Function UserCode(password As String) As String
'用户口令加密
Dim il_bit, il_x, il_y, il_z, il_len, i As Long
Dim is_out As String
il_len = Len(password)
il_x = 0
il_y = 0
is_out = ""
For i = 1 To il_len
il_bit = AscW(Mid(password, i, 1)) 'W系列支持unicode
il_y = (il_bit * 13 Mod 256) + il_x
is_out = is_out & ChrW(Fix(il_y)) '取整 int和fix区别: fix修正负数
il_x = il_bit * 13 / 256
Next
is_out = is_out & ChrW(Fix(il_x))
password = is_out
il_len = Len(password)
il_x = 0
il_y = 0
is_out = ""
For i = 1 To il_len
il_bit = AscW(Mid(password, i, 1))
'取前4位值
il_y = il_bit / 16 + 64
is_out = is_out & ChrW(Fix(il_y))
'取后4位值
il_y = (il_bit Mod 16) + 64
is_out = is_out & ChrW(Fix(il_y))
Next
UserCode = is_out
End Function
Function UserDeCode(password As String) As String
'口令解密
Dim is_out As String
Dim il_x, il_y, il_len, i, il_bit As Long
il_len = Len(password)
il_x = 0
il_y = 0
is_out = ""
For i = 1 To il_len Step 2
il_bit = AscW(Mid(password, i, 1))
'取前4位值
il_y = (il_bit - 64) * 16
'取后4位值
'dd = AscW(Mid(password, i + 1, 1)) - 64
il_y = il_y + AscW(Mid(password, i + 1, 1)) - 64
is_out = is_out & ChrW(il_y)
Next
il_x = 0
il_y = 0
password = is_out
is_out = ""
il_len = Len(password)
il_x = AscW(Mid(password, il_len, 1))
For i = (il_len - 1) To 1 Step -1
il_y = il_x * 256 + AscW(Mid(password, i, 1))
il_x = il_y Mod 13
is_out = ChrW(Fix(il_y / 13)) & is_out
Next
UserDeCode = is_out
End Function 
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