在C#中实现SM4加密可以通过使用第三方库来实现。一个常用的库是Bouncy Castle,可以通过NuGet安装。
首先,安装Bouncy Castle库:
Install-Package BouncyCastle
然后,使用以下代码示例实现SM4加密:
using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto.Engines;
public class SM4Encryption
{
public static string Encrypt(string plaintext, string key)
{
byte[] keyBytes = Encoding.UTF8.GetBytes(key);
byte[] plaintextBytes = Encoding.UTF8.GetBytes(plaintext);
SM4Engine sm4 = new SM4Engine();
KeyParameter keyParam = new KeyParameter(keyBytes);
sm4.Init(true, keyParam);
byte[] ciphertextBytes = new byte[plaintextBytes.Length];
for (int i = 0; i < plaintextBytes.Length; i++)
{
sm4.ProcessBlock(plaintextBytes, i, ciphertextBytes, i);
}
return Convert.ToBase64String(ciphertextBytes);
}
public static string Decrypt(string ciphertext, string key)
{
byte[] keyBytes = Encoding.UTF8.GetBytes(key);
byte[] ciphertextBytes = Convert.FromBase64String(ciphertext);
SM4Engine sm4 = new SM4Engine();
KeyParameter keyParam = new KeyParameter(keyBytes);
sm4.Init(false, keyParam);
byte[] plaintextBytes = new byte[ciphertextBytes.Length];
for (int i = 0; i < ciphertextBytes.Length; i++)
{
sm4.ProcessBlock(ciphertextBytes, i, plaintextBytes, i);
}
return Encoding.UTF8.GetString(plaintextBytes);
}
}
使用示例:
string plaintext = "Hello, SM4!";
string key = "0123456789abcdeffedcba9876543210";
string ciphertext = SM4Encryption.Encrypt(plaintext, key);
Console.WriteLine("Ciphertext: " + ciphertext);
string decryptedText = SM4Encryption.Decrypt(ciphertext, key);
Console.WriteLine("Decrypted Text: " + decryptedText);
请注意,以上代码示例仅供参考,并不保证在所有情况下都能正确工作。在实际应用中,建议根据具体需求进行适当调整和优化。
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