对称加密解密_AES

非对称加密使用一对秘钥，一个用来加密，一个用来解密，这样加密和解密花费时间就会更长长。

对称加密中加密方和解密方使用同一个密钥，加密解密的速度比较快，耗时短，适合数据比较长时的使用。

 public class AESHelper
    {
    
    

        /// <summary>
        /// 有密码的AES加密 
        /// </summary>
        /// <param name="toEncrypt">加密字符</param>
        /// <param name="key">秘钥</param>
        /// <returns></returns>
        public static string Encrypt(string toEncrypt, string key)
        {
    
    
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
            byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = CipherMode.ECB;
            rDel.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = rDel.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }

        /// <summary>
        /// AES解密
        /// </summary>
        /// <param name="toDecrypt"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string Decrypt(string toDecrypt, string key)
        {
    
    
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
            byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);

            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = CipherMode.ECB;
            rDel.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = rDel.CreateDecryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return UTF8Encoding.UTF8.GetString(resultArray);
        }
    }