password and hash generation with apg, htpasswd/bcrypt

passnhash.bash

#!/bin/bash
# password and hash pair generation with apg, htpasswd/bcrypt
# usage:
#   source this file or include the passnhash function in your .bash_profile/.bashrc
#   then: `passnhash 0:35:500:14`

# prerequisites:
# 1) recent version of htpasswd that supports bcrypt (-B flag)
#      deb: `apt-get install apache2-utils`
#      mac: `brew install 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 ALG=$(echo "$@" | awk -F: '{ print $1 }')
    local LEN=$(echo "$@" | awk -F: '{ print $2 }')
    local RND=$(echo "$@" | awk -F: '{ print $3 }')
    local CST=$(echo "$@" | awk -F: '{ print $4 }')
    local PAS=$(apg -a "$ALG" -m "$LEN" -n "$RND" | tail -n 1)
    # "username" is a placeholder value since we're only interested in the hash
    local HAS=$(echo "$PAS" | htpasswd -n -i -B -C "$CST" username | tr -d '\n' | awk -F: '{ print $2 }')
    printf "password: %s\nhash: %s\n" "$PAS" "$HAS"
}