如何解密使用HMACSHA1加密的字符串？ [英] How to decrypt a string encrypted with HMACSHA1?

问题描述

我是一个加密新手，试图在系统之间来回传递一些值。我可以加密的值，但似乎无法弄清楚如何解密在另一端。我使用VB.NET创建了一个简单的Windows Forms应用程序。尝试输入一个值和一个密钥，加密然后解密以获得原始值。这是我的代码到目前为止。任何帮助非常感谢。谢谢。

 导入系统
导入System.IO 
导入System.Security.Cryptography 
 Imports System.Text 
 
公共类Form1 
 
 Private Sub btnEncode_Click（ByVal sender As System.Object，ByVal e As System.EventArgs）处理btnEncode.Click 
 Dim hmacsha1作为新的HMACSHA1（Encoding.ASCII.GetBytes（txtKey.Text））
 Dim hashValue As Byte（）= hmacsha1.ComputeHash（Encoding.ASCII.GetBytes（txtValue.Text））
 txtResult.Text = BytesToHexString（hashValue）
 hmacsha1.Clear（）
 End Sub 
 
 Private Sub btnDecode_Click（ByVal sender As System.Object，ByVal e As System.EventArgs）处理btnDecode.Click 
'??? 
 End Sub 
 
私有函数BytesToHexString（ByVal bytes As Byte（））As String 
 Dim输出As String = String.Empty 
 Dim i As Integer = 0 
尽管我< bytes.Length 
 output + = bytes（i）.ToString（X2）
i + = 1 
循环
返回输出
结束函数
结束类
  

解决方案

HMAC-SHA1是一种单向< href =http://en.wikipedia.org/wiki/Cryptographic_hash_function =noreferrer>哈希，而不是双向加密算法。你不能解密它。我没有时间在这里提供完整的加密代码 - 这是一个复杂的主题，但是Barry Dorrans的开始ASP.NET安全性将为您提供一个良好的起点。 （只有一些是ASP.NET特定的。）你也可以看他的 DDD talk 的话题。

I'm an encryption novice trying to pass some values back and forth between systems. I can encrypt the value, but can't seem to figure out how to decrypt on the other end. I've created a simple Windows Forms application using VB.NET. Trying to input a value and a key, encrypt and then decrypt to get the original value. Here's my code so far. Any help greatly appreciated. Thanks.

Imports System
Imports System.IO
Imports System.Security.Cryptography
Imports System.Text

Public Class Form1

    Private Sub btnEncode_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEncode.Click
        Dim hmacsha1 As New HMACSHA1(Encoding.ASCII.GetBytes(txtKey.Text))
        Dim hashValue As Byte() = hmacsha1.ComputeHash(Encoding.ASCII.GetBytes(txtValue.Text))
        txtResult.Text = BytesToHexString(hashValue)
        hmacsha1.Clear()
    End Sub

    Private Sub btnDecode_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDecode.Click
        '???
    End Sub

    Private Function BytesToHexString(ByVal bytes As Byte()) As String
        Dim output As String = String.Empty
        Dim i As Integer = 0
        Do While i < bytes.Length
            output += bytes(i).ToString("X2")
            i += 1
        Loop
        Return output
    End Function
End Class

解决方案

HMAC-SHA1 is a one-way hash, not a bidirectional encryption algorithm. You can't decrypt it. I don't have time to provide full encryption code here - it's a complicated topic, but Barry Dorrans' "Beginning ASP.NET Security" would give you a good starting point. (Only some of it is ASP.NET-specific.) You could also watch his DDD talk on the topic.

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