5cf44275c8 test: refactor: deduplicate legacy ECDSA signing for tx inputs (Sebastian Falbesoner)
Pull request description:
There are several instances in functional tests and the framework (MiniWallet, feature_block.py, p2p_segwit.py) where we create a legacy ECDSA signature for a certain transaction's input by doing the following steps:
1. calculate the `LegacySignatureHash` with the desired sighash type
2. create the actual digital signature by calling `ECKey.sign_ecdsa` on the signature message hash calculated above
3. put the DER-encoded result as CScript data push into tx input's scriptSig
Create a new helper `sign_input_legacy` which hides those details and takes only the necessary parameters (tx, input index, relevant scriptPubKey, private key, sighash type [SIGHASH_ALL by default]). For further convenience, the signature is prepended to already existing data-pushes in scriptSig, in order to avoid rehashing the transaction after calling the new signing function.
ACKs for top commit:
dimitaracev:
ACK `5cf4427`
achow101:
ACK 5cf44275c8
pinheadmz:
ACK 5cf44275c8
Tree-SHA512: 8f0e4fb2c3e0f84fac5dbc4dda87973276242b0f628034272a7f3e45434c1e17dd1b26a37edfb302dcaf380dbfe98b0417391ace5e0ac9720155d8fba702031e
357e3f6aa4