AES-128-CBC加密

C#:

 public static string AesKey = "sgg45747ss223455";

        /// <summary>
        /// AES加密 (128-CBC加密模式)
        /// </summary>
        /// <param name="toEncrypt">内容</param>
        /// <param name="key">秘钥</param>
        /// <returns></returns>

        public static string Encrypt(string toEncrypt, string key)
        {
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);

            byte[] ivArray = UTF8Encoding.UTF8.GetBytes(key);
            byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);
            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.IV = ivArray;
            rDel.Mode = CipherMode.CBC;
            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(128-CBC加密模式)
        /// </summary>
        /// <param name="toDecrypt">密文</param>
        /// <param name="key">秘钥(Base64String)</param>
        /// <returns></returns>
        public static string Decrypt(string toDecrypt, string key)
        {
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
            byte[] ivArray = UTF8Encoding.UTF8.GetBytes(key);

            byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);
            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.IV = ivArray;
            rDel.Mode = CipherMode.CBC;
            rDel.Padding = PaddingMode.PKCS7;
            ICryptoTransform cTransform = rDel.CreateDecryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            return UTF8Encoding.UTF8.GetString(resultArray);
        }

PHP