import electrum
import ecdsa
import base64
import hashlib
from electrum import SECP256k1

from ecdsa.curves import curves
curves.append(SECP256k1)

privkey_pem = '''-----BEGIN EC PRIVATE KEY-----
MHQCAQEEIEYfyzvUn+PhkgCAFjppmfOhsTtvxmiwgM0xdwt+aaOroAcGBSuBBAAK
oUQDQgAEE/ju0/aNCJAXefHLOQ7khd+vr1vBZ7gipGVPjdc57tWkKlDuv3ecfy1v
YWOh6CM0CNkmFbSxul7arpwDIh441A==
-----END EC PRIVATE KEY-----'''

pubkey_pem = '''-----BEGIN PUBLIC KEY-----
MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAEE/ju0/aNCJAXefHLOQ7khd+vr1vBZ7gi
pGVPjdc57tWkKlDuv3ecfy1vYWOh6CM0CNkmFbSxul7arpwDIh441A==
-----END PUBLIC KEY-----'''

data = hashlib.sha256('Some data to sign').digest()

# Signing data using privkey
private_key = ecdsa.SigningKey.from_pem(privkey_pem)
public_key = private_key.get_verifying_key()
signature = private_key.sign_digest(data, sigencode=ecdsa.util.sigencode_der)
print base64.b64encode(signature)

# Verifying signed data using pubkey
ecdsa.VerifyingKey.from_pem(pubkey_pem)
print public_key.verify_digest(signature, data, sigdecode=ecdsa.util.sigdecode_der)