Merge pull request #540 from blocktrail/segwit-prep
Refactoring `extractInput` and `__build` to enable nested scripts
This commit is contained in:
Daniel Cousens
commit
285bbd6478
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@ -44,86 +44,98 @@ function fixMSSignatures (transaction, vin, pubKeys, signatures, prevOutScript,
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}
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function extractInput (transaction, txIn, vin) {
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var redeemScript
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var scriptSig = txIn.script
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var scriptSigChunks = bscript.decompile(scriptSig)
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var scriptSigChunks = bscript.decompile(txIn.script)
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var prevOutType = bscript.classifyInput(scriptSigChunks, true)
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var prevOutScript
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var prevOutType = bscript.classifyInput(scriptSig, true)
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var scriptType
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// Re-classify if scriptHash
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if (prevOutType === 'scripthash') {
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redeemScript = scriptSigChunks.slice(-1)[0]
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prevOutScript = bscript.scriptHashOutput(bcrypto.hash160(redeemScript))
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scriptSig = bscript.compile(scriptSigChunks.slice(0, -1))
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scriptSigChunks = scriptSigChunks.slice(0, -1)
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scriptType = bscript.classifyInput(scriptSig, true)
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} else {
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scriptType = prevOutType
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if (txIn.script.length === 0) {
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return {}
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}
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// pre-empt redeemScript decompilation
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var redeemScriptChunks
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if (redeemScript) {
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redeemScriptChunks = bscript.decompile(redeemScript)
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}
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var processScript = function (scriptType, scriptSigChunks, redeemScriptChunks) {
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// ensure chunks are decompiled
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scriptSigChunks = bscript.decompile(scriptSigChunks)
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redeemScriptChunks = redeemScriptChunks ? bscript.decompile(redeemScriptChunks) : undefined
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// Extract hashType, pubKeys and signatures
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var hashType, parsed, pubKeys, signatures
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var hashType, pubKeys, signatures, prevOutScript, redeemScript, redeemScriptType, result, parsed
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switch (scriptType) {
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case 'pubkeyhash':
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parsed = ECSignature.parseScriptSignature(scriptSigChunks[0])
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hashType = parsed.hashType
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pubKeys = scriptSigChunks.slice(1)
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signatures = [parsed.signature]
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prevOutScript = bscript.pubKeyHashOutput(bcrypto.hash160(pubKeys[0]))
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switch (scriptType) {
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case 'scripthash':
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redeemScript = scriptSigChunks.slice(-1)[0]
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scriptSigChunks = bscript.compile(scriptSigChunks.slice(0, -1))
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break
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redeemScriptType = bscript.classifyInput(scriptSigChunks, true)
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prevOutScript = bscript.scriptHashOutput(bcrypto.hash160(redeemScript))
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case 'pubkey':
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parsed = ECSignature.parseScriptSignature(scriptSigChunks[0])
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hashType = parsed.hashType
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signatures = [parsed.signature]
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result = processScript(redeemScriptType, scriptSigChunks, bscript.decompile(redeemScript))
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if (redeemScript) {
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pubKeys = redeemScriptChunks.slice(0, 1)
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}
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result.prevOutScript = prevOutScript
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result.redeemScript = redeemScript
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result.redeemScriptType = redeemScriptType
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break
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return result
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case 'multisig':
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signatures = scriptSigChunks.slice(1).map(function (chunk) {
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if (chunk === ops.OP_0) return undefined
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var parsed = ECSignature.parseScriptSignature(chunk)
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case 'pubkeyhash':
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parsed = ECSignature.parseScriptSignature(scriptSigChunks[0])
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hashType = parsed.hashType
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pubKeys = scriptSigChunks.slice(1)
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signatures = [parsed.signature]
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prevOutScript = bscript.pubKeyHashOutput(bcrypto.hash160(pubKeys[0]))
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return parsed.signature
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})
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break
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if (redeemScript) {
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pubKeys = redeemScriptChunks.slice(1, -2)
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case 'pubkey':
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parsed = ECSignature.parseScriptSignature(scriptSigChunks[0])
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hashType = parsed.hashType
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signatures = [parsed.signature]
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if (pubKeys.length !== signatures.length) {
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signatures = fixMSSignatures(transaction, vin, pubKeys, signatures, redeemScript, hashType, redeemScript)
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if (redeemScriptChunks) {
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pubKeys = redeemScriptChunks.slice(0, 1)
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}
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}
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break
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break
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case 'multisig':
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signatures = scriptSigChunks.slice(1).map(function (chunk) {
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if (chunk === ops.OP_0) return undefined
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parsed = ECSignature.parseScriptSignature(chunk)
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hashType = parsed.hashType
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return parsed.signature
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})
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if (redeemScriptChunks) {
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pubKeys = redeemScriptChunks.slice(1, -2)
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if (pubKeys.length !== signatures.length) {
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signatures = fixMSSignatures(transaction, vin, pubKeys, signatures, bscript.compile(redeemScriptChunks), hashType, redeemScript)
