improved rotations, and adding drote (decode rote)
thanks to ai
This commit is contained in:
committer@tuxwarrior
+49
-119
@@ -245,111 +245,30 @@ function decimal_to_base36(){
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done && echo
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}
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# loops every 36, so that 36 becomes 1, etc
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decimal_to_base36_wrap() {
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local n=$(( $1 % 36 ))
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decimal_to_base36 $n
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}
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rot() {
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if [[ -n $1 ]] && [[ -n $2 ]] ; then
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if [[ $1 == "1" ]] ; then
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echo "$2" | tr 'a-z' 'b-za'
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elif [[ $1 == "-1" ]] ; then
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echo "$2" | tr 'b-za' 'a-z'
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elif [[ $1 == "2" ]] ; then
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echo "$2" | tr 'a-z' 'c-zab'
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elif [[ $1 == "-2" ]] ; then
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echo "$2" | tr 'c-zab' 'a-z'
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elif [[ $1 == "3" ]] ; then
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echo "$2" | tr 'a-z' 'd-zabc'
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elif [[ $1 == "-3" ]] ; then
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echo "$2" | tr 'd-zabc' 'a-z'
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elif [[ $1 == "4" ]] ; then
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echo "$2" | tr 'a-z' 'e-zabcd'
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elif [[ $1 == "-4" ]] ; then
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echo "$2" | tr 'e-zabcd' 'a-z'
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elif [[ $1 == "5" ]] ; then
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echo "$2" | tr 'a-z' 'f-zabcde'
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elif [[ $1 == "-5" ]] ; then
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echo "$2" | tr 'f-zabcde' 'a-z'
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elif [[ $1 == "6" ]] ; then
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echo "$2" | tr 'a-z' 'g-zabcdef'
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elif [[ $1 == "-6" ]] ; then
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echo "$2" | tr 'g-zabcdef' 'a-z'
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elif [[ $1 == "7" ]] ; then
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echo "$2" | tr 'a-z' 'h-zabcdefg'
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elif [[ $1 == "-7" ]] ; then
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echo "$2" | tr 'h-zabcdefg' 'a-z'
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elif [[ $1 == "8" ]] ; then
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echo "$2" | tr 'a-z' 'i-zabcdefgh'
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elif [[ $1 == "-8" ]] ; then
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echo "$2" | tr 'i-zabcdefgh' 'a-z'
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elif [[ $1 == "9" ]] ; then
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echo "$2" | tr 'a-z' 'j-zabcdefghi'
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elif [[ $1 == "-9" ]] ; then
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echo "$2" | tr 'j-zabcdefghi' 'a-z'
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elif [[ $1 == "10" ]] ; then
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echo "$2" | tr 'a-z' 'k-zabcdefghij'
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elif [[ $1 == "-10" ]] ; then
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echo "$2" | tr 'k-zabcdefghij' 'a-z'
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elif [[ $1 == "11" ]] ; then
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echo "$2" | tr 'a-z' 'l-zabcdefghijk'
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elif [[ $1 == "-11" ]] ; then
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echo "$2" | tr 'l-zabcdefghijk' 'a-z'
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elif [[ $1 == "12" ]] ; then
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echo "$2" | tr 'a-z' 'm-zabcdefghijkl'
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elif [[ $1 == "-12" ]] ; then
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echo "$2" | tr 'm-zabcdefghijkl' 'a-z'
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elif [[ $1 == "13" ]] ; then
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echo "$2" | tr 'a-z' 'n-zabcdefghijklm'
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elif [[ $1 == "-13" ]] ; then
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echo "$2" | tr 'n-zabcdefghijklm' 'a-z'
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elif [[ $1 == "14" ]] ; then
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echo "$2" | tr 'a-z' 'o-zabcdefghijklmn'
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elif [[ $1 == "-14" ]] ; then
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echo "$2" | tr 'o-zabcdefghijklmn' 'a-z'
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elif [[ $1 == "15" ]] ; then
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echo "$2" | tr 'a-z' 'p-zabcdefghijklmno'
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elif [[ $1 == "-15" ]] ; then
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echo "$2" | tr 'p-zabcdefghijklmno' 'a-z'
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elif [[ $1 == "16" ]] ; then
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echo "$2" | tr 'a-z' 'q-zabcdefghijklmnop'
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elif [[ $1 == "-16" ]] ; then
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echo "$2" | tr 'q-zabcdefghijklmnop' 'a-z'
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elif [[ $1 == "17" ]] ; then
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echo "$2" | tr 'a-z' 'r-zabcdefghijklmnopq'
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elif [[ $1 == "-17" ]] ; then
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echo "$2" | tr 'r-zabcdefghijklmnopq' 'a-z'
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elif [[ $1 == "18" ]] ; then
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echo "$2" | tr 'a-z' 's-zabcdefghijklmnopqr'
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elif [[ $1 == "-18" ]] ; then
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echo "$2" | tr 's-zabcdefghijklmnopqr' 'a-z'
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elif [[ $1 == "19" ]] ; then
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echo "$2" | tr 'a-z' 't-zabcdefghijklmnopqrs'
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elif [[ $1 == "-19" ]] ; then
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echo "$2" | tr 't-zabcdefghijklmnopqrs' 'a-z'
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elif [[ $1 == "20" ]] ; then
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echo "$2" | tr 'a-z' 'u-zabcdefghijklmnopqrst'
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elif [[ $1 == "-20" ]] ; then
