298 lines
9.6 KiB
JavaScript
298 lines
9.6 KiB
JavaScript
import { ZeroHash } from "../constants/index.js";
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import { concat, dataLength, getBigInt, getBytes, getNumber, hexlify, toBeArray, isHexString, zeroPadValue, assertArgument, assertPrivate } from "../utils/index.js";
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// Constants
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const BN_0 = BigInt(0);
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const BN_1 = BigInt(1);
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const BN_2 = BigInt(2);
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const BN_27 = BigInt(27);
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const BN_28 = BigInt(28);
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const BN_35 = BigInt(35);
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const _guard = {};
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function toUint256(value) {
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return zeroPadValue(toBeArray(value), 32);
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}
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/**
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* A Signature @TODO
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*/
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export class Signature {
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#r;
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#s;
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#v;
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#networkV;
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/**
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* The ``r`` value for a signautre.
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*
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* This represents the ``x`` coordinate of a "reference" or
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* challenge point, from which the ``y`` can be computed.
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*/
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get r() { return this.#r; }
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set r(value) {
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assertArgument(dataLength(value) === 32, "invalid r", "value", value);
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this.#r = hexlify(value);
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}
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/**
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* The ``s`` value for a signature.
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*/
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get s() { return this.#s; }
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set s(_value) {
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assertArgument(dataLength(_value) === 32, "invalid r", "value", _value);
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const value = hexlify(_value);
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assertArgument(parseInt(value.substring(0, 3)) < 8, "non-canonical s", "value", value);
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this.#s = value;
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}
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/**
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* The ``v`` value for a signature.
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*
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* Since a given ``x`` value for ``r`` has two possible values for
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* its correspondin ``y``, the ``v`` indicates which of the two ``y``
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* values to use.
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*
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* It is normalized to the values ``27`` or ``28`` for legacy
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* purposes.
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*/
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get v() { return this.#v; }
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set v(value) {
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const v = getNumber(value, "value");
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assertArgument(v === 27 || v === 28, "invalid v", "v", value);
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this.#v = v;
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}
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/**
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* The EIP-155 ``v`` for legacy transactions. For non-legacy
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* transactions, this value is ``null``.
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*/
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get networkV() { return this.#networkV; }
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/**
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* The chain ID for EIP-155 legacy transactions. For non-legacy
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* transactions, this value is ``null``.
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*/
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get legacyChainId() {
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const v = this.networkV;
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if (v == null) {
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return null;
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}
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return Signature.getChainId(v);
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}
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/**
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* The ``yParity`` for the signature.
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*
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* See ``v`` for more details on how this value is used.
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*/
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get yParity() {
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return (this.v === 27) ? 0 : 1;
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}
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/**
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* The [[link-eip-2098]] compact representation of the ``yParity``
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* and ``s`` compacted into a single ``bytes32``.
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*/
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get yParityAndS() {
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// The EIP-2098 compact representation
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const yParityAndS = getBytes(this.s);
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if (this.yParity) {
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yParityAndS[0] |= 0x80;
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}
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return hexlify(yParityAndS);
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}
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/**
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* The [[link-eip-2098]] compact representation.
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*/
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get compactSerialized() {
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return concat([this.r, this.yParityAndS]);
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}
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/**
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* The serialized representation.
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*/
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get serialized() {
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return concat([this.r, this.s, (this.yParity ? "0x1c" : "0x1b")]);
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}
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/**
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* @private
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*/
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constructor(guard, r, s, v) {
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assertPrivate(guard, _guard, "Signature");
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this.#r = r;
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this.#s = s;
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this.#v = v;
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this.#networkV = null;
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}
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[Symbol.for('nodejs.util.inspect.custom')]() {
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return `Signature { r: "${this.r}", s: "${this.s}", yParity: ${this.yParity}, networkV: ${this.networkV} }`;
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}
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/**
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* Returns a new identical [[Signature]].
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*/
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clone() {
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const clone = new Signature(_guard, this.r, this.s, this.v);
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if (this.networkV) {
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clone.#networkV = this.networkV;
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}
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return clone;
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}
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/**
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* Returns a representation that is compatible with ``JSON.stringify``.
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*/
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toJSON() {
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const networkV = this.networkV;
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return {
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_type: "signature",
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networkV: ((networkV != null) ? networkV.toString() : null),
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r: this.r, s: this.s, v: this.v,
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};
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}
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/**
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* Compute the chain ID from the ``v`` in a legacy EIP-155 transactions.
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*
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* @example:
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* Signature.getChainId(45)
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* //_result:
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*
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* Signature.getChainId(46)
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* //_result:
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*/
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static getChainId(v) {
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const bv = getBigInt(v, "v");
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// The v is not an EIP-155 v, so it is the unspecified chain ID
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if ((bv == BN_27) || (bv == BN_28)) {
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return BN_0;
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}
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// Bad value for an EIP-155 v
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assertArgument(bv >= BN_35, "invalid EIP-155 v", "v", v);
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return (bv - BN_35) / BN_2;
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}
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/**
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* Compute the ``v`` for a chain ID for a legacy EIP-155 transactions.
