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import { ZeroHash } from "../constants/index.js";
import {
concat, dataLength, getBigInt, getBytes, getNumber, hexlify,
toBeArray, isHexString, zeroPadValue,
assertArgument, assertPrivate
} from "../utils/index.js";
import type {
BigNumberish, BytesLike, Numeric
} from "../utils/index.js";
// Constants
const BN_0 = BigInt(0);
const BN_1 = BigInt(1);
const BN_2 = BigInt(2);
const BN_27 = BigInt(27);
const BN_28 = BigInt(28);
const BN_35 = BigInt(35);
const _guard = { };
// @TODO: Allow Uint8Array
/**
* A SignatureLike
*
* @_docloc: api/crypto:Signing
*/
export type SignatureLike = Signature | string | {
r: string;
s: string;
v: BigNumberish;
yParity?: 0 | 1;
yParityAndS?: string;
} | {
r: string;
yParityAndS: string;
yParity?: 0 | 1;
s?: string;
v?: number;
} | {
r: string;
s: string;
yParity: 0 | 1;
v?: BigNumberish;
yParityAndS?: string;
};
function toUint256(value: BigNumberish): string {
return zeroPadValue(toBeArray(value), 32);
}
/**
* A Signature @TODO
*
*
* @_docloc: api/crypto:Signing
*/
export class Signature {
#r: string;
#s: string;
#v: 27 | 28;
#networkV: null | bigint;
/**
* The ``r`` value for a signature.
*
* This represents the ``x`` coordinate of a "reference" or
* challenge point, from which the ``y`` can be computed.
*/
get r(): string { return this.#r; }
set r(value: BytesLike) {
assertArgument(dataLength(value) === 32, "invalid r", "value", value);
this.#r = hexlify(value);
}
/**
* The ``s`` value for a signature.
*/
get s(): string { return this.#s; }
set s(_value: BytesLike) {
assertArgument(dataLength(_value) === 32, "invalid s", "value", _value);
const value = hexlify(_value);
assertArgument(parseInt(value.substring(0, 3)) < 8, "non-canonical s", "value", value);
this.#s = value;
}
/**
* The ``v`` value for a signature.
*
* Since a given ``x`` value for ``r`` has two possible values for
* its correspondin ``y``, the ``v`` indicates which of the two ``y``
* values to use.
*
* It is normalized to the values ``27`` or ``28`` for legacy
* purposes.
*/
get v(): 27 | 28 { return this.#v; }
set v(value: BigNumberish) {
const v = getNumber(value, "value");
assertArgument(v === 27 || v === 28, "invalid v", "v", value);
this.#v = v;
}
/**
* The EIP-155 ``v`` for legacy transactions. For non-legacy
* transactions, this value is ``null``.
*/
get networkV(): null | bigint { return this.#networkV; }
/**
* The chain ID for EIP-155 legacy transactions. For non-legacy
* transactions, this value is ``null``.
*/
get legacyChainId(): null | bigint {
const v = this.networkV;
if (v == null) { return null; }
return Signature.getChainId(v);
}
/**
* The ``yParity`` for the signature.
*
* See ``v`` for more details on how this value is used.
*/
get yParity(): 0 | 1 {
return (this.v === 27) ? 0: 1;
}
/**
* The [[link-eip-2098]] compact representation of the ``yParity``
* and ``s`` compacted into a single ``bytes32``.
*/
get yParityAndS(): string {
// The EIP-2098 compact representation
const yParityAndS = getBytes(this.s);
if (this.yParity) { yParityAndS[0] |= 0x80; }
return hexlify(yParityAndS);
}
/**
* The [[link-eip-2098]] compact representation.
*/
get compactSerialized(): string {
return concat([ this.r, this.yParityAndS ]);
}
/**
* The serialized representation.
*/
get serialized(): string {
return concat([ this.r, this.s, (this.yParity ? "0x1c": "0x1b") ]);
}
/**
* @private
*/
constructor(guard: any, r: string, s: string, v: 27 | 28) {
assertPrivate(guard, _guard, "Signature");
this.#r = r;
this.#s = s;
this.#v = v;
this.#networkV = null;
}
[Symbol.for('nodejs.util.inspect.custom')](): string {
return `Signature { r: "${ this.r }", s: "${ this.s }", yParity: ${ this.yParity }, networkV: ${ this.networkV } }`;
}
/**
* Returns a new identical [[Signature]].
*/
clone(): Signature {
const clone = new Signature(_guard, this.r, this.s, this.v);
if (this.networkV) { clone.#networkV = this.networkV; }
return clone;
}
/**
* Returns a representation that is compatible with ``JSON.stringify``.
*/
toJSON(): any {
const networkV = this.networkV;
return {
_type: "signature",
networkV: ((networkV != null) ? networkV.toString(): null),
r: this.r, s: this.s, v: this.v,
};
}
/**
* Compute the chain ID from the ``v`` in a legacy EIP-155 transactions.
