How to Encrypt and Decrypt Strings in C# Using RijndaelManaged?

In C#, use the Rijndaelmanaged algorithm encryption and unclean string detailed explanation

This article will introduce in detail how to use the Rijndaelmanaged algorithm in C#to encrypt and decrypt the string.

The encryption process

First of all, you need to introduce

Naming space. The following code fragment demonstrates how to use the Rijndaelmanaged algorithm plus a complicated string:

System.Security.Cryptography

The decryption process

<code class="language-csharp">using System.Security.Cryptography;

public class Encryption
{
    // 使用RijndaelManaged算法加密字符串
    public string EncryptString(string plainText, string sharedSecret)
    {
        // 从共享密钥和salt生成密钥
        Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(sharedSecret, _salt);

        // 创建RijndaelManaged对象
        RijndaelManaged aesAlg = new RijndaelManaged();
        aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8);

        // 创建加密器
        ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

        // 创建内存流来保存加密数据
        using (MemoryStream msEncrypt = new MemoryStream())
        {
            // 将IV写入流
            msEncrypt.Write(BitConverter.GetBytes(aesAlg.IV.Length), 0, sizeof(int));
            msEncrypt.Write(aesAlg.IV, 0, aesAlg.IV.Length);

            // 加密数据
            using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
            {
                using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                {
                    swEncrypt.Write(plainText);
                }
            }

            // 将加密数据转换为base64字符串
            return Convert.ToBase64String(msEncrypt.ToArray());
        }
    }
}</code>

Decrypting and encryption string needs to use the same shared key as when encrypted. The following code fragment demonstrates how to use the same Rijndaelmanaged algorithm string:

Please note that It needs to be defined as a Byte array in the code for enhanced security. The complete code also needs to contain the implementation of the

method. This method read the byte array from

<code class="language-csharp">public string DecryptString(string cipherText, string sharedSecret)
{
    // 从共享密钥和salt生成密钥
    Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(sharedSecret, _salt);

    // 创建RijndaelManaged对象
    RijndaelManaged aesAlg = new RijndaelManaged();
    aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8);

    // 将密文从base64字符串转换
    byte[] bytes = Convert.FromBase64String(cipherText);

    // 创建内存流来保存解密数据
    using (MemoryStream msDecrypt = new MemoryStream(bytes))
    {
        // 从流中获取IV
        aesAlg.IV = ReadByteArray(msDecrypt);

        // 创建解密器
        ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

        // 解密数据
        using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
        {
            using (StreamReader srDecrypt = new StreamReader(csDecrypt))
            {
                // 从流中读取解密数据
                return srDecrypt.ReadToEnd();
            }
        }
    }
}</code>

. Remember, choosing a strong sharing key is essential for security.

The above is the detailed content of How to Encrypt and Decrypt Strings in C# Using RijndaelManaged?. For more information, please follow other related articles on the PHP Chinese website!