Downloaded File: Automated Verification Update I

Ok last time I made a tool that helps with file verification using the checkum of that file entered manually. Now there is another method that is also used and that is the use of a checksum file, usually named MD5SUM or SHA256.

Note both files have to be in the same folder!

I updated my earlier tool:

Downloaded File: Automated Verification

With this version you can enter the name of a file that holds the calculated checksums of the file in question and use that to verify that your file has not been tampered with. It works similar to the other tool but in this case the first step will be to choose either a manual entry or the use of a file for verification.

Here is the updated code:

#!/usr/bin/env bash
set -e
# Create variables to hold the algorithm to use
opt1="sha256"
opt2="md5sum"
aopt1="Use File Authentication"
aopt2="Enter Check Manually"
# Declare the functions to be used
# Create a function to use
# for repeated tasks
function remove_whitespaces {
    
        # Remove white space
        r="$(printf "%s" "$r" | tr -d '[:space:]')"
        # Get the checksum for verification from user
        shasum="$(zenity --height=200 --width=350 --entry --title "Checksum Value" --text "Please enter the checksum" --entry-text "add checksum here")"
        # Remove white space
        shasum="$(printf "%s" "$shasum" | tr -d '[:space:]')"
        
        if [[ "$shasum" == "add checksum here" || "$shasum" == " " ]]
        then
                zenity --error --text "A checksum is required! "
                exit 1
        else
                if [[ "$r" == "$shasum" ]]
                then
                        zenity --info --height=100 --width=100 --title "Success! " --text "The file is ok! "
                        exit 0
                else
                        zenity --height=100 --width=200 --error --text "Checksum mismatch! "
                        exit 1
                fi
        fi
}
function checksumfile_success {
zenity --info --height=100 --width=100 --title "Success! " --text "The file is ok! "
        exit 0
}
function checksumfile_failure {
        zenity --height=100 --width=100 --error --text "Checksume mismatch! "
        exit 1
}
# Decide if a checksum should be entered manually 
# or a checksum file should be used
authtype="$(zenity --height=275 --width=300 --list --radiolist --text "Choose authentication method" --column 'Select...' --column 'Method' FALSE "$aopt1" FALSE "$aopt2")"
if [[ "$authtype" == "$aopt1" ]]
then
        checksumfile="$(zenity --height=200 --width=30 --entry --title "Checksum File Name" --text "Enter the checksum file to use" --entry-text "Enter the filename here")"
        # If user made a choice
        if [[ ! "$checksumfile" == " " ]]
        then
                # Search for file name is present in 
                # current directory
                fexists="$(find . -maxdepth 1 -type f -name "$checksumfile" | wc -l)"
                # If file exists
                if [[ "$fexists" -gt 0 ]]
                then
                        algotype="$(zenity --height=275 --width=300 --list --radiolist --text "Choose Algorithm to Use" --column 'Select...' --column 'Algorithm' FALSE "$opt1"  FALSE "$opt2")"
                        # Remove white space
                        checksumfile="$(printf "%s" "$checksumfile" | tr -d '[:space:]')"
                        # Use selected algorithm
                        if [[ "$algotype" == "$opt1" ]]
                        then
                                # Carry out sha56 on the file
                                result="$(grep -Eo "OK" <<< "$("$algotype" -c "$checksumfile")")"
                                # Check if the file is ok
                                if [[ "$result" == "OK" ]]
                                then
                                        cheksumfile_success
                                else
                                        checksumfile_failure
                                fi
                        elif [[ "$algotype" == "$opt2" ]]
                        then
                                # Do md5sum on the file
                                result="$(grep -Eo "OK" <<<  "$("$algotype" -c "$checksumfile")")"
                                # Check if the file is ok
                                if [[ "$result" == "OK" ]]
                                then
                                        checksumfile_success
                                else
                                        checksumfile_failure
                                fi
                        else
                              exit 1
                        fi
                else
                        exit 1
                fi
        fi
elif [[ "$authtype" == "$aopt2" ]]
then
        algotype="$(zenity --height=275 --width=300 --list --radiolist --text "Choose Algorithm to Use" --column 'Select...' --column 'Algorithm' FALSE "$opt1"  FALSE "$opt2")"
        # Use selected algorithm
        if [[ "$algotype" == "$opt1" ]]
        then
                # Carry out md5sum on the file
                r="$(grep -Eo "^.* " <<< "$($algotype -a "$1")")"
                remove_whitespaces
        elif [[ "$algotype" == "$opt2" ]]
        then
                # Do sha256 on the file
                r="$(grep -Eo "^.* " <<< "$($algotype  "$1")")"
                remove_whitespaces
        else
                exit 1
        fi
else
        exit 1
        
fi
exit 0

This is how you use it: