core_ng/@sammo/crypto/src/ECKey.ts

import type { ECDSA_PKCS8_P384_SignKey, ECDSA_P384_VerifyKey } from "./RawTypes.js";
import { encodePEM } from "./utils.js";

// 간편하게 저장하기 위해서 그냥! 매번 복잡한 일을 하도록 하자

const subtle = globalThis.crypto.subtle;

export const curveName: EcKeyGenParams | EcKeyImportParams = {
	name: 'ECDSA',
	namedCurve: 'P-384'
}

export async function importSignKey(signKey: ECDSA_PKCS8_P384_SignKey, allowExport?: boolean): Promise<CryptoKey> {
	return await subtle.importKey('pkcs8', signKey, curveName, allowExport ?? false, ['sign']);
}

export async function importVerifyKeyRaw(verifyKey: ECDSA_P384_VerifyKey, allowExport?: boolean): Promise<CryptoKey> {
	return await subtle.importKey('raw', verifyKey, curveName, allowExport ?? false, ['verify'])
}

export async function exportVerifyKeyRaw(verifyKey: ECDSA_P384_VerifyKey): Promise<Buffer>{
	const key = await importVerifyKeyRaw(verifyKey);
	return Buffer.from(await subtle.exportKey('raw', key));
}

export async function importVerifyKey(verifyKey: ECDSA_P384_VerifyKey, allowExport?: boolean): Promise<CryptoKey> {
	return await subtle.importKey('spki', verifyKey, curveName, allowExport ?? false, ['verify'])
}


export async function genKey(): Promise<[ECDSA_PKCS8_P384_SignKey, ECDSA_P384_VerifyKey]> {
	const keyPair = await subtle.generateKey(curveName, true, ['sign', 'verify']);
	const signKey = subtle.exportKey('pkcs8', keyPair.privateKey);
	const verifyKey = subtle.exportKey('spki', keyPair.publicKey);
	return [Buffer.from(await signKey), Buffer.from(await verifyKey)];
}

export async function pemFromVerifyKey(verifyKey: ECDSA_P384_VerifyKey): Promise<string> {
	const subtleVerifyKey = await importVerifyKey(verifyKey, true);
	const spkiRaw = await subtle.exportKey('spki', subtleVerifyKey)
	return encodePEM(Buffer.from(spkiRaw), 'PUBLIC KEY');
}

export function pemFromSignKey(signKey: ECDSA_PKCS8_P384_SignKey): string {
	return encodePEM(signKey, 'EC PRIVATE KEY');
}

export async function verifyKeyFromSignKey(signKey: ECDSA_PKCS8_P384_SignKey): Promise<ECDSA_P384_VerifyKey> {
	const subtleSignKey = await importSignKey(signKey, true);
	const jwk = await subtle.exportKey('jwk', subtleSignKey);
	delete jwk.d;
	delete jwk.dp;
	delete jwk.dq;
	delete jwk.q;
	delete jwk.qi;
	jwk.key_ops = ["verify"];

	const subtleVerifyKey = await subtle.importKey('jwk', jwk, curveName, true, ['verify']);
	const verifyKey = await subtle.exportKey('spki', subtleVerifyKey);
	return Buffer.from(verifyKey);
}