SQL2005中部署.net 3DES加密函數

2024-07-21 02:31:35

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來源：轉載

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SQL2005支持在SQL SERVER里部署.net應用程序了，那么以前一直寫在.net里的一些運算如加密等已經完全可以移到sql里來進行了，而不需要再從程序中運算了，使數據庫可以和程序相對獨立開來，方便了不少。
前陣子，需要給數據加密，所以寫了個3DES加密函數部署到SQL2005中，當然,現在秘鑰也作為一個表存在在數據庫中,至于這個密鑰,以后可以考慮用usb-key使用rsa加密或者別的方式進行加密,以保證數據安全。現在先說怎么實現部署到sqlserver中的加密函數吧。
新建一個項目。VB中的database-->SQL Server PRoject，我新建了以后叫做DESCryptoService的項目，之后，會讓你添加數據庫引用，選擇你要部署到的數據庫。
寫入如下代碼，就OK了

Imports System
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.SqlTypes
Imports Microsoft.SqlServer.Server
Imports System.IO
Imports System.xml
Imports System.Text
Imports System.Security.Cryptography

Partial Public Class EncryptToBase64DecryptFromBase64Class EncryptToBase64DecryptFromBase64

    <Microsoft.SqlServer.Server.SqlFunction()> _
    Public Shared Function EncryptToBase64String()Function EncryptToBase64String(ByVal stringToEncryptsql As SqlString, ByVal SEncryptionKeysql As SqlString) As SqlString
        Dim stringToEncrypt As String = CType(stringToEncryptsql, String)
        Dim SEncryptionKey As String = CType(SEncryptionKeysql, String)
        Dim IV() As Byte = {&H12, &H34, &H56, &H78, &H90, &HAB, &HCD, &HEF}
        Dim key() As Byte = {}
        Try
            key = System.Text.Encoding.UTF8.GetBytes(Left(SEncryptionKey, 8))
            Dim des As New DESCryptoServiceProvider()
            Dim inputByteArray() As Byte = Encoding.UTF8.GetBytes(stringToEncrypt)
            Dim ms As New MemoryStream()
            Dim cs As New CryptoStream(ms, des.CreateEncryptor(key, IV), CryptoStreamMode.Write)
            cs.Write(inputByteArray, 0, inputByteArray.Length)
            cs.FlushFinalBlock()
            Return Convert.ToBase64String(ms.ToArray())
        Catch e As Exception
            Return CType(e.Message, SqlString)
        End Try
    End Function

    <Microsoft.SqlServer.Server.SqlFunction()> _
        Public Shared Function DecryptFromBase64String()Function DecryptFromBase64String(ByVal stringToDecryptsql As SqlString, ByVal sEncryptionKeysql As SqlString) As SqlString
        Dim stringToDecrypt As String = CType(stringToDecryptsql, String)
        Dim sEncryptionKey As String = CType(sEncryptionKeysql, String)
        Dim inputByteArray(stringToDecrypt.Length) As Byte
        Dim IV() As Byte = {&H12, &H34, &H56, &H78, &H90, &HAB, &HCD, &HEF}
        Dim key() As Byte = {}
        Try
            key = System.Text.Encoding.UTF8.GetBytes(Left(sEncryptionKey, 8))
            Dim des As New DESCryptoServiceProvider()
            inputByteArray = Convert.FromBase64String(stringToDecrypt)
            Dim ms As New MemoryStream()
            Dim cs As New CryptoStream(ms, des.CreateDecryptor(key, IV), CryptoStreamMode.Write)
            cs.Write(inputByteArray, 0, inputByteArray.Length)
            cs.FlushFinalBlock()
            Dim encoding As System.Text.Encoding = System.Text.Encoding.UTF8
            Return encoding.GetString(ms.ToArray())
        Catch e As Exception
            Return CType(e.Message, SqlString)
        End Try
    End Function