135 lines
4.5 KiB
C#
135 lines
4.5 KiB
C#
using System.Security.Cryptography;
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using System.Text;
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namespace IotManager.Common
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{
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public class Base64
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{
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public static void MainTest()
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{
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// 要加密的原始字符串
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string originalText = "Hello, World!";
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// 加密成Base64字符串
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string base64EncodedText = EncodeBase64(originalText);
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Console.WriteLine("Base64 编码结果: " + base64EncodedText);
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// 解密Base64字符串
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string decodedText = DecodeBase64(base64EncodedText);
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Console.WriteLine("Base64 解码结果: " + decodedText);
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}
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// 使用Base64编码字符串
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public static string EncodeBase64(string text)
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{
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byte[] bytesToEncode = Encoding.UTF8.GetBytes(text);
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string encodedText = Convert.ToBase64String(bytesToEncode);
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return encodedText;
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}
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// 使用Base64解码字符串
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public static string DecodeBase64(string encodedText)
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{
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byte[] decodedBytes = Convert.FromBase64String(encodedText);
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string decodedText = Encoding.UTF8.GetString(decodedBytes);
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return decodedText;
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}
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// 使用3DES-MAC签名消息
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public static string Sign3DESMAC(string key, string message)
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{
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byte[] keyBytes = Encoding.UTF8.GetBytes(key);
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byte[] messageBytes = Encoding.UTF8.GetBytes(message);
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using (TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider())
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{
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des.Key = keyBytes;
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des.Mode = CipherMode.ECB; // 3DES-MAC通常使用ECB模式
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des.Padding = PaddingMode.PKCS7; // PKCS7填充
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using (HMACMD5 hmac = new HMACMD5(des.Key))
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{
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byte[] hashBytes = hmac.ComputeHash(messageBytes);
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return BitConverter.ToString(hashBytes).Replace("-", "").ToLower();
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}
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}
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}
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// 验证3DES-MAC签名
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public static bool Verify3DESMAC(string key, string message, string macToVerify)
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{
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string calculatedMAC = Sign3DESMAC(key, message);
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return string.Equals(calculatedMAC, macToVerify, StringComparison.OrdinalIgnoreCase);
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}
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/// <summary>
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/// 取前16个字节
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/// </summary>
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/// <param name="message"></param>
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/// <param name="key"></param>
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/// <returns></returns>
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public static byte[] ComputeHMACSHA256Short(string message, string key)
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{
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using (HMACSHA256 hmac = new HMACSHA256(Encoding.UTF8.GetBytes(key)))
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{
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byte[] messageBytes = Encoding.UTF8.GetBytes(message);
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byte[] fullHash = hmac.ComputeHash(messageBytes);
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// 对完整哈希再做一次SHA256并取前16字节
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using (SHA256 sha = SHA256.Create())
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{
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byte[] rehashed = sha.ComputeHash(fullHash);
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byte[] result = new byte[16];
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Array.Copy(rehashed, result, 16);
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return result;
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}
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}
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}
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public static byte[] ComputeHMACSHA256(string message, string key)
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{
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using (HMACSHA256 hmac = new HMACSHA256(Encoding.UTF8.GetBytes(key)))
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{
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byte[] messageBytes = Encoding.UTF8.GetBytes(message);
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return hmac.ComputeHash(messageBytes);
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}
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}
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public static bool VerifyHMACSHA256(byte[] message, byte[] key, byte[] expectedMac)
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{
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using (HMACSHA256 hmac = new HMACSHA256(key))
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{
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byte[] computedMac = hmac.ComputeHash(message);
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return CryptographicOperations.FixedTimeEquals(computedMac, expectedMac); // 防止时间攻击
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}
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}
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static void Test()
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{
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string key = "ThisIsASecretKey"; // 密钥长度必须是24字节（192位）
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string message = "Hello, World!";
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// 使用3DES-MAC签名消息
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string mac = Sign3DESMAC(key, message);
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Console.WriteLine("3DES-MAC 签名: " + mac);
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// 验证3DES-MAC签名
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bool isVerified = Verify3DESMAC(key, message, mac);
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if (isVerified)
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{
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Console.WriteLine("消息验证成功！");
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}
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else
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{
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Console.WriteLine("消息验证失败！");
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}
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}
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}
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}
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