def add_in_transaction(self, tx_hash, index: int, keys: KeysBTC):
"""Add an input to the transaction"""
# Convert tx_hash to bytes if it's str
tx_hash = bytes.fromhex(tx_hash) \
if isinstance(tx_hash, str) else tx_hash
# Init a dictionary for an input
tx_in = {}
# Previous transaction hash -- tx_hash
tx_in["previous_tx_hash"] = tx_hash[::-1]
# Output point index -- index
tx_in["previous_txout_index"] = struct.pack("<L", index)
# Temporary signature script = output script
# Generate a script with BTC-address for -- keys
tx_in["script_sig"] = self.get_script_p2pkh(keys.get_pubkey_hash())
# Temporary signature script length
tx_in["script_length"] = struct.pack("<B", len(tx_in["script_sig"]))
# Sequence 0xFFFFFFFF
tx_in["sequence"] = b"\xff\xff\xff\xff"
# Set a KeysBTC object using to sign this input
tx_in["keys"] = keys
# Add the dictionary with the input to the transaction
self.ins[len(self.ins)] = tx_in
return
if __name__ == "__main__":
from btc.utils import sha256
from btc.keys import KeysBTC
k = KeysBTC("96a69d6682a4b2eb522e896c2fa1b8ada485c472b983e27266d1d5c8c77ec374")
# Check the right values at https://www.bitaddress.org
# An object methods
print("Private key (hex): ", k.get_private_key_hex())
print("Private key (WIF-compressed): ", k.get_private_key_wif(True))
print("Private key (WIF-uncompressed): ", k.get_private_key_wif(False))
print("Public point: ", k.get_public_point())
print("Public key (hex): ", k.get_public_key(compressed=True).hex(),)
print("Is public key compressed: ", k.is_pubkey_compressed())
print("Public key HASH160: ", k.get_pubkey_hash().hex())
print("Address: ", k.get_address())
# Static methods (convertions)
print("Generator point: ", k.get_generator_point())
print("Private key to WIF: ", k.privatekey_to_wif(k._private_key, compressed=False))
print("WIF to private key", k.privatekey_from_wif(k.get_private_key_wif()).hex())
print(k.address_to_pubkey_hash(k.get_address()).hex())
# Sign and verify
message = sha256(b"sample")
r, s = k.sign(message)
print(k.verify(message, r, s))