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feat(evm): randao support for evm #2151

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merged 3 commits into from
Jan 9, 2025
Merged

feat(evm): randao support for evm #2151

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c6b71f6
feat(evm): randao support for evm
onikonychev Jan 8, 2025
d67b40f
test: checked that random changes with block time
onikonychev Jan 8, 2025
6f3ebba
Merge branch 'main' into feat/evm-random
k-yang Jan 9, 2025
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -63,6 +63,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
- [#2144](https://github.com/NibiruChain/nibiru/pull/2144) - feat(token-registry): Implement strongly typed Nibiru Token Registry and generation command
- [#2145](https://github.com/NibiruChain/nibiru/pull/2145) - chore(token-registry): add xNIBI Astrovault LST to registry
- [#2147](https://github.com/NibiruChain/nibiru/pull/2147) - fix(simapp): manually add x/vesting Cosmos-SDK module types to the codec in simulation tests since they are expected by default
- [#2151](https://github.com/NibiruChain/nibiru/pull/2151) - feat(evm): randao support for evm

#### Nibiru EVM | Before Audit 2 - 2024-12-06

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24 changes: 24 additions & 0 deletions x/evm/embeds/artifacts/contracts/TestRandom.sol/TestRandom.json
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@@ -0,0 +1,24 @@
{
"_format": "hh-sol-artifact-1",
"contractName": "TestRandom",
"sourceName": "contracts/TestRandom.sol",
"abi": [
{
"inputs": [],
"name": "getRandom",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
}
],
"bytecode": "0x608060405234801561001057600080fd5b5060b58061001f6000396000f3fe6080604052348015600f57600080fd5b506004361060285760003560e01c8063aacc5a1714602d575b600080fd5b60336047565b604051603e91906066565b60405180910390f35b600044905090565b6000819050919050565b606081604f565b82525050565b6000602082019050607960008301846059565b9291505056fea264697066735822122021d2de67a73b1cbeefb199f56299f80c5f7aeb23a677b105ef78f6880f75491464736f6c63430008180033",
"deployedBytecode": "0x6080604052348015600f57600080fd5b506004361060285760003560e01c8063aacc5a1714602d575b600080fd5b60336047565b604051603e91906066565b60405180910390f35b600044905090565b6000819050919050565b606081604f565b82525050565b6000602082019050607960008301846059565b9291505056fea264697066735822122021d2de67a73b1cbeefb199f56299f80c5f7aeb23a677b105ef78f6880f75491464736f6c63430008180033",
"linkReferences": {},
"deployedLinkReferences": {}
}
10 changes: 10 additions & 0 deletions x/evm/embeds/contracts/TestRandom.sol
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@@ -0,0 +1,10 @@
// contracts/TestERC20.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

contract TestRandom {

function getRandom() public view returns (uint256) {
return block.prevrandao;
}
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🛠️ Refactor suggestion

Add documentation and security considerations for randomness generation

The getRandom function directly exposes block.prevrandao which has important security implications:

  1. The value is predictable by validators
  2. Can be manipulated in certain scenarios
  3. Should not be used directly for high-stakes randomness

Add comprehensive NatSpec documentation:

+    /// @notice Retrieves the previous block's RANDAO value
+    /// @dev WARNING: This randomness source has limitations:
+    ///      - Predictable by validators
+    ///      - Should not be used for high-stakes applications
+    ///      - Consider using a commit-reveal scheme for better unpredictability
+    /// @return uint256 The previous block's RANDAO value
     function getRandom() public view returns (uint256) {
         return block.prevrandao;
     }

Consider implementing a more secure randomness mechanism:

  1. Use a commit-reveal scheme
  2. Combine multiple entropy sources
  3. Consider using VRF (Verifiable Random Function) for critical applications
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
function getRandom() public view returns (uint256) {
return block.prevrandao;
}
/// @notice Retrieves the previous block's RANDAO value
/// @dev WARNING: This randomness source has limitations:
/// - Predictable by validators
/// - Should not be used for high-stakes applications
/// - Consider using a commit-reveal scheme for better unpredictability
/// @return uint256 The previous block's RANDAO value
function getRandom() public view returns (uint256) {
return block.prevrandao;
}

