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Add Script conversion method p2wpkh_script_code #954

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merged 1 commit into from Apr 20, 2022
Merged

Add Script conversion method p2wpkh_script_code #954

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19 changes: 19 additions & 0 deletions src/blockdata/script.rs
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Expand Up @@ -427,6 +427,25 @@ impl Script {
Script::new_p2sh(&self.script_hash())
}

/// Returns the script code used for spending a P2WPKH output if this script is a script pubkey
/// for a P2WPKH output. The `scriptCode` is described in [BIP143].
///
/// [BIP143]: <https://github.com/bitcoin/bips/blob/99701f68a88ce33b2d0838eb84e115cef505b4c2/bip-0143.mediawiki>
pub fn p2wpkh_script_code(&self) -> Option<Script> {
if !self.is_v0_p2wpkh() {
return None
}
let script = Builder::new()
.push_opcode(opcodes::all::OP_DUP)
.push_opcode(opcodes::all::OP_HASH160)
.push_slice(&self[2..]) // The `self` script is 0x00, 0x14, <pubkey_hash>
.push_opcode(opcodes::all::OP_EQUALVERIFY)
.push_opcode(opcodes::all::OP_CHECKSIG)
.into_script();

Some(script)
}

/// Computes the P2WSH output corresponding to this witnessScript (aka the "witness redeem
/// script").
pub fn to_v0_p2wsh(&self) -> Script {
Expand Down