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57 lines
2.4 KiB
Python
Executable File
57 lines
2.4 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2019-2020 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Useful Script constants and utils."""
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from test_framework.script import CScript, hash160, OP_DUP, OP_HASH160, OP_CHECKSIG, OP_EQUAL, OP_EQUALVERIFY
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# To prevent a "tx-size-small" policy rule error, a transaction has to have a
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# size of at least 83 bytes (MIN_STANDARD_TX_SIZE in
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# src/policy/policy.h). Considering a Tx with the smallest possible single
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# input (blank, empty scriptSig), and with an output omitting the scriptPubKey,
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# we get to a minimum size of 60 bytes:
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#
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# Tx Skeleton: 4 [Version] + 1 [InCount] + 1 [OutCount] + 4 [LockTime] = 10 bytes
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# Blank Input: 32 [PrevTxHash] + 4 [Index] + 1 [scriptSigLen] + 4 [SeqNo] = 41 bytes
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# Output: 8 [Amount] + 1 [scriptPubKeyLen] = 9 bytes
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#
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# Hence, the scriptPubKey of the single output has to have a size of at
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# least 23 bytes, which corresponds to the size of a P2SH scriptPubKey.
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# The following script constant consists of a single push of 22 bytes of 'a':
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# <PUSH_22> <22-bytes of 'a'>
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# resulting in a 23-byte size. It should be used whenever (small) fake
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# scriptPubKeys are needed, to guarantee that the minimum transaction size is
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# met.
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DUMMY_P2SH_SCRIPT = CScript([b'a' * 22])
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DUMMY_2_P2SH_SCRIPT = CScript([b'b' * 22])
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def keyhash_to_p2pkh_script(hash, main = False):
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assert len(hash) == 20
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return CScript([OP_DUP, OP_HASH160, hash, OP_EQUALVERIFY, OP_CHECKSIG])
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def scripthash_to_p2sh_script(hash, main = False):
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assert len(hash) == 20
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return CScript([OP_HASH160, hash, OP_EQUAL])
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def key_to_p2pkh_script(key, main = False):
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key = check_key(key)
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return keyhash_to_p2pkh_script(hash160(key), main)
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def script_to_p2sh_script(script, main = False):
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script = check_script(script)
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return scripthash_to_p2sh_script(hash160(script), main)
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def check_key(key):
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if isinstance(key, str):
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key = bytes.fromhex(key) # Assuming this is hex string
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if isinstance(key, bytes) and (len(key) == 33 or len(key) == 65):
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return key
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assert False
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def check_script(script):
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if isinstance(script, str):
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script = bytes.fromhex(script) # Assuming this is hex string
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if isinstance(script, bytes) or isinstance(script, CScript):
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return script
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assert False
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