}
8 changes: 8 additions & 0 deletions x/evm/embeds/embeds.go
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Expand Up @@ -41,6 +41,8 @@ var (
testInfiniteRecursionERC20Json []byte
//go:embed artifacts/contracts/TestERC20TransferWithFee.sol/TestERC20TransferWithFee.json
testERC20TransferWithFee []byte
//go:embed artifacts/contracts/TestRandom.sol/TestRandom.json
testRandom []byte
)

var (
Expand Down Expand Up @@ -134,6 +136,11 @@ var (
Name: "TestERC20TransferWithFee.sol",
EmbedJSON: testERC20TransferWithFee,
}
// SmartContract_TestRandom is a test contract which tests random function
SmartContract_TestRandom = CompiledEvmContract{
Name: "TestRandom.sol",
EmbedJSON: testRandom,
}
)

func init() {
Expand All @@ -150,6 +157,7 @@ func init() {
SmartContract_TestPrecompileSelfCallRevert.MustLoad()
SmartContract_TestInfiniteRecursionERC20.MustLoad()
SmartContract_TestERC20TransferWithFee.MustLoad()
SmartContract_TestRandom.MustLoad()
}

type CompiledEvmContract struct {
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1 change: 1 addition & 0 deletions x/evm/embeds/embeds_test.go
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Expand Up @@ -21,5 +21,6 @@ func TestLoadContracts(t *testing.T) {
embeds.SmartContract_TestERC20TransferThenPrecompileSend.MustLoad()
embeds.SmartContract_TestInfiniteRecursionERC20.MustLoad()
embeds.SmartContract_TestERC20TransferWithFee.MustLoad()
embeds.SmartContract_TestRandom.MustLoad()
})
}
7 changes: 6 additions & 1 deletion x/evm/keeper/msg_server.go
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Expand Up @@ -3,6 +3,7 @@ package keeper

import (
"context"
"encoding/binary"
"encoding/json"
"fmt"
"math/big"
Expand Down Expand Up @@ -121,6 +122,10 @@ func (k *Keeper) NewEVM(
tracer vm.EVMLogger,
stateDB vm.StateDB,
) *vm.EVM {
pseudoRandomBytes := make([]byte, 8)
binary.BigEndian.PutUint64(pseudoRandomBytes, uint64(ctx.BlockHeader().Time.UnixNano()))
pseudoRandom := crypto.Keccak256Hash(append(pseudoRandomBytes, ctx.BlockHeader().LastCommitHash...))

blockCtx := vm.BlockContext{
CanTransfer: core.CanTransfer,
Transfer: core.Transfer,
Expand All @@ -131,7 +136,7 @@ func (k *Keeper) NewEVM(
Time: big.NewInt(ctx.BlockHeader().Time.Unix()),
Difficulty: big.NewInt(0), // unused. Only required in PoW context
BaseFee: evmConfig.BaseFeeWei,
Random: nil, // not supported
Random: &pseudoRandom,
}

txCtx := core.NewEVMTxContext(msg)
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35 changes: 35 additions & 0 deletions x/evm/keeper/random_test.go
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@@ -0,0 +1,35 @@
// Copyright (c) 2023-2024 Nibi, Inc.
package keeper_test

import (
"time"

"github.com/NibiruChain/nibiru/v2/x/evm/embeds"
"github.com/NibiruChain/nibiru/v2/x/evm/evmtest"
)

// TestRandom tests the random value generation within the EVM.
func (s *Suite) TestRandom() {
deps := evmtest.NewTestDeps()
deployResp, err := evmtest.DeployContract(&deps, embeds.SmartContract_TestRandom)
s.Require().NoError(err)
randomContractAddr := deployResp.ContractAddr

// highjacked LoadERC20BigInt method as it perfectly fits the need of this test
random1, err := deps.EvmKeeper.LoadERC20BigInt(
deps.Ctx, embeds.SmartContract_TestRandom.ABI, randomContractAddr, "getRandom",
)
s.Require().NoError(err)
s.Require().NotNil(random1)
s.Require().NotZero(random1.Int64())

// Update block time to check that random changes
deps.Ctx = deps.Ctx.WithBlockTime(deps.Ctx.BlockTime().Add(1 * time.Second))
random2, err := deps.EvmKeeper.LoadERC20BigInt(
deps.Ctx, embeds.SmartContract_TestRandom.ABI, randomContractAddr, "getRandom",
)
s.Require().NoError(err)
s.Require().NotNil(random1)
s.Require().NotZero(random2.Int64())
s.Require().NotEqual(random1, random2)
}
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