本文介绍了密码和SQL的哈希系统中的特殊问题的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

大家好,



我使用哈希系统来存储密码。

这个问题很特殊,因为只有第一个才会发生userid的字母表(用于身份验证)很小'n'。



在sql中保存时,2个数字会被更改。 (编号(2)和(3))



以下是我在调试时恢复的相关哈希序列:

使用的案例是用户:neetu和密码:123456



Hi All,

I am using hash system for storing password.
The problem is peculiar because it only happens if the first alphabet of the userid (used for authentication) is small 'n'.

2 numbers gets changed while saving in sql. (no. (2) and (3))

Below are the related hash sequences i recovered while debugging:
the case used is user: neetu and password: 123456

Public Function fnHashedValue(ByVal value, ByVal authentication)
       'To Convert string into hash for storing and comparision
       Dim sSourceData As String = value + authentication

       'Create a byte array from source data.
       Dim tmpSource() As Byte = ASCIIEncoding.ASCII.GetBytes(sSourceData)

       'Compute hash based on source data.
       Dim tmpHash() As Byte = New SHA1CryptoServiceProvider().ComputeHash(tmpSource)

       Return tmpHash

   End Function







tmpNewHash      ? tmpSavedHash
{Length=20}     {Length=20}
    (0): 54         (0): 54
    (1): 236            (1): 236
    (2): 128            (2): 253
    (3): 223            (3): 255
    (4): 250            (4): 250
    (5): 49         (5): 49
    (6): 33         (6): 33
    (7): 163            (7): 163
    (8): 231            (8): 231
    (9): 207            (9): 207
    (10): 11            (10): 11
    (11): 187           (11): 187
    (12): 221           (12): 221
    (13): 23            (13): 23
    (14): 28            (14): 28
    (15): 193           (15): 193
    (16): 87            (16): 87
    (17): 10            (17): 10
    (18): 103           (18): 103
    (19): 1         (19): 1

推荐答案


Private Function ByteArrayToString(ByVal arrInput() As Byte) As String
       Dim i As Integer
       Dim sOutput As New StringBuilder(arrInput.Length)
       For i = 0 To arrInput.Length - 1
           sOutput.Append(arrInput(i).ToString("X2"))
       Next
       Return sOutput.ToString()
   End Function


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10-23 18:26