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# frozen_string_literal: true
module TokenAuthenticatableStrategies
class EncryptionHelper
DYNAMIC_NONCE_IDENTIFIER = "|"
NONCE_SIZE = 12
def self.decrypt_token(token)
return unless token
# The pattern of the token is "#{DYNAMIC_NONCE_IDENTIFIER}#{token}#{iv_of_12_characters}"
if token.start_with?(DYNAMIC_NONCE_IDENTIFIER) && token.size > NONCE_SIZE + DYNAMIC_NONCE_IDENTIFIER.size
token_to_decrypt = token[1...-NONCE_SIZE]
iv = token[-NONCE_SIZE..]
Gitlab::CryptoHelper.aes256_gcm_decrypt(token_to_decrypt, nonce: iv)
else
Gitlab::CryptoHelper.aes256_gcm_decrypt(token)
end
end
def self.encrypt_token(plaintext_token)
return Gitlab::CryptoHelper.aes256_gcm_encrypt(plaintext_token) unless Feature.enabled?(:dynamic_nonce, type: :ops)
iv = ::Digest::SHA256.hexdigest(plaintext_token).bytes.take(NONCE_SIZE).pack('c*')
token = Gitlab::CryptoHelper.aes256_gcm_encrypt(plaintext_token, nonce: iv)
"#{DYNAMIC_NONCE_IDENTIFIER}#{token}#{iv}"
end
end
end
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