Just a little hash generator for cli

hashgen.sh

#!/usr/bin/env bash


VERSION="0.1"


function usage
{
    echo "hashgen v${VERSION}"
    echo "Usage: hashgen [-m hashmethod] [-c config] [-s salt] [-h] string_to_hash"
    echo "Options:"
    echo "  -m hashmethod   Defines the Hash Function to be used. Default is sha265"
    echo "  -c config	    Uses a config to define the paramters"
    echo "  -s salt	    Defines a salt that the hash function should use"
    echo "  -h		    Prints this help"
}

function generate_hash
{
    method=$1
    string=$2
    salt=$3

    echo -n "${string}${salt}" | openssl dgst -$method | awk '{print $2}'
}

function get_value_from_config
{
    config=$1
    name=$2

    grep "$name=" "$config" | awk '{split($0,a,"="); print a[2]}'
}

method="sha256"
config=''
salt=''
forceMethod=''
forceSalt=''

while getopts ":m:c:sh" o; do
    case "${o}" in
	m)
	    forceMethod=${OPTARG}
	    ;;
	c)
	    config=${OPTARG}
	    if [[ -f $config ]]; then
		method=$(get_value_from_config "$config" "method")
		salt=$(get_value_from_config "$config" "salt")
	    else
		echo "config not found, ignoring -c"
	    fi
	    ;;
	s)
	    forceSalt=${OPTARG}
	    ;;
	*)
	    usage
	    exit
	    ;;
    esac
done

shift $((OPTIND-1))

if [[ "$forceSalt" != "" ]] ; then
    salt=$forceSalt
fi

if [[ "$forceMethod" != "" ]] ; then
    method=$forceMethod
fi

string_to_hash=$1

generate_hash "$method" "$string_to_hash" "$salt"