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AddressHashMode,
AuthType,
MultiSigHashMode,
PubKeyEncoding,
SingleSigHashMode,
} from './common/constants';
import { leftPadHex, txidFromData } from './common/utils';
import {
addressFromPublicKeys,
createEmptyAddress,
createLPList,
deserializeLPList,
serializeLPList,
} from './types';
import {
compressPublicKey,
createStacksPublicKey,
deserializePublicKey,
getPublicKeyFromStacksPrivateKey,
isCompressed,
publicKeyFromSignature,
serializePublicKey,
signWithKey,
StacksPrivateKey,
StacksPublicKey,
} from './keys';
import {
BufferArray,
BufferReader,
bytesToHex,
cloneDeep,
hexToBytes,
IntegerType,
writeUInt16BE,
DeserializationError,
SerializationError,
SigningError,
intToBigInt,
intToBytes,
concatByteArrays,
} from 'micro-stacks/common';
import { RECOVERABLE_ECDSA_SIG_LENGTH_BYTES, StacksMessageType } from 'micro-stacks/clarity';
export abstract class Deserializable {
abstract serialize(): Uint8Array;
abstract deserialize(bufferReader: BufferReader): void;
static deserialize<T extends Deserializable>(this: new () => T, bufferReader: BufferReader): T {
const message = new this();
message.deserialize(bufferReader);
return message;
}
}
export interface MessageSignature {
readonly type: StacksMessageType.MessageSignature;
data: string;
}
export function createMessageSignature(signature: string): MessageSignature {
const length = hexToBytes(signature).byteLength;
Iif (length != RECOVERABLE_ECDSA_SIG_LENGTH_BYTES) {
throw Error('Invalid signature');
}
return {
type: StacksMessageType.MessageSignature,
data: signature,
};
}
export function emptyMessageSignature(): MessageSignature {
return {
type: StacksMessageType.MessageSignature,
data: bytesToHex(new Uint8Array(RECOVERABLE_ECDSA_SIG_LENGTH_BYTES).fill(0x00)),
};
}
export function serializeMessageSignature(messageSignature: MessageSignature): Uint8Array {
const bufferArray: BufferArray = new BufferArray();
bufferArray.appendHexString(messageSignature.data);
return bufferArray.concatBuffer();
}
export function deserializeMessageSignature(bufferReader: BufferReader): MessageSignature {
return createMessageSignature(
bytesToHex(bufferReader.readBuffer(RECOVERABLE_ECDSA_SIG_LENGTH_BYTES))
);
}
enum AuthFieldType {
PublicKeyCompressed = 0x00,
PublicKeyUncompressed = 0x01,
SignatureCompressed = 0x02,
SignatureUncompressed = 0x03,
}
export type TransactionAuthFieldContents = StacksPublicKey | MessageSignature;
export interface TransactionAuthField {
type: StacksMessageType.TransactionAuthField;
pubKeyEncoding: PubKeyEncoding;
contents: TransactionAuthFieldContents;
}
export function createTransactionAuthField(
pubKeyEncoding: PubKeyEncoding,
contents: TransactionAuthFieldContents
): TransactionAuthField {
return {
pubKeyEncoding,
type: StacksMessageType.TransactionAuthField,
contents,
};
}
export function serializeTransactionAuthField(field: TransactionAuthField): Uint8Array {
const bufferArray: BufferArray = new BufferArray();
switch (field.contents.type) {
case StacksMessageType.PublicKey:
if (field.pubKeyEncoding == PubKeyEncoding.Compressed) {
bufferArray.appendByte(AuthFieldType.PublicKeyCompressed);
bufferArray.push(serializePublicKey(field.contents));
} else {
bufferArray.appendByte(AuthFieldType.PublicKeyUncompressed);
bufferArray.push(serializePublicKey(compressPublicKey(field.contents.data)));
}
break;
case StacksMessageType.MessageSignature:
if (field.pubKeyEncoding == PubKeyEncoding.Compressed) {
bufferArray.appendByte(AuthFieldType.SignatureCompressed);
