password and hash generation with apg, htpasswd/bcrypt

passnhash.bash

#!/bin/bash
# password and hash pair generation with apg, htpasswd/bcrypt

# example usage:
#   source this file or include the passnhash function in your .bash_profile/.bashrc
#   then: `passnhash 0 35 14`

# prerequisites:
# 1) recent version of htpasswd that supports bcrypt (-B flag)
#      deb: `apt-get install apache2-utils`
#      mac: `brew install homebrew/apache/httpd24`
# 2) apg
#      deb: `apt-get install apg`
#      mac: `brew install apg`
 
# be thoughtful if/when outputting to the terminal instead of a file
 
function passnhash () {
    local ALGO=$1
    local LENG=$2
    local COST=$3
    local PASS=$(apg -a "$ALGO" -m "$LENG" -n 1)
    # "username" is a placeholder value since we're only interested in the hash
    local HASH=$(echo "$PASS" | htpasswd -n -i -B -C "$COST" username | tr -d '\n' | awk -F: '{ print $2 }')
    printf "pass: %s\nhash: %s\n" "$PASS" "$HASH"
}