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echo "$2" | tr 'u-zabcdefghijklmnopqrst' 'a-z'
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elif [[ $1 == "21" ]] ; then
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echo "$2" | tr 'a-z' 'v-zabcdefghijklmnopqrstu'
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elif [[ $1 == "-21" ]] ; then
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echo "$2" | tr 'v-zabcdefghijklmnopqrstu' 'a-z'
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elif [[ $1 == "22" ]] ; then
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echo "$2" | tr 'a-z' 'w-zabcdefghijklmnopqrstuv'
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elif [[ $1 == "-22" ]] ; then
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echo "$2" | tr 'w-zabcdefghijklmnopqrstuv' 'a-z'
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elif [[ $1 == "23" ]] ; then
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echo "$2" | tr 'a-z' 'x-zabcdefghijklmnopqrstuvw'
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elif [[ $1 == "-23" ]] ; then
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echo "$2" | tr 'x-zabcdefghijklmnopqrstuvw' 'a-z'
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elif [[ $1 == "24" ]] ; then
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echo "$2" | tr 'a-z' 'y-zabcdefghijklmnopqrstuvwx'
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elif [[ $1 == "-24" ]] ; then
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echo "$2" | tr 'y-zabcdefghijklmnopqrstuvwx' 'a-z'
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elif [[ $1 == "25" ]] ; then
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echo "$2" | tr 'a-z' 'z-zabcdefghijklmnopqrstuvwxy'
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elif [[ $1 == "-25" ]] ; then
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echo "$2" | tr 'z-zabcdefghijklmnopqrstuvwxy' 'a-z'
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local shift=$1
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local text=$2
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local alpha=abcdefghijklmnopqrstuvwxyz
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local n
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if [[ -z $shift || -z $text ]]; then
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echo "Usage: rot <shift> <text>"
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return 1
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fi
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fi
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# Normalize shift to 0-25
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n=$(( (shift % 26 + 26) % 26 ))
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# Generate rotated alphabet
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local rotated="${alpha:n}${alpha:0:n}"
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echo "$text" | tr "a-z" "$rotated"
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}
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rotl() {
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@@ -376,42 +295,53 @@ rotl() {
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}
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rote() {
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rote36 $1
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}
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rote10() {
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if [[ -n $1 ]] ; then
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datestamp=$(date +%y%m%d)_
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rotl=$(rotl $1 0)
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# ${param/pattern/replacement}
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rotl="${rotl/./}"
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emailaddress=$datestamp$rotl"@reduxmail.com"
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echo $emailaddress
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fi
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input="${1//./}"
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rote36 "$input"
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}
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rote36() {
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if [[ -n $1 ]] ; then
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# datestamp as base 36
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datestamp=$(date +%y%m%d)_
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year=$(decimal_to_base36 $(date +%y))
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year=$(decimal_to_base36_wrap $(date +%y))
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month=$(decimal_to_base36 $(date +%m))
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day=$(decimal_to_base36 $(date +%d))
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datestamp=${year}${month}${day}_
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datestamp=`echo "${datestamp}" | tr '[A-Z]' '[a-z]'`
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rotl=$(rotl $1 0)
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# ${param/pattern/replacement}
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rotl="${rotl/./}"
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emailaddress=$datestamp$rotl"@reduxmail.com"
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echo $emailaddress
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fi
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}
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drote() {
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local email="$1"
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# Extract base36 date and encoded string
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local base36date="${email%%_*}"
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local rest="${email#*_}"
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rest="${rest%@reduxmail.com}"
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# Decode base36 date
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local year36="${base36date:0:1}"
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local month36="${base36date:1:1}"
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local day36="${base36date:2:1}"
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local year=$(echo "ibase=36; ${year36^^}" | bc)
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local month=$(echo "ibase=36; ${month36^^}" | bc)
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local day=$(echo "ibase=36; ${day36^^}" | bc)
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# Decode the rest using rotl with shift 0 (reverse of rotl 0 is itself)
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# If you have a function to reverse the encoding, use it here.
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# For now, let's assume rotl 0 is a simple rot13 (as in your example)
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local decoded=$(echo "$rest" | tr 'a-z' 'n-za-m')
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printf "%02d%02d%02d: %s\n" "$year" "$month" "$day" "$decoded"
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}
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# ---
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# searching
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