#!/bin/zsh
# tarhash [--HASH] ARCHIVES... - hash files in archives without extracting

HASH=sha1
case "$1" in
  --md5|--rmd160|--sha1|--sha256|--sha384|--sha512) HASH=${1#--}; shift
esac

for archive; do
  bsdtar -cf - --format mtree --options mtree:$HASH @- <$archive |
    while read -r -A line; do
      [[ $line[-1] == ${HASH}digest=* ]] &&
        print "${line[-1]#${HASH}digest=}  ${(g:o:)line[1]}"
    done  
done