Question

任何人都可以给我一个使用.net和asp.net加密和解密图像的例子

当我将它作为二进制数据保存到sql server中时，我希望对图像进行加密。

Answer 1

包含这些名称空间

using System.IO;
using System.Security.Cryptography;

对于加密创建以下功能：

private void EncryptFile(string inputFile, string outputFile)
{

    try
    {
        string password = @"myKey123"; // Your Key Here
        UnicodeEncoding UE = new UnicodeEncoding();
        byte[] key = UE.GetBytes(password);

        string cryptFile = outputFile;
        FileStream fsCrypt = new FileStream(cryptFile, FileMode.Create);

        RijndaelManaged RMCrypto = new RijndaelManaged();

        CryptoStream cs = new CryptoStream(fsCrypt,
            RMCrypto.CreateEncryptor(key, key),
            CryptoStreamMode.Write);

        FileStream fsIn = new FileStream(inputFile, FileMode.Open);

        int data;
        while ((data = fsIn.ReadByte()) != -1)
            cs.WriteByte((byte)data);


        fsIn.Close();
        cs.Close();
        fsCrypt.Close();
    }
    catch
    {
        MessageBox.Show("Encryption failed!", "Error");
    }
}

对于解密创建以下功能：

private void DecryptFile(string inputFile, string outputFile)
{

    {
        string password = @"myKey123"; // Your Key Here

        UnicodeEncoding UE = new UnicodeEncoding();
        byte[] key = UE.GetBytes(password);

        FileStream fsCrypt = new FileStream(inputFile, FileMode.Open);

        RijndaelManaged RMCrypto = new RijndaelManaged();

        CryptoStream cs = new CryptoStream(fsCrypt,
            RMCrypto.CreateDecryptor(key, key),
            CryptoStreamMode.Read);

        FileStream fsOut = new FileStream(outputFile, FileMode.Create);

        int data;
        while ((data = cs.ReadByte()) != -1)
            fsOut.WriteByte((byte)data);

        fsOut.Close();
        cs.Close();
        fsCrypt.Close();

    }
}

你可以像这样打电话

   EncryptFile(@"D:\OriginalImage.png", @"D:\VizioEncrypted.png"); //To Encrypt

   DecryptFile(@"D:\VizioEncrypted.png", @"D:\VizioDecrypted.png"); //To Decrypt

这将有助于

Answer 2

最后我找到了解决这个问题的方法。我将添加代码以帮助那些需要它的人。

加密方法：

    Public Function EncryptStream(ByVal input As Byte()) As Byte()
    Dim rijn As New RijndaelManaged()
    Dim encrypted As Byte()
    Dim key As Byte() = New Byte() {&H22, &HC0, &H6D, &HCB, &H23, &HA6, _
     &H3, &H1B, &H5A, &H1D, &HD3, &H9F, _
     &H85, &HD, &HC1, &H72, &HED, &HF4, _
     &H54, &HE6, &HBA, &H65, &HC, &H22, _
     &H62, &HBE, &HF3, &HEC, &H14, &H81, _
     &HA8, &HA}
    '32
    Dim IV As Byte() = New Byte() {&H43, &HB1, &H93, &HB, &H1A, &H87, _
     &H52, &H62, &HFB, &H8, &HD, &HC0, _
     &HCA, &H40, &HC2, &HDB}
    '16
    'Get an encryptor.
    Dim encryptor As ICryptoTransform = rijn.CreateEncryptor(key, IV)

    'Encrypt the data.
    Dim msEncrypt As New MemoryStream()
    Dim csEncrypt As New CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)


    'Write all data to the crypto stream and flush it.
    csEncrypt.Write(input, 0, input.Length)
    csEncrypt.FlushFinalBlock()

    'Get encrypted array of bytes.
    encrypted = msEncrypt.ToArray()

    Return encrypted

End Function

解密方法：

    Public Function DecryptStream(ByVal input As Byte()) As Byte()
    Dim rijn As New RijndaelManaged()
    Dim decrypted As Byte()
    Dim key As Byte() = New Byte() {&H22, &HC0, &H6D, &HCB, &H23, &HA6, _
     &H3, &H1B, &H5A, &H1D, &HD3, &H9F, _
     &H85, &HD, &HC1, &H72, &HED, &HF4, _
     &H54, &HE6, &HBA, &H65, &HC, &H22, _
     &H62, &HBE, &HF3, &HEC, &H14, &H81, _
     &HA8, &HA}
    '32
    Dim IV As Byte() = New Byte() {&H43, &HB1, &H93, &HB, &H1A, &H87, _
     &H52, &H62, &HFB, &H8, &HD, &HC0, _
     &HCA, &H40, &HC2, &HDB}
    '16 


    'Get a decryptor that uses the same key and IV as the encryptor.
    Dim decryptor As ICryptoTransform = rijn.CreateDecryptor(key, IV)

    'Now decrypt the previously encrypted message using the decryptor
    ' obtained in the above step.
    Dim msDecrypt As New MemoryStream(input)
    Dim csDecrypt As New CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)

    decrypted = New Byte(input.Length - 1) {}

    'Read the data out of the crypto stream.
    csDecrypt.Read(decrypted, 0, decrypted.Length)

    Return decrypted
End Function

加密和解密图像.net

2 个答案: