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accurate hasStandardInputs.

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This commit is contained in:
Christopher Jeffrey 2016-03-30 14:20:02 -07:00
parent ae2a5fb702
commit 0720c6c64a
2 changed files with 15 additions and 98 deletions
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14
lib/bcoin/script.js
View File

@ -73,6 +73,10 @@ Witness.prototype.isScripthashInput = function isScripthashInput(redeem) {
return Script.isScripthashInput(this.items, redeem, true);
};
Witness.prototype.isNonstandardInput = function isNonstandardInput(prev) {
return Script.isNonstandardInput(this.items, prev, true);
};
Witness.prototype.getRedeem = function getRedeem() {
if (!this.redeem)
this.redeem = Script.getRedeem(this.items);
@ -1402,7 +1406,7 @@ Script.prototype.getType = function getType() {
|| 'unknown';
};
Script.prototype.isUnknown = function isUnknown() {
Script.prototype.isNonstandard = function isNonstandard() {
return this.getType() === 'unknown';
};
@ -1787,8 +1791,12 @@ Script.getInputType = function getInputType(code, prev, isWitness) {
return type;
};
Script.prototype.isInputUnknown = function isInputUnknown() {
return this.getInputType() === 'unknown';
Script.prototype.isNonstandardInput = function isNonstandardInput(prev) {
return Script.isNonstandardInput(this.code, prev, false);
};
Script.isNonstandardInput = function isNonstandardInput(code, prev, isWitness) {
return Script.getInputType(code, prev, isWitness) === 'unknown';
};
Script.createOutputScript = function(options) {

99
lib/bcoin/tx.js
View File

@ -890,100 +890,6 @@ TX.prototype.isStandard = function isStandard(flags, ts, height, ret) {
// AreInputsStandard
TX.prototype.hasStandardInputs = function hasStandardInputs(flags) {
var maxSigops = constants.script.maxScripthashSigops;
var i, input, args, stack, res, redeem, targs;
if (flags == null)
flags = constants.flags.STANDARD_VERIFY_FLAGS;
if (this.isCoinbase())
return true;
for (i = 0; i < this.inputs.length; i++) {
input = this.inputs[i];
if (!input.coin)
return false;
if ((flags & constants.flags.VERIFY_WITNESS)
&& input.coin.script.isWitnessProgram()) {
// Input script must be empty.
if (input.script.code.length !== 0)
return false;
// Verify the program in the output script
if (!input.coin.script.isStandardProgram(input.witness, flags))
return false;
continue;
}
args = input.coin.script.getArgs();
if (args < 0)
return false;
// Not accurate:
// Failsafe to avoid getting dos'd in case we ever
// call hasStandardInputs before isStandard.
if (!input.script.isPushOnly())
return false;
stack = new Stack([]);
res = input.script.execute(stack, flags, this, i, 0);
if (!res)
return false;
if ((flags & constants.flags.VERIFY_P2SH)
&& input.coin.script.isScripthash()) {
if (stack.length === 0)
return false;
redeem = stack.getRedeem(false);
if (!redeem)
return false;
if ((flags & constants.flags.VERIFY_WITNESS)
&& redeem.isWitnessProgram()) {
// Input script must be exactly one push of the redeem script.
if (!(input.script.code.length === 1
&& utils.isEqual(input.script.code[0], redeem.raw))) {
return false;
}
// Verify the program in the redeem script
if (!redeem.isStandardProgram(input.witness, flags))
return false;
continue;
}
if (redeem.isUnknown()) {
if (redeem.getSigops(true) > maxSigops)
return false;
continue;
}
targs = redeem.getArgs();
if (targs < 0)
return false;
args += targs;
}
if (stack.length !== args)
return false;
}
return true;
};
// AreInputsStandard (segwit branch)
TX.prototype.hasStandardInputsWitness = function hasStandardInputsWitness(flags) {
var maxSigops = constants.script.maxScripthashSigops;
var i, input, stack, res, redeem;
@ -999,6 +905,9 @@ TX.prototype.hasStandardInputsWitness = function hasStandardInputsWitness(flags)
if (!input.coin)
return false;
if (input.coin.script.isNonstandard())
return false;
if ((flags & constants.flags.VERIFY_P2SH)
&& input.coin.script.isScripthash()) {
// Not accurate:
@ -1009,7 +918,7 @@ TX.prototype.hasStandardInputsWitness = function hasStandardInputsWitness(flags)
stack = new Stack([]);
res = input.script.execute(stack, flags, this, i, 0);
res = input.script.execute(stack, constants.flags.VERIFY_NONE, this, i, 0);
if (!res)
return false;