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Check redeem script matches when signing PSBT input

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This commit is contained in:
Luke Childs 2019-06-27 18:19:15 +07:00
parent 2dcac55601
commit 5fd18d806f
2 changed files with 37 additions and 6 deletions
ts_src
psbt.ts

23
ts_src/psbt.ts
View file

@ -1,5 +1,6 @@
import { Psbt as PsbtBase } from 'bip174';
import { Signer } from './ecpair';
import * as payments from './payments';
import { Transaction } from './transaction';
export class Psbt extends PsbtBase {
@ -35,19 +36,35 @@ export class Psbt extends PsbtBase {
const input = this.inputs[inputIndex];
if (input === undefined) throw new Error(`No input #${inputIndex}`);
// If a non-witness UTXO is provided, its hash must match the hash specified in the prevout
if (input.nonWitnessUtxo) {
const unsignedTx = Transaction.fromBuffer(this.globalMap.unsignedTx!);
const nonWitnessUtxoTx = Transaction.fromBuffer(input.nonWitnessUtxo);
const inputHash = unsignedTx.ins[inputIndex].hash;
const prevoutHash = unsignedTx.ins[inputIndex].hash;
const utxoHash = nonWitnessUtxoTx.getHash();
if (Buffer.compare(inputHash, utxoHash) !== 0) {
// If a non-witness UTXO is provided, its hash must match the hash specified in the prevout
if (Buffer.compare(prevoutHash, utxoHash) !== 0) {
throw new Error(
`Non-witness UTXO hash for input #${inputIndex} doesn't match the hash specified in the prevout`,
);
}
if (input.redeemScript) {
const prevoutIndex = unsignedTx.ins[inputIndex].index;
const prevout = nonWitnessUtxoTx.outs[prevoutIndex];
const redeemScriptOutput = payments.p2sh({
redeem: { output: input.redeemScript },
}).output as Buffer;
// If a redeemScript is provided, the scriptPubKey must be for that redeemScript
if (Buffer.compare(prevout.script, redeemScriptOutput) !== 0) {
throw new Error(
`Redeem script for input #${inputIndex} doesn't match the scriptPubKey in the prevout`,
);
}
}
}
// TODO: Get hash to sign