RSAEncryption.cs
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using NCC.Dependency;
using System;
using System.Security.Cryptography;
using System.Text;
namespace NCC.DataEncryption
{
/// <summary>
/// RSA 加密
/// </summary>
[SuppressSniffer]
public static class RSAEncryption
{
/// <summary>
/// 生成 RSA 秘钥
/// </summary>
/// <param name="keySize">大小必须为 2048 到 16384 之间，且必须能被 8 整除</param>
/// <returns></returns>
public static (string publicKey, string privateKey) GenerateSecretKey(int keySize = 2048)
{
CheckRSAKeySize(keySize);
using var rsa = new RSACryptoServiceProvider(keySize);
return (rsa.ToXmlString(false), rsa.ToXmlString(true));
}
/// <summary>
/// 加密
/// </summary>
/// <param name="text">明文内容</param>
/// <param name="publicKey">公钥</param>
/// <param name="keySize"></param>
/// <returns></returns>
public static string Encrypt(string text, string publicKey, int keySize = 2048)
{
CheckRSAKeySize(keySize);
using var rsa = new RSACryptoServiceProvider(keySize);
rsa.FromXmlString(publicKey);
var encryptedData = rsa.Encrypt(Encoding.Default.GetBytes(text), false);
return Convert.ToBase64String(encryptedData);
}
/// <summary>
/// 解密
/// </summary>
/// <param name="text">密文内容</param>
/// <param name="privateKey">私钥</param>
/// <param name="keySize"></param>
/// <returns></returns>
public static string Decrypt(string text, string privateKey, int keySize = 2048)
{
CheckRSAKeySize(keySize);
using var rsa = new RSACryptoServiceProvider(keySize);
rsa.FromXmlString(privateKey);
var decryptedData = rsa.Decrypt(Convert.FromBase64String(text), false);
return Encoding.Default.GetString(decryptedData);
}
/// <summary>
/// 检查 RSA 长度
/// </summary>
/// <param name="keySize"></param>
private static void CheckRSAKeySize(int keySize)
{
if (keySize < 2048 || keySize > 16384 || keySize % 8 != 0)
throw new ArgumentException("The keySize must be between 2048 and 16384 in size and must be divisible by 8.", nameof(keySize));
}
}
}