ASP BASE64加解密(亲测可用)


            核心代码：





<%

  ' OPTION EXPLICIT

   const BASE_64_MAP_INIT = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"

   dim newline

   dim Base64EncMap(63)

   dim Base64DecMap(127)

   '初始化函数

   PUBLIC SUB initCodecs()

     ' 初始化变量

     newline = "<P>" & chr(13) & chr(10)

     dim max, idx

       max = len(BASE_64_MAP_INIT)

     for idx = 0 to max - 1

        Base64EncMap(idx) = mid(BASE_64_MAP_INIT, idx + 1, 1)

     next

     for idx = 0 to max - 1

        Base64DecMap(ASC(Base64EncMap(idx))) = idx

     next

   END SUB

   'Base64加密函数

   PUBLIC FUNCTION base64Encode(plain)

     if len(plain) = 0 then

        base64Encode = ""

        exit function

     end if

     dim ret, ndx, by3, first, second, third

     by3 = (len(plain) \ 3) * 3

     ndx = 1

     do while ndx <= by3

        first = asc(mid(plain, ndx+0, 1))

        second = asc(mid(plain, ndx+1, 1))

        third = asc(mid(plain, ndx+2, 1))

        ret = ret & Base64EncMap( (first \ 4) AND 63 )

        ret = ret & Base64EncMap( ((first * 16) AND 48) + ((second \ 16) AND 15 ) )

        ret = ret & Base64EncMap( ((second * 4) AND 60) + ((third \ 64) AND 3 ) )

        ret = ret & Base64EncMap( third AND 63)

        ndx = ndx + 3

     loop

     if by3 < len(plain) then

        first = asc(mid(plain, ndx+0, 1))

        ret = ret & Base64EncMap( (first \ 4) AND 63 )

        if (len(plain) MOD 3 ) = 2 then

          second = asc(mid(plain, ndx+1, 1))

          ret = ret & Base64EncMap( ((first * 16) AND 48) + ((second \ 16) AND 15 ) )

          ret = ret & Base64EncMap( ((second * 4) AND 60) )

        else

          ret = ret & Base64EncMap( (first * 16) AND 48)

          ret = ret '& "="

        end if

        ret = ret '& "="

     end if

     base64Encode = ret

   END FUNCTION

   'Base64解密函数

   PUBLIC FUNCTION base64Decode(scrambled)

     if len(scrambled) = 0 then

        base64Decode = ""

        exit function

     end if

     dim realLen

     realLen = len(scrambled)

     do while mid(scrambled, realLen, 1) = "="

        realLen = realLen - 1

     loop

     dim ret, ndx, by4, first, second, third, fourth

     ret = ""

     by4 = (realLen \ 4) * 4

     ndx = 1

     do while ndx <= by4

        first = Base64DecMap(asc(mid(scrambled, ndx+0, 1)))

        second = Base64DecMap(asc(mid(scrambled, ndx+1, 1)))

        third = Base64DecMap(asc(mid(scrambled, ndx+2, 1)))

        fourth = Base64DecMap(asc(mid(scrambled, ndx+3, 1)))

        ret = ret & chr( ((first * 4) AND 255) +  ((second \ 16) AND 3))

        ret = ret & chr( ((second * 16) AND 255) + ((third \ 4) AND 15))

        ret = ret & chr( ((third * 64) AND 255) + (fourth AND 63))

        ndx = ndx + 4

     loop

     if ndx < realLen then

        first = Base64DecMap(asc(mid(scrambled, ndx+0, 1)))

        second = Base64DecMap(asc(mid(scrambled, ndx+1, 1)))

        ret = ret & chr( ((first * 4) AND 255) +  ((second \ 16) AND 3))

        if realLen MOD 4 = 3 then

          third = Base64DecMap(asc(mid(scrambled,ndx+2,1)))

          ret = ret & chr( ((second * 16) AND 255) + ((third \ 4) AND 15))

        end if

     end if

     base64Decode = ret

   END FUNCTION



%>



使用方法：





' 初始化

 call initCodecs

Response.Write(base64Encode("中文源码网之我要加密的字符串"))

Response.Write(base64Decode("bWFyczIwMTAwMjIw0"))