@nthparty/bcl
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TypeScript library that provides a simple interface for symmetric (i.e., symmetric-key) and asymmetric (i.e., asymmetric-key) encryption/decryption primitives.
43 lines (42 loc) • 1.67 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.Symmetric_init = void 0;
/**
* Symmetric (i.e., secret-key) encryption/decryption primitives.
*/
// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types,@typescript-eslint/no-explicit-any
function Symmetric_init(Sodium, Types) {
const { Secret, Plain, Cipher } = Types;
return class Symmetric {
/**
* Create a secret key.
* @returns {Secret} Secret key.
*/
static secret() {
return new Secret(Sodium.random(32));
}
/**
* Encrypt a plaintext (a bytes-like object) using the supplied secret key.
* @param {Secret} secretKey Secret key.
* @param {Plain} plaintext Message to encrypt.
* @returns {Cipher} Encrypted ciphertext.
*/
static encrypt(secretKey, plaintext) {
const nonce = Sodium.random(24);
const ciphertext = Sodium.secretbox(plaintext, nonce, secretKey);
return new Cipher(new Uint8Array([...nonce, ...ciphertext]));
}
/**
* Decrypt a ciphertext (a bytes-like object) using the supplied secret key.
* @param {Secret} secretKey Secret key.
* @param {Cipher} ciphertext Ciphertext to decrypt.
* @returns {Plain} Decrypted plaintext.
*/
static decrypt(secretKey, ciphertext) {
const nonce = ciphertext.slice(0, 24);
const plaintext = Sodium.secretboxOpen(ciphertext.slice(24), nonce, secretKey);
return new Plain(plaintext);
}
};
}
exports.Symmetric_init = Symmetric_init;