Sample Solidity and node.js code demonstrating the trickery involved in ecrecover when testing against testrpc/Ganache vs. geth/Quorum nodes
- Node.js: https://nodejs.org/en/download/
- Truffle: https://www.trufflesuite.com/docs/truffle/getting-started/installation
First install the minimal dependencies and configure the target Ethereum node:
npm i
export ETH_URL=<full URL of your Kaleido node like https://username:[email protected]>
To test against testrpc or Ganache using the default network
truffle test
To test against a Kaleido network
truffle test --network kaleido
The test script demonstrates the usage of eth.sign() method on an Ethereum blockchain node, in order to use the built-in wallet inside the node to sign a piece of data. This method is not supported identically across different Ethereum implementations, which can cause confusions when developing with Kaleido.
testrpc and Ganache returns 00 or 01 for the V value portion of the signature. So 27 must be added in order to calculate the correct value.
Geth/Quorum both returns the V value according to the ecrecover technique, with 27 already added.
| Protocol | eth.sign() supported? |
To calculate V value from returned signature |
|---|---|---|
| Geth | Yes | web3.utils.toDecimal("0x" + sig.slice(130, 132)) |
| Quorum | Yes | web3.utils.toDecimal("0x" + sig.slice(130, 132)) |
| Besu | No | |
| testrpc | Yes | web3.utils.toDecimal("0x" + sig.slice(130, 132)) + 27 |
| Ganache | Yes | web3.utils.toDecimal("0x" + sig.slice(130, 132)) + 27 |
Using network 'kaleido'.
Compiling your contracts...
===========================
> Compiling ./contracts/Test.sol
Contract: Test
verify()
✓ deploys the Test contract (3602ms)
docHash: 0xd81c6c15bb6cbed0dcfb5dcb918302e0a3021e062f3eb157b3be0aa7d6500930
signing with account: 0xea4CE501fa8b7a77486F0b8B53C25346415228E4
Signature: 0x7e7424ae9aa49eab6e480661e236f9ba974b701a67b42e39638cbb23b7fe5e4960ad936aee388bb59d8d18a03d7ce1bbc783ff01703217f44b6e4b090ce8ff7e1b
Seems to be in a Kaleido network, V is already calculated
V: 0x1b, R: 0x7e7424ae9aa49eab6e480661e236f9ba974b701a67b42e39638cbb23b7fe5e49, S: 0x60ad936aee388bb59d8d18a03d7ce1bbc783ff01703217f44b6e4b090ce8ff7e
{
tx: '0xc35f83c944a4897b39c24299484e841ab7b8097cd553d4309d3078fedbcf0f6e',
receipt: {
blockHash: '0xe1c0d9513fbba5ea9a9ddd0e96a9f7927622aef00414321c5d472f7415ee2d85',
blockNumber: 234051,
contractAddress: null,
cumulativeGasUsed: 36520,
from: '0xea4ce501fa8b7a77486f0b8b53c25346415228e4',
gasUsed: 36520,
logs: [ [Object] ],
logsBloom: '0x00000000000000000000000000000000000000000000100000000000000000000000000000000000000000000020100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000000000000000',
status: true,
to: '0xbf37994ef18281b83bb516f84a1dd6472c7756f9',
transactionHash: '0xc35f83c944a4897b39c24299484e841ab7b8097cd553d4309d3078fedbcf0f6e',
transactionIndex: 0,
rawLogs: [ [Object] ]
},
logs: [
{
address: '0xbf37994EF18281b83BB516F84a1Dd6472c7756F9',
blockNumber: 234051,
transactionHash: '0xc35f83c944a4897b39c24299484e841ab7b8097cd553d4309d3078fedbcf0f6e',
transactionIndex: 0,
blockHash: '0xe1c0d9513fbba5ea9a9ddd0e96a9f7927622aef00414321c5d472f7415ee2d85',
logIndex: 0,
removed: false,
id: 'log_0eb0822f',
event: 'LogSignature',
args: [Result]
}
]
}
{
address: '0xbf37994EF18281b83BB516F84a1Dd6472c7756F9',
blockNumber: 234051,
transactionHash: '0xc35f83c944a4897b39c24299484e841ab7b8097cd553d4309d3078fedbcf0f6e',
transactionIndex: 0,
blockHash: '0xe1c0d9513fbba5ea9a9ddd0e96a9f7927622aef00414321c5d472f7415ee2d85',
logIndex: 0,
removed: false,
id: 'log_0eb0822f',
returnValues: Result {
'0': '0xd81c6c15bb6cbed0dcfb5dcb918302e0a3021e062f3eb157b3be0aa7d6500930',
'1': '0x4fe11d27b43b92b44cf127a899b692f8f703017d97a9ef45d4ca0f7981e7cd8f',
'2': '0xea4CE501fa8b7a77486F0b8B53C25346415228E4',
docHash: '0xd81c6c15bb6cbed0dcfb5dcb918302e0a3021e062f3eb157b3be0aa7d6500930',
proof: '0x4fe11d27b43b92b44cf127a899b692f8f703017d97a9ef45d4ca0f7981e7cd8f',
signer: '0xea4CE501fa8b7a77486F0b8B53C25346415228E4'
},
event: 'LogSignature',
signature: '0x7d09bd6d32ad8f98124780a688b8ec5143e4ab9a73595bcb8ed2411dc55586cf',
raw: {
data: '0xd81c6c15bb6cbed0dcfb5dcb918302e0a3021e062f3eb157b3be0aa7d65009304fe11d27b43b92b44cf127a899b692f8f703017d97a9ef45d4ca0f7981e7cd8f000000000000000000000000ea4ce501fa8b7a77486f0b8b53c25346415228e4',
topics: [
'0x7d09bd6d32ad8f98124780a688b8ec5143e4ab9a73595bcb8ed2411dc55586cf'
]
},
args: Result {
'0': '0xd81c6c15bb6cbed0dcfb5dcb918302e0a3021e062f3eb157b3be0aa7d6500930',
'1': '0x4fe11d27b43b92b44cf127a899b692f8f703017d97a9ef45d4ca0f7981e7cd8f',
'2': '0xea4CE501fa8b7a77486F0b8B53C25346415228E4',
__length__: 3,
docHash: '0xd81c6c15bb6cbed0dcfb5dcb918302e0a3021e062f3eb157b3be0aa7d6500930',
proof: '0x4fe11d27b43b92b44cf127a899b692f8f703017d97a9ef45d4ca0f7981e7cd8f',
signer: '0xea4CE501fa8b7a77486F0b8B53C25346415228E4'
}
}
✓ returns proper address recovered from the signature (5437ms)
2 passing (11s)
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