vb6 求对二进制数组加密算法

[chenvb]

大家好,所用是vb6编码,求对二进制数组加密算法,大家有的发一份上来,谢谢.

[chenvb]

在客户端加密二进制数组,然后发送到服务器,再进行解密处理.

[贝隆]

关注

[chenvb]

[Quote=引用 4 楼 bdzwj 的回复:]
public function EnDeCode(bytes() as byte, byval strKey as string) as byte()
dim lKey as long
dim lCount as long
dim i as long
dim bytesOut() as byte

lKey = crc16(strKey) // 找一个CRC算法，把strKey转换成整型CRC值

rnd -1 * (abs(lkey)) // 产生一个负数的随机种子
lcount = ubound(bytes)

redim bytesOut(lcount)
for i = 0 to lcount
  bytesout(i) = bytes(i) xor ( (rnd() * 10000) mod &HFF)
next
EnDeCode = bytesOut
end function

第一次运行该函数为加密，第二次运行该函数为解密， 随手写的，没测试，原理应该没问题
[/Quote]

strKey有什么要求呢?每次指定一个字符串?

[chenvb]

bdzwj你帮偶写个crc16()吧,谢啦.

[SYSSZ]

最简单的---数组的每一元素用Not逐位取反(1变0,0变1),解密时再Not回来,但多用异\或运算.

[bdzwj]

unction CRC16(pBytes() As Byte, ByVal nSize As Long) As Long
Dim CRC16Lo As Byte, CRC16Hi As Byte 'CRC寄存器
Dim CL As Byte, CH As Byte '多项式码&HA001
Dim SaveHi As Byte, SaveLo As Byte
Dim i As Long
Dim Flag As Integer
CRC16Lo = &HFF
CRC16Hi = &HFF
CL = &H1
CH = &HA0
For i = nIndex To nSize
CRC16Lo = CRC16Lo Xor pBytes(i) '每一个数据与CRC寄存器进行异或
For Flag = 0 To 7
SaveHi = CRC16Hi
SaveLo = CRC16Lo
CRC16Hi = CRC16Hi \ 2 '高位右移一位
CRC16Lo = CRC16Lo \ 2 '低位右移一位
If ((SaveHi And &H1) = &H1) Then '如果高位字节最后一位为1
CRC16Lo = CRC16Lo Or &H80 '则低位字节右移后前面补1
End If '否则自动补0
If ((SaveLo And &H1) = &H1) Then '如果LSB为1，则与多项式码进行异或
CRC16Hi = CRC16Hi Xor CH
CRC16Lo = CRC16Lo Xor CL
End If
Next Flag

Next i

'
' 返回CRC
'
Dim ReturnData(1) As Byte
ReturnData(0) = CRC16Hi 'CRC高位
ReturnData(1) = CRC16Lo 'CRC低位
CopyMemory ByVal VarPtr(CRC16), ByVal VarPtr(ReturnData(0)), 2
End Function

'
' 获取CRC16
dim bytesCRC() as byte
bytesCRC = strconv(strKey, vbFromUnicode)
lkey = crc16(bytescrc, ubound(bytesCRC) + 1)

[bdzwj]

public function EnDeCode(bytes() as byte, byval strKey as string) as byte()
dim lKey as long
dim lCount as long
dim i as long
dim bytesOut() as byte

lKey = crc16(strKey) // 找一个CRC算法，把strKey转换成整型CRC值

rnd -1 * (abs(lkey)) // 产生一个负数的随机种子
lcount = ubound(bytes)

redim bytesOut(lcount)
for i = 0 to lcount
bytesout(i) = bytes(i) xor ( (rnd() * 10000) mod &HFF)
next
EnDeCode = bytesOut
end function

第一次运行该函数为加密，第二次运行该函数为解密， 随手写的，没测试，原理应该没问题

[TechnoFantasy]

数据传输中如果安全性要求比较高的话可以使用RSA加密。网上找找有这样的VB程序的。

[chenvb]

lkey = crc16(bytescrc, ubound(bytesCRC) + 1)
提示CRC16Lo = CRC16Lo Xor pBytes(i) 越界,
我把它修改成lkey = crc16(bytescrc, ubound(bytesCRC))就没报错了.呵呵.

[chenvb]

非常感谢大家支持,特别是bdzwj,以后多多关照啰.结贴了.