import * as crypto from 'crypto';
import {Crypto} from '../crypto';

export class NodeCrypto implements Crypto {
  async sha256DigestBase64(str: string): Promise<string> {
    return crypto.createHash('sha256').update(str).digest('base64');
  }

  randomBytesBase64(count: number): string {
    return crypto.randomBytes(count).toString('base64');
  }

  async verify(
    pubkey: string,
    data: string | Buffer,
    signature: string
  ): Promise<boolean> {
    const verifier = crypto.createVerify('sha256');
    verifier.update(data);
    verifier.end();
    return verifier.verify(pubkey, signature, 'base64');
  }

  async sign(privateKey: string, data: string | Buffer): Promise<string> {
    const signer = crypto.createSign('RSA-SHA256');
    signer.update(data);
    signer.end();
    return signer.sign(privateKey, 'base64');
  }

  decodeBase64StringUtf8(base64: string): string {
    return Buffer.from(base64, 'base64').toString('utf-8');
  }

  encodeBase64StringUtf8(text: string): string {
    return Buffer.from(text, 'utf-8').toString('base64');
  }
}