@shockpkg/ria-packager/esm/security/key/private/rsa.mjs

Package for creating Adobe AIR packages

import forge from 'node-forge';
import { SecurityKeyPrivate } from "../private.mjs";

/**
 * SecurityKeyPrivateRsa object.
 */
export class SecurityKeyPrivateRsa extends SecurityKeyPrivate {
  /**
   * RSA private key in PEM format.
   */

  /**
   * SecurityKeyPrivateRsa constructor.
   *
   * @param privateKey RSA private key in PEM format.
   */
  constructor(privateKey) {
    super();
    this._privateKey = privateKey;
  }

  /**
   * Sign data.
   *
   * @param data Data to be signed.
   * @param digest Digest algorithm.
   * @returns The signature.
   */
  sign(data, digest) {
    const privateKey = forge.pki.privateKeyFromPem(this._privateKey);
    digest = digest.toLowerCase();
    let md;
    switch (digest) {
      case 'sha1':
        {
          md = forge.md.sha1.create();
          break;
        }
      case 'sha256':
        {
          md = forge.md.sha256.create();
          break;
        }
      default:
        {
          throw new Error(`Unsupported digest algorithm: ${digest}`);
        }
    }

    // eslint-disable-next-line unicorn/prefer-code-point
    md.update(String.fromCharCode(...data));
    const signature = privateKey.sign(md, 'RSASSA-PKCS1-V1_5');
    return forge.util.binary.raw.decode(signature);
  }
}
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