def is_minikey(text):
# Minikeys are typically 22 or 30 characters, but this routine
# permits any length of 20 or more provided the minikey is valid.
# A valid minikey must begin with an 'S', be in base58, and when
# suffixed with '?' have its SHA256 hash begin with a zero byte.
# They are widely used in Casascius physical bitoins.
return (len(text) >= 20 and text[0] == 'S'
and all(c in __b58chars for c in text)
and ord(sha256(text + '?')[0]) == 0)
def get_bytes(self, n):
while len(self.pool) < n:
self.pool.extend(self.sha)
self.sha = sha256(self.sha)
result, self.pool = self.pool[:n], self.pool[n:]
return result
def __init__(self, seed):
self.sha = sha256(seed)
self.pool = bytearray()
def minikey_to_private_key(text):
return sha256(text)
def test_create_txid(self):
_tx_sha256 = sha256(sha256(raw_tx.decode('hex')))
_tx_hex = _tx_sha256[::-1].encode('hex')
self.assertEqual(_tx_hex, tx_id)