} else {
bufferArray.appendByte(AuthFieldType.SignatureUncompressed);
}
bufferArray.push(serializeMessageSignature(field.contents));
break;
}
return bufferArray.concatBuffer();
}
export function deserializeTransactionAuthField(bufferReader: BufferReader): TransactionAuthField {
const authFieldType = bufferReader.readUInt8Enum(AuthFieldType, n => {
throw new DeserializationError(`Could not read ${n} as AuthFieldType`);
});
switch (authFieldType) {
case AuthFieldType.PublicKeyCompressed:
return createTransactionAuthField(
PubKeyEncoding.Compressed,
deserializePublicKey(bufferReader)
);
case AuthFieldType.PublicKeyUncompressed:
return createTransactionAuthField(
PubKeyEncoding.Uncompressed,
deserializePublicKey(bufferReader)
);
case AuthFieldType.SignatureCompressed:
return createTransactionAuthField(
PubKeyEncoding.Compressed,
deserializeMessageSignature(bufferReader)
);
case AuthFieldType.SignatureUncompressed:
return createTransactionAuthField(
PubKeyEncoding.Uncompressed,
deserializeMessageSignature(bufferReader)
);
default:
throw new Error(`Unknown auth field type: ${JSON.stringify(authFieldType)}`);
}
}
export interface SingleSigSpendingCondition {
hashMode: SingleSigHashMode;
signer: string;
nonce: bigint;
fee: bigint;
keyEncoding: PubKeyEncoding;
signature: MessageSignature;
}
export interface SingleSigSpendingConditionOpts
extends Omit<SingleSigSpendingCondition, 'nonce' | 'fee'> {
nonce: IntegerType;
fee: IntegerType;
}
export interface MultiSigSpendingCondition {
hashMode: MultiSigHashMode;
signer: string;
nonce: bigint;
fee: bigint;
fields: TransactionAuthField[];
signaturesRequired: number;
}
export interface MultiSigSpendingConditionOpts
extends Omit<MultiSigSpendingCondition, 'nonce' | 'fee'> {
nonce: IntegerType;
fee: IntegerType;
}
export type SpendingCondition = SingleSigSpendingCondition | MultiSigSpendingCondition;
export type SpendingConditionOpts = SingleSigSpendingConditionOpts | MultiSigSpendingConditionOpts;
export function createSingleSigSpendingCondition(
hashMode: SingleSigHashMode,
pubKey: string,
nonce: IntegerType,
fee: IntegerType
): SingleSigSpendingCondition {
// address version arg doesn't matter for signer hash generation
const signer = addressFromPublicKeys(0, hashMode, 1, [createStacksPublicKey(pubKey)]).hash160;
const keyEncoding = isCompressed(createStacksPublicKey(pubKey))
? PubKeyEncoding.Compressed
: PubKeyEncoding.Uncompressed;
return {
hashMode,
signer,
nonce: intToBigInt(nonce, false),
fee: intToBigInt(fee, false),
keyEncoding,
signature: emptyMessageSignature(),
};
}
export function createMultiSigSpendingCondition(
hashMode: MultiSigHashMode,
numSigs: number,
pubKeys: string[],
nonce: IntegerType,
fee: IntegerType
): MultiSigSpendingCondition {
const stacksPublicKeys = pubKeys.map(createStacksPublicKey);
// address version arg doesn't matter for signer hash generation
const signer = addressFromPublicKeys(0, hashMode, numSigs, stacksPublicKeys).hash160;
return {
hashMode,
signer,
nonce: intToBigInt(nonce, false),
fee: intToBigInt(fee, false),
fields: [],
signaturesRequired: numSigs,
};
}
export function isSingleSig(
condition: SpendingConditionOpts
): condition is SingleSigSpendingConditionOpts {
return 'signature' in condition;
}
function clearCondition(condition: SpendingConditionOpts): SpendingCondition {
const cloned = cloneDeep(condition);
cloned.nonce = 0;
cloned.fee = 0;
if (isSingleSig(cloned)) {
cloned.signature = emptyMessageSignature();
} else {
cloned.fields = [];
