Cryptographic hash script

[smasher]

I got tired of typing "openssl sha1" every time I needed to hash a file, so I wrote a script to hash files and stdin using the following hashes: sha1, sha224, sha256, sha384, sha512, sha, ripemd160, md5, md4, whirlpool

Here's the script:

#!/bin/sh

case $( basename ${0} ) in
    sha1|sha1sum)
        hash=sha1
        ;;
    sha224|sha224sum)
        hash=sha224
        ;;
    sha256|sha256sum)
        hash=sha256
        ;;
    sha384|sha384sum)
        hash=sha384
        ;;
    sha512|sha512sum)
        hash=sha512
        ;;
    sha|shasum)
        hash=sha
        ;;
    ripemd160)
        hash=ripemd160
        ;;
    ripemd)
        hash=ripemd
        ;;
    md5|md5sum)
        hash=md5
        ;;
    md4|md4sum)
        hash=md4
        ;;
    whirlpool)
        hash=whirlpool
        ;;
    *)
        hash=sha1
        ;;
esac

unset fault_status

for n in "${@}"
do
    ## test the file exists
    [ -e "${n}" ] || {
        echo "${n}: No such file or directory" 1>&2
        fault_status=1
        continue
    }
    ## test the file can be read
    [ -r "${n}" ] || {
        echo "${n}: Permission denied" 1>&2
        fault_status=1
        continue
    }
    openssl_hash=$( openssl ${hash} "${n}" )
    echo -n ${openssl_hash##*?=}'  '
    echo ${openssl_hash%)=?*} | cut -d'(' -f2-
done

## test if there's input being piped in
[ -t 0 ] || {
        openssl_hash=$( openssl ${hash} )
        echo ${openssl_hash##*?=}'  -'
}

## non-zero exit status indicates one or more files could not be read
## this test lets the script exit with the proper return status
[ 0 -eq ${fault_status:=0} ]

Install that as "/jffs/bin/sha1", then create symlinks to it:

ln -vs /jffs/bin/sha1 /jffs/bin/md4
ln -vs /jffs/bin/sha1 /jffs/bin/md4sum
ln -vs /jffs/bin/sha1 /jffs/bin/md5
ln -vs /jffs/bin/sha1 /jffs/bin/md5sum
ln -vs /jffs/bin/sha1 /jffs/bin/ripemd
ln -vs /jffs/bin/sha1 /jffs/bin/ripemd160
ln -vs /jffs/bin/sha1 /jffs/bin/sha1sum
ln -vs /jffs/bin/sha1 /jffs/bin/sha224
ln -vs /jffs/bin/sha1 /jffs/bin/sha224sum
ln -vs /jffs/bin/sha1 /jffs/bin/sha256
ln -vs /jffs/bin/sha1 /jffs/bin/sha256sum
ln -vs /jffs/bin/sha1 /jffs/bin/sha384
ln -vs /jffs/bin/sha1 /jffs/bin/sha384sum
ln -vs /jffs/bin/sha1 /jffs/bin/sha512
ln -vs /jffs/bin/sha1 /jffs/bin/sha512sum
ln -vs /jffs/bin/sha1 /jffs/bin/sha
ln -vs /jffs/bin/sha1 /jffs/bin/shasum
ln -vs /jffs/bin/sha1 /jffs/bin/whirlpool

Now, running the script with any of those names will produce expected results.

For ease of use, set PATH to

PATH=${PATH}:/jffs/bin

Tested and working spectacularly on an AC68U.