EncryptX v3

#!/bin/bash

readonly LOG_FILE="encryption_log.txt"
readonly ENCRYPTED_EXT=".enc"

log_activity() {
  local level=$1
  local message=$2
  exec 3>>"$LOG_FILE"
  echo "$(date '+%Y-%m-%d %H:%M:%S') - [$level] - $message" >&3
  exec 3>&-
}

file_exists() {
  if [ ! -f "$1" ]; then
    log_activity "ERROR" "File $1 does not exist."
    echo "Error: File does not exist."
    exit 1
  fi
}

generate_secure_pass() {
  openssl rand -base64 32
}

encrypt_file() {
  file_exists "$1"
  local encryption_pass=$(generate_secure_pass)
  echo "Encryption password: $encryption_pass"
  openssl enc -aes-256-cbc -salt -in "$1" -out "$1$ENCRYPTED_EXT" -pass pass:"$encryption_pass" 2> /dev/null
  if [ $? -eq 0 ]; then
    echo "File encrypted successfully: $1$ENCRYPTED_EXT"
    log_activity "INFO" "File $1 encrypted successfully."
  else
    echo "Encryption failed. Please check the file and try again."
    log_activity "ERROR" "Encryption failed for file $1."
  fi
}

decrypt_file() {
  file_exists "$1$ENCRYPTED_EXT"
  read -s -p "Please enter the decryption password: " decryption_pass
  echo
  openssl enc -aes-256-cbc -d -salt -in "$1$ENCRYPTED_EXT" -out "$1" -pass pass:"$decryption_pass" 2> /dev/null
  if [ $? -eq 0 ]; then
    echo "File decrypted successfully: $1"
    log_activity "INFO" "File $1 decrypted successfully."
  else
    echo "Decryption failed. Please check the password or file and try again."
    log_activity "ERROR" "Decryption failed for file $1."
  fi
}

if [ $# -eq 0 ]; then
  log_activity "ERROR" "No file specified."
  echo "Usage: $0 --encrypt|--decrypt filename"
  exit 1
fi

action=$1
file=$2

case $action in
  -e|--encrypt)
    encrypt_file "$file"
    ;;
  -d|--decrypt)
    decrypt_file "$file"
    ;;
  *)
    log_activity "ERROR" "Invalid option: $action"
    echo "Invalid option: $action"
    echo "Usage: $0 --encrypt|--decrypt filename"
    exit 1
    ;;
esac