}
return {
...cloned,
nonce: BigInt(0),
fee: BigInt(0),
};
}
export function serializeSingleSigSpendingCondition(
condition: SingleSigSpendingConditionOpts
): Uint8Array {
const bufferArray: BufferArray = new BufferArray();
bufferArray.appendByte(condition.hashMode);
bufferArray.appendHexString(condition.signer);
bufferArray.push(intToBytes(condition.nonce, false, 8));
bufferArray.push(intToBytes(condition.fee, false, 8));
bufferArray.appendByte(condition.keyEncoding);
bufferArray.push(serializeMessageSignature(condition.signature));
return bufferArray.concatBuffer();
}
export function serializeMultiSigSpendingCondition(
condition: MultiSigSpendingConditionOpts
): Uint8Array {
const bufferArray: BufferArray = new BufferArray();
bufferArray.appendByte(condition.hashMode);
bufferArray.appendHexString(condition.signer);
bufferArray.push(intToBytes(condition.nonce, false, 8));
bufferArray.push(intToBytes(condition.fee, false, 8));
const fields = createLPList(condition.fields);
bufferArray.push(serializeLPList(fields));
const numSigs = new Uint8Array(2);
writeUInt16BE(numSigs, condition.signaturesRequired, 0);
bufferArray.push(numSigs);
return bufferArray.concatBuffer();
}
export function deserializeSingleSigSpendingCondition(
hashMode: SingleSigHashMode,
bufferReader: BufferReader
): SingleSigSpendingCondition {
const signer = bytesToHex(bufferReader.readBuffer(20));
const nonce = BigInt('0x' + bytesToHex(bufferReader.readBuffer(8)));
const fee = BigInt('0x' + bytesToHex(bufferReader.readBuffer(8)));
const keyEncoding = bufferReader.readUInt8Enum(PubKeyEncoding, n => {
throw new DeserializationError(`Could not parse ${n} as PubKeyEncoding`);
});
Iif (hashMode === AddressHashMode.SerializeP2WPKH && keyEncoding != PubKeyEncoding.Compressed) {
throw new DeserializationError(
'Failed to parse singlesig spending condition: incomaptible hash mode and key encoding'
);
}
const signature = deserializeMessageSignature(bufferReader);
return {
hashMode,
signer,
nonce,
fee,
keyEncoding,
signature,
};
}
export function deserializeMultiSigSpendingCondition(
hashMode: MultiSigHashMode,
bufferReader: BufferReader
): MultiSigSpendingCondition {
const signer = bytesToHex(bufferReader.readBuffer(20));
const nonce = BigInt('0x' + bytesToHex(bufferReader.readBuffer(8)));
const fee = BigInt('0x' + bytesToHex(bufferReader.readBuffer(8)));
const fields = deserializeLPList(bufferReader, StacksMessageType.TransactionAuthField)
.values as TransactionAuthField[];
let haveUncompressed = false;
let numSigs = 0;
for (const field of fields) {
switch (field.contents.type) {
case StacksMessageType.PublicKey:
Iif (!isCompressed(field.contents)) haveUncompressed = true;
break;
case StacksMessageType.MessageSignature:
if (field.pubKeyEncoding === PubKeyEncoding.Uncompressed) haveUncompressed = true;
numSigs += 1;
Iif (numSigs === 65536)
throw new TypeError('Failed to parse multisig spending condition: too many signatures');
break;
}
}
const signaturesRequired = bufferReader.readUInt16BE();
// Partially signed multi-sig tx can be serialized and deserialized without exception (Incorrect number of signatures)
// No need to check numSigs !== signaturesRequired to throw Incorrect number of signatures error
// Uncompressed keys are incompatible with BIP067 @see https://github.com/bitcoin/bips/blob/master/bip-0067.mediawiki
// SerializeP2SH would allow it, but it does not follow the standard
// SerializeP2WSH (segwit) does _not_ allow for it
Iif (haveUncompressed && hashMode === AddressHashMode.SerializeP2WSH)
