C# RSA Encryption: Code Guide

1 year ago
Benjamin Taylor
1 minute

In C#, the RSACryptoServiceProvider class can be used to perform RSA encryption and decryption.

Firstly, you need to generate an RSA key pair. Here is an example:

using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
    // 生成密钥对
    RSAParameters publicKey = rsa.ExportParameters(false); // 获取公钥
    RSAParameters privateKey = rsa.ExportParameters(true); // 获取私钥

    // TODO: 将公钥和私钥保存到安全地方
}

Next, you can use the generated public key for encryption and the private key for decryption. Here is an example:

using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
    // 导入私钥
    rsa.ImportParameters(privateKey);

    // 加密数据
    byte[] dataToEncrypt = Encoding.UTF8.GetBytes("Hello World");
    byte[] encryptedData = rsa.Encrypt(dataToEncrypt, true);
    
    // 使用公钥解密
    rsa.ImportParameters(publicKey);
    byte[] decryptedData = rsa.Decrypt(encryptedData, true);

    // 输出解密后的数据
    string decryptedText = Encoding.UTF8.GetString(decryptedData);
    Console.WriteLine(decryptedText);
}

Please note, this is just a simple example. In practice, you may need to handle the storage and management of keys, as well as be aware of size limitations when encrypting data.

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