Sign Ethereum transactions offline using Node-RED

I am trying to create a flow in Node-RED to sign for Etherem transactions (in this primary case, just messages) off-line and am struggling.

I have a Python code working fine (meaning doing well this off-line signing) and posting via an API but the Node-RED is not happy doing what I want (it returns a different signature than the one I get on the Web3.py and thus the EVM reverts the transaction).

Can anyone help? I tried several approaches, including the ones commented out, but none will match the signature generated at the Python code...

PS - the Python code implements it with signed_hash = self.web3.eth.account.signHash(hash, self._fetch_signer_key())

Thanks!

var Web3 = global.get('web3');

var web3 = new Web3();



var account = "0x9EfEe29e8fDf2cXXXXXXXde5502ABDf3f13ADac9a";

var privateKey = "0xbde16f62dadb43dad898e182e4e798baXXXXae46458d4939361d2494e11ce9e4";

var password = "12XXX8";



var message = "SMX1 10 1527596375";

var _hash = web3.utils.sha3(message);



//var signedObject = web3.eth.accounts.sign(_hash, privateKey);

var signedObject = web3.eth.accounts.sign(message, account);

//var signedObject = web3.eth.personal.sign(message, account, password);

//const signature = web3.eth.sign(message,account);



var msg = {};

msg.payload = { 

 //"message": message,

 "message": signedObject.message,

 "hash": _hash,

 //"hash": signedObject.messageHash,

 "signature": web3.utils.toHex(signedObject.signature),

 //"signature": web3.eth.personal.sign(message, account, password),

 "identity": identity,

};



/*

//msg.payload = signedObject.message;

msg.payload.message = signedObject.message;

msg.payload.hash = signedObject.messageHash;

msg.payload.signature = signedObject.signature;

msg.payload.identity = identity;

*/



//return signedObject.messageHash;

//return msg;

return signedObject;

edited Nov 20 '18 at 7:48

hardillb

23.8k73060

asked Nov 19 '18 at 15:15

epm-bt

214

Neither do the hashes match...
– epm-bt
Nov 19 '18 at 16:27

1

If the hashes don't match, then it doesn't make sense to go any further. First determine why the hashes don't match. (If you need help, provide the code you're using to generate the hash in both cases. I believe the JavaScript code is already there, but we're lacking the code in Python that computes the hash.)
– smarx
Nov 19 '18 at 17:22

Hi smarx, thanks for getting in touch! The Python code is as simple as the snippet provided previously. Anyway, there is the complete code... def sign_message(self, message): if not isinstance(message, str): raise TypeError('Message must be of type <str>') hash = Web3.sha3(text=message) signed_hash = self.web3.eth.account.signHash(hash, privateKey) return signed_hash
– epm-bt
Nov 20 '18 at 9:39

1

But you said the hash doesn't match in the first place, so the problem is presumably before signHash. Unless I'm missing what you mean?
– smarx
Nov 20 '18 at 12:24

1

I'm having a really hard time following this thread, so I'm going to bow out. (It seems like this question has been resolved anyway.)
– smarx
Nov 20 '18 at 14:26

|
show 3 more comments

I am trying to create a flow in Node-RED to sign for Etherem transactions (in this primary case, just messages) off-line and am struggling.

Can anyone help? I tried several approaches, including the ones commented out, but none will match the signature generated at the Python code...

PS - the Python code implements it with signed_hash = self.web3.eth.account.signHash(hash, self._fetch_signer_key())

Thanks!

var Web3 = global.get('web3');

var web3 = new Web3();



var account = "0x9EfEe29e8fDf2cXXXXXXXde5502ABDf3f13ADac9a";

var privateKey = "0xbde16f62dadb43dad898e182e4e798baXXXXae46458d4939361d2494e11ce9e4";

var password = "12XXX8";



var message = "SMX1 10 1527596375";

var _hash = web3.utils.sha3(message);



//var signedObject = web3.eth.accounts.sign(_hash, privateKey);

var signedObject = web3.eth.accounts.sign(message, account);

//var signedObject = web3.eth.personal.sign(message, account, password);

//const signature = web3.eth.sign(message,account);



var msg = {};

msg.payload = { 

 //"message": message,

 "message": signedObject.message,

 "hash": _hash,

 //"hash": signedObject.messageHash,

 "signature": web3.utils.toHex(signedObject.signature),

 //"signature": web3.eth.personal.sign(message, account, password),

 "identity": identity,

};



