43 lines
2.3 KiB
JavaScript
43 lines
2.3 KiB
JavaScript
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import crypto from "crypto";
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// Background:
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// https://security.stackexchange.com/questions/184305/why-would-i-ever-use-aes-256-cbc-if-aes-256-gcm-is-more-secure
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const CIPHER_ALGORITHM = `aes-256-gcm`, CIPHER_KEY_LENGTH = 32, CIPHER_IV_LENGTH = 16, CIPHER_TAG_LENGTH = 16, CIPHER_SALT_LENGTH = 64;
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const PBKDF2_ITERATIONS = 100000 // https://support.1password.com/pbkdf2/
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;
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export function encryptWithSecret(secret, data) {
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const iv = crypto.randomBytes(CIPHER_IV_LENGTH);
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const salt = crypto.randomBytes(CIPHER_SALT_LENGTH);
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// https://nodejs.org/api/crypto.html#crypto_crypto_pbkdf2sync_password_salt_iterations_keylen_digest
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const key = crypto.pbkdf2Sync(secret, salt, PBKDF2_ITERATIONS, CIPHER_KEY_LENGTH, `sha512`);
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const cipher = crypto.createCipheriv(CIPHER_ALGORITHM, key, iv);
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const encrypted = Buffer.concat([
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cipher.update(data, `utf8`),
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cipher.final()
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]);
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// https://nodejs.org/api/crypto.html#crypto_cipher_getauthtag
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const tag = cipher.getAuthTag();
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return Buffer.concat([
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// Data as required by:
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// Salt for Key: https://nodejs.org/api/crypto.html#crypto_crypto_pbkdf2sync_password_salt_iterations_keylen_digest
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// IV: https://nodejs.org/api/crypto.html#crypto_class_decipher
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// Tag: https://nodejs.org/api/crypto.html#crypto_decipher_setauthtag_buffer
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salt,
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iv,
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tag,
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encrypted
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]).toString(`hex`);
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}
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export function decryptWithSecret(secret, encryptedData) {
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const buffer = Buffer.from(encryptedData, `hex`);
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const salt = buffer.slice(0, CIPHER_SALT_LENGTH);
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const iv = buffer.slice(CIPHER_SALT_LENGTH, CIPHER_SALT_LENGTH + CIPHER_IV_LENGTH);
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const tag = buffer.slice(CIPHER_SALT_LENGTH + CIPHER_IV_LENGTH, CIPHER_SALT_LENGTH + CIPHER_IV_LENGTH + CIPHER_TAG_LENGTH);
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const encrypted = buffer.slice(CIPHER_SALT_LENGTH + CIPHER_IV_LENGTH + CIPHER_TAG_LENGTH);
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// https://nodejs.org/api/crypto.html#crypto_crypto_pbkdf2sync_password_salt_iterations_keylen_digest
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const key = crypto.pbkdf2Sync(secret, salt, PBKDF2_ITERATIONS, CIPHER_KEY_LENGTH, `sha512`);
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const decipher = crypto.createDecipheriv(CIPHER_ALGORITHM, key, iv);
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decipher.setAuthTag(tag);
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return decipher.update(encrypted) + decipher.final(`utf8`);
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}
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//# sourceMappingURL=crypto-utils.js.map
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