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}
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}
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break
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}
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return {
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hashType: hashType,
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pubKeys: pubKeys,
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signatures: signatures,
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prevOutScript: prevOutScript,
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redeemScript: redeemScript,
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redeemScriptType: redeemScriptType
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}
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}
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// Extract hashType, pubKeys, signatures and prevOutScript
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var result = processScript(prevOutType, scriptSigChunks)
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return {
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hashType: hashType,
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prevOutScript: prevOutScript,
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hashType: result.hashType,
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prevOutScript: result.prevOutScript,
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prevOutType: prevOutType,
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pubKeys: pubKeys,
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redeemScript: redeemScript,
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scriptType: scriptType,
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signatures: signatures
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pubKeys: result.pubKeys,
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redeemScript: result.redeemScript,
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redeemScriptType: result.redeemScriptType,
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signatures: result.signatures
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}
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}
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@ -176,9 +188,6 @@ TransactionBuilder.fromTransaction = function (transaction, network) {
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throw new Error('coinbase inputs not supported')
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}
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// Ignore empty scripts
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if (txIn.script.length === 0) return {}
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return extractInput(transaction, txIn, vin)
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})
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@ -298,7 +307,7 @@ TransactionBuilder.prototype.__build = function (allowIncomplete) {
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// Create script signatures from inputs
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this.inputs.forEach(function (input, index) {
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var scriptType = input.scriptType
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var scriptType = input.redeemScriptType || input.prevOutType
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var scriptSig
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if (!allowIncomplete) {
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@ -310,46 +319,55 @@ TransactionBuilder.prototype.__build = function (allowIncomplete) {
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}
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if (input.signatures) {
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switch (scriptType) {
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case 'pubkeyhash':
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var pkhSignature = input.signatures[0].toScriptSignature(input.hashType)
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scriptSig = bscript.pubKeyHashInput(pkhSignature, input.pubKeys[0])
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break
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var processScript = function (scriptType, parentType, redeemScript) {
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var scriptSig
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var pkhSignature
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case 'multisig':
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var msSignatures = input.signatures.map(function (signature) {
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return signature && signature.toScriptSignature(input.hashType)
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})
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switch (scriptType) {
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case 'pubkeyhash':
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pkhSignature = input.signatures[0].toScriptSignature(input.hashType)
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scriptSig = bscript.pubKeyHashInput(pkhSignature, input.pubKeys[0])
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break
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// fill in blanks with OP_0
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if (allowIncomplete) {
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for (var i = 0; i < msSignatures.length; ++i) {
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msSignatures[i] = msSignatures[i] || ops.OP_0
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case 'multisig':
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var msSignatures = input.signatures.map(function (signature) {
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return signature && signature.toScriptSignature(input.hashType)
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})
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// fill in blanks with OP_0
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if (allowIncomplete) {
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for (var i = 0; i < msSignatures.length; ++i) {
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msSignatures[i] = msSignatures[i] || ops.OP_0
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}
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// remove blank signatures
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} else {
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msSignatures = msSignatures.filter(function (x) { return x })
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}
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// remove blank signatures
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} else {
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msSignatures = msSignatures.filter(function (x) { return x })
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}
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scriptSig = bscript.multisigInput(msSignatures, allowIncomplete ? undefined : redeemScript)
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var redeemScript = allowIncomplete ? undefined : input.redeemScript
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scriptSig = bscript.multisigInput(msSignatures, redeemScript)
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break
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break
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case 'pubkey':
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var pkSignature = input.signatures[0].toScriptSignature(input.hashType)
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scriptSig = bscript.pubKeyInput(pkSignature)
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break
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case 'pubkey':
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var pkSignature = input.signatures[0].toScriptSignature(input.hashType)
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scriptSig = bscript.pubKeyInput(pkSignature)
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break
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}
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// wrap as scriptHash if necessary
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if (parentType === 'scripthash') {
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scriptSig = bscript.scriptHashInput(scriptSig, redeemScript)
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}
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return scriptSig
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}
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scriptSig = processScript(scriptType, input.prevOutType, input.redeemScript)
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}
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// did we build a scriptSig?