/*

//msg.payload = signedObject.message;

msg.payload.message = signedObject.message;

msg.payload.hash = signedObject.messageHash;

msg.payload.signature = signedObject.signature;

msg.payload.identity = identity;

*/



//return signedObject.messageHash;

//return msg;

return signedObject;

edited Nov 20 '18 at 7:48

hardillb

23.8k73060

asked Nov 19 '18 at 15:15

epm-bt

214

Neither do the hashes match...
– epm-bt
Nov 19 '18 at 16:27

1

If the hashes don't match, then it doesn't make sense to go any further. First determine why the hashes don't match. (If you need help, provide the code you're using to generate the hash in both cases. I believe the JavaScript code is already there, but we're lacking the code in Python that computes the hash.)
– smarx
Nov 19 '18 at 17:22

Hi smarx, thanks for getting in touch! The Python code is as simple as the snippet provided previously. Anyway, there is the complete code... def sign_message(self, message): if not isinstance(message, str): raise TypeError('Message must be of type <str>') hash = Web3.sha3(text=message) signed_hash = self.web3.eth.account.signHash(hash, privateKey) return signed_hash
– epm-bt
Nov 20 '18 at 9:39

1

But you said the hash doesn't match in the first place, so the problem is presumably before signHash. Unless I'm missing what you mean?
– smarx
Nov 20 '18 at 12:24

1

I'm having a really hard time following this thread, so I'm going to bow out. (It seems like this question has been resolved anyway.)
– smarx
Nov 20 '18 at 14:26

|
show 3 more comments

I am trying to create a flow in Node-RED to sign for Etherem transactions (in this primary case, just messages) off-line and am struggling.

Can anyone help? I tried several approaches, including the ones commented out, but none will match the signature generated at the Python code...

PS - the Python code implements it with signed_hash = self.web3.eth.account.signHash(hash, self._fetch_signer_key())

Thanks!

var Web3 = global.get('web3');

var web3 = new Web3();



var account = "0x9EfEe29e8fDf2cXXXXXXXde5502ABDf3f13ADac9a";

var privateKey = "0xbde16f62dadb43dad898e182e4e798baXXXXae46458d4939361d2494e11ce9e4";

var password = "12XXX8";



var message = "SMX1 10 1527596375";

var _hash = web3.utils.sha3(message);



//var signedObject = web3.eth.accounts.sign(_hash, privateKey);

var signedObject = web3.eth.accounts.sign(message, account);

//var signedObject = web3.eth.personal.sign(message, account, password);

//const signature = web3.eth.sign(message,account);



var msg = {};

msg.payload = { 

 //"message": message,

 "message": signedObject.message,

 "hash": _hash,

 //"hash": signedObject.messageHash,

 "signature": web3.utils.toHex(signedObject.signature),

 //"signature": web3.eth.personal.sign(message, account, password),

 "identity": identity,

};



/*

//msg.payload = signedObject.message;

msg.payload.message = signedObject.message;

msg.payload.hash = signedObject.messageHash;

msg.payload.signature = signedObject.signature;

msg.payload.identity = identity;

*/



//return signedObject.messageHash;

//return msg;

return signedObject;

edited Nov 20 '18 at 7:48

hardillb

23.8k73060

asked Nov 19 '18 at 15:15

epm-bt

214

I am trying to create a flow in Node-RED to sign for Etherem transactions (in this primary case, just messages) off-line and am struggling.

Can anyone help? I tried several approaches, including the ones commented out, but none will match the signature generated at the Python code...

PS - the Python code implements it with signed_hash = self.web3.eth.account.signHash(hash, self._fetch_signer_key())

Thanks!

var Web3 = global.get('web3');

var web3 = new Web3();



var account = "0x9EfEe29e8fDf2cXXXXXXXde5502ABDf3f13ADac9a";

var privateKey = "0xbde16f62dadb43dad898e182e4e798baXXXXae46458d4939361d2494e11ce9e4";

var password = "12XXX8";



var message = "SMX1 10 1527596375";

var _hash = web3.utils.sha3(message);



//var signedObject = web3.eth.accounts.sign(_hash, privateKey);

var signedObject = web3.eth.accounts.sign(message, account);

//var signedObject = web3.eth.personal.sign(message, account, password);

//const signature = web3.eth.sign(message,account);



var msg = {};

msg.payload = { 

 //"message": message,

 "message": signedObject.message,

 "hash": _hash,

 //"hash": signedObject.messageHash,

 "signature": web3.utils.toHex(signedObject.signature),

 //"signature": web3.eth.personal.sign(message, account, password),

 "identity": identity,

};



