请问如何从CryptoStream返回解码字节而不是文本 [英] Please how can i return decoded bytes instead of text from a CryptoStream

问题描述

请问如何在以下代码段中返回解码的字节而不是文本：

 公共共享函数decryptAsText（key As Byte（），密文As Byte（），as Aste（））As String 
 Dim dec As String = Nothing 
尝试
使用rj = New Security.Cryptography.Rijndael使用{.Key = key，.IV = iv，.Mode = Security.Cryptography.CipherMode.CBC，.Padding = PaddingMode.PKCS7} 
使用ms =新建IO.MemoryStream（ciphertext）
使用cs =新的安全性。 Cryptography.CryptoStream（ms，rj.CreateDecryptor（key，iv），Security.Cryptography.CryptoStreamMode.Read）
使用sr =新建IO.StreamReader（cs）
 dec = sr.ReadToEnd 
结束使用
结束使用
结束使用
结束使用
 Catch e作为异常
结束尝试
 
返回dec 
结束函数
  

我的尝试以下失败

 公共共享函数decryptAsBytes（密钥As Byte（），密文as Byte（），iv As Byte（））As Byte（）
尝试
使用rj = New Security.Cryptography.RijndaelManaged with {.Key = key，.IV = iv，.Mode = Security.Cryptography.CipherMode.CBC，.Padding = PaddingMode.PKCS7 } 
使用ms = New IO.MemoryStream（ciphertext）
使用cs = New Security.Cryptography.CryptoStream（ms，rj.CreateDecryptor（key，iv），Security.Cryptography.CryptoStreamMode.Read）
 Dim l As Integer = CInt（cs.Length）
 Dim b（l  -  1）As Byte 
 cs.Read（b，0，l）
返回b 
结束使用
结束使用
结束使用
捕获e作为异常
结束尝试
返回{} 
结束功能
  

解决方案尝试
使用rj = New Security.Cryptography.RijndaelManaged with {.Key = key，.IV = iv，.Mode = Security.Cryptography.CipherMode。 CBC，.Padding = PaddingMode.PKCS7}
使用ms =新的IO.MemoryStream（ciphertext）
使用cs =新的Security.Cryptography.CryptoStream（ms，rj.CreateDecryptor（key，iv），安全性。 Cryptography.CryptoStreamMode.Read）
使用ds =新建IO.MemoryStream（）
cs.CopyTo（ds）
返回ds.ToArray
结束使用
结束使用
结束使用
结束使用
捕获e作为异常
结束尝试
返回{}
结束函数
/ pre>

Please how can i return the decoded bytes instead of text in the following snippet:

Public Shared Function decryptAsText(key As Byte(), ciphertext As Byte(), iv As Byte()) As String
    Dim dec As String = Nothing
    Try
        Using rj = New Security.Cryptography.RijndaelManaged With {.Key = key, .IV = iv, .Mode = Security.Cryptography.CipherMode.CBC, .Padding = PaddingMode.PKCS7}
            Using ms = New IO.MemoryStream(ciphertext)
                Using cs = New Security.Cryptography.CryptoStream(ms, rj.CreateDecryptor(key, iv), Security.Cryptography.CryptoStreamMode.Read)
                    Using sr = New IO.StreamReader(cs)
                        dec = sr.ReadToEnd
                    End Using
                End Using
            End Using
        End Using
    Catch e As Exception
    End Try

    Return dec
End Function

My attempt below fails

 Public Shared Function decryptAsBytes(key As Byte(), ciphertext As Byte(), iv As Byte()) As Byte()
        Try
            Using rj = New Security.Cryptography.RijndaelManaged With {.Key = key, .IV = iv, .Mode = Security.Cryptography.CipherMode.CBC, .Padding = PaddingMode.PKCS7}
                Using ms = New IO.MemoryStream(ciphertext)
                    Using cs = New Security.Cryptography.CryptoStream(ms, rj.CreateDecryptor(key, iv), Security.Cryptography.CryptoStreamMode.Read)
                        Dim l As Integer = CInt(cs.Length)
                        Dim b(l - 1) As Byte
                        cs.Read(b, 0, l)
                        Return b
                    End Using
                End Using
            End Using
        Catch e As Exception
        End Try
        Return {}
    End Function

解决方案

Finally got this to work

Public Shared Function decryptAsBytes(key As Byte(), ciphertext As Byte(), iv As Byte()) As Byte()
    Try
        Using rj = New Security.Cryptography.RijndaelManaged With {.Key = key, .IV = iv, .Mode = Security.Cryptography.CipherMode.CBC, .Padding = PaddingMode.PKCS7}
            Using ms = New IO.MemoryStream(ciphertext)
                Using cs = New Security.Cryptography.CryptoStream(ms, rj.CreateDecryptor(key, iv), Security.Cryptography.CryptoStreamMode.Read)
                    Using ds = New IO.MemoryStream()
                        cs.CopyTo(ds)
                        Return ds.ToArray
                    End Using
                End Using
            End Using
        End Using
    Catch e As Exception
    End Try
    Return {}
End Function

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