Batch Password Derivation Utility

Build a utility that efficiently derives cryptographic keys from multiple passwords using memory-efficient array operations.

Requirements

Your utility should process a list of passwords and derive keys for each one, handling the array-based inputs and outputs efficiently to minimize memory overhead.

Core Functionality

Implement a function deriveKeys that:

• Accepts an array of password strings
• Accepts a salt string
• Returns an array of derived keys in hexadecimal format

Each derived key should be 32 bytes long and use the following scrypt parameters:

• N = 1024 (CPU/memory cost)
• r = 8 (block size)
• p = 1 (parallelization)

Input Handling

• Convert password and salt strings to appropriate byte array formats
• Handle the conversion between JavaScript strings and typed arrays efficiently
• Ensure proper encoding of Unicode characters

Output Format

• Return derived keys as hexadecimal strings
• Convert the typed array output to hexadecimal format
• Each hex string should represent the full 32-byte key

Test Cases

• Given passwords ["password1", "password2"] and salt "salt123", the function returns an array of two 64-character hexadecimal strings (32 bytes = 64 hex chars). @test
• Given an empty password array [] and any salt, the function returns an empty array. @test
• Given passwords ["test"] and salt "sea", the derived key has exactly 64 hexadecimal characters. @test

Implementation

@generates

API

/**
 * Derives cryptographic keys from multiple passwords using scrypt.
 * Uses memory-efficient array operations for conversion and processing.
 *
 * @param {string[]} passwords - Array of password strings to derive keys from
 * @param {string} salt - Salt string used for all derivations
 * @returns {Promise<string[]>} Promise resolving to array of derived keys in hexadecimal format
 */
async function deriveKeys(passwords, salt) {
  // Implementation
}

module.exports = { deriveKeys };

Dependencies { .dependencies }

scrypt-js { .dependency }

Provides password-based key derivation functionality.