```{index} single: add (Digest::SHA1) ``` ```{index} single: Digest::SHA1::add ``` # add Append data to the message being hashed. Every argument is taken as bytes; a string holding a character above U+00FF dies "Wide character in subroutine entry". Returns the object, so calls chain. ## Synopsis ```perl $ctx->add($chunk1, $chunk2)->add($chunk3); ```