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Save dcb9/385631846097e1f59e3cba3b1d42f3ed to your computer and use it in GitHub Desktop.
| package main | |
| import ( | |
| "fmt" | |
| "github.com/ethereum/go-ethereum/accounts" | |
| "github.com/ethereum/go-ethereum/common/hexutil" | |
| "github.com/ethereum/go-ethereum/crypto" | |
| ) | |
| func main() { | |
| fmt.Println(verifySig( | |
| "0x0EaE3eF6CC7176553E6B45d94e9eFDE2Da7B82a5", | |
| "0x34850b7e36e635783df0563c7202c3ac776df59db5015d2b6f0add33955bb5c43ce35efb5ce695a243bc4c5dc4298db40cd765f3ea5612d2d57da1e4933b2f201b", | |
| []byte("Example `personal_sign` message"), | |
| )) | |
| } | |
| func verifySig(from, sigHex string, msg []byte) bool { | |
| sig := hexutil.MustDecode(sigHex) | |
| msg = accounts.TextHash(msg) | |
| if sig[crypto.RecoveryIDOffset] == 27 || sig[crypto.RecoveryIDOffset] == 28 { | |
| sig[crypto.RecoveryIDOffset] -= 27 // Transform yellow paper V from 27/28 to 0/1 | |
| } | |
| recovered, err := crypto.SigToPub(msg, sig) | |
| if err != nil { | |
| return false | |
| } | |
| recoveredAddr := crypto.PubkeyToAddress(*recovered) | |
| return from == recoveredAddr.Hex() | |
| } |
Helped a lot cheers !
Works fine but I need to replace
sig[crypto.RecoveryIDOffset] -= 27 // Transform yellow paper V from 27/28 to 0/1with
if sig[crypto.RecoveryIDOffset] == 27 || sig[crypto.RecoveryIDOffset] == 28 {
sig[crypto.RecoveryIDOffset] -= 27 // Transform yellow paper V from 27/28 to 0/1
}
Amazing! Worked on the first go!
OMG You're the absolute life saver! Thanks a lot! Spent up all night long but couldn't find the right answer until seeing this post!
In our case, the last line had a bug, in which it needs the address to be lower cased, otherwise the comparison fails. Fix this bug lowering the case of the right parameter, like this:
return from == strings.ToLower(recoveredAddress.Hex())
+1
@psmithson
in that case you should use something like
return strings.ToLower(from) == strings.ToLower(recoveredAddress.Hex())
@psmithson in that case you should use something like
return strings.ToLower(from) == strings.ToLower(recoveredAddress.Hex())
or even better
return strings.EqualFold(from, recoveredAddr.Hex())
Very helpful!
here's another example:
https://github.com/verity-team/dws/blob/main/internal/delphi/server/server.go#L127
Sign in with Ethereum - frontend
https://docs.metamask.io/wallet/how-to/sign-data/siwe/
Signature checker in backend with go-ethereum with this code.
@valterlobo Very useful, thanks for sharing
Thanks for your solution!!!!
Do you have any examples on generating the signature?