Document-class:OpenSSL::HMAC

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 toOpenSSL::Digest.

HMAC-SHA256 using one-shot interface¶↑

key ="key"data ="message-to-be-authenticated"mac =OpenSSL::HMAC.hexdigest("SHA256",key,data)#=> "cddb0db23f469c8bf072b21fd837149bd6ace9ab771cceef14c9e517cc93282e"

HMAC-SHA256 using incremental interface¶↑

data1 =File.binread("file1")data2 =File.binread("file2")key ="key"hmac =OpenSSL::HMAC.new(key,'SHA256')hmac<<data1hmac<<data2mac =hmac.digest