python - 将 Simple3Des(VB.net) 加密-解密代码转换为 python

Question

我有一个纯 JSON 文本，它在 Visual Basic 中使用 Triple-DES 加密（下面提供的代码），现在我正在尝试使用 python 语言对其进行解密。当我测试它时，我得到了错误的输出。我认为有任何填充问题，因为我没有得到这一行：

ReDim Preserve hash(length - 1)

VB代码：

Public NotInheritable Class Simple3Des
    Private TripleDes As New TripleDESCryptoServiceProvider

    Private Function TruncateHash(ByVal key As String, ByVal length As Integer) As Byte()
        Dim sha1 As New SHA1CryptoServiceProvider

        ' Hash the key.
        Dim keyBytes() As Byte = System.Text.Encoding.Unicode.GetBytes(key)
        Dim hash() As Byte = sha1.ComputeHash(keyBytes)

        ' Truncate or pad the hash.
        ReDim Preserve hash(length - 1)

        Return hash
    End Function

    Sub New(ByVal key As String)
        ' Initialize the crypto provider.
        TripleDes.Key = TruncateHash(key, TripleDes.KeySize \ 8)
        TripleDes.IV = TruncateHash("", TripleDes.BlockSize \ 8)
    End Sub

    Public Function EncryptData(ByVal plaintext As String) As String
        ' Convert the plaintext string to a byte array.
        Dim plaintextBytes() As Byte = System.Text.Encoding.Unicode.GetBytes(plaintext)

        ' Create the stream.
        Dim ms As New System.IO.MemoryStream

        ' Create the encoder to write to the stream.
        Dim encStream As New CryptoStream(ms,
            TripleDes.CreateEncryptor(),
            System.Security.Cryptography.CryptoStreamMode.Write)

        ' Use the crypto stream to write the byte array to the stream.
        encStream.Write(plaintextBytes, 0, plaintextBytes.Length)
        encStream.FlushFinalBlock()

        ' Convert the encrypted stream to a printable string.
        Return Convert.ToBase64String(ms.ToArray)
    End Function

    Public Function DecryptData(ByVal encryptedtext As String) As String
        ' Convert the encrypted text string to a byte array.
        Dim encryptedBytes() As Byte = Convert.FromBase64String(encryptedtext)

        ' Create the stream.
        Dim ms As New System.IO.MemoryStream

        ' Create the decoder to write to the stream.
        Dim decStream As New CryptoStream(ms,
            TripleDes.CreateDecryptor(),
            System.Security.Cryptography.CryptoStreamMode.Write)

 
        ' Use the crypto stream to write the byte array to the stream.
        decStream.Write(encryptedBytes, 0, encryptedBytes.Length)
        decStream.FlushFinalBlock()

        ' Convert the plaintext stream to a string.
        Return System.Text.Encoding.Unicode.GetString(ms.ToArray)
    End Function
End Class

这是我使用不同填充和组合的方法：

from pyDes import *
import hashlib
import base64

key = b'Hi4Q=rLJnyqPj$G_cTqDcwgWo'
sha1_hash = hashlib.sha1(key).digest()

key_ = sha1_hash[:len(key)//8]
# key_ = sha1_hash[:-4]
# key_ = sha1_hash

base64Encrypted = r'''...'''
base64Decrypted = base64.b64decode(base64Encrypted)
print ("output: ", k.decrypt(base64Decrypted))

难道我做错了什么？

标签： pythonvb.netencryption3des