核心代碼：

<%  ' OPTION EXPLICIT   const BASE_64_MAP_INIT = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"   dim newline   dim Base64EncMap(63)   dim Base64DecMap(127)   '初始化函數   PUBLIC SUB initCodecs()     ' 初始化變量     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加密函數   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解密函數   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%>