*
* @example:
* Signature.getChainId(45)
* //_result:
*
* Signature.getChainId(46)
* //_result:
*/
static getChainId(v: BigNumberish): bigint {
const bv = getBigInt(v, "v");
// The v is not an EIP-155 v, so it is the unspecified chain ID
if ((bv == BN_27) || (bv == BN_28)) { return BN_0; }
// Bad value for an EIP-155 v
assertArgument(bv >= BN_35, "invalid EIP-155 v", "v", v);
return (bv - BN_35) / BN_2;
}
/**
* Compute the ``v`` for a chain ID for a legacy EIP-155 transactions.
*
* Legacy transactions which use [[link-eip-155]] hijack the ``v``
* property to include the chain ID.
*
* @example:
* Signature.getChainIdV(5, 27)
* //_result:
*
* Signature.getChainIdV(5, 28)
* //_result:
*
*/
static getChainIdV(chainId: BigNumberish, v: 27 | 28): bigint {
return (getBigInt(chainId) * BN_2) + BigInt(35 + v - 27);
}
/**
* Compute the normalized legacy transaction ``v`` from a ``yParirty``,
* a legacy transaction ``v`` or a legacy [[link-eip-155]] transaction.
*
* @example:
* // The values 0 and 1 imply v is actually yParity
* Signature.getNormalizedV(0)
* //_result:
*
* // Legacy non-EIP-1559 transaction (i.e. 27 or 28)
* Signature.getNormalizedV(27)
* //_result:
*
* // Legacy EIP-155 transaction (i.e. >= 35)
* Signature.getNormalizedV(46)
* //_result:
*
* // Invalid values throw
* Signature.getNormalizedV(5)
* //_error:
*/
static getNormalizedV(v: BigNumberish): 27 | 28 {
const bv = getBigInt(v);
if (bv === BN_0 || bv === BN_27) { return 27; }
if (bv === BN_1 || bv === BN_28) { return 28; }
assertArgument(bv >= BN_35, "invalid v", "v", v);
// Otherwise, EIP-155 v means odd is 27 and even is 28
return (bv & BN_1) ? 27: 28;
}
/**
* Creates a new [[Signature]].
*
* If no %%sig%% is provided, a new [[Signature]] is created
* with default values.
*
* If %%sig%% is a string, it is parsed.
*/
static from(sig?: SignatureLike): Signature {
function assertError(check: unknown, message: string): asserts check {
assertArgument(check, message, "signature", sig);
};
if (sig == null) {
return new Signature(_guard, ZeroHash, ZeroHash, 27);
}
if (typeof(sig) === "string") {
const bytes = getBytes(sig, "signature");
if (bytes.length === 64) {
const r = hexlify(bytes.slice(0, 32));
const s = bytes.slice(32, 64);
const v = (s[0] & 0x80) ? 28: 27;
s[0] &= 0x7f;
return new Signature(_guard, r, hexlify(s), v);
}
if (bytes.length === 65) {
const r = hexlify(bytes.slice(0, 32));
const s = bytes.slice(32, 64);
assertError((s[0] & 0x80) === 0, "non-canonical s");
const v = Signature.getNormalizedV(bytes[64]);
return new Signature(_guard, r, hexlify(s), v);
}
assertError(false, "invalid raw signature length");
}
if (sig instanceof Signature) { return sig.clone(); }
// Get r
const _r = sig.r;
assertError(_r != null, "missing r");
const r = toUint256(_r);
// Get s; by any means necessary (we check consistency below)
const s = (function(s?: string, yParityAndS?: string) {
if (s != null) { return toUint256(s); }
if (yParityAndS != null) {
assertError(isHexString(yParityAndS, 32), "invalid yParityAndS");
const bytes = getBytes(yParityAndS);
bytes[0] &= 0x7f;
return hexlify(bytes);
}
assertError(false, "missing s");
})(sig.s, sig.yParityAndS);
assertError((getBytes(s)[0] & 0x80) == 0, "non-canonical s");
// Get v; by any means necessary (we check consistency below)
const { networkV, v } = (function(_v?: BigNumberish, yParityAndS?: string, yParity?: Numeric): { networkV?: bigint, v: 27 | 28 } {
if (_v != null) {
const v = getBigInt(_v);
return {
networkV: ((v >= BN_35) ? v: undefined),
v: Signature.getNormalizedV(v)
};
}
if (yParityAndS != null) {
assertError(isHexString(yParityAndS, 32), "invalid yParityAndS");
return { v: ((getBytes(yParityAndS)[0] & 0x80) ? 28: 27) };
}
if (yParity != null) {
switch (getNumber(yParity, "sig.yParity")) {
case 0: return { v: 27 };
case 1: return { v: 28 };
}
assertError(false, "invalid yParity");
}
assertError(false, "missing v");
})(sig.v, sig.yParityAndS, sig.yParity);
const result = new Signature(_guard, r, s, v);
if (networkV) { result.#networkV = networkV; }
// If multiple of v, yParity, yParityAndS we given, check they match
assertError(sig.yParity == null || getNumber(sig.yParity, "sig.yParity") === result.yParity, "yParity mismatch");
assertError(sig.yParityAndS == null || sig.yParityAndS === result.yParityAndS, "yParityAndS mismatch");
return result;
}
}
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