@Echo Off&Title Caesar Crypt - SmartGenius
Setlocal Enabledelayedexpansion

:Init
Set /p "Text=Enter Text >"
If Not Defined Text Goto :Init
Set /p "Rot=Enter Seed >"
If Not Defined Rot Goto :Init
If 26 LEQ %Rot% Goto :Init
Call :Crypt.A Text Rot
Echo.
Echo. Result: %Text%
Echo.
Pause
Exit

:Crypt.A
If not defined %1 Goto:Eof
Set "c="
Set "d=ABCDEFGHIJKLMNOPQRSTUVWXYZ"
:Crypt.B
Set "chr=!%1:~,1!"
For /l %%l in (0 1 26) do (
if "!chr!" equ " " (
Set "%1=!%1:~1!"
Set "c=!c! "
Goto :Crypt.B)
if "!chr!" equ "!d:~%%l,1!" (
  set /a "x=(~((%%l-26)*-1)+!%~2!)+1"
  call set "c=!c!%%d:~!x!,1%%"
))
Set "%1=!%1:~1!"
If defined %1 goto:Crypt.B
Set "%1=!c!"
Goto :Eof

:: CIFRADO CAESAR - BATCHIANO :)
@echo off
setlocal enabledelayedexpansion
set "CHARS= abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
:MAIN
cls
echo.
echo CIFRADO CAESAR - BATCHIANO :)
echo.
echo. 1. cifrar
echo. 2. descifrar
echo. 3. salir
echo.
set /p op=Opcion:
if not defined op (
	goto :main
) else (
	if !op!==1 (
		goto :cifrar
	) else if !op!==2 (
		goto :descifrar
	) else (
		exit/b
	)
)
:cifrar
cls
set /p desp=Desplazamiento lateral:
set /p texto=Texto a cifrar:
for %%? in (desp,texto) do if not defined %%? goto :cifrar
call :analizar "e" "!texto!" !desp!
echo -------------------
echo. Texto cifrado: !cad!
pause>nul
goto :eof

:descifrar
cls
echo El formato para descifrar es [desplazamiento]texto - Ejemplo: 2razqnq
set /p texto=Texto a descifrar:
if not defined texto goto :descifrar
call :analizar "d" "!texto!"
echo -------------------
echo. Texto descifrado: !cad!
pause>nul
goto :eof
	
:analizar
set t=%~2
set TYPE=%~1
if "!TYPE!"=="e" (
	set /a d=%3
	set cad=!d!
	set /a i=0
) else (
	set /a i=1
	set "cad="
	set shift=!t:~0,1!
)
::while
:while
	if "!t:~%i%,1!" NEQ "" (
		call :find_char "!t:~%i%,1!" "!CHARS!"
		call :class !return!
		if "!TYPE!"=="e" (
			set /a rd=!return!+!d!
		) else (
			set /a rd=!return!-!shift!
		)
		if "!CLASS!"=="NONE" (
			set "cad=!cad!!t:~%i%,1!"
		) else (
			if "!CLASS!"=="SPACE" (
				set "cad=!cad! "
			) else (
				if "!TYPE!"=="e" (
					call :resize_enc !rd!
				) else (
					call :resize_dec !rd!
				)
				call :select_char "!CHARS!" !rd!
				set "cad=!cad!!sc!"
			)
		)
		set /a i+=1
	goto :while)
goto :eof

	
:find_char
set C=%~1
set L=%~2
set /a pos=0
	:loop
	if "!C!" NEQ "!L:~%pos%,1!" (
		set /a pos+=1
		if !pos! LSS 64 (goto :loop)
	)
set /a return=%pos%
goto :eof


:select_char
set lc=%~1
set key=%2
set sc=!lc:~%key%,1!
goto :eof


:class
if %1 == 0 (
	set CLASS=SPACE
) else if %1 GTR 0 (
	if %1 LSS 27 (
		set CLASS=MIN
	) else if %1 LSS 53 (
		set CLASS=MAY
	) else if %1 LSS 63 (
		set CLASS=NUM
	) else (
		set CLASS=NONE
	)
)
goto :eof


:resize_enc
if "!CLASS!"=="MIN" (
	if !rd! gtr 26 (
		set /a rd-=26
	)
)
if "!CLASS!"=="MAY" (
	if !rd! gtr 52 (
		set /a rd-=26
	)
)
if "!CLASS!"=="NUM" (
	if !rd! gtr 62 (
		set /a rd-=10
	)
)
goto :eof

:resize_dec
if "!CLASS!"=="MIN" (
	if !rd! lss 1 (
		set /a rd+=26
	)
)
if "!CLASS!"=="MAY" (
	if !rd! lss 26 (
		set /a rd+=26
	)
)
if "!CLASS!"=="NUM" (
	if !rd! lss	52 (
		set /a rd+=10
	)
)
goto :eof