throw new TypeError('Public keys must be compressed for segwit');
return {
hashMode,
signer,
nonce,
fee,
fields,
signaturesRequired,
};
}
export function serializeSpendingCondition(condition: SpendingConditionOpts): Uint8Array {
if (isSingleSig(condition)) {
return serializeSingleSigSpendingCondition(condition);
} else {
return serializeMultiSigSpendingCondition(condition);
}
}
export function deserializeSpendingCondition(bufferReader: BufferReader): SpendingCondition {
const hashMode = bufferReader.readUInt8Enum(AddressHashMode, n => {
throw new DeserializationError(`Could not parse ${n} as AddressHashMode`);
});
if (hashMode === AddressHashMode.SerializeP2PKH || hashMode === AddressHashMode.SerializeP2WPKH) {
return deserializeSingleSigSpendingCondition(hashMode, bufferReader);
} else {
return deserializeMultiSigSpendingCondition(hashMode, bufferReader);
}
}
export function makeSigHashPreSign(
curSigHash: string,
authType: AuthType,
fee: IntegerType,
nonce: IntegerType
): string {
// new hash combines the previous hash and all the new data this signature will add. This
// includes:
// * the previous hash
// * the auth flag
// * the tx fee (big-endian 8-byte number)
// * nonce (big-endian 8-byte number)
const hashLength = 32 + 1 + 8 + 8;
const sigHash = [
hexToBytes(curSigHash),
Uint8Array.from([authType]),
intToBytes(fee, false, 8),
intToBytes(nonce, false, 8),
];
const buff = concatByteArrays(sigHash);
Iif (buff.byteLength !== hashLength) {
throw Error('Invalid signature hash length');
}
return txidFromData(buff);
}
function makeSigHashPostSign(
curSigHash: string,
pubKey: StacksPublicKey,
signature: MessageSignature
): string {
// new hash combines the previous hash and all the new data this signature will add. This
// includes:
// * the public key compression flag
// * the signature
const hashLength = 32 + 1 + RECOVERABLE_ECDSA_SIG_LENGTH_BYTES;
const pubKeyEncoding = isCompressed(pubKey)
? PubKeyEncoding.Compressed
: PubKeyEncoding.Uncompressed;
const sigHash = curSigHash + leftPadHex(pubKeyEncoding.toString(16)) + signature.data;
const sigHashBuffer = hexToBytes(sigHash);
Iif (sigHashBuffer.byteLength > hashLength) {
throw Error('Invalid signature hash length');
}
return txidFromData(sigHashBuffer);
}
export async function nextSignature(
curSigHash: string,
authType: AuthType,
fee: IntegerType,
nonce: IntegerType,
privateKey: StacksPrivateKey
): Promise<{
nextSig: MessageSignature;
nextSigHash: string;
}> {
const sigHashPreSign = makeSigHashPreSign(curSigHash, authType, fee, nonce);
const signature = await signWithKey(privateKey, sigHashPreSign);
const publicKey = getPublicKeyFromStacksPrivateKey(privateKey);
const nextSigHash = makeSigHashPostSign(sigHashPreSign, publicKey, signature);
return {
nextSig: signature,
nextSigHash,
};
}
export function nextVerification(
initialSigHash: string,
authType: AuthType,
fee: IntegerType,
nonce: IntegerType,
pubKeyEncoding: PubKeyEncoding,
signature: MessageSignature
) {
const sigHashPreSign = makeSigHashPreSign(initialSigHash, authType, fee, nonce);
const publicKey = createStacksPublicKey(
publicKeyFromSignature(sigHashPreSign, signature, pubKeyEncoding)
);
const nextSigHash = makeSigHashPostSign(sigHashPreSign, publicKey, signature);
return {
pubKey: publicKey,
nextSigHash,
};
}
function newInitialSigHash(): SpendingCondition {
const spendingCondition = createSingleSigSpendingCondition(
AddressHashMode.SerializeP2PKH,
'',
0,
0
);
