@guarani/jose
Version:
Implementation of the RFCs of the JOSE Working Group.
51 lines (50 loc) • 2.1 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.dir = void 0;
const invalid_json_web_encryption_exception_1 = require("../../../exceptions/invalid-json-web-encryption.exception");
const jsonwebencryption_keywrap_algorithm_1 = require("./jsonwebencryption-keywrap.algorithm");
/**
* Implementation of the dir JSON Web Encryption Key Wrap Algorithm.
*/
class DirKeyWrapAlgorithm extends jsonwebencryption_keywrap_algorithm_1.JsonWebEncryptionKeyWrapAlgorithm {
/**
* Instantiates a new JSON Web Encryption dir Key Wrap Algorithm to Wrap and Unwrap Content Encryption Keys.
*/
constructor() {
super('dir', 'oct');
}
/**
* Returns an empty Buffer since the Algorithm does not Wrap the provided Content Encryption Key.
*
* @param enc JSON Web Encryption Content Encryption Algorithm.
* @param key JSON Web Key to be used as the Content Encryption Key used to Encrypt the Plaintext.
* @returns Empty Buffer as the Wrapped Content Encryption Key.
*/
async wrap(enc, key) {
this.validateJsonWebKey(key);
const cek = key.export({ encoding: 'buffer' });
const ek = Buffer.alloc(0);
enc.validateContentEncryptionKey(cek);
return { cek, ek };
}
/**
* Returns the provided JSON Web Key as the Content Encryption Key.
*
* @param enc JSON Web Encryption Content Encryption Algorithm.
* @param key JSON Web Key used as the Content Encryption Key.
* @param ek ~Wrapped Content Encryption Key~.
* @returns Provided JSON Web Key as the Content Encryption Key.
*/
async unwrap(enc, key, ek) {
if (ek.length !== 0) {
throw new invalid_json_web_encryption_exception_1.InvalidJsonWebEncryptionException('Expected the Encrypted Content Encryption Key to be empty.');
}
const cek = key.export({ encoding: 'buffer' });
enc.validateContentEncryptionKey(cek);
return cek;
}
}
/**
* Direct use of a shared symmetric key as the CEK.
*/
exports.dir = new DirKeyWrapAlgorithm();