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Blind indexes using ruby (as per https://paragonie.com/blog/2017/05/building-searchable-encrypted-databases-with-php-and-sql)
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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).unpack('H*').first | |
end | |
def decrypt_ssn(ciphertext) | |
ciphertext = [ciphertext].pack('H*') | |
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) | |
digest = RbNaCl::PasswordHash.argon2( | |
ssn, | |
salt, | |
RbNaCl::PasswordHash::Argon2::OPSLIMIT_INTERACTIVE, | |
RbNaCl::PasswordHash::Argon2::MEMLIMIT_INTERACTIVE, | |
33 | |
) | |
digest.unpack('H*').first | |
end | |
end |
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