checkcode.asp

使用本程序在局域网内聊天

<%
Dim a(10,10)

a(0,1) = "0x3c" '数字0
a(0,2) = "0x66"
a(0,3) = "0xc3"
a(0,4) = "0xc3"
a(0,5) = "0xc3"
a(0,6) = "0xc3"
a(0,7) = "0xc3"
a(0,8) = "0xc3"
a(0,9) = "0x66"
a(0,10)= "0x3c"

a(1,1) = "0x18"    '数字1
a(1,2) = "0x1c"
a(1,3) = "0x18"
a(1,4) = "0x18"
a(1,5) = "0x18"
a(1,6) = "0x18"
a(1,7) = "0x18"
a(1,8) = "0x18"
a(1,9) = "0x18"
a(0,10)= "0x7e"


a(2,1) = "0x3c" '数字2
a(2,2) = "0x66"
a(2,3) = "0x60"
a(2,4) = "0x60"
a(2,5) = "0x30"
a(2,6) = "0x18"
a(2,7) = "0x0c"
a(2,8) = "0x06"
a(2,9) = "0x06"
a(2,10)= "0x7e"

a(3,1) = "0x3c" '数字3
a(3,2) = "0x66"
a(3,3) = "0xc0"
a(3,4) = "0x60"
a(3,5) = "0x1c"
a(3,6) = "0x60"
a(3,7) = "0xc0"
a(3,8) = "0xc0"
a(3,9) = "0x66"
a(3,10)= "0x38"

a(4,1) = "0x38" '数字4
a(4,2) = "0x3c"
a(4,3) = "0x36"
a(4,4) = "0x33"
a(4,5) = "0x33"
a(4,6) = "0x33"
a(4,7) = "0xff"
a(4,8) = "0x30"
a(4,9) = "0x30"
a(4,10)= "0xfe"

a(5,1) = "0xfe" '数字5
a(5,2) = "0xfe"
a(5,3) = "0x06"
a(5,4) = "0x06"
a(5,5) = "0x3e"
a(5,6) = "0x60"
a(5,7) = "0xc0"
a(5,8) = "0xc3"
a(5,9) = "0x66"
a(5,10)= "0x3c"

a(6,1) = "0x60" '数字6
a(6,2) = "0x30"
a(6,3) = "0x18"
a(6,4) = "0x0c"
a(6,5) = "0x3e"
a(6,6) = "0x63"
a(6,7) = "0xc3"
a(6,8) = "0xc3"
a(6,9) = "0x66"
a(6,10) ="0x3c"

a(7,1) = "0xff" '数字7
a(7,2) = "0xc0"
a(7,3) = "0x60"
a(7,4) = "0x30"
a(7,5) = "0x18"
a(7,6) = "0x18"
a(7,7) = "0x18"
a(7,8) = "0x18"
a(7,9) = "0x18"
a(7,10)= "0x18"

a(8,1) = "0x3c" '数字8
a(8,2) = "0x66"
a(8,3) = "0xc3"
a(8,4) = "0x66"
a(8,5) = "0x3c"
a(8,6) = "0x66"
a(8,7) = "0xc3"
a(8,8) = "0xc3"
a(8,9) = "0x66"
a(8,10)= "0x3c"

a(9,1) = "0x3c" '数字9
a(9,2) = "0x66"
a(9,3) = "0xc3"
a(9,4) = "0xc3"
a(9,5) = "0x66"
a(9,6) = "0x3c"
a(9,7) = "0x18"
a(9,8) = "0x0c"
a(9,9) = "0x06"
a(9,10)= "0x03"

'### 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)
         
    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)
         
    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
     
     
'得到随机数
randomize
num = Round(8999*rnd+1000) '计数器的值
num2 = EncryptString(num)
session("CheckCode")=num

'将数字变为图像
Dim Image
Dim Width, Height
Dim num
Dim digtal
Dim Length
Dim sort
Length = 4 '自定计数器长度

Redim sort(Length)

num=cint(DeCryptString(num2))
digital = ""
For I = 1 To Length -Len( num ) '补0
    digital = digital & "0"
Next
For I = 1 To Len( num )
    digital = digital & Mid( num, I, 1 )
Next
For I = 1 To Len( digital )
    sort(I) = Mid( digital, I, 1 )
Next
Width = 8 * Len( digital )   '图像的宽度
Height = 10  '图像的高度，在本例中为固定值


'Response.ContentType="image/x-xbitmap"
hc=chr(13) & chr(10) 

Image = "#define counter_width " & Width & hc
Image = Image & "#define counter_height " & Height & hc
Image = Image & "static unsigned char counter_bits[]={" & hc

For I = 1 To Height
    For J = 1 To Length
        Image = Image & a(sort(J),I) & ","
    Next
Next

Image = Left( Image, Len( Image ) - 1 ) '去掉最后一个逗号
Image = Image & "};" & hc

Response.Write Image

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