spendingCondition.signer = createEmptyAddress().hash160;
spendingCondition.keyEncoding = PubKeyEncoding.Compressed;
spendingCondition.signature = emptyMessageSignature();
return spendingCondition;
}
function verify(
condition: SpendingConditionOpts,
initialSigHash: string,
authType: AuthType
): string {
if (isSingleSig(condition)) {
return verifySingleSig(condition, initialSigHash, authType);
} else {
return verifyMultiSig(condition, initialSigHash, authType);
}
}
function verifySingleSig(
condition: SingleSigSpendingConditionOpts,
initialSigHash: string,
authType: AuthType
): string {
const { nextSigHash, pubKey } = nextVerification(
initialSigHash,
authType,
condition.fee,
condition.nonce,
condition.keyEncoding,
condition.signature
);
const addrBytes = addressFromPublicKeys(0, condition.hashMode, 1, [pubKey]).hash160;
Iif (addrBytes !== condition.signer)
throw new TypeError(
`Signer hash does not equal hash of public key(s): ${addrBytes} != ${condition.signer}`
);
return nextSigHash;
}
function verifyMultiSig(
condition: MultiSigSpendingConditionOpts,
initialSigHash: string,
authType: AuthType
): string {
const publicKeys: StacksPublicKey[] = [];
let curSigHash = initialSigHash;
let haveUncompressed = false;
let numSigs = 0;
for (const field of condition.fields) {
let foundPubKey: StacksPublicKey;
switch (field.contents.type) {
case StacksMessageType.PublicKey:
if (!isCompressed(field.contents)) haveUncompressed = true;
foundPubKey = field.contents;
break;
case StacksMessageType.MessageSignature:
if (field.pubKeyEncoding === PubKeyEncoding.Uncompressed) haveUncompressed = true;
const { pubKey, nextSigHash } = nextVerification(
curSigHash,
authType,
condition.fee,
condition.nonce,
field.pubKeyEncoding,
field.contents
);
curSigHash = nextSigHash;
foundPubKey = pubKey;
numSigs += 1;
Iif (numSigs === 65536) throw new TypeError('Too many signatures');
break;
}
publicKeys.push(foundPubKey);
}
Iif (numSigs !== condition.signaturesRequired)
throw new TypeError('Incorrect number of signatures');
// Uncompressed keys are incompatible with BIP067 @see https://github.com/bitcoin/bips/blob/master/bip-0067.mediawiki
// SerializeP2SH would allow it, but it does not follow the standard
// SerializeP2WSH (segwit) does _not_ allow for it
Iif (haveUncompressed && condition.hashMode === AddressHashMode.SerializeP2WSH)
throw new TypeError('Uncompressed keys are not allowed in this hash mode');
const addrBytes = addressFromPublicKeys(
0,
condition.hashMode,
condition.signaturesRequired,
publicKeys
).hash160;
Iif (addrBytes !== condition.signer)
throw new TypeError(
`Signer hash does not equal hash of public key(s): ${addrBytes} != ${condition.signer}`
);
return curSigHash;
}
export type Authorization = StandardAuthorization | SponsoredAuthorization;
export interface StandardAuthorization {
authType: AuthType.Standard;
spendingCondition: SpendingCondition;
}
export interface SponsoredAuthorization {
authType: AuthType.Sponsored;
spendingCondition: SpendingCondition;
sponsorSpendingCondition: SpendingCondition;
}
export function createStandardAuth(spendingCondition: SpendingCondition): StandardAuthorization {
return {
authType: AuthType.Standard,
spendingCondition,
};
}
export function createSponsoredAuth(
spendingCondition: SpendingCondition,
sponsorSpendingCondition?: SpendingCondition
): Authorization {
return {
authType: AuthType.Sponsored,
spendingCondition,
sponsorSpendingCondition: sponsorSpendingCondition
? sponsorSpendingCondition
