@echo off
title 纯文本加解密工具1.0(加密)
rem 退格符
rem 标记感叹号
set exc=!
rem 标记引号
set quo="
rem 标记caret号
set car=^^
setlocal ENABLEDELAYEDEXPANSION
rem 标记大写字母
set CAP=ABCDEFGHIJKLMNOPQRSTUVWXYZ
for /l %%n in (0,1,25) do (set CAP_!CAP:~%%n,1!=!CAP:~%%n,1!)

echo 纯文本加解密工具1.0(加密) BY 0000
:setfile
set /p file=文件名称:
if "!file!"=="" (echo 无效的文件名&goto setfile)
set file=!file:"=!
if "!file!"=="" (echo 无效的文件名&goto setfile)
echo "!file!"|findstr /R /C:"[*?]">nul&&(echo 无效的文件名&goto setfile)
set file_1=!file:~-1!
if "!file_1!"=="/" (echo 无效的文件名&goto setfile)
if "!file_1!"=="\" (echo 无效的文件名&goto setfile)
dir /a-d "!file!">nul 2>nul||(echo 无效的文件名&goto setfile)
dir /a-d "!file!\">nul 2>nul&&(echo 无效的文件名&goto setfile)
:setpswd
call :inputpswd 6 *
rem 获取密码内容
set /a pswd_a=1%pswd:~0,3%-900
set /a pswd_b=1%pswd:~3,3%-900

call :getfile2

set /p =分析中. . .   *****/*****( 0%%)<nul
call :getline "!file!"

set ln_n=0
for /f "usebackq tokens=* eol= delims=" %%L in ($tmp$.txt) do (
  set /a ln_n=!ln_n!+1
  set ln_!ln_n!=%%L
)
del $tmp$.txt
rem 去引号
for /l %%n in (1,1,%ln_n%) do (
  set "ln_%%n=!ln_%%n:~1,-1!"
  set "ln_%%n=!ln_%%n:""="!"
)


set _n=1
set ln=!ln_1!
set chars=
set chars_n=0

:getchars
if %_n% gtr %ln_n% goto getc0
if "!ln!"=="" goto getc1
set lna=!ln:~0,1!
set ln=!ln:~1!
rem 先考虑引号，感叹号，等号和冒号
if "!lna!" == "!quo!" (
  rem 判断字母是否存在
  if not "!char_qu!"=="-1" (
    set chars=!chars!!quo!
    set /a chars_n=!chars_n!+1
    rem 字母已存在标志
    set char_qu=-1
  )
  goto getchars
)
if "!lna!"=="!exc!" (
  if not "!char_ex!"=="-1" (
    set chars=!chars!!exc!
    set /a chars_n=!chars_n!+1
    set char_ex=-1
  )
  goto getchars
)
if "!lna!"=="=" (
  if not "!char_eq!"=="-1" (
    set chars=!chars!=
    set /a chars_n=!chars_n!+1
    set char_eq=-1
  )
  goto getchars
)
if "!lna!"==":" (
  if not "!char_as!"=="-1" (
    set chars=!chars!:
    set /a chars_n=!chars_n!+1
    set char_as=-1
  )
  goto getchars
)
rem 大写字母判断
if "!CAP_%lna%!"=="%lna%" (
  if not "!charCAP_%lna%!"=="-1" (
    set chars=!chars!!lna!
    set /a chars_n=!chars_n!+1
    set charCAP_!lna!=-1
  )
) else (
  if not "!char_%lna%!"=="-1" (
    set chars=!chars!!lna!
    set /a chars_n=!chars_n!+1
    set char_!lna!=-1
  )
)
goto getchars

:getc1
set sh1=    %_n%
set sh2=    %ln_n%
set /a sh3=%_n%*100/%ln_n%
set sh3= %sh3%
set /p =分析中. . .   %sh1:~-5%/%sh2:~-5%(%sh3:~-2%%%)<nul
set /a _n=%_n%+1
set ln=!ln_%_n%!
goto getchars

