vbnet XTEA算法代码

以下是一个简单的VB.NET实现XTEA算法的代码示例：

Imports System.Text

Public Class XTEA
    Private Shared ReadOnly DELTA As UInteger = &H9E3779B9UI
    Private Shared ReadOnly NUM_ROUNDS As Integer = 32

    Public Shared Sub Encrypt(data() As Byte, key() As Byte)
        Dim v0 As UInteger = BitConverter.ToUInt32(data, 0)
        Dim v1 As UInteger = BitConverter.ToUInt32(data, 4)
        Dim sum As UInteger = 0

        For i As Integer = 0 To NUM_ROUNDS - 1
            v0 += ((v1 << 4) Xor (v1 >> 5)) + v1 Xor sum + key(sum And 3)
            sum += DELTA
            v1 += ((v0 << 4) Xor (v0 >> 5)) + v0 Xor sum + key((sum >> 11) And 3)
        Next

        BitConverter.GetBytes(v0).CopyTo(data, 0)
        BitConverter.GetBytes(v1).CopyTo(data, 4)
    End Sub

    Public Shared Sub Decrypt(data() As Byte, key() As Byte)
        Dim v0 As UInteger = BitConverter.ToUInt32(data, 0)
        Dim v1 As UInteger = BitConverter.ToUInt32(data, 4)
        Dim sum As UInteger = DELTA * NUM_ROUNDS

        For i As Integer = 0 To NUM_ROUNDS - 1
            v1 -= ((v0 << 4) Xor (v0 >> 5)) + v0 Xor sum + key((sum >> 11) And 3)
            sum -= DELTA
            v0 -= ((v1 << 4) Xor (v1 >> 5)) + v1 Xor sum + key(sum And 3)
        Next

        BitConverter.GetBytes(v0).CopyTo(data, 0)
        BitConverter.GetBytes(v1).CopyTo(data, 4)
    End Sub
End Class

使用示例：

Dim key As Byte() = Encoding.UTF8.GetBytes("mykey123")
Dim data As Byte() = Encoding.UTF8.GetBytes("Hello World!")

XTEA.Encrypt(data, key)

Dim encryptedText As String = Encoding.UTF8.GetString(data)
Console.WriteLine("Encrypted Text: " & encryptedText)

XTEA.Decrypt(data, key)

Dim decryptedText As String = Encoding.UTF8.GetString(data)
Console.WriteLine("Decrypted Text: " & decryptedText)

请注意，此代码仅提供了基本的XTEA算法实现。在实际应用中，您可能需要添加更多的错误检查和数据填充等功能