可直接在控制台程序运行:
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
public class AesEncryptionDemo
{
public static byte[] Encrypt(string plainText, byte[] key, byte[] iv)
{
using (Aes aes = Aes.Create())
{
aes.Key = key;
aes.IV = iv;
ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
{
byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);
cryptoStream.Write(plainBytes, 0, plainBytes.Length);
cryptoStream.FlushFinalBlock();
return memoryStream.ToArray();
}
}
}
}
public static string Decrypt(byte[] cipherText, byte[] key, byte[] iv)
{
using (Aes aes = Aes.Create())
{
aes.Key = key;
aes.IV = iv;
ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
using (MemoryStream memoryStream = new MemoryStream(cipherText))
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
{
byte[] plainBytes = new byte[cipherText.Length];
int decryptedByteCount = cryptoStream.Read(plainBytes, 0, plainBytes.Length);
return Encoding.UTF8.GetString(plainBytes, 0, decryptedByteCount);
}
}
}
}
public static void Main()
{
string plainText = "123456";
byte[] key = new byte[32]; // AES-256 使用 32 字节的密钥
byte[] iv = new byte[16]; // AES 使用 16 字节的初始向量
// 生成随机的密钥和初始向量key iv
using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
{
rng.GetBytes(key);
rng.GetBytes(iv);
}
string ivHex = BitConverter.ToString(iv).Replace("-", "").ToLower();//将密钥和初始向量转化为字符串存入数据库
string keyHex = BitConverter.ToString(key).Replace("-", "").ToLower();
byte[] ivHexs = Enumerable.Range(0, ivHex.Length)//将数据库密钥和初始向量字符串取出并转化为字节形式
.Where(x => x % 2 == 0)
.Select(x => Convert.ToByte(ivHex.Substring(x, 2), 16))
.ToArray();
byte[] keyHexs = Enumerable.Range(0, keyHex.Length)
.Where(x => x % 2 == 0)
.Select(x => Convert.ToByte(keyHex.Substring(x, 2), 16))
.ToArray();
byte[] cipherText = Encrypt(plainText, key, iv);//明文=》密文,其中key和iv为随机生成的密钥和初始向量(字节)
string decryptedText = Decrypt(cipherText, key, iv);//密文=》明文,其中key和iv为随机生成的密钥和初始向量(字节)
Console.WriteLine("Plain Text: " + plainText);// 明文
Console.WriteLine("Cipher Text: " + Convert.ToBase64String(cipherText));//密文
Console.WriteLine("Decrypted Text: " + decryptedText);//解密后的明文
}
}