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fea495a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | import crypto from 'crypto';
// Background:
// https://security.stackexchange.com/questions/184305/why-would-i-ever-use-aes-256-cbc-if-aes-256-gcm-is-more-secure
const CIPHER_ALGORITHM = `aes-256-gcm`, CIPHER_KEY_LENGTH = 32, CIPHER_IV_LENGTH = 16, CIPHER_TAG_LENGTH = 16, CIPHER_SALT_LENGTH = 64;
const PBKDF2_ITERATIONS = 100000 // https://support.1password.com/pbkdf2/
;
export function encryptWithSecret(secret, data) {
const iv = crypto.randomBytes(CIPHER_IV_LENGTH);
const salt = crypto.randomBytes(CIPHER_SALT_LENGTH);
// https://nodejs.org/api/crypto.html#crypto_crypto_pbkdf2sync_password_salt_iterations_keylen_digest
const key = crypto.pbkdf2Sync(secret, salt, PBKDF2_ITERATIONS, CIPHER_KEY_LENGTH, `sha512`);
const cipher = crypto.createCipheriv(CIPHER_ALGORITHM, key, iv);
const encrypted = Buffer.concat([
cipher.update(data, `utf8`),
cipher.final()
]);
// https://nodejs.org/api/crypto.html#crypto_cipher_getauthtag
const tag = cipher.getAuthTag();
return Buffer.concat([
// Data as required by:
// Salt for Key: https://nodejs.org/api/crypto.html#crypto_crypto_pbkdf2sync_password_salt_iterations_keylen_digest
// IV: https://nodejs.org/api/crypto.html#crypto_class_decipher
// Tag: https://nodejs.org/api/crypto.html#crypto_decipher_setauthtag_buffer
salt,
iv,
tag,
encrypted
]).toString(`hex`);
}
export function decryptWithSecret(secret, encryptedData) {
const buffer = Buffer.from(encryptedData, `hex`);
const salt = buffer.slice(0, CIPHER_SALT_LENGTH);
const iv = buffer.slice(CIPHER_SALT_LENGTH, CIPHER_SALT_LENGTH + CIPHER_IV_LENGTH);
const tag = buffer.slice(CIPHER_SALT_LENGTH + CIPHER_IV_LENGTH, CIPHER_SALT_LENGTH + CIPHER_IV_LENGTH + CIPHER_TAG_LENGTH);
const encrypted = buffer.slice(CIPHER_SALT_LENGTH + CIPHER_IV_LENGTH + CIPHER_TAG_LENGTH);
// https://nodejs.org/api/crypto.html#crypto_crypto_pbkdf2sync_password_salt_iterations_keylen_digest
const key = crypto.pbkdf2Sync(secret, salt, PBKDF2_ITERATIONS, CIPHER_KEY_LENGTH, `sha512`);
const decipher = crypto.createDecipheriv(CIPHER_ALGORITHM, key, iv);
decipher.setAuthTag(tag);
return decipher.update(encrypted) + decipher.final(`utf8`);
}
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