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Blind indexes using ruby
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| require 'rbnacl' | |
| require 'base64' | |
| class Example | |
| attr_reader :secret_box, :index_key | |
| def initialize | |
| key = RbNaCl::Random.random_bytes(RbNaCl::SecretBox.key_bytes) | |
| @index_key = RbNaCl::Random.random_bytes(RbNaCl::SecretBox.key_bytes) | |
| @secret_box = RbNaCl::SecretBox.new(key) | |
| end | |
| def encrypt_ssn(ssn) | |
| nonce = RbNaCl::Random.random_bytes(secret_box.nonce_bytes) | |
| ciphertext = secret_box.encrypt(nonce, ssn) | |
| nonce.concat(ciphertext) | |
| end | |
| def decrypt_ssn(ciphertext) | |
| nonce = ciphertext[0..secret_box.nonce_bytes - 1] | |
| secret_box.decrypt(nonce, ciphertext[secret_box.nonce_bytes..-1]) | |
| end | |
| def get_ssn_blind_index(ssn) | |
| salt = RbNaCl::Hash.blake2b(index_key, digest_size: 16) | |
| # Argon2 CPU and memory cost parameters | |
| opslimit = 5 | |
| memlimit = 7_256_678 | |
| # Size of digest to compute in bytes (default 64) | |
| digest_size = 64 | |
| digest = RbNaCl::PasswordHash.argon2( | |
| ssn, | |
| salt, | |
| opslimit, | |
| memlimit, | |
| digest_size | |
| ) | |
| Base64.encode64(digest) | |
| end | |
| end |
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