using System;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Text;

namespace AESTool
{
    public class AES
    {
        private const string AES_IV = "0cAoMbN7xEM0uZVf";
        private const string AES_Key = "phMfB4YDfcgBRIXL";
        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="text"></param>
        /// <param name="key"></param>
        /// <param name="iv"></param>
        /// <returns></returns>
        public static string AESEncrypt(string text, string key = AES_Key, string iv = AES_IV)
        {
            RijndaelManaged rijndaelCipher = new RijndaelManaged();
            rijndaelCipher.Mode = CipherMode.CBC;
            rijndaelCipher.Padding = PaddingMode.PKCS7;
            rijndaelCipher.KeySize = 128;
            rijndaelCipher.BlockSize = 128;
            byte[] pwdBytes = Encoding.UTF8.GetBytes(key);
            byte[] keyBytes = new byte[32];
            int len = pwdBytes.Length;
            if (len > keyBytes.Length) len = keyBytes.Length;
            Array.Copy(pwdBytes, keyBytes, len);
            rijndaelCipher.Key = keyBytes;
            byte[] ivBytes = Encoding.UTF8.GetBytes(iv);
            rijndaelCipher.IV = ivBytes;
            ICryptoTransform transform = rijndaelCipher.CreateEncryptor();
            byte[] plainText = Encoding.UTF8.GetBytes(text);
            byte[] cipherBytes = transform.TransformFinalBlock(plainText, 0, plainText.Length);
            return Convert.ToBase64String(cipherBytes);
        }

        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="text"></param>
        /// <param name="key"></param>
        /// <param name="iv"></param>
        /// <returns></returns>
        public static string AESDecrypt(string text, string key = AES_Key, string iv = AES_IV)
        {
            RijndaelManaged rijndaelCipher = new RijndaelManaged();
            rijndaelCipher.Mode = CipherMode.CBC;
            rijndaelCipher.Padding = PaddingMode.PKCS7;
            rijndaelCipher.KeySize = 128;
            rijndaelCipher.BlockSize = 128;
            byte[] encryptedData = Convert.FromBase64String(text);
            byte[] pwdBytes = Encoding.UTF8.GetBytes(key);
            byte[] keyBytes = new byte[32];
            int len = pwdBytes.Length;
            if (len > keyBytes.Length) len = keyBytes.Length;
            Array.Copy(pwdBytes, keyBytes, len);
            rijndaelCipher.Key = keyBytes;
            byte[] ivBytes = Encoding.UTF8.GetBytes(iv);
            rijndaelCipher.IV = ivBytes;
            ICryptoTransform transform = rijndaelCipher.CreateDecryptor();
            byte[] plainText = transform.TransformFinalBlock(encryptedData, 0, encryptedData.Length);
            return Encoding.UTF8.GetString(plainText);
        }
    }
}