Support for the Ruby 2.4 series has ended. See here for reference.
Authenticator for the “DIGEST-MD5” authentication type. See authenticate().
# File net/imap.rb, line 3500 def process(challenge) case @stage when STAGE_ONE @stage = STAGE_TWO sparams = {} c = StringScanner.new(challenge) while c.scan(/(?:\s*,)?\s*(\w+)=("(?:[^\\"]+|\\.)*"|[^,]+)\s*/) k, v = c[1], c[2] if v =~ /^"(.*)"$/ v = $1 if v =~ /,/ v = v.split(',') end end sparams[k] = v end raise DataFormatError, "Bad Challenge: '#{challenge}'" unless c.rest.size == 0 raise Error, "Server does not support auth (qop = #{sparams['qop'].join(',')})" unless sparams['qop'].include?("auth") response = { :nonce => sparams['nonce'], :username => @user, :realm => sparams['realm'], :cnonce => Digest::MD5.hexdigest("%.15f:%.15f:%d" % [Time.now.to_f, rand, Process.pid.to_s]), :'digest-uri' => 'imap/' + sparams['realm'], :qop => 'auth', :maxbuf => 65535, :nc => "%08d" % nc(sparams['nonce']), :charset => sparams['charset'], } response[:authzid] = @authname unless @authname.nil? # now, the real thing a0 = Digest::MD5.digest( [ response.values_at(:username, :realm), @password ].join(':') ) a1 = [ a0, response.values_at(:nonce,:cnonce) ].join(':') a1 << ':' + response[:authzid] unless response[:authzid].nil? a2 = "AUTHENTICATE:" + response[:'digest-uri'] a2 << ":00000000000000000000000000000000" if response[:qop] and response[:qop] =~ /^auth-(?:conf|int)$/ response[:response] = Digest::MD5.hexdigest( [ Digest::MD5.hexdigest(a1), response.values_at(:nonce, :nc, :cnonce, :qop), Digest::MD5.hexdigest(a2) ].join(':') ) return response.keys.map {|key| qdval(key.to_s, response[key]) }.join(',') when STAGE_TWO @stage = nil # if at the second stage, return an empty string if challenge =~ /rspauth=/ return '' else raise ResponseParseError, challenge end else raise ResponseParseError, challenge end end