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*
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* Legacy transactions which use [[link-eip-155]] hijack the ``v``
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* property to include the chain ID.
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*
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* @example:
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* Signature.getChainIdV(5, 27)
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* //_result:
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*
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* Signature.getChainIdV(5, 28)
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* //_result:
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*
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*/
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static getChainIdV(chainId, v) {
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return (getBigInt(chainId) * BN_2) + BigInt(35 + v - 27);
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}
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/**
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* Compute the normalized legacy transaction ``v`` from a ``yParirty``,
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* a legacy transaction ``v`` or a legacy [[link-eip-155]] transaction.
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*
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* @example:
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* // The values 0 and 1 imply v is actually yParity
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* Signature.getNormalizedV(0)
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* //_result:
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*
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* // Legacy non-EIP-1559 transaction (i.e. 27 or 28)
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* Signature.getNormalizedV(27)
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* //_result:
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*
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* // Legacy EIP-155 transaction (i.e. >= 35)
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* Signature.getNormalizedV(46)
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* //_result:
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*
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* // Invalid values throw
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* Signature.getNormalizedV(5)
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* //_error:
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*/
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static getNormalizedV(v) {
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const bv = getBigInt(v);
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if (bv === BN_0 || bv === BN_27) {
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return 27;
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}
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if (bv === BN_1 || bv === BN_28) {
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return 28;
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}
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assertArgument(bv >= BN_35, "invalid v", "v", v);
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// Otherwise, EIP-155 v means odd is 27 and even is 28
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return (bv & BN_1) ? 27 : 28;
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}
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/**
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* Creates a new [[Signature]].
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*
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* If no %%sig%% is provided, a new [[Signature]] is created
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* with default values.
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*
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* If %%sig%% is a string, it is parsed.
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*/
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static from(sig) {
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function assertError(check, message) {
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assertArgument(check, message, "signature", sig);
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}
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;
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if (sig == null) {
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return new Signature(_guard, ZeroHash, ZeroHash, 27);
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}
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if (typeof (sig) === "string") {
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const bytes = getBytes(sig, "signature");
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if (bytes.length === 64) {
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const r = hexlify(bytes.slice(0, 32));
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const s = bytes.slice(32, 64);
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const v = (s[0] & 0x80) ? 28 : 27;
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s[0] &= 0x7f;
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return new Signature(_guard, r, hexlify(s), v);
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}
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if (bytes.length === 65) {
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const r = hexlify(bytes.slice(0, 32));
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const s = bytes.slice(32, 64);
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assertError((s[0] & 0x80) === 0, "non-canonical s");
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const v = Signature.getNormalizedV(bytes[64]);
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return new Signature(_guard, r, hexlify(s), v);
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}
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assertError(false, "invlaid raw signature length");
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}
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if (sig instanceof Signature) {
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return sig.clone();
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}
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// Get r
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const _r = sig.r;
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assertError(_r != null, "missing r");
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const r = toUint256(_r);
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// Get s; by any means necessary (we check consistency below)
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const s = (function (s, yParityAndS) {
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if (s != null) {
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return toUint256(s);
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}
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if (yParityAndS != null) {
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assertError(isHexString(yParityAndS, 32), "invalid yParityAndS");
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const bytes = getBytes(yParityAndS);
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bytes[0] &= 0x7f;
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return hexlify(bytes);
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}
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assertError(false, "missing s");
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})(sig.s, sig.yParityAndS);
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assertError((getBytes(s)[0] & 0x80) == 0, "non-canonical s");
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// Get v; by any means necessary (we check consistency below)
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const { networkV, v } = (function (_v, yParityAndS, yParity) {
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if (_v != null) {
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const v = getBigInt(_v);
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return {
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networkV: ((v >= BN_35) ? v : undefined),
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v: Signature.getNormalizedV(v)
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};
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}
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if (yParityAndS != null) {
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assertError(isHexString(yParityAndS, 32), "invalid yParityAndS");
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return { v: ((getBytes(yParityAndS)[0] & 0x80) ? 28 : 27) };
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}
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if (yParity != null) {
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switch (yParity) {
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case 0: return { v: 27 };
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case 1: return { v: 28 };
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}
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assertError(false, "invalid yParity");
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}
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assertError(false, "missing v");
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})(sig.v, sig.yParityAndS, sig.yParity);
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const result = new Signature(_guard, r, s, v);
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if (networkV) {
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result.#networkV = networkV;
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}
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// If multiple of v, yParity, yParityAndS we given, check they match
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assertError(!("yParity" in sig && sig.yParity !== result.yParity), "yParity mismatch");
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assertError(!("yParityAndS" in sig && sig.yParityAndS !== result.yParityAndS), "yParityAndS mismatch");
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return result;
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}
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}
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//# sourceMappingURL=signature.js.map
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