/*

//msg.payload = signedObject.message;

msg.payload.message = signedObject.message;

msg.payload.hash = signedObject.messageHash;

msg.payload.signature = signedObject.signature;

msg.payload.identity = identity;

*/



//return signedObject.messageHash;

//return msg;

return signedObject;

ethereum node-red web3js

edited Nov 20 '18 at 7:48

hardillb

23.8k73060

asked Nov 19 '18 at 15:15

epm-bt

214

edited Nov 20 '18 at 7:48

hardillb

23.8k73060

asked Nov 19 '18 at 15:15

epm-bt

214

edited Nov 20 '18 at 7:48

hardillb

23.8k73060

edited Nov 20 '18 at 7:48

hardillb

23.8k73060

edited Nov 20 '18 at 7:48

hardillb

23.8k73060

asked Nov 19 '18 at 15:15

epm-bt

214

asked Nov 19 '18 at 15:15

epm-bt

214

asked Nov 19 '18 at 15:15

epm-bt

214

Neither do the hashes match...
– epm-bt
Nov 19 '18 at 16:27

1

If the hashes don't match, then it doesn't make sense to go any further. First determine why the hashes don't match. (If you need help, provide the code you're using to generate the hash in both cases. I believe the JavaScript code is already there, but we're lacking the code in Python that computes the hash.)
– smarx
Nov 19 '18 at 17:22

Hi smarx, thanks for getting in touch! The Python code is as simple as the snippet provided previously. Anyway, there is the complete code... def sign_message(self, message): if not isinstance(message, str): raise TypeError('Message must be of type <str>') hash = Web3.sha3(text=message) signed_hash = self.web3.eth.account.signHash(hash, privateKey) return signed_hash
– epm-bt
Nov 20 '18 at 9:39

1

But you said the hash doesn't match in the first place, so the problem is presumably before signHash. Unless I'm missing what you mean?
– smarx
Nov 20 '18 at 12:24

1

I'm having a really hard time following this thread, so I'm going to bow out. (It seems like this question has been resolved anyway.)
– smarx
Nov 20 '18 at 14:26

|
show 3 more comments

Neither do the hashes match...
– epm-bt
Nov 19 '18 at 16:27

1

If the hashes don't match, then it doesn't make sense to go any further. First determine why the hashes don't match. (If you need help, provide the code you're using to generate the hash in both cases. I believe the JavaScript code is already there, but we're lacking the code in Python that computes the hash.)
– smarx
Nov 19 '18 at 17:22

Hi smarx, thanks for getting in touch! The Python code is as simple as the snippet provided previously. Anyway, there is the complete code... def sign_message(self, message): if not isinstance(message, str): raise TypeError('Message must be of type <str>') hash = Web3.sha3(text=message) signed_hash = self.web3.eth.account.signHash(hash, privateKey) return signed_hash
– epm-bt
Nov 20 '18 at 9:39

1

But you said the hash doesn't match in the first place, so the problem is presumably before signHash. Unless I'm missing what you mean?
– smarx
Nov 20 '18 at 12:24

1

I'm having a really hard time following this thread, so I'm going to bow out. (It seems like this question has been resolved anyway.)
– smarx
Nov 20 '18 at 14:26

Neither do the hashes match...
– epm-bt
Nov 19 '18 at 16:27

If the hashes don't match, then it doesn't make sense to go any further. First determine why the hashes don't match. (If you need help, provide the code you're using to generate the hash in both cases. I believe the JavaScript code is already there, but we're lacking the code in Python that computes the hash.)
– smarx
Nov 19 '18 at 17:22

Hi smarx, thanks for getting in touch! The Python code is as simple as the snippet provided previously. Anyway, there is the complete code... def sign_message(self, message): if not isinstance(message, str): raise TypeError('Message must be of type <str>') hash = Web3.sha3(text=message) signed_hash = self.web3.eth.account.signHash(hash, privateKey) return signed_hash
– epm-bt
Nov 20 '18 at 9:39

But you said the hash doesn't match in the first place, so the problem is presumably before signHash. Unless I'm missing what you mean?
– smarx
Nov 20 '18 at 12:24

I'm having a really hard time following this thread, so I'm going to bow out. (It seems like this question has been resolved anyway.)
– smarx
Nov 20 '18 at 14:26

|
show 3 more comments

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