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// did we build a scriptSig? Buffer('') is allowed
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if (scriptSig) {
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// wrap as scriptHash if necessary
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if (input.prevOutType === 'scripthash') {
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scriptSig = bscript.scriptHashInput(scriptSig, input.redeemScript)
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}
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tx.setInputScript(index, scriptSig)
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}
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})
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@ -367,11 +385,12 @@ TransactionBuilder.prototype.sign = function (index, keyPair, redeemScript, hash
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input.prevOutScript &&
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input.prevOutType &&
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input.pubKeys &&
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input.scriptType &&
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input.redeemScriptType &&
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input.signatures &&
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input.signatures.length === input.pubKeys.length
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var kpPubKey = keyPair.getPublicKeyBuffer()
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var signatureScript
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// are we ready to sign?
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if (canSign) {
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@ -385,6 +404,7 @@ TransactionBuilder.prototype.sign = function (index, keyPair, redeemScript, hash
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// no? prepare
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} else {
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// must be pay-to-scriptHash?
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if (redeemScript) {
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// if we have a prevOutScript, enforce scriptHash equality to the redeemScript
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if (input.prevOutScript) {
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@ -394,34 +414,43 @@ TransactionBuilder.prototype.sign = function (index, keyPair, redeemScript, hash
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if (!bufferEquals(scriptHash, bcrypto.hash160(redeemScript))) throw new Error('RedeemScript does not match ' + scriptHash.toString('hex'))
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}
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var scriptType = bscript.classifyOutput(redeemScript)
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var redeemScriptChunks = bscript.decompile(redeemScript)
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var pubKeys
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var pubKeys, pkh1, pkh2
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switch (scriptType) {
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case 'multisig':
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pubKeys = redeemScriptChunks.slice(1, -2)
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var redeemScriptType
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break
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var processScript = function (redeemScript) {
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var scriptType = bscript.classifyOutput(redeemScript)
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var redeemScriptChunks = bscript.decompile(redeemScript)
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case 'pubkeyhash':
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var pkh1 = redeemScriptChunks[2]
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var pkh2 = bcrypto.hash160(keyPair.getPublicKeyBuffer())
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switch (scriptType) {
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case 'multisig':
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pubKeys = redeemScriptChunks.slice(1, -2)
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if (!bufferEquals(pkh1, pkh2)) throw new Error('privateKey cannot sign for this input')
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pubKeys = [kpPubKey]
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break
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break
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case 'pubkeyhash':
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pkh1 = redeemScriptChunks[2]
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pkh2 = bcrypto.hash160(keyPair.getPublicKeyBuffer())
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case 'pubkey':
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pubKeys = redeemScriptChunks.slice(0, 1)
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if (!bufferEquals(pkh1, pkh2)) throw new Error('privateKey cannot sign for this input')
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pubKeys = [kpPubKey]
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break
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break
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default:
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throw new Error('RedeemScript not supported (' + scriptType + ')')
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case 'pubkey':
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pubKeys = redeemScriptChunks.slice(0, 1)
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break
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default:
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throw new Error('RedeemScript not supported (' + scriptType + ')')
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}
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return scriptType
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}
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redeemScriptType = processScript(redeemScript)
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// if we don't have a prevOutScript, generate a P2SH script
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if (!input.prevOutScript) {
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input.prevOutScript = bscript.scriptHashOutput(bcrypto.hash160(redeemScript))
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@ -430,7 +459,7 @@ TransactionBuilder.prototype.sign = function (index, keyPair, redeemScript, hash
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input.pubKeys = pubKeys
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input.redeemScript = redeemScript
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input.scriptType = scriptType
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input.redeemScriptType = redeemScriptType
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input.signatures = pubKeys.map(function () { return undefined })
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} else {
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// pay-to-scriptHash is not possible without a redeemScript
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@ -440,6 +469,7 @@ TransactionBuilder.prototype.sign = function (index, keyPair, redeemScript, hash
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if (!input.scriptType) {
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input.prevOutScript = bscript.pubKeyHashOutput(bcrypto.hash160(keyPair.getPublicKeyBuffer()))
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input.prevOutType = 'pubkeyhash'
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input.pubKeys = [kpPubKey]
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input.scriptType = input.prevOutType
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input.signatures = [undefined]
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@ -453,7 +483,7 @@ TransactionBuilder.prototype.sign = function (index, keyPair, redeemScript, hash
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}
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// ready to sign?
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var signatureScript = input.redeemScript || input.prevOutScript
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signatureScript = signatureScript || input.redeemScript || input.prevOutScript
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var signatureHash = this.tx.hashForSignature(index, signatureScript, hashType)
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// enforce in order signing of public keys
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@ -461,8 +491,7 @@ TransactionBuilder.prototype.sign = function (index, keyPair, redeemScript, hash
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if (!bufferEquals(kpPubKey, pubKey)) return false
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if (input.signatures[i]) throw new Error('Signature already exists')
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var signature = keyPair.sign(signatureHash)
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input.signatures[i] = signature
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input.signatures[i] = keyPair.sign(signatureHash)
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return true
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})
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