:getc0


set /p =正在加密. . .     0/%sh2:~-5%( 0%%)<nul
set _n=%chars_n%

rem 打乱字符表
:randchars
if %_n% lss 0 goto ran0
set /a k=%random%*%_n%/32768
set /a k1=%k%+1
set chars=!chars:~0,%k%!!chars:~%k1%!!chars:~%k%,1!
set /a _n=%_n%-1
goto randchars
:ran0


set _n=%chars_n%
rem 标记字符位置
:setcharnum
set /a _n=%_n%-1
if %_n% lss 0 goto setcn0
set _c=!chars:~%_n%,1!
rem 先考虑引号，感叹号，等号和冒号
if "!_c!" == "!quo!" (
  set char_qu=!_n!
  goto setcharnum
)
if "!_c!"=="!exc!" (
  set char_ex=!_n!
  goto setcharnum
)
if "!_c!"=="=" (
  set char_eq=!_n!
  goto setcharnum
)
if "!_c!"==":" (
  set char_as=!_n!
  goto setcharnum
)
rem 大写字母判断
if "!CAP_%_c%!"=="%_c%" (
  set charCAP_!_c!=!_n!
) else (
  set char_!_c!=!_n!
)
goto setcharnum
:setcn0

rem 随机产生字符平移参数
set /a move_max=%chars_n%/2
if %move_max% gtr 30 set move_max=30 
:setmove
set /a move_a=%move_max%*%random%/32767+1
set /a move_b=%move_max%*%random%/32767+1
if %random% lss 16384 set /a move_a=-%move_a%
if %random% lss 16384 set /a move_b=-%move_b%
rem 通过复数运算得到密码数[ (字符平移参数a + 字符平移参数b * i) * ((密码前三位 + 100) + (密码后三位 + 100) * i) = 密码数]
call :complex %move_a% %move_b% * %pswd_a% %pswd_b% seed_a seed_b
call :complex %seed_a% %seed_b% / %pswd_a% %pswd_b% a b
rem 检查运算是否正确
if not "%a%"=="%move_a%" goto setmove
if not "%b%"=="%move_b%" goto setmove
rem 检查字符平移参数是否互质(保证密码唯一性)
if %a% lss 0 set /a a=-%a%
if %b% lss 0 set /a b=-%b%
:setm1
if %a% gtr %b% (set /a a=%a% %% %b%) else (set /a b=%b% %% %a%)
set /a ab=%a%*%b%
if "%ab%"=="0" (
  set /a a_b=%a%+%b%
  if not "!a_b!"=="1" goto setmove
) else (
  goto setm1
)


set _n=1
set ln=!ln_1!
set enc=
set enc_n=0
set /a move=-%move_a%
(
  echo TXT_ENCRIPT_1.0 BY 0000
  echo %seed_a%_%seed_b%
  echo;!chars!
)>"!file2!"

:encriptline
if %_n% gtr %ln_n% goto enc0
if "!ln!"=="" goto enc1
set lna=!ln:~0,1!
set ln=!ln:~1!
rem 先考虑引号，感叹号，等号和冒号
if "!lna!"=="!quo!" (call :setenc "!char_qu!"&goto encriptline)
if "!lna!"=="!exc!" (call :setenc "!char_ex!"&goto encriptline)
if "!lna!"=="=" (call :setenc "!char_eq!"&goto encriptline)
if "!lna!"==":" (call :setenc "!char_as!"&goto encriptline)
rem 大写字母判断
if "!CAP_%lna%!"=="%lna%" (call :setenc "!charCAP_%lna%!") else (call :setenc "!char_%lna%!")
goto encriptline
:enc1
call :setenc "-1"
set sh1=    %_n%
set sh2=    %ln_n%
set /a sh3=%_n%*100/ln_n
set sh3= %sh3%
set /p =正在加密. . . %sh1:~-5%/%sh2:~-5%(%sh3:~-2%%%)<nul
set /a _n=%_n%+1
set ln=!ln_%_n%!
goto encriptline

:enc0
echo;%enc%>>"!file2!"
echo 加密成功！                                      
echo 已保存到 !file2! !exc!                                        
echo ay|choice>nul
pause
goto end

rem Functions

:getline
rem 禁止延迟变量
setlocal DISABLEDELAYEDEXPANSION
(
  for /f "usebackq tokens=* eol= delims=" %%L in (%1) do (
    set _L=%%L
    rem 加引号
    call set _L="%%_L:"=""%%"
    call set _L=%%_L:!=!exc!%%
    call :getecho
  )
)>$tmp$.txt
goto end

