require 'oauth/signature/base'

module OAuth::Signature::HMAC
  class SHA256 < OAuth::Signature::Base
    implements 'hmac-sha256'

    def body_hash
      Base64.encode64(OpenSSL::Digest::SHA256.digest(request.body || '')).chomp.gsub(/\n/,'')
    end

    private

    def digest
      OpenSSL::HMAC.digest(OpenSSL::Digest.new('sha256'), secret, signature_base_string)
    end
  end
end