: createSingleSigSpendingCondition(AddressHashMode.SerializeP2PKH, '0'.repeat(66), 0, 0),
};
}
export function intoInitialSighashAuth(auth: Authorization): Authorization {
if (auth.spendingCondition) {
switch (auth.authType) {
case AuthType.Standard:
return createStandardAuth(clearCondition(auth.spendingCondition));
case AuthType.Sponsored:
return createSponsoredAuth(clearCondition(auth.spendingCondition), newInitialSigHash());
default:
throw new SigningError('Unexpected authorization type for signing');
}
}
throw new Error('Authorization missing SpendingCondition');
}
export function verifyOrigin(auth: Authorization, initialSigHash: string): string {
switch (auth.authType) {
case AuthType.Standard:
return verify(auth.spendingCondition, initialSigHash, AuthType.Standard);
case AuthType.Sponsored:
return verify(auth.spendingCondition, initialSigHash, AuthType.Standard);
default:
throw new SigningError('Invalid origin auth type');
}
}
export function setFee(auth: Authorization, amount: IntegerType): Authorization {
switch (auth.authType) {
case AuthType.Standard:
const spendingCondition = {
...auth.spendingCondition,
fee: intToBigInt(amount, false),
};
return { ...auth, spendingCondition };
case AuthType.Sponsored:
const sponsorSpendingCondition = {
...auth.sponsorSpendingCondition,
fee: intToBigInt(amount, false),
};
return { ...auth, sponsorSpendingCondition };
}
}
export function getFee(auth: Authorization): bigint {
switch (auth.authType) {
case AuthType.Standard:
return auth.spendingCondition.fee;
case AuthType.Sponsored:
return auth.sponsorSpendingCondition.fee;
}
}
export function setNonce(auth: Authorization, nonce: IntegerType): Authorization {
const spendingCondition = {
...auth.spendingCondition,
nonce: intToBigInt(nonce, false),
};
return {
...auth,
spendingCondition,
};
}
export function setSponsorNonce(auth: SponsoredAuthorization, nonce: IntegerType): Authorization {
const sponsorSpendingCondition = {
...auth.sponsorSpendingCondition,
nonce: intToBigInt(nonce, false),
};
return {
...auth,
sponsorSpendingCondition,
};
}
export function setSponsor(
auth: SponsoredAuthorization,
sponsorSpendingCondition: SpendingConditionOpts
): Authorization {
const sc = {
...sponsorSpendingCondition,
nonce: intToBigInt(sponsorSpendingCondition.nonce, false),
fee: intToBigInt(sponsorSpendingCondition.fee, false),
};
return {
...auth,
sponsorSpendingCondition: sc,
};
}
export function serializeAuthorization(auth: Authorization): Uint8Array {
const bufferArray: BufferArray = new BufferArray();
bufferArray.appendByte(auth.authType);
switch (auth.authType) {
case AuthType.Standard:
bufferArray.push(serializeSpendingCondition(auth.spendingCondition));
break;
case AuthType.Sponsored:
bufferArray.push(serializeSpendingCondition(auth.spendingCondition));
bufferArray.push(serializeSpendingCondition(auth.sponsorSpendingCondition));
break;
}
return bufferArray.concatBuffer();
}
export function deserializeAuthorization(bufferReader: BufferReader) {
const authType = bufferReader.readUInt8Enum(AuthType, n => {
throw new DeserializationError(`Could not parse ${n} as AuthType`);
});
let spendingCondition;
switch (authType) {
case AuthType.Standard:
spendingCondition = deserializeSpendingCondition(bufferReader);
return createStandardAuth(spendingCondition);
case AuthType.Sponsored:
spendingCondition = deserializeSpendingCondition(bufferReader);
const sponsorSpendingCondition = deserializeSpendingCondition(bufferReader);
return createSponsoredAuth(spendingCondition, sponsorSpendingCondition);
}
}
|