File (de)encryption using openssl

functions.sh

# Encryption and decryption BASH functions using openssl
function decrypt() {
  # The first param doesn't contain .enc, write output plus .decrypted if no 2nd
  if [ "${1/.enc/}" = "${1}" -a -e "${1}" ]; then
    openssl enc -d -aes-256-cbc -in "${1}" -out "${2:-${1}.decrypted}"

  # The first param contains .enc, write the output without if no 2nd param
  elif [ "${1/.enc/}" != "${1}" -a -e "${1}" ]; then
    openssl enc -d -aes-256-cbc -in "${1}" -out "${2:-${1/.enc/}}"

  # Just accept first and second an fail if necessary
  else
    openssl enc -d -aes-256-cbc -in "${1}" -out "${2}"
  fi
}

function encrypt() {
  # The first param doesn't contain .enc, write output plus .enc if no 2nd
  if [ "${1/.enc/}" = "${1}" -a -e "${1}" ]; then
    openssl enc -salt -aes-256-cbc -in "${1}" -out "${2:-${1}.enc}"

  # Just accept first and second an fail if necessary
  else
    openssl enc -salt -aes-256-cbc -in "${1}" -out "${2}"
  fi
}

To use,

cat functions.sh >> .bashrc