:getecho
echo;%_L:^=!car!%
goto end

:setenc
set m=%1
set m=!m:~1,-1!
if "!m!"=="-1" goto sete1
set /a m=%m%+%move%
if %m% lss 0 set /a m=%m%+%chars_n%
if %m% geq %chars_n% set /a m=%m%-%chars_n%
:sete1
set enc=!enc!%m%_
set /a enc_n=%enc_n%+1
if "%enc_n%"=="8" (
  echo;!enc!>>"!file2!"
  set enc=
  set enc_n=0
  set /a move=!move!-!move_b!
  if !move! lss 0 set /a move=!move!+!chars_n!
  if !move! gtr !chars_n! set /a move=!move!-!chars_n!
)
goto end

:complex
rem complex a实 a虚 符号 b实 b虚 实变量名 虚变量名
if "%3"=="*" (
  set /a comp_x=%1*%4-%2*%5
  set /a comp_y=%1*%5+%2*%4
  set /a comp_k=1
)
if "%3"=="/" (
  set /a comp_x=%2*%5+%1*%4
  set /a comp_y=%2*%4-%1*%5
  set /a comp_k=%4*%4+%5*%5
)
set /a %6=%comp_x%/%comp_k%
set /a %7=%comp_y%/%comp_k%
goto end

:inputpswd
set pswd=
set pswdkey=
set pswdblank=
set pswdstar=
set /a pswdn1=%1-1
set /p =密码(6位数字):<nul
for /l %%n in (1,1,%1) do (set pswdblank= !pswdblank!)
:inp1
if not "%pswd%"=="" if not "!pswd:~%pswdn1%,1!"=="" (
  echo;
  goto end
)
for /f "tokens=*" %%f in ('xcopy /w . . 2^>nul') do (
  set pswdkey=%%f
  goto inp2
)
:inp2
set pswdkey=!pswdkey:~-1!
if "!pswdkey!"=="" (
  if not "!pswd!"=="" (
    set pswd=!pswd:~0,-1!
    set pswdstar=!pswdstar:~1,-1!
  )
)
for /l %%n in (0,1,9) do (
  if "!pswdkey!"=="%%n" (
    set pswd=!pswd!!pswdkey!
    set pswdstar=%2!pswdstar!
  )
)
set /p =密码(6位数字):!pswdblank!!pswdstar!<nul
goto inp1

:getfile2
setlocal DISABLEDELAYEDEXPANSION
for %%F in ("%file%") do (set "file2=%%~dpnF_Encript%%~xF")
set "file2=%file2:!=!exc!%"
endlocal&set "file2=%file2%"
goto :end

:end
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@echo off
title 纯文本加解密工具1.0(解密)
rem 退格符
setlocal ENABLEDELAYEDEXPANSION

echo 纯文本加解密工具1.0(解密) BY 0000
:setfile
set /p file=文件名称:
if "!file!"=="" (echo 无效的文件名&goto setfile)
set file=!file:"=!
if "!file!"=="" (echo 无效的文件名&goto setfile)
echo "!file!"|findstr /R /C:"[*?]">nul&&(echo 无效的文件名&goto setfile)
set file_1=!file:~-1!
if "!file_1!"=="/" (echo 无效的文件名&goto setfile)
if "!file_1!"=="\" (echo 无效的文件名&goto setfile)
dir /a-d "!file!">nul 2>nul||(echo 无效的文件名&goto setfile)
dir /a-d "!file!\">nul 2>nul&&(echo 无效的文件名&goto setfile)
for /f "usebackq tokens=* delims=" %%t in ("!file!") do (
  if not "%%t"=="TXT_ENCRIPT_1.0 BY 0000" (
    echo 该文件未被加密
    goto setfile
  ) else (
    rem 直接跳出for循环
    goto setpswd
  )
)
:setpswd
call :inputpswd 6 *
rem 获取密码内容
set /a pswd_a=1%pswd:~0,3%-900
set /a pswd_b=1%pswd:~3,3%-900

call :getfile2

for /f "usebackq skip=1 tokens=1,2 delims=_" %%a in ("!file!") do (
  set seed_a=%%a
  set seed_b=%%b
  goto setmove
)
:setmove
rem 通过复数运算得到字符平移参数[ (密码数a + 密码数b * i) * ((密码前三位 + 100) + (密码后三位 + 100) * i) = 字符平移参数]
call :complex %seed_a% %seed_b% / %pswd_a% %pswd_b% move_a move_b
call :complex %move_a% %move_b% * %pswd_a% %pswd_b% a b
rem 检查运算是否正确
if not "%a%"=="%seed_a%" (echo 密码不正确&goto setpswd)
if not "%b%"=="%seed_b%" (echo 密码不正确&goto setpswd)

