135 lines
4.7 KiB
VB.net
135 lines
4.7 KiB
VB.net
#Region "Microsoft.VisualBasic::d65684dc5d5f8fecadfeac41e2e710a2, Microsoft.VisualBasic.Core\Extensions\Security\TripleDES.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Class TripleDES
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'
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' Constructor: (+2 Overloads) Sub New
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' Function: Decrypt, DecryptString, Encrypt, EncryptData, InternalCryptoTransform
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' ToString
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'
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'
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' /********************************************************************************/
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#End Region
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Imports System.IO
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Imports System.Text
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Imports System.Security.Cryptography
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Namespace SecurityString
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Public Class TripleDES : Inherits SecurityString.SecurityStringModel
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Private ReadOnly _des As New TripleDESCryptoServiceProvider
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Private ReadOnly _uni As New UnicodeEncoding
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Private ReadOnly _key() As Byte
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Private ReadOnly _iv() As Byte
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''' <summary>
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'''
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''' </summary>
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''' <param name="key">24byte</param>
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''' <param name="iv">8byte</param>
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''' <remarks></remarks>
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Public Sub New(key() As Byte, iv() As Byte)
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_key = key
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_iv = iv
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End Sub
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Sub New(Optional password As String = "")
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If Not String.IsNullOrEmpty(password) Then
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strPassphrase = password
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End If
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Dim md5 = SecurityString.GetMd5Hash(strPassphrase)
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md5 = md5 & md5 & md5 & md5
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Dim bytes = _uni.GetBytes(md5)
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If bytes.Length < 24 Then
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bytes = {bytes, New Byte() {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24}}.ToVector
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End If
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_key = bytes.Take(24).ToArray
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Dim n As Integer = bytes.Length / 3
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_iv = _key.Take(8).Reverse.ToArray
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End Sub
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Public Overrides Function ToString() As String
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Return strPassphrase
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End Function
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Public Overrides Function Encrypt(input() As Byte) As Byte()
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Return InternalCryptoTransform(input, _des.CreateEncryptor(_key, _iv))
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End Function
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Public Overrides Function EncryptData(text As String) As String
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Dim input() = _uni.GetBytes(text)
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Dim output() = InternalCryptoTransform(input, _des.CreateEncryptor(_key, _iv))
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Return Convert.ToBase64String(output)
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End Function
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Public Overrides Function Decrypt(input() As Byte) As Byte()
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Return InternalCryptoTransform(input, _des.CreateDecryptor(_key, _iv))
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End Function
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Public Overrides Function DecryptString(text As String) As String
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Dim input() = Convert.FromBase64String(text)
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Dim output() = InternalCryptoTransform(input, _des.CreateDecryptor(_key, _iv))
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Return _uni.GetString(output)
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End Function
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Private Function InternalCryptoTransform(input() As Byte, transform As ICryptoTransform) As Byte()
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Dim result As Byte() = Nothing
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Using ms As New MemoryStream
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Using cs As New CryptoStream(ms, transform, CryptoStreamMode.Write)
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cs.Write(input, 0, input.Length)
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Try
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cs.FlushFinalBlock()
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Catch ex As Exception
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Call Console.WriteLine(ex.ToString)
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End Try
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ms.Position = 0
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Try
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result = ms.ToArray()
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Catch ex As Exception
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Call Console.WriteLine(ex.ToString)
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End Try
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End Using
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End Using
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Return result
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End Function
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End Class
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End Namespace
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