class HTTPClient::OAuth

def sign_hmac_sha1(config, base_string)
  unless SSLEnabled
    raise ConfigurationError.new("openssl required for OAuth implementation")
  end
  key = [escape(config.consumer_secret.to_s), escape(config.secret.to_s)].join('&')
  digester = OpenSSL::Digest::SHA1.new
  [OpenSSL::HMAC.digest(digester, key, base_string)].pack('m*').chomp
end