134 lines
2.7 KiB
Bash
134 lines
2.7 KiB
Bash
# Caesar ciphering, for ciphering It. Don't encrypt things like this, kids!!!'
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# The good thing Is that you can very easily just swap the key that's by default 4 to something more main-stream like a 7'
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caesar_cipher() {
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local input="$1"
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local key=4
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local result=""
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for (( i=0; i<${#input}; i++ )); do
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char="${input:i:1}"
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if [[ "$char" =~ [a-z] ]]; then
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shifted=$(printf "%d" "'$char")
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shifted=$((shifted + key))
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if (( shifted > 122 )); then
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shifted=$((shifted - 26))
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fi
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result+=$(printf "\\$(printf %o $shifted)")
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elif [[ "$char" =~ [A-Z] ]]; then
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shifted=$(printf "%d" "'$char")
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shifted=$((shifted + key))
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if (( shifted > 90 )); then
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shifted=$((shifted - 26))
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fi
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result+=$(printf "\\$(printf %o $shifted)")
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else
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result+="$char"
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fi
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done
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echo "$result"
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}
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# This is the caesar decipher, helps with reading the files
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caesar_decipher() {
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local input="$1"
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local key=4
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local result=""
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for (( i=0; i<${#input}; i++ )); do
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char="${input:i:1}"
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if [[ "$char" =~ [a-z] ]]; then
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shifted=$(printf "%d" "'$char")
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shifted=$((shifted - key))
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# Wrap around if necessary
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if (( shifted < 97 )); then
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shifted=$((shifted + 26))
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fi
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result+=$(printf "\\$(printf %o $shifted)")
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elif [[ "$char" =~ [A-Z] ]]; then
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shifted=$(printf "%d" "'$char")
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shifted=$((shifted - key))
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if (( shifted < 65 )); then
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shifted=$((shifted + 26))
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fi
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result+=$(printf "\\$(printf %o $shifted)")
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else
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result+="$char"
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fi
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done
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echo "$result"
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}
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echo "Enter file name without extension:"
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read filename
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filename="${filename}.dan"
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echo "Save - CTRL + D"
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input_text=$(cat)
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ciphered_text=$(caesar_cipher "$input_text")
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echo "$ciphered_text" > "$filename"
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echo "Your text has been saved to $filename."
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read_dan_file() {
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echo "Enter the name of the .dan file to read without the extention"
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read read_filename
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read_filename="${read_filename}.dan"
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if [[ -f "$read_filename" ]]; then
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file_content=$(cat "$read_filename")
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deciphered_text=$(caesar_decipher "$file_content")
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echo "Deciphered content of $read_filename:"
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echo "$deciphered_text"
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else
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echo "File $read_filename does not exist."
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fi
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}
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echo "Would you like to read a .dan file? (y/n)"
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read read_choice
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if [[ "$read_choice" == "y" ]]; then
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read_dan_file
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fi
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