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TransactionBuilder: extract internal signature invalidation functions for individual testing

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This commit is contained in:
Daniel Cousens 2016-09-28 16:46:35 +10:00
parent ccde09fdc3
commit 1aab317dad
1 changed files with 34 additions and 25 deletions
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59
src/transaction_builder.js
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@ -322,14 +322,7 @@ TransactionBuilder.fromTransaction = function (transaction, network) {
}
TransactionBuilder.prototype.addInput = function (txHash, vout, sequence, prevOutScript) {
// if signatures exist, adding inputs is only acceptable if SIGHASH_ANYONECANPAY is used
// throw if any signatures *didn't* use SIGHASH_ANYONECANPAY
if (!this.inputs.every(function (otherInput) {
// no signature
if (otherInput.hashType === undefined) return true
return otherInput.hashType & Transaction.SIGHASH_ANYONECANPAY
})) {
if (!this.__canModifyInputs()) {
throw new Error('No, this would invalidate signatures')
}
@ -387,23 +380,7 @@ TransactionBuilder.prototype.__addInputUnsafe = function (txHash, vout, sequence
}
TransactionBuilder.prototype.addOutput = function (scriptPubKey, value) {
var nOutputs = this.tx.outs.length
// if signatures exist, adding outputs is only acceptable if SIGHASH_NONE or SIGHASH_SINGLE is used
// throws if any signatures didn't use SIGHASH_NONE|SIGHASH_SINGLE
if (!this.inputs.every(function (input, i) {
// no signature
if (input.hashType === undefined) return true
var hashTypeMod = input.hashType & 0x1f
if (hashTypeMod === Transaction.SIGHASH_NONE) return true
if (hashTypeMod === Transaction.SIGHASH_SINGLE) {
// account for SIGHASH_SINGLE signing of a non-existing output, aka the "SIGHASH_SINGLE" bug
return i < nOutputs
}
return false
})) {
if (!this.__canModifyOutputs()) {
throw new Error('No, this would invalidate signatures')
}
@ -501,4 +478,36 @@ TransactionBuilder.prototype.sign = function (vin, keyPair, redeemScript, hashTy
if (!valid) throw new Error('Key pair cannot sign for this input')
}
TransactionBuilder.prototype.__canModifyInputs = function () {
return this.inputs.every(function (otherInput) {
// no signature
if (otherInput.hashType === undefined) return true
// if SIGHASH_ANYONECANPAY is set, signatures would not
// be invalidated by more inputs
return otherInput.hashType & Transaction.SIGHASH_ANYONECANPAY
})
}
TransactionBuilder.prototype.__canModifyOutputs = function () {
var nInputs = this.tx.ins.length
var nOutputs = this.tx.outs.length
return this.inputs.every(function (input, i) {
// any signatures?
if (input.hashType === undefined) return true
var hashTypeMod = input.hashType & 0x1f
if (hashTypeMod === Transaction.SIGHASH_NONE) return true
if (hashTypeMod === Transaction.SIGHASH_SINGLE) {
// if SIGHASH_SINGLE is set, and nInputs > nOutputs
// some signatures would be invalidated by the addition
// of more outputs
return nInputs <= nOutputs
}
return false
})
}
module.exports = TransactionBuilder