如何在C＃中使用公鑰和私鑰加密技術

Question

我想用公鑰/私鑰技術加密數據。我的意思是，使用接收方的公鑰進行加密，接收方可以使用自己的私鑰進行解密。

我該怎麼做？你有任何建議或示例代碼或其他東西？

Answer 1

代碼示例：

private static string _privateKey; 
private static string _publicKey; 
private static UnicodeEncoding _encoder = new UnicodeEncoding(); 

private static void RSA() 
{ 
    var rsa = new RSACryptoServiceProvider(); 
    _privateKey = rsa.ToXmlString(true); 
    _publicKey = rsa.ToXmlString(false); 

    var text = "Test1"; 
    Console.WriteLine("RSA // Text to encrypt: " + text); 
    var enc = Encrypt(text); 
    Console.WriteLine("RSA // Encrypted Text: " + enc); 
    var dec = Decrypt(enc); 
    Console.WriteLine("RSA // Decrypted Text: " + dec); 
} 

public static string Decrypt(string data) 
{ 
    var rsa = new RSACryptoServiceProvider(); 
    var dataArray = data.Split(new char[] { ',' }); 
    byte[] dataByte = new byte[dataArray.Length]; 
    for (int i = 0; i < dataArray.Length; i++) 
    { 
    dataByte[i] = Convert.ToByte(dataArray[i]); 
    } 

    rsa.FromXmlString(_privateKey); 
    var decryptedByte = rsa.Decrypt(dataByte, false); 
    return _encoder.GetString(decryptedByte); 
} 

public static string Encrypt(string data) 
{ 
    var rsa = new RSACryptoServiceProvider(); 
    rsa.FromXmlString(_publicKey); 
    var dataToEncrypt = _encoder.GetBytes(data); 
    var encryptedByteArray = rsa.Encrypt(dataToEncrypt, false).ToArray(); 
    var length = encryptedByteArray.Count(); 
    var item = 0; 
    var sb = new StringBuilder(); 
    foreach (var x in encryptedByteArray) 
    { 
    item++; 
    sb.Append(x); 

    if (item < length) 
     sb.Append(","); 
    } 

    return sb.ToString(); 
}