(
+            "0x08c85dc326ddb9f23265fdc4c71f6d763439a29080353e6a2461e6b0f25cfecb2405e9e2d7fb7bd81ac42d2fbf53253c5e03fa73d8a755727c474f11fa37db401c",
+            Numeric.toHexString(signedHash)
+        )
+    }
 }

rust/tw_evm/tests/biz_ffi.rs

@@ -10,6 +10,7 @@ use tw_evm::address::Address;
 use tw_evm::ffi::biz::{
     tw_biz_get_encoded_hash, tw_biz_get_signed_hash, tw_biz_sign_execute_with_signature_call,
 };
+use tw_hash::sha3::keccak256;
 use tw_memory::test_utils::tw_data_helper::TWDataHelper;
 use tw_memory::test_utils::tw_string_helper::TWStringHelper;
 use tw_number::U256;
@@ -114,3 +115,70 @@ fn test_execute_with_signature_ffi() {
     let expected = "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";
     assert_eq!(encoded.to_vec().unwrap().to_hex_prefixed(), expected);
 }
+
+/// Tests off-chain message signing for Biz `isValidSignature()` (EIP-1271).
+#[test]
+fn test_biz_offchain_msg_signing() {
+    let biz_msg_type_hash = keccak256(b"Biz(bytes32 msgHash)");
+    assert_eq!(
+        hex::encode(&biz_msg_type_hash, true),
+        "0x31322a37c2a66b24e1088197e5b24fcc050625c13d4b84c3eaa6a8be5270321d"
+    );
+
+    let chain_id = U256::from(31337u64).to_big_endian();
+    let chain_id = TWDataHelper::create(chain_id.to_vec());
+    let code_address = TWStringHelper::create("0xc7183455a4C133Ae270771860664b6B7ec320bB1");
+    let code_name = TWStringHelper::create("Biz");
+    let code_version = TWStringHelper::create("v2.0.0");
+    let type_hash = TWStringHelper::create(
+        "0x31322a37c2a66b24e1088197e5b24fcc050625c13d4b84c3eaa6a8be5270321d",
+    );
+    let domain_separator_hash = TWStringHelper::create(
+        "0xd87cd6ef79d4e2b95e15ce8abf732db51ec771f1ca2edccf22a46c729ac56472",
+    );
+    let sender = TWStringHelper::create("0x328809Bc894f92807417D2dAD6b7C998c1aFdac6");
+
+    let raw_hash = keccak256(b"test message");
+    assert_eq!(
+        hex::encode(&raw_hash, true),
+        "0xea83cdcdd06bf61e414054115a551e23133711d0507dcbc07a4bab7dc4581935"
+    );
+
+    let inner_hash = keccak256(&raw_hash);
+    assert_eq!(
+        hex::encode(&inner_hash, true),
+        "0x4a57b5e386189fd992a83269e996782dbfb8ad539903019abcff0a5b3c012671"
+    );
+
+    let inner_hash_str = TWStringHelper::create(&hex::encode(&inner_hash, true));
+    let encoded_hash = TWDataHelper::wrap(unsafe {
+        tw_biz_get_encoded_hash(
+            chain_id.ptr(),
+            code_address.ptr(),
+            code_name.ptr(),
+            code_version.ptr(),
+            type_hash.ptr(),
+            domain_separator_hash.ptr(),
+            sender.ptr(),
+            inner_hash_str.ptr(),
+        )
+    });
+    assert_eq!(
+        hex::encode(encoded_hash.to_vec().unwrap(), true),
+        "0xf1b5b1122b48d985c9dccaae7978a607b77bd7e0a851ff9e750acacfd2919c3f"
+    );
+
+    let private_key = TWStringHelper::create(
+        "0x9c0257114eb9399a2985f8e75dad7600c5d89fe3824ffa99ec1c3eb8bf3b0501",
+    );
+    let encoded_hash_str = TWStringHelper::create(
+        "0xf1b5b1122b48d985c9dccaae7978a607b77bd7e0a851ff9e750acacfd2919c3f",
+    );
+    let signed_hash = TWDataHelper::wrap(unsafe {
+        tw_biz_get_signed_hash(encoded_hash_str.ptr(), private_key.ptr())
+    });
+    assert_eq!(
+        hex::encode(signed_hash.to_vec().unwrap(), true),
+        "0x08c85dc326ddb9f23265fdc4c71f6d763439a29080353e6a2461e6b0f25cfecb2405e9e2d7fb7bd81ac42d2fbf53253c5e03fa73d8a755727c474f11fa37db401c"
+    );
+}