Solana, verify a signature with python

Question

I'm trying to authenticate users via the phantom wallet but I cannot verify the signature on the backend. Here's my frontend code:

const response = await solana.connect(); console.log("wallet account ", response.publicKey.toString()); setWalletKey(response.publicKey.toString()); const message = new TextEncoder().encode("hello"); const signature = await solana.signMessage(message); const resp_backend = await Axios.post("http://localhost:8000/api/auth/",{message:"hello", pub_key:response.publicKey.toString(), signature:bs58.encode(signature.signature)})

And the backend on Django:

from nacl.signing import VerifyKey import base58 from solders.pubkey import Pubkey def verify_signature_for_user(public_key, signature, message): pub_key = Pubkey(public_key) print(len(public_key)) msg = bytes(message, encoding='utf-8') signed = bytes(signature, 'utf-8') result = VerifyKey(pub_key).verify(smessage=msg, signature=base58.b58decode(signed)) return result

I'm getting the below error:

ValueError: expected a sequence of length 32 (got 44)

Any ideas on how to fix this?

Lukas Velikov · Accepted Answer · 2023-04-15 07:15:01Z

3

If you're passing in a string, you have to convert it

pub_key = Pubkey.from_string(public_key)

edited Apr 15, 2023 at 7:15

Lukas Velikov

6606 silver badges17 bronze badges

answered Apr 11, 2023 at 6:58

Tamgros

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1 Comment

Hans Over a year ago

It is more great answer than me!

Hans · Accepted Answer · 2023-04-11 06:27:49Z

In "pubkey class" (from solders.pubkey import Pubkey), we can see the bytes based init value below (pubkey.pyi).

from typing import ClassVar, Sequence, Tuple, Union class Pubkey: LENGTH: ClassVar[int] def __init__(self, pubkey_bytes: Union[bytes, Sequence[int]]) -> None: ... @staticmethod def new_unique() -> "Pubkey": ...

In the solana, pubkey can be Uint8Array(32) and that this array can make with base58 library. So, If you fix this point, the code will be work well.

import base58 _pub_key = base58.b58decode(public_key) pub_key = Pubkey(_pub_key)

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