AES加密帮助类

AES加密帮助类

public class AesHelper
{
	// AES加密
	public static string EncryptStringToBase64(string plainText, string keyString)
	{
		// 将密钥字符串转换为字节数组
		byte[] keyBytes = Encoding.UTF8.GetBytes(keyString);

		// 创建AES对象
		using (Aes aesAlg = Aes.Create())
		{
			// 设置密钥大小（256位）
			aesAlg.KeySize = 256;
			aesAlg.Key = keyBytes;
			aesAlg.Mode = CipherMode.CBC;
			aesAlg.Padding = PaddingMode.PKCS7;

			// 生成初始化向量IV
			aesAlg.GenerateIV();

			// 创建加密器对象
			ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

			// 创建用于输出的内存流
			using (MemoryStream msEncrypt = new MemoryStream())
			{
				// 将IV添加到加密流的开始
				msEncrypt.Write(aesAlg.IV, 0, aesAlg.IV.Length);

				// 创建加密流
				using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
				{
					using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
					{
						// 将明文写入加密流
						swEncrypt.Write(plainText);
					}
				}

				// 获取加密后的字节数据
				byte[] encrypted = msEncrypt.ToArray();

				// 将加密后的字节数据转换为Base64字符串
				return Convert.ToBase64String(encrypted);
			}
		}
	}

	// AES解密
	public static string DecryptBase64ToString(string cipherTextBase64, string keyString)
	{
		// 将密钥字符串转换为字节数组
		byte[] keyBytes = Encoding.UTF8.GetBytes(keyString);

		// 将Base64字符串转换为字节数组
		byte[] cipherTextBytes = Convert.FromBase64String(cipherTextBase64);

		// 创建AES对象
		using (Aes aesAlg = Aes.Create())
		{
			aesAlg.KeySize = 256;
			aesAlg.Key = keyBytes;
			aesAlg.Mode = CipherMode.CBC;
			aesAlg.Padding = PaddingMode.PKCS7;

			// 从加密数据中提取IV
			byte[] iv = new byte[aesAlg.IV.Length];
			Array.Copy(cipherTextBytes, iv, iv.Length);
			aesAlg.IV = iv;

			// 创建解密器对象
			ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

			// 创建用于解密的内存流
			using (MemoryStream msDecrypt = new MemoryStream(cipherTextBytes, iv.Length, cipherTextBytes.Length - iv.Length))
			{
				// 创建解密流
				using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
				{
					using (StreamReader srDecrypt = new StreamReader(csDecrypt))
					{
						// 读取解密后的字符串
						return srDecrypt.ReadToEnd();
					}
				}
			}
		}
	}
}


class Program
{
	static void Main()
	{
		// 示例JSON字符串
		string jsonString = "{\"name\":\"John\", \"age\":30}";

		// 密钥（必须是32个字符，对应256位密钥大小）
		string key = "12345678901234567890123456789012";
		
		//加密后的字符串
		string encryptedBase64 = "";
		
		try
		{
			// 加密JSON字符串
			encryptedBase64 = AesHelper.EncryptStringToBase64(jsonString, key);

			// 输出加密后的Base64字符串
			Console.WriteLine("Encrypted (Base64): " + encryptedBase64);
		}
		catch (Exception e)
		{
			Console.WriteLine("An error occurred: " + e.Message);
		}

		try
		{
			// 解密Base64字符串
			string decryptedString = AesHelper.DecryptBase64ToString(encryptedBase64, key);

			// 输出解密后的字符串
			Console.WriteLine("Decrypted: " + decryptedString);
		}
		catch (Exception e)
		{
			Console.WriteLine("An error occurred: " + e.Message);
		}

	}
}