5b9ad8da90
* Move next-server directory files to server directory * Update tests * Update paths in other places
77 lines
2.4 KiB
TypeScript
77 lines
2.4 KiB
TypeScript
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`,
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CIPHER_KEY_LENGTH = 32, // https://stackoverflow.com/a/28307668/4397028
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CIPHER_IV_LENGTH = 16, // https://stackoverflow.com/a/28307668/4397028
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CIPHER_TAG_LENGTH = 16,
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CIPHER_SALT_LENGTH = 64
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const PBKDF2_ITERATIONS = 100_000 // https://support.1password.com/pbkdf2/
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export function encryptWithSecret(secret: Buffer, data: string): string {
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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(
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secret,
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salt,
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PBKDF2_ITERATIONS,
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CIPHER_KEY_LENGTH,
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`sha512`
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)
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const cipher = crypto.createCipheriv(CIPHER_ALGORITHM, key, iv)
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const encrypted = Buffer.concat([cipher.update(data, `utf8`), cipher.final()])
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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(
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secret: Buffer,
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encryptedData: string
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): string {
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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(
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CIPHER_SALT_LENGTH,
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CIPHER_SALT_LENGTH + CIPHER_IV_LENGTH
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)
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const tag = buffer.slice(
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CIPHER_SALT_LENGTH + CIPHER_IV_LENGTH,
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CIPHER_SALT_LENGTH + CIPHER_IV_LENGTH + CIPHER_TAG_LENGTH
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)
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const encrypted = buffer.slice(
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CIPHER_SALT_LENGTH + CIPHER_IV_LENGTH + CIPHER_TAG_LENGTH
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)
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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(
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secret,
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salt,
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PBKDF2_ITERATIONS,
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CIPHER_KEY_LENGTH,
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`sha512`
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)
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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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