C#加密：AES加密

/// <summary>
/// .NET AES加密解密帮助类
/// </summary>
public class CryptoAESHelper
{
    /// <summary>
    /// Aes加解密钥必须32位
    /// </summary>
    public static string AesKey = "asekey32w";
    /// <summary>
    /// 获取Aes32位密钥
    /// </summary>
    /// <param name="key">Aes密钥字符串</param>
    /// <returns>Aes32位密钥</returns>
    static byte[] GetAesKey(string key)
    {
        if (string.IsNullOrEmpty(key))
        {
            throw new ArgumentNullException("key", "Aes密钥不能为空");
        }
        if (key.Length < 32)
        {
            // 不足32补全
            key = key.PadRight(32, '0');
        }
        if (key.Length > 32)
        {
            key = key.Substring(0, 32);
        }
        return Encoding.UTF8.GetBytes(key);
    }
    /// <summary>
    /// Aes加密
    /// </summary>
    /// <param name="source">源字符串</param>
    /// <param name="key">aes密钥，长度必须32位</param>
    /// <returns>加密后的字符串</returns>
    public static string EncryptAes(string source, string key)
    {
        using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider())
        {
            aesProvider.Key = GetAesKey(key);
            aesProvider.Mode = CipherMode.ECB;
            aesProvider.Padding = PaddingMode.PKCS7;
            using (ICryptoTransform cryptoTransform = aesProvider.CreateEncryptor())
            {
                byte[] inputBuffers = Encoding.UTF8.GetBytes(source);
                byte[] results = cryptoTransform.TransformFinalBlock(inputBuffers, 0, inputBuffers.Length);
                aesProvider.Clear();
                aesProvider.Dispose();
                return Convert.ToBase64String(results, 0, results.Length);
            }
        }
    }
    /// <summary>
    /// Aes解密
    /// </summary>
    /// <param name="source">源字符串</param>
    /// <param name="key">aes密钥，长度必须32位</param>
    /// <returns>解密后的字符串</returns>
    public static string DecryptAes(string source, string key)
    {
        using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider())
        {
            aesProvider.Key = GetAesKey(key);
            aesProvider.Mode = CipherMode.ECB;
            aesProvider.Padding = PaddingMode.PKCS7;
            using (ICryptoTransform cryptoTransform = aesProvider.CreateDecryptor())
            {
                byte[] inputBuffers = Convert.FromBase64String(source);
                byte[] results = cryptoTransform.TransformFinalBlock(inputBuffers, 0, inputBuffers.Length);
                aesProvider.Clear();
                return Encoding.UTF8.GetString(results);
            }
        }
    }

}