OpenSSL::HMACError has not been discovered yet
OpenSSL::HMAC allows computing Hash-based Message Authentication Code (HMAC). It is a type of message authentication code (MAC) involving a hash function in combination with a key. HMAC can be used to verify the integrity of a message as well as the authenticity.
OpenSSL::HMAC has a similar interface to OpenSSL::Digest.
key = "key" data = "message-to-be-authenticated" mac = OpenSSL::HMAC.hexdigest("SHA256", key, data) #=> "cddb0db23f469c8bf072b21fd837149bd6ace9ab771cceef14c9e517cc93282e"
data1 = File.read("file1") data2 = File.read("file2") key = "key" digest = OpenSSL::Digest::SHA256.new hmac = OpenSSL::HMAC.new(key, digest) hmac << data1 hmac << data2 mac = hmac.digest