51 lines
1.4 KiB
TypeScript
51 lines
1.4 KiB
TypeScript
import * as blst from "@chainsafe/blst";
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import {bytesToHex, hexToBytes, isZeroUint8Array, randomBytes} from "../helpers/index.js";
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import {SECRET_KEY_LENGTH} from "../constants.js";
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import {SecretKey as ISecretKey} from "../types.js";
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import {PublicKey} from "./publicKey.js";
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import {Signature} from "./signature.js";
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import {ZeroSecretKeyError} from "../errors.js";
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export class SecretKey implements ISecretKey {
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readonly value: blst.SecretKey;
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constructor(value: blst.SecretKey) {
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this.value = value;
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}
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static fromBytes(bytes: Uint8Array): SecretKey {
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// draft-irtf-cfrg-bls-signature-04 does not allow SK == 0
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if (isZeroUint8Array(bytes)) {
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throw new ZeroSecretKeyError();
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}
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const sk = blst.SecretKey.fromBytes(bytes);
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return new SecretKey(sk);
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}
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static fromHex(hex: string): SecretKey {
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return this.fromBytes(hexToBytes(hex));
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}
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static fromKeygen(entropy?: Uint8Array): SecretKey {
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const sk = blst.SecretKey.fromKeygen(entropy || randomBytes(SECRET_KEY_LENGTH));
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return new SecretKey(sk);
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}
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sign(message: Uint8Array): Signature {
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return new Signature(this.value.sign(message).value);
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}
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toPublicKey(): PublicKey {
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const pk = this.value.toPublicKey();
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return new PublicKey(pk.value);
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}
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toBytes(): Uint8Array {
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return this.value.toBytes();
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}
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toHex(): string {
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return bytesToHex(this.toBytes());
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}
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}
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