cbda064842
This commit contains the entire btcscript repository along with several changes needed to move all of the files into the txscript directory in order to prepare it for merging. This does NOT update btcd or any of the other packages to use the new location as that will be done separately. - All import paths in the old btcscript test files have been changed to the new location - All references to btcscript as the package name have been chagned to txscript This is ongoing work toward #214.
91 lines
2.9 KiB
Go
91 lines
2.9 KiB
Go
// Copyright (c) 2013-2015 Conformal Systems LLC.
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package txscript
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import (
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"github.com/btcsuite/btcnet"
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"github.com/btcsuite/btcutil"
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)
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// ExtractPkScriptAddrs returns the type of script, addresses and required
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// signatures associated with the passed PkScript. Note that it only works for
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// 'standard' transaction script types. Any data such as public keys which are
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// invalid are omitted from the results.
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func ExtractPkScriptAddrs(pkScript []byte, net *btcnet.Params) (ScriptClass, []btcutil.Address, int, error) {
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var addrs []btcutil.Address
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var requiredSigs int
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// No valid addresses or required signatures if the script doesn't
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// parse.
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pops, err := parseScript(pkScript)
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if err != nil {
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return NonStandardTy, nil, 0, err
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}
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scriptClass := typeOfScript(pops)
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switch scriptClass {
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case PubKeyHashTy:
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// A pay-to-pubkey-hash script is of the form:
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// OP_DUP OP_HASH160 <hash> OP_EQUALVERIFY OP_CHECKSIG
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// Therefore the pubkey hash is the 3rd item on the stack.
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// Skip the pubkey hash if it's invalid for some reason.
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requiredSigs = 1
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addr, err := btcutil.NewAddressPubKeyHash(pops[2].data, net)
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if err == nil {
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addrs = append(addrs, addr)
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}
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case PubKeyTy:
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// A pay-to-pubkey script is of the form:
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// <pubkey> OP_CHECKSIG
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// Therefore the pubkey is the first item on the stack.
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// Skip the pubkey if it's invalid for some reason.
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requiredSigs = 1
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addr, err := btcutil.NewAddressPubKey(pops[0].data, net)
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if err == nil {
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addrs = append(addrs, addr)
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}
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case ScriptHashTy:
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// A pay-to-script-hash script is of the form:
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// OP_HASH160 <scripthash> OP_EQUAL
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// Therefore the script hash is the 2nd item on the stack.
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// Skip the script hash if it's invalid for some reason.
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requiredSigs = 1
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addr, err := btcutil.NewAddressScriptHashFromHash(pops[1].data, net)
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if err == nil {
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addrs = append(addrs, addr)
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}
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case MultiSigTy:
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// A multi-signature script is of the form:
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// <numsigs> <pubkey> <pubkey> <pubkey>... <numpubkeys> OP_CHECKMULTISIG
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// Therefore the number of required signatures is the 1st item
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// on the stack and the number of public keys is the 2nd to last
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// item on the stack.
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requiredSigs = asSmallInt(pops[0].opcode)
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numPubKeys := asSmallInt(pops[len(pops)-2].opcode)
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// Extract the public keys while skipping any that are invalid.
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addrs = make([]btcutil.Address, 0, numPubKeys)
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for i := 0; i < numPubKeys; i++ {
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addr, err := btcutil.NewAddressPubKey(pops[i+1].data, net)
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if err == nil {
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addrs = append(addrs, addr)
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}
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}
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case NullDataTy:
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// Null data transactions have no addresses or required
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// signatures.
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case NonStandardTy:
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// Don't attempt to extract addresses or required signatures for
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// nonstandard transactions.
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}
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return scriptClass, addrs, requiredSigs, nil
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}
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