rem 检查字符平移参数是否互质
set a=%move_a%
set b=%move_b%
if %a% lss 0 set /a a=-%a%
if %b% lss 0 set /a b=-%b%
:setm1
if %a% gtr %b% (set /a a=%a% %% %b%) else (set /a b=%b% %% %a%)
set /a ab=%a%*%b%
if "%ab%"=="0" (
  set /a a_b=%a%+%b%
  if not "!a_b!"=="1" (echo 密码不正确&goto setpswd)
) else (
  goto setm1
)

set /p =正在解密. . . *****/*****( 0%%)<nul
copy nul "!file2!" >nul
call :getchar
set /p chars=<$tmp$.txt
del $tmp$.txt
set _n=0
set ln_n=0
for /f "usebackq skip=3 delims= eol=" %%a in ("!file!") do (set /a ln_n=!ln_n!+1)
set dec=
set chars=!chars:~%move_a%!!chars:~0,%move_a%!
for /f "usebackq skip=3 tokens=1,2,3,4,5,6,7,8 delims=_" %%a in ("!file!") do (
  call :setdec %%a
  call :setdec %%b
  call :setdec %%c
  call :setdec %%d
  call :setdec %%e
  call :setdec %%f
  call :setdec %%g
  call :setdec %%h
  set sh1=    !_n!
  set sh2=    !ln_n!
  set /a sh3=!_n!*100/!ln_n!
  set sh3= !sh3!
  set /p =正在解密. . . !sh1:~-5!/!sh2:~-5!(!sh3:~-2!%%^)<nul
  set /a _n=!_n!+1
  set chars=!chars:~%move_b%!!chars:~0,%move_b%!
)
echo;!dec!>>"!file2!"
echo 解密成功！                                       
echo 已保存到 !file2! ^^!
echo ay|choice>nul
start notepad "!file2!"
pause
goto end


rem Functions


:setdec
if "%1"=="" goto end
if "%1"=="-1" goto setd1
set dec=!dec!!!chars:~%1,1!
goto end
:setd1
echo;!dec!>>"!file2!"
set dec=
goto end

:getchar
rem 禁止延迟变量
setlocal DISABLEDELAYEDEXPANSION
for /f "usebackq skip=2 tokens=* delims= eol=" %%t in ("%file%") do (
  echo;%%t>$tmp$.txt
  goto end
)
goto end

:complex
rem complex a实 a虚 符号 b实 b虚 实变量名 虚变量名
if "%3"=="*" (
  set /a comp_x=%1*%4-%2*%5
  set /a comp_y=%1*%5+%2*%4
  set /a comp_k=1
)
if "%3"=="/" (
  set /a comp_x=%2*%5+%1*%4
  set /a comp_y=%2*%4-%1*%5
  set /a comp_k=%4*%4+%5*%5
)
set /a %6=%comp_x%/%comp_k%
set /a %7=%comp_y%/%comp_k%
goto end

:inputpswd
set pswd=
set pswdkey=
set pswdblank=
set pswdstar=
set /a pswdn1=%1-1
set /p =密码(6位数字):<nul
for /l %%n in (1,1,%1) do (set pswdblank= !pswdblank!)
:inp1
if not "%pswd%"=="" if not "!pswd:~%pswdn1%,1!"=="" (
  echo;
  goto end
)
for /f "tokens=*" %%f in ('xcopy /w . . 2^>nul') do (
  set pswdkey=%%f
  goto inp2
)
:inp2
set pswdkey=!pswdkey:~-1!
if "!pswdkey!"=="" (
  if not "!pswd!"=="" (
    set pswd=!pswd:~0,-1!
    set pswdstar=!pswdstar:~1,-1!
  )
)
for /l %%n in (0,1,9) do (
  if "!pswdkey!"=="%%n" (
    set pswd=!pswd!!pswdkey!
    set pswdstar=%2!pswdstar!
  )
)
set /p =密码(6位数字):!pswdblank!!pswdstar!<nul
goto inp1

:getfile2
setlocal DISABLEDELAYEDEXPANSION
for %%F in ("%file%") do (set "file2=%%~dpnF_Decript%%~xF")
set "file2=%file2:!=!exc!%"
endlocal&set "file2=%file2%"
goto :end

:end
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goto :end
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echo,变量file2的值为："%file2%"&pause
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