65 lines
1.6 KiB
TypeScript
65 lines
1.6 KiB
TypeScript
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import {BIG} from "@chainsafe/milagro-crypto-js/src/big";
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import {FP_POINT_LENGTH, SECRET_KEY_LENGTH} from "./constants";
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import assert from "assert";
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import ctx from "./ctx";
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import {padLeft} from "./helpers/utils";
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import {G2point} from "./helpers/g2point";
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import * as random from "secure-random";
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import {BLSDomain, BLSSecretKey, bytes32} from "./types";
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export class PrivateKey {
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private value: BIG;
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public constructor(value: BIG) {
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this.value = value;
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}
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public getValue(): BIG {
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return this.value;
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}
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public sign(message: G2point): G2point {
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return message.mul(this.value);
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}
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public signMessage(message: bytes32, domain: BLSDomain): G2point {
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return G2point.hashToG2(message, domain).mul(this.value);
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}
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public toBytes(): BLSSecretKey {
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const buffer = Buffer.alloc(FP_POINT_LENGTH, 0);
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this.value.tobytearray(buffer, 0);
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return buffer.slice(FP_POINT_LENGTH - SECRET_KEY_LENGTH);
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}
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public toHexString(): string {
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return `0x${this.toBytes().toString('hex')}`;
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}
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public static fromBytes(bytes: Uint8Array): PrivateKey {
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assert(bytes.length === SECRET_KEY_LENGTH, 'Private key should have 32 bytes');
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const value = Buffer.from(bytes);
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return new PrivateKey(
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ctx.BIG.frombytearray(
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padLeft(
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value,
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48
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),
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0
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)
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)
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}
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public static fromHexString(value: string): PrivateKey {
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return PrivateKey.fromBytes(
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Buffer.from(value.replace('0x', ''), 'hex')
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);
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}
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public static random(): PrivateKey {
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return PrivateKey.fromBytes(random.randomBuffer(SECRET_KEY_LENGTH));
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}
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}
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