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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::CryptoHelper do
describe '.sha256' do
it 'generates SHA256 digest Base46 encoded' do
digest = described_class.sha256('some-value')
expect(digest).to match %r{\A[A-Za-z0-9+/=]+\z}
expect(digest).to eq digest.strip
end
end
describe '.aes256_gcm_encrypt' do
it 'is Base64 encoded string without new line character' do
encrypted = described_class.aes256_gcm_encrypt('some-value')
expect(encrypted).to match %r{\A[A-Za-z0-9+/=]+\z}
expect(encrypted).not_to include "\n"
end
it 'does not save hashed token with iv value in database' do
expect { described_class.aes256_gcm_encrypt('some-value') }.not_to change { TokenWithIv.count }
end
it 'encrypts using static iv' do
expect(Encryptor).to receive(:encrypt).with(described_class::AES256_GCM_OPTIONS.merge(value: 'some-value', iv: described_class::AES256_GCM_IV_STATIC)).and_return('hashed_value')
described_class.aes256_gcm_encrypt('some-value')
end
end
describe '.aes256_gcm_decrypt' do
before do
stub_feature_flags(dynamic_nonce_creation: false)
end
context 'when token was encrypted using static nonce' do
let(:encrypted) { described_class.aes256_gcm_encrypt('some-value', nonce: described_class::AES256_GCM_IV_STATIC) }
it 'correctly decrypts encrypted string' do
decrypted = described_class.aes256_gcm_decrypt(encrypted)
expect(decrypted).to eq 'some-value'
end
it 'decrypts a value when it ends with a new line character' do
decrypted = described_class.aes256_gcm_decrypt(encrypted + "\n")
expect(decrypted).to eq 'some-value'
end
it 'does not save hashed token with iv value in database' do
expect { described_class.aes256_gcm_decrypt(encrypted) }.not_to change { TokenWithIv.count }
end
context 'with feature flag switched on' do
before do
stub_feature_flags(dynamic_nonce_creation: true)
end
it 'correctly decrypts encrypted string' do
decrypted = described_class.aes256_gcm_decrypt(encrypted)
expect(decrypted).to eq 'some-value'
end
end
end
context 'when token was encrypted using random nonce' do
let(:value) { 'random-value' }
# for compatibility with tokens encrypted using dynamic nonce
let!(:encrypted) do
iv = create_nonce
encrypted_token = described_class.create_encrypted_token(value, iv)
TokenWithIv.create!(hashed_token: Digest::SHA256.digest(encrypted_token), hashed_plaintext_token: Digest::SHA256.digest(encrypted_token), iv: iv)
encrypted_token
end
before do
stub_feature_flags(dynamic_nonce_creation: true)
end
it 'correctly decrypts encrypted string' do
decrypted = described_class.aes256_gcm_decrypt(encrypted)
expect(decrypted).to eq value
end
it 'does not save hashed token with iv value in database' do
expect { described_class.aes256_gcm_decrypt(encrypted) }.not_to change { TokenWithIv.count }
end
end
end
def create_nonce
cipher = OpenSSL::Cipher.new('aes-256-gcm')
cipher.encrypt # Required before '#random_iv' can be called
cipher.random_iv # Ensures that the IV is the correct length respective to the algorithm used.
end
end
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