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ASP验证码的程序及原理

王朝asp·作者佚名  2006-11-24
窄屏简体版  字體: |||超大  

##### 版权所有 转载请保留 谢谢合作

##### 部分程序取自网络

##### 作者:扬子

##### Email: yangzinet@hotmail.com

##### QQ: 21112856

##### WebSite: www.tingfo.net

一共4个页面:form.asp; chk.asp; num.asp; count.asp

得到一个随即数字。加密!

解密后成成XBM图片

利用session 判断

form.asp

<%

'### To encrypt/decrypt include this code in your page

'### strMyEncryptedString = EncryptString(strString)

'### strMyDecryptedString = DeCryptString(strMyEncryptedString)

'### You are free to use this code as long as credits remain in place

'### also if you improve this code let me know.

Private Function EncryptString(strString)

'####################################################################

'### Crypt Function (C) 2001 by Slavic Kozyuk grindkore@yahoo.com ###

'### Arguments: strString <--- String you wish to encrypt ###

'### Output: Encrypted HEX string ###

'####################################################################

Dim CharHexSet, intStringLen, strTemp, strRAW, i, intKey, intOffSet

Randomize Timer

intKey = Round((RND * 1000000) + 1000000) '##### Key Bitsize

intOffSet = Round((RND * 1000000) + 1000000) '##### KeyOffSet Bitsize

If IsNull(strString) = False Then

strRAW = strString

intStringLen = Len(strRAW)

For i = 0 to intStringLen - 1

strTemp = Left(strRAW, 1)

strRAW = Right(strRAW, Len(strRAW) - 1)

CharHexSet = CharHexSet & Hex(Asc(strTemp) * intKey)& Hex(intKey)

Next

EncryptString = CharHexSet & "|" & Hex(intOffSet + intKey) & "|" & Hex(intOffSet)

Else

EncryptString = ""

End If

End Function

Private Function DeCryptString(strCryptString)

'####################################################################

'### Crypt Function (C) 2001 by Slavic Kozyuk grindkore@yahoo.com ###

'### Arguments: Encrypted HEX stringt ###

'### Output: Decrypted ASCII string ###

'####################################################################

'### Note this function uses HexConv() and get_hxno() functions ###

'### so make sure they are not removed ###

'####################################################################

Dim strRAW, arHexCharSet, i, intKey, intOffSet, strRawKey, strHexCrypData

strRawKey = Right(strCryptString, Len(strCryptString) - InStr(strCryptString, "|"))

intOffSet = Right(strRawKey, Len(strRawKey) - InStr(strRawKey,"|"))

intKey = HexConv(Left(strRawKey, InStr(strRawKey, "|") - 1)) - HexConv(intOffSet)

strHexCrypData = Left(strCryptString, Len(strCryptString) - (Len(strRawKey) + 1))

arHexCharSet = Split(strHexCrypData, Hex(intKey))

For i=0 to UBound(arHexCharSet)

strRAW = strRAW & Chr(HexConv(arHexCharSet(i))/intKey)

Next

DeCryptString = strRAW

End Function

Private Function HexConv(hexVar)

Dim hxx, hxx_var, multiply

IF hexVar <> "" THEN

hexVar = UCASE(hexVar)

hexVar = StrReverse(hexVar)

DIM hx()

REDIM hx(LEN(hexVar))

hxx = 0

hxx_var = 0

FOR hxx = 1 TO LEN(hexVar)

IF multiply = "" THEN multiply = 1

hx(hxx) = mid(hexVar,hxx,1)

hxx_var = (get_hxno(hx(hxx)) * multiply) + hxx_var

multiply = (multiply * 16)

NEXT

hexVar = hxx_var

HexConv = hexVar

END IF

End Function

Private Function get_hxno(ghx)

If ghx = "A" Then

ghx = 10

ElseIf ghx = "B" Then

ghx = 11

ElseIf ghx = "C" Then

ghx = 12

ElseIf ghx = "D" Then

ghx = 13

ElseIf ghx = "E" Then

ghx = 14

ElseIf ghx = "F" Then

ghx = 15

End If

get_hxno = ghx

End Function

%>

<%

randomize

num = int(7999*rnd+2000) '计数器的值

num2 = EncryptString(num)

session("pwdt")=num

%>

<form action="chk.asp" method=post>

请输入验证码: <input type="text" name="pwds">

<img src="count.asp?sksid=<%=num2%>"> <input type=submit value=提交>

</form>

chk.asp

<%

if trim(request.form("pwds"))<>trim(session("pwdt")) then

%>

输入错误: 应该为:<%=session("pwdt")%>,可你输入的是:<%=request.form("pwds")%>

<%

else

%>

输入正确

<%end if%>

count.asp

<!--#include file="num.asp"-->

<%

'### To encrypt/decrypt include this code in your page

'### strMyEncryptedString = EncryptString(strString)

'### strMyDecryptedString = DeCryptString(strMyEncryptedString)

'### You are free to use this code as long as credits remain in place

'### also if you improve this code let me know.

Private Function EncryptString(strString)

'####################################################################

'### Crypt Function (C) 2001 by Slavic Kozyuk grindkore@yahoo.com ###

'### Arguments: strString <--- String you wish to encrypt ###

'### Output: Encrypted HEX string ###

'####################################################################

Dim CharHexSet, intStringLen, strTemp, strRAW, i, intKey, intOffSet

Randomize Timer

intKey = Round((RND * 1000000) + 1000000) '##### Key Bitsize

intOffSet = Round((RND * 1000000) + 1000000) '##### KeyOffSet Bitsize

If IsNull(strString) = False Then

strRAW = strString

intStringLen = Len(strRAW)

For i = 0 to intStringLen - 1

strTemp = Left(strRAW, 1)

strRAW = Right(strRAW, Len(strRAW) - 1)

CharHexSet = CharHexSet & Hex(Asc(strTemp) * intKey)& Hex(intKey)

Next

EncryptString = CharHexSet & "|" & Hex(intOffSet + intKey) & "|" & Hex(intOffSet)

 

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