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drop unoptimized sighashing.

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This commit is contained in:
Christopher Jeffrey 2016-06-30 08:11:43 -07:00
parent 0a9ce90b84
commit c7b9091da0
No known key found for this signature in database
GPG Key ID: 8962AB9DE6666BBD
1 changed files with 0 additions and 103 deletions
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lib/bcoin/tx.js
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@ -480,109 +480,6 @@ TX.prototype.signatureHash = function signatureHash(index, prev, type, version)
* @returns {Buffer} * @returns {Buffer}
*/ */
TX.prototype.signatureHashCopy = function signatureHashV0(index, prev, type) {
var p = new BufferWriter();
var empty = new Script();
var i, copy, input, output;
if (typeof index !== 'number')
index = this.inputs.indexOf(index);
if (typeof type === 'string')
type = constants.hashType[type.toUpperCase()];
assert(index >= 0 && index < this.inputs.length);
assert(prev instanceof Script);
// Clone the transaction.
copy = new TX();
copy.version = this.version;
for (i = 0; i < this.inputs.length; i++) {
input = new bcoin.input();
input.prevout = this.inputs[i].prevout;
input.script = this.inputs[i].script;
input.sequence = this.inputs[i].sequence;
copy.inputs.push(input);
}
for (i = 0; i < this.outputs.length; i++) {
output = new bcoin.output();
output.value = this.outputs[i].value;
output.script = this.outputs[i].script;
copy.outputs.push(output);
}
copy.locktime = this.locktime;
// Remove all signatures.
for (i = 0; i < copy.inputs.length; i++)
copy.inputs[i].script = empty;
// Remove all code separators.
prev = prev.removeSeparators();
// Set our input to previous output's script
copy.inputs[index].script = prev;
if ((type & 0x1f) === constants.hashType.NONE) {
// Drop all outputs. We don't want to sign them.
copy.outputs.length = 0;
// Allow input sequence updates for other inputs.
for (i = 0; i < copy.inputs.length; i++) {
if (i !== index)
copy.inputs[i].sequence = 0;
}
} else if ((type & 0x1f) === constants.hashType.SINGLE) {
// Bitcoind used to return 1 as an error code:
// it ended up being treated like a hash.
if (index >= copy.outputs.length)
return utils.copy(constants.ONE_HASH);
// Drop all the outputs after the input index.
copy.outputs.length = index + 1;
// Null outputs that are not the at current input index.
for (i = 0; i < copy.outputs.length; i++) {
if (i !== index) {
copy.outputs[i].script = empty;
copy.outputs[i].value = -1;
}
}
// Allow input sequence updates for other inputs.
for (i = 0; i < copy.inputs.length; i++) {
if (i !== index)
copy.inputs[i].sequence = 0;
}
}
// Only sign our input. Allows anyone to add inputs.
if (type & constants.hashType.ANYONECANPAY) {
copy.inputs[0] = copy.inputs[index];
copy.inputs.length = 1;
}
// Render the copy and append the hashtype.
copy.toRaw(p);
p.writeU32(type);
return utils.hash256(p.render());
};
/**
* Legacy sighashing -- O(n^2).
* Note: Optimized version. No
* transaction copy necessary.
* @private
* @param {Number} index
* @param {Script} prev
* @param {SighashType} type
* @returns {Buffer}
*/
TX.prototype.signatureHashV0 = function signatureHashV0(index, prev, type) { TX.prototype.signatureHashV0 = function signatureHashV0(index, prev, type) {
var i, input, output; var i, input, output;
var p = new BufferWriter(); var p = new BufferWriter();