from Crypto.PublicKey import ECC
from Crypto.Hash import SHA256
from Crypto.Signature import DSS
import base58


class Signer:
    def __init__(self, seed: bytes):
        if len(seed) != 32:
            raise ValueError("Seed must be 32 bytes")

        self.key = ECC.generate(curve='P-256', randfunc=lambda n: seed)
        self.verifier = DSS.new(self.key, 'fips-186-3')

    def sign(self, data_bytes: bytes) -> str:
        hash_obj = SHA256.new(data_bytes)
        signature = self.verifier.sign(hash_obj)
        signature_str = base58.b58encode(signature).decode()
        return signature_str

    def verify(self, data_bytes: str, signature: str) -> bool:
        data_bytes = base58.b58decode(data_bytes)
        signature_bytes = base58.b58decode(signature)
        hash_obj = SHA256.new(data_bytes)
        try:
            self.verifier.verify(hash_obj, signature_bytes)
            return True
        except ValueError:
            return False