' Encrypt and decrypt functions for classic ASP (by TFI)
'********* set a random string with random length ***********
cryptkey = "GNQ?4i0-*\CldnU+[vrF1j1PcWeJfVv4QGBurFK6}*l[H1S:oY\v@U?i,oD]f/n8oFk6NesH--^PJeCLdp+(t8SVe:ewY(wR9p-CzG<,Q/(U*.pXDiz/KvnXP`BXnkgfeycb)1A4XKAa-2G}74Z8CqZ*A0P8E[S`6RfLwW+Pc}13U}_y0bfscJ<vkA[JC;0mEEuY4Q,([U*XRR}lYTE7A(O8KiF8>W/m1D*YoAlkBK@`3A)trZsO5xv@5@MRRFkt\"
'**************************** ENCRYPT FUNCTION ******************************
'*** Note: bytes 255 and 0 are converted into the same character, in order to
'*** avoid a char 0 which would terminate the string
function encrypt(inputstr)
Dim i,x
outputstr=""
cc=0
for i=1 to len(inputstr)
x=asc(mid(inputstr,i,1))
x=x-48
if x<0 then x=x+255
x=x+asc(mid(cryptkey,cc+1,1))
if x>255 then x=x-255
outputstr=outputstr&chr(x)
cc=(cc+1) mod len(cryptkey)
next
encrypt=server.urlencode(replace(outputstr,"%","%25"))
end function
'**************************** DECRYPT FUNCTION ******************************
function decrypt(byval inputstr)
Dim i,x
inputstr=urldecode(inputstr)
outputstr=""
cc=0
for i=1 to len(inputstr)
x=asc(mid(inputstr,i,1))
x=x-asc(mid(cryptkey,cc+1,1))
if x<0 then x=x+255
x=x+48
if x>255 then x=x-255
outputstr=outputstr&chr(x)
cc=(cc+1) mod len(cryptkey)
next
decrypt=outputstr
end function
'****************************************************************************
Function URLDecode(sConvert)
Dim aSplit
Dim sOutput
Dim I
If IsNull(sConvert) Then
URLDecode = ""
Exit Function
End If
'sOutput = REPLACE(sConvert, "+", " ") ' convert all pluses to spaces
sOutput=sConvert
aSplit = Split(sOutput, "%") ' next convert %hexdigits to the character
If IsArray(aSplit) Then
sOutput = aSplit(0)
For I = 0 to UBound(aSplit) - 1
sOutput = sOutput & Chr("&H" & Left(aSplit(i + 1), 2)) & Right(aSplit(i + 1), Len(aSplit(i + 1)) - 2)
Next
End If
URLDecode = sOutput
End Function
출처 : https://code-